Merge branch 'feature/linenoise-ng' of git://github.com/dtzWill/nix

10 files changed, 4580 insertions, 1262 deletions

diff --git a/doc/manual/introduction/about-nix.xml b/doc/manual/introduction/about-nix.xml
index 7cb124033..83a2b6786 100644
--- a/doc/manual/introduction/about-nix.xml
+++ b/doc/manual/introduction/about-nix.xml
@@ -262,7 +262,7 @@ xlink:href="http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html">GNU
 LGPLv2.1 or (at your option) any later version</link>.</para>
 
 <para>Nix uses the <link
-xlink:href="https://github.com/antirez/linenoise">linenoise
+xlink:href="https://github.com/arangodb/linenoise-ng">linenoise-ng
 library</link>, which has the following license:</para>
 
 <programlisting><xi:include href="../../../src/linenoise/LICENSE" parse="text" /></programlisting>
diff --git a/src/linenoise/ConvertUTF.cpp b/src/linenoise/ConvertUTF.cpp
new file mode 100644
index 000000000..f7e5915d5
--- /dev/null
+++ b/src/linenoise/ConvertUTF.cpp
@@ -0,0 +1,542 @@
+/*
+ * Copyright 2001-2004 Unicode, Inc.
+ * 
+ * Disclaimer
+ * 
+ * This source code is provided as is by Unicode, Inc. No claims are
+ * made as to fitness for any particular purpose. No warranties of any
+ * kind are expressed or implied. The recipient agrees to determine
+ * applicability of information provided. If this file has been
+ * purchased on magnetic or optical media from Unicode, Inc., the
+ * sole remedy for any claim will be exchange of defective media
+ * within 90 days of receipt.
+ * 
+ * Limitations on Rights to Redistribute This Code
+ * 
+ * Unicode, Inc. hereby grants the right to freely use the information
+ * supplied in this file in the creation of products supporting the
+ * Unicode Standard, and to make copies of this file in any form
+ * for internal or external distribution as long as this notice
+ * remains attached.
+ */
+
+/* ---------------------------------------------------------------------
+
+    Conversions between UTF32, UTF-16, and UTF-8. Source code file.
+    Author: Mark E. Davis, 1994.
+    Rev History: Rick McGowan, fixes & updates May 2001.
+    Sept 2001: fixed const & error conditions per
+        mods suggested by S. Parent & A. Lillich.
+    June 2002: Tim Dodd added detection and handling of incomplete
+        source sequences, enhanced error detection, added casts
+        to eliminate compiler warnings.
+    July 2003: slight mods to back out aggressive FFFE detection.
+    Jan 2004: updated switches in from-UTF8 conversions.
+    Oct 2004: updated to use UNI_MAX_LEGAL_UTF32 in UTF-32 conversions.
+
+    See the header file "ConvertUTF.h" for complete documentation.
+
+------------------------------------------------------------------------ */
+
+#include "ConvertUTF.h"
+#ifdef CVTUTF_DEBUG
+#include <stdio.h>
+#endif
+
+namespace linenoise_ng {
+
+static const int halfShift  = 10; /* used for shifting by 10 bits */
+
+static const UTF32 halfBase = 0x0010000UL;
+static const UTF32 halfMask = 0x3FFUL;
+
+#define UNI_SUR_HIGH_START  (UTF32)0xD800
+#define UNI_SUR_HIGH_END    (UTF32)0xDBFF
+#define UNI_SUR_LOW_START   (UTF32)0xDC00
+#define UNI_SUR_LOW_END     (UTF32)0xDFFF
+#define false      0
+#define true        1
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF32toUTF16 (
+        const UTF32** sourceStart, const UTF32* sourceEnd, 
+        char16_t** targetStart, char16_t* targetEnd, ConversionFlags flags) {
+    ConversionResult result = conversionOK;
+    const UTF32* source = *sourceStart;
+    char16_t* target = *targetStart;
+    while (source < sourceEnd) {
+        UTF32 ch;
+        if (target >= targetEnd) {
+            result = targetExhausted; break;
+        }
+        ch = *source++;
+        if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
+            /* UTF-16 surrogate values are illegal in UTF-32; 0xffff or 0xfffe are both reserved values */
+            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+                if (flags == strictConversion) {
+                    --source; /* return to the illegal value itself */
+                    result = sourceIllegal;
+                    break;
+                } else {
+                    *target++ = UNI_REPLACEMENT_CHAR;
+                }
+            } else {
+                *target++ = (UTF16)ch; /* normal case */
+            }
+        } else if (ch > UNI_MAX_LEGAL_UTF32) {
+            if (flags == strictConversion) {
+                result = sourceIllegal;
+            } else {
+                *target++ = UNI_REPLACEMENT_CHAR;
+            }
+        } else {
+            /* target is a character in range 0xFFFF - 0x10FFFF. */
+            if (target + 1 >= targetEnd) {
+                --source; /* Back up source pointer! */
+                result = targetExhausted; break;
+            }
+            ch -= halfBase;
+            *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
+            *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
+        }
+    }
+    *sourceStart = source;
+    *targetStart = target;
+    return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF16toUTF32 (
+        const UTF16** sourceStart, const UTF16* sourceEnd, 
+        UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
+    ConversionResult result = conversionOK;
+    const UTF16* source = *sourceStart;
+    UTF32* target = *targetStart;
+    UTF32 ch, ch2;
+    while (source < sourceEnd) {
+        const UTF16* oldSource = source; /*  In case we have to back up because of target overflow. */
+        ch = *source++;
+        /* If we have a surrogate pair, convert to UTF32 first. */
+        if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
+            /* If the 16 bits following the high surrogate are in the source buffer... */
+            if (source < sourceEnd) {
+                ch2 = *source;
+                /* If it's a low surrogate, convert to UTF32. */
+                if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
+                    ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
+                        + (ch2 - UNI_SUR_LOW_START) + halfBase;
+                    ++source;
+                } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
+                    --source; /* return to the illegal value itself */
+                    result = sourceIllegal;
+                    break;
+                }
+            } else { /* We don't have the 16 bits following the high surrogate. */
+                --source; /* return to the high surrogate */
+                result = sourceExhausted;
+                break;
+            }
+        } else if (flags == strictConversion) {
+            /* UTF-16 surrogate values are illegal in UTF-32 */
+            if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
+                --source; /* return to the illegal value itself */
+                result = sourceIllegal;
+                break;
+            }
+        }
+        if (target >= targetEnd) {
+            source = oldSource; /* Back up source pointer! */
+            result = targetExhausted; break;
+        }
+        *target++ = ch;
+    }
+    *sourceStart = source;
+    *targetStart = target;
+#ifdef CVTUTF_DEBUG
+if (result == sourceIllegal) {
+    fprintf(stderr, "ConvertUTF16toUTF32 illegal seq 0x%04x,%04x\n", ch, ch2);
+    fflush(stderr);
+}
+#endif
+    return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Index into the table below with the first byte of a UTF-8 sequence to
+ * get the number of trailing bytes that are supposed to follow it.
+ * Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is
+ * left as-is for anyone who may want to do such conversion, which was
+ * allowed in earlier algorithms.
+ */
+static const char trailingBytesForUTF8[256] = {
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+    2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
+};
+
+/*
+ * Magic values subtracted from a buffer value during UTF8 conversion.
+ * This table contains as many values as there might be trailing bytes
+ * in a UTF-8 sequence.
+ */
+static const UTF32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL, 
+                     0x03C82080UL, 0xFA082080UL, 0x82082080UL };
+
+/*
+ * Once the bits are split out into bytes of UTF-8, this is a mask OR-ed
+ * into the first byte, depending on how many bytes follow.  There are
+ * as many entries in this table as there are UTF-8 sequence types.
+ * (I.e., one byte sequence, two byte... etc.). Remember that sequencs
+ * for *legal* UTF-8 will be 4 or fewer bytes total.
+ */
+static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
+
+/* --------------------------------------------------------------------- */
+
+/* The interface converts a whole buffer to avoid function-call overhead.
+ * Constants have been gathered. Loops & conditionals have been removed as
+ * much as possible for efficiency, in favor of drop-through switches.
+ * (See "Note A" at the bottom of the file for equivalent code.)
+ * If your compiler supports it, the "isLegalUTF8" call can be turned
+ * into an inline function.
+ */
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF16toUTF8 (
+        const UTF16** sourceStart, const UTF16* sourceEnd, 
+        UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
+    ConversionResult result = conversionOK;
+    const UTF16* source = *sourceStart;
+    UTF8* target = *targetStart;
+    while (source < sourceEnd) {
+        UTF32 ch;
+        unsigned short bytesToWrite = 0;
+        const UTF32 byteMask = 0xBF;
+        const UTF32 byteMark = 0x80; 
+        const UTF16* oldSource = source; /* In case we have to back up because of target overflow. */
+        ch = *source++;
+        /* If we have a surrogate pair, convert to UTF32 first. */
+        if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
+            /* If the 16 bits following the high surrogate are in the source buffer... */
+            if (source < sourceEnd) {
+                UTF32 ch2 = *source;
+                /* If it's a low surrogate, convert to UTF32. */
+                if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
+                    ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
+                        + (ch2 - UNI_SUR_LOW_START) + halfBase;
+                    ++source;
+                } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
+                    --source; /* return to the illegal value itself */
+                    result = sourceIllegal;
+                    break;
+                }
+            } else { /* We don't have the 16 bits following the high surrogate. */
+                --source; /* return to the high surrogate */
+                result = sourceExhausted;
+                break;
+            }
+        } else if (flags == strictConversion) {
+            /* UTF-16 surrogate values are illegal in UTF-32 */
+            if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
+                --source; /* return to the illegal value itself */
+                result = sourceIllegal;
+                break;
+            }
+        }
+        /* Figure out how many bytes the result will require */
+        if (ch < (UTF32)0x80) {      bytesToWrite = 1;
+        } else if (ch < (UTF32)0x800) {     bytesToWrite = 2;
+        } else if (ch < (UTF32)0x10000) {   bytesToWrite = 3;
+        } else if (ch < (UTF32)0x110000) {  bytesToWrite = 4;
+        } else {                            bytesToWrite = 3;
+                                            ch = UNI_REPLACEMENT_CHAR;
+        }
+
+        target += bytesToWrite;
+        if (target > targetEnd) {
+            source = oldSource; /* Back up source pointer! */
+            target -= bytesToWrite; result = targetExhausted; break;
+        }
+        switch (bytesToWrite) { /* note: everything falls through. */
+            case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
+            case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
+            case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
+            case 1: *--target =  (UTF8)(ch | firstByteMark[bytesToWrite]);
+        }
+        target += bytesToWrite;
+    }
+    *sourceStart = source;
+    *targetStart = target;
+    return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Utility routine to tell whether a sequence of bytes is legal UTF-8.
+ * This must be called with the length pre-determined by the first byte.
+ * If not calling this from ConvertUTF8to*, then the length can be set by:
+ *  length = trailingBytesForUTF8[*source]+1;
+ * and the sequence is illegal right away if there aren't that many bytes
+ * available.
+ * If presented with a length > 4, this returns false.  The Unicode
+ * definition of UTF-8 goes up to 4-byte sequences.
+ */
+
+static Boolean isLegalUTF8(const UTF8 *source, int length) {
+    UTF8 a;
+    const UTF8 *srcptr = source+length;
+    switch (length) {
+    default: return false;
+        /* Everything else falls through when "true"... */
+    case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
+    case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
+    case 2: if ((a = (*--srcptr)) > 0xBF) return false;
+
+        switch (*source) {
+            /* no fall-through in this inner switch */
+            case 0xE0: if (a < 0xA0) return false; break;
+            case 0xED: if (a > 0x9F) return false; break;
+            case 0xF0: if (a < 0x90) return false; break;
+            case 0xF4: if (a > 0x8F) return false; break;
+            default:   if (a < 0x80) return false;
+        }
+
+    case 1: if (*source >= 0x80 && *source < 0xC2) return false;
+    }
+    if (*source > 0xF4) return false;
+    return true;
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Exported function to return whether a UTF-8 sequence is legal or not.
+ * This is not used here; it's just exported.
+ */
+Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd) {
+    int length = trailingBytesForUTF8[*source]+1;
+    if (source+length > sourceEnd) {
+        return false;
+    }
+    return isLegalUTF8(source, length);
+}
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF8toUTF16 (
+        const UTF8** sourceStart, const UTF8* sourceEnd, 
+        UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {
+    ConversionResult result = conversionOK;
+    const UTF8* source = *sourceStart;
+    UTF16* target = *targetStart;
+    while (source < sourceEnd) {
+        UTF32 ch = 0;
+        unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
+        if (source + extraBytesToRead >= sourceEnd) {
+            result = sourceExhausted; break;
+        }
+        /* Do this check whether lenient or strict */
+        if (! isLegalUTF8(source, extraBytesToRead+1)) {
+            result = sourceIllegal;
+            break;
+        }
+        /*
+         * The cases all fall through. See "Note A" below.
+         */
+        switch (extraBytesToRead) {
+            case 5: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
+            case 4: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */
+            case 3: ch += *source++; ch <<= 6;
+            case 2: ch += *source++; ch <<= 6;
+            case 1: ch += *source++; ch <<= 6;
+            case 0: ch += *source++;
+        }
+        ch -= offsetsFromUTF8[extraBytesToRead];
+
+        if (target >= targetEnd) {
+            source -= (extraBytesToRead+1); /* Back up source pointer! */
+            result = targetExhausted; break;
+        }
+        if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
+            /* UTF-16 surrogate values are illegal in UTF-32 */
+            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+                if (flags == strictConversion) {
+                    source -= (extraBytesToRead+1); /* return to the illegal value itself */
+                    result = sourceIllegal;
+                    break;
+                } else {
+                    *target++ = UNI_REPLACEMENT_CHAR;
+                }
+            } else {
+                *target++ = (UTF16)ch; /* normal case */
+            }
+        } else if (ch > UNI_MAX_UTF16) {
+            if (flags == strictConversion) {
+                result = sourceIllegal;
+                source -= (extraBytesToRead+1); /* return to the start */
+                break; /* Bail out; shouldn't continue */
+            } else {
+                *target++ = UNI_REPLACEMENT_CHAR;
+            }
+        } else {
+            /* target is a character in range 0xFFFF - 0x10FFFF. */
+            if (target + 1 >= targetEnd) {
+                source -= (extraBytesToRead+1); /* Back up source pointer! */
+                result = targetExhausted; break;
+            }
+            ch -= halfBase;
+            *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
+            *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
+        }
+    }
+    *sourceStart = source;
+    *targetStart = target;
+    return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF32toUTF8 (
+        const UTF32** sourceStart, const UTF32* sourceEnd, 
+        UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
+    ConversionResult result = conversionOK;
+    const UTF32* source = *sourceStart;
+    UTF8* target = *targetStart;
+    while (source < sourceEnd) {
+        UTF32 ch;
+        unsigned short bytesToWrite = 0;
+        const UTF32 byteMask = 0xBF;
+        const UTF32 byteMark = 0x80; 
+        ch = *source++;
+        if (flags == strictConversion ) {
+            /* UTF-16 surrogate values are illegal in UTF-32 */
+            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+                --source; /* return to the illegal value itself */
+                result = sourceIllegal;
+                break;
+            }
+        }
+        /*
+         * Figure out how many bytes the result will require. Turn any
+         * illegally large UTF32 things (> Plane 17) into replacement chars.
+         */
+        if (ch < (UTF32)0x80) {      bytesToWrite = 1;
+        } else if (ch < (UTF32)0x800) {     bytesToWrite = 2;
+        } else if (ch < (UTF32)0x10000) {   bytesToWrite = 3;
+        } else if (ch <= UNI_MAX_LEGAL_UTF32) {  bytesToWrite = 4;
+        } else {                            bytesToWrite = 3;
+                                            ch = UNI_REPLACEMENT_CHAR;
+                                            result = sourceIllegal;
+        }
+        
+        target += bytesToWrite;
+        if (target > targetEnd) {
+            --source; /* Back up source pointer! */
+            target -= bytesToWrite; result = targetExhausted; break;
+        }
+        switch (bytesToWrite) { /* note: everything falls through. */
+            case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
+            case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
+            case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
+            case 1: *--target = (UTF8) (ch | firstByteMark[bytesToWrite]);
+        }
+        target += bytesToWrite;
+    }
+    *sourceStart = source;
+    *targetStart = target;
+    return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF8toUTF32 (
+        const UTF8** sourceStart, const UTF8* sourceEnd, 
+        UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
+    ConversionResult result = conversionOK;
+    const UTF8* source = *sourceStart;
+    UTF32* target = *targetStart;
+    while (source < sourceEnd) {
+        UTF32 ch = 0;
+        unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
+        if (source + extraBytesToRead >= sourceEnd) {
+            result = sourceExhausted; break;
+        }
+        /* Do this check whether lenient or strict */
+        if (! isLegalUTF8(source, extraBytesToRead+1)) {
+            result = sourceIllegal;
+            break;
+        }
+        /*
+         * The cases all fall through. See "Note A" below.
+         */
+        switch (extraBytesToRead) {
+            case 5: ch += *source++; ch <<= 6;
+            case 4: ch += *source++; ch <<= 6;
+            case 3: ch += *source++; ch <<= 6;
+            case 2: ch += *source++; ch <<= 6;
+            case 1: ch += *source++; ch <<= 6;
+            case 0: ch += *source++;
+        }
+        ch -= offsetsFromUTF8[extraBytesToRead];
+
+        if (target >= targetEnd) {
+            source -= (extraBytesToRead+1); /* Back up the source pointer! */
+            result = targetExhausted; break;
+        }
+        if (ch <= UNI_MAX_LEGAL_UTF32) {
+            /*
+             * UTF-16 surrogate values are illegal in UTF-32, and anything
+             * over Plane 17 (> 0x10FFFF) is illegal.
+             */
+            if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+                if (flags == strictConversion) {
+                    source -= (extraBytesToRead+1); /* return to the illegal value itself */
+                    result = sourceIllegal;
+                    break;
+                } else {
+                    *target++ = UNI_REPLACEMENT_CHAR;
+                }
+            } else {
+                *target++ = ch;
+            }
+        } else { /* i.e., ch > UNI_MAX_LEGAL_UTF32 */
+            result = sourceIllegal;
+            *target++ = UNI_REPLACEMENT_CHAR;
+        }
+    }
+    *sourceStart = source;
+    *targetStart = target;
+    return result;
+}
+
+}
+
+/* ---------------------------------------------------------------------
+
+    Note A.
+    The fall-through switches in UTF-8 reading code save a
+    temp variable, some decrements & conditionals.  The switches
+    are equivalent to the following loop:
+        {
+            int tmpBytesToRead = extraBytesToRead+1;
+            do {
+                ch += *source++;
+                --tmpBytesToRead;
+                if (tmpBytesToRead) ch <<= 6;
+            } while (tmpBytesToRead > 0);
+        }
+    In UTF-8 writing code, the switches on "bytesToWrite" are
+    similarly unrolled loops.
+
+   --------------------------------------------------------------------- */
diff --git a/src/linenoise/ConvertUTF.h b/src/linenoise/ConvertUTF.h
new file mode 100755
index 000000000..8a296235d
--- /dev/null
+++ b/src/linenoise/ConvertUTF.h
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2001-2004 Unicode, Inc.
+ * 
+ * Disclaimer
+ * 
+ * This source code is provided as is by Unicode, Inc. No claims are
+ * made as to fitness for any particular purpose. No warranties of any
+ * kind are expressed or implied. The recipient agrees to determine
+ * applicability of information provided. If this file has been
+ * purchased on magnetic or optical media from Unicode, Inc., the
+ * sole remedy for any claim will be exchange of defective media
+ * within 90 days of receipt.
+ * 
+ * Limitations on Rights to Redistribute This Code
+ * 
+ * Unicode, Inc. hereby grants the right to freely use the information
+ * supplied in this file in the creation of products supporting the
+ * Unicode Standard, and to make copies of this file in any form
+ * for internal or external distribution as long as this notice
+ * remains attached.
+ */
+
+/* ---------------------------------------------------------------------
+
+    Conversions between UTF32, UTF-16, and UTF-8.  Header file.
+
+    Several funtions are included here, forming a complete set of
+    conversions between the three formats.  UTF-7 is not included
+    here, but is handled in a separate source file.
+
+    Each of these routines takes pointers to input buffers and output
+    buffers.  The input buffers are const.
+
+    Each routine converts the text between *sourceStart and sourceEnd,
+    putting the result into the buffer between *targetStart and
+    targetEnd. Note: the end pointers are *after* the last item: e.g. 
+    *(sourceEnd - 1) is the last item.
+
+    The return result indicates whether the conversion was successful,
+    and if not, whether the problem was in the source or target buffers.
+    (Only the first encountered problem is indicated.)
+
+    After the conversion, *sourceStart and *targetStart are both
+    updated to point to the end of last text successfully converted in
+    the respective buffers.
+
+    Input parameters:
+        sourceStart - pointer to a pointer to the source buffer.
+                The contents of this are modified on return so that
+                it points at the next thing to be converted.
+        targetStart - similarly, pointer to pointer to the target buffer.
+        sourceEnd, targetEnd - respectively pointers to the ends of the
+                two buffers, for overflow checking only.
+
+    These conversion functions take a ConversionFlags argument. When this
+    flag is set to strict, both irregular sequences and isolated surrogates
+    will cause an error.  When the flag is set to lenient, both irregular
+    sequences and isolated surrogates are converted.
+
+    Whether the flag is strict or lenient, all illegal sequences will cause
+    an error return. This includes sequences such as: <F4 90 80 80>, <C0 80>,
+    or <A0> in UTF-8, and values above 0x10FFFF in UTF-32. Conformant code
+    must check for illegal sequences.
+
+    When the flag is set to lenient, characters over 0x10FFFF are converted
+    to the replacement character; otherwise (when the flag is set to strict)
+    they constitute an error.
+
+    Output parameters:
+        The value "sourceIllegal" is returned from some routines if the input
+        sequence is malformed.  When "sourceIllegal" is returned, the source
+        value will point to the illegal value that caused the problem. E.g.,
+        in UTF-8 when a sequence is malformed, it points to the start of the
+        malformed sequence.  
+
+    Author: Mark E. Davis, 1994.
+    Rev History: Rick McGowan, fixes & updates May 2001.
+                 Fixes & updates, Sept 2001.
+
+------------------------------------------------------------------------ */
+
+/* ---------------------------------------------------------------------
+    The following 4 definitions are compiler-specific.
+    The C standard does not guarantee that wchar_t has at least
+    16 bits, so wchar_t is no less portable than unsigned short!
+    All should be unsigned values to avoid sign extension during
+    bit mask & shift operations.
+------------------------------------------------------------------------ */
+
+#if 0
+typedef unsigned long  UTF32; /* at least 32 bits */
+typedef unsigned short UTF16; /* at least 16 bits */
+typedef unsigned char  UTF8;  /* typically 8 bits */
+#endif
+
+#include <stdint.h>
+#include <string>
+
+namespace linenoise_ng {
+
+typedef uint32_t         UTF32;
+typedef uint16_t         UTF16;
+typedef uint8_t          UTF8;
+typedef unsigned char    Boolean; /* 0 or 1 */
+
+/* Some fundamental constants */
+#define UNI_REPLACEMENT_CHAR (UTF32)0x0000FFFD
+#define UNI_MAX_BMP (UTF32)0x0000FFFF
+#define UNI_MAX_UTF16 (UTF32)0x0010FFFF
+#define UNI_MAX_UTF32 (UTF32)0x7FFFFFFF
+#define UNI_MAX_LEGAL_UTF32 (UTF32)0x0010FFFF
+
+typedef enum {
+        conversionOK,           /* conversion successful */
+        sourceExhausted,        /* partial character in source, but hit end */
+        targetExhausted,        /* insuff. room in target for conversion */
+        sourceIllegal           /* source sequence is illegal/malformed */
+} ConversionResult;
+
+typedef enum {
+        strictConversion = 0,
+        lenientConversion
+} ConversionFlags;
+
+// /* This is for C++ and does no harm in C */
+// #ifdef __cplusplus
+// extern "C" {
+// #endif
+
+ConversionResult ConvertUTF8toUTF16 (
+                const UTF8** sourceStart, const UTF8* sourceEnd, 
+                UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags);
+
+ConversionResult ConvertUTF16toUTF8 (
+                const UTF16** sourceStart, const UTF16* sourceEnd, 
+                UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
+                
+ConversionResult ConvertUTF8toUTF32 (
+                const UTF8** sourceStart, const UTF8* sourceEnd, 
+                UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
+
+ConversionResult ConvertUTF32toUTF8 (
+                const UTF32** sourceStart, const UTF32* sourceEnd, 
+                UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags);
+                
+ConversionResult ConvertUTF16toUTF32 (
+                const UTF16** sourceStart, const UTF16* sourceEnd, 
+                UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags);
+
+ConversionResult ConvertUTF32toUTF16 (
+                const UTF32** sourceStart, const UTF32* sourceEnd, 
+                char16_t** targetStart, char16_t* targetEnd, ConversionFlags flags);
+
+Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd);
+
+// #ifdef __cplusplus
+// }
+// #endif
+
+}
+
+/* --------------------------------------------------------------------- */
diff --git a/src/linenoise/LICENSE b/src/linenoise/LICENSE
index 18e814865..b7c58c445 100644
--- a/src/linenoise/LICENSE
+++ b/src/linenoise/LICENSE
@@ -1,25 +1,66 @@
-Copyright (c) 2010-2014, Salvatore Sanfilippo <antirez at gmail dot com>
-Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+linenoise.cpp
+=============
+
+Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
+Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
 
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 
-* Redistributions of source code must retain the above copyright notice,
-  this list of conditions and the following disclaimer.
-
-* Redistributions in binary form must reproduce the above copyright notice,
-  this list of conditions and the following disclaimer in the documentation
-  and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  * Redistributions of source code must retain the above copyright notice,
+    this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+  * Neither the name of Redis nor the names of its contributors may be used
+    to endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+
+wcwidth.cpp
+===========
+
+Markus Kuhn -- 2007-05-26 (Unicode 5.0)
+
+Permission to use, copy, modify, and distribute this software
+for any purpose and without fee is hereby granted. The author
+disclaims all warranties with regard to this software.
+
+
+
+ConvertUTF.cpp
+==============
+
+Copyright 2001-2004 Unicode, Inc.
+ 
+Disclaimer
+ 
+This source code is provided as is by Unicode, Inc. No claims are
+made as to fitness for any particular purpose. No warranties of any
+kind are expressed or implied. The recipient agrees to determine
+applicability of information provided. If this file has been
+purchased on magnetic or optical media from Unicode, Inc., the
+sole remedy for any claim will be exchange of defective media
+within 90 days of receipt.
+ 
+Limitations on Rights to Redistribute This Code
+ 
+Unicode, Inc. hereby grants the right to freely use the information
+supplied in this file in the creation of products supporting the
+Unicode Standard, and to make copies of this file in any form
+for internal or external distribution as long as this notice
+remains attached.
diff --git a/src/linenoise/linenoise.c b/src/linenoise/linenoise.c
deleted file mode 100644
index fce14a7c5..000000000
--- a/src/linenoise/linenoise.c
+++ /dev/null
@@ -1,1199 +0,0 @@
-/* linenoise.c -- guerrilla line editing library against the idea that a
- * line editing lib needs to be 20,000 lines of C code.
- *
- * You can find the latest source code at:
- *
- *   http://github.com/antirez/linenoise
- *
- * Does a number of crazy assumptions that happen to be true in 99.9999% of
- * the 2010 UNIX computers around.
- *
- * ------------------------------------------------------------------------
- *
- * Copyright (c) 2010-2016, Salvatore Sanfilippo <antirez at gmail dot com>
- * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *  *  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- *
- *  *  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * ------------------------------------------------------------------------
- *
- * References:
- * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
- * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
- *
- * Todo list:
- * - Filter bogus Ctrl+<char> combinations.
- * - Win32 support
- *
- * Bloat:
- * - History search like Ctrl+r in readline?
- *
- * List of escape sequences used by this program, we do everything just
- * with three sequences. In order to be so cheap we may have some
- * flickering effect with some slow terminal, but the lesser sequences
- * the more compatible.
- *
- * EL (Erase Line)
- *    Sequence: ESC [ n K
- *    Effect: if n is 0 or missing, clear from cursor to end of line
- *    Effect: if n is 1, clear from beginning of line to cursor
- *    Effect: if n is 2, clear entire line
- *
- * CUF (CUrsor Forward)
- *    Sequence: ESC [ n C
- *    Effect: moves cursor forward n chars
- *
- * CUB (CUrsor Backward)
- *    Sequence: ESC [ n D
- *    Effect: moves cursor backward n chars
- *
- * The following is used to get the terminal width if getting
- * the width with the TIOCGWINSZ ioctl fails
- *
- * DSR (Device Status Report)
- *    Sequence: ESC [ 6 n
- *    Effect: reports the current cusor position as ESC [ n ; m R
- *            where n is the row and m is the column
- *
- * When multi line mode is enabled, we also use an additional escape
- * sequence. However multi line editing is disabled by default.
- *
- * CUU (Cursor Up)
- *    Sequence: ESC [ n A
- *    Effect: moves cursor up of n chars.
- *
- * CUD (Cursor Down)
- *    Sequence: ESC [ n B
- *    Effect: moves cursor down of n chars.
- *
- * When linenoiseClearScreen() is called, two additional escape sequences
- * are used in order to clear the screen and position the cursor at home
- * position.
- *
- * CUP (Cursor position)
- *    Sequence: ESC [ H
- *    Effect: moves the cursor to upper left corner
- *
- * ED (Erase display)
- *    Sequence: ESC [ 2 J
- *    Effect: clear the whole screen
- *
- */
-
-#include <termios.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <unistd.h>
-#include "linenoise.h"
-
-#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
-#define LINENOISE_MAX_LINE 4096
-static char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
-static linenoiseCompletionCallback *completionCallback = NULL;
-static linenoiseHintsCallback *hintsCallback = NULL;
-static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
-
-static struct termios orig_termios; /* In order to restore at exit.*/
-static int rawmode = 0; /* For atexit() function to check if restore is needed*/
-static int mlmode = 0;  /* Multi line mode. Default is single line. */
-static int atexit_registered = 0; /* Register atexit just 1 time. */
-static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
-static int history_len = 0;
-static char **history = NULL;
-
-/* The linenoiseState structure represents the state during line editing.
- * We pass this state to functions implementing specific editing
- * functionalities. */
-struct linenoiseState {
-    int ifd;            /* Terminal stdin file descriptor. */
-    int ofd;            /* Terminal stdout file descriptor. */
-    char *buf;          /* Edited line buffer. */
-    size_t buflen;      /* Edited line buffer size. */
-    const char *prompt; /* Prompt to display. */
-    size_t plen;        /* Prompt length. */
-    size_t pos;         /* Current cursor position. */
-    size_t oldpos;      /* Previous refresh cursor position. */
-    size_t len;         /* Current edited line length. */
-    size_t cols;        /* Number of columns in terminal. */
-    size_t maxrows;     /* Maximum num of rows used so far (multiline mode) */
-    int history_index;  /* The history index we are currently editing. */
-};
-
-enum KEY_ACTION{
-	KEY_NULL = 0,	    /* NULL */
-	CTRL_A = 1,         /* Ctrl+a */
-	CTRL_B = 2,         /* Ctrl-b */
-	CTRL_C = 3,         /* Ctrl-c */
-	CTRL_D = 4,         /* Ctrl-d */
-	CTRL_E = 5,         /* Ctrl-e */
-	CTRL_F = 6,         /* Ctrl-f */
-	CTRL_H = 8,         /* Ctrl-h */
-	TAB = 9,            /* Tab */
-	CTRL_K = 11,        /* Ctrl+k */
-	CTRL_L = 12,        /* Ctrl+l */
-	ENTER = 13,         /* Enter */
-	CTRL_N = 14,        /* Ctrl-n */
-	CTRL_P = 16,        /* Ctrl-p */
-	CTRL_T = 20,        /* Ctrl-t */
-	CTRL_U = 21,        /* Ctrl+u */
-	CTRL_W = 23,        /* Ctrl+w */
-	ESC = 27,           /* Escape */
-	BACKSPACE =  127    /* Backspace */
-};
-
-static void linenoiseAtExit(void);
-int linenoiseHistoryAdd(const char *line);
-static void refreshLine(struct linenoiseState *l);
-
-/* Debugging macro. */
-#if 0
-FILE *lndebug_fp = NULL;
-#define lndebug(...) \
-    do { \
-        if (lndebug_fp == NULL) { \
-            lndebug_fp = fopen("/tmp/lndebug.txt","a"); \
-            fprintf(lndebug_fp, \
-            "[%d %d %d] p: %d, rows: %d, rpos: %d, max: %d, oldmax: %d\n", \
-            (int)l->len,(int)l->pos,(int)l->oldpos,plen,rows,rpos, \
-            (int)l->maxrows,old_rows); \
-        } \
-        fprintf(lndebug_fp, ", " __VA_ARGS__); \
-        fflush(lndebug_fp); \
-    } while (0)
-#else
-#define lndebug(fmt, ...)
-#endif
-
-/* ======================= Low level terminal handling ====================== */
-
-/* Set if to use or not the multi line mode. */
-void linenoiseSetMultiLine(int ml) {
-    mlmode = ml;
-}
-
-/* Return true if the terminal name is in the list of terminals we know are
- * not able to understand basic escape sequences. */
-static int isUnsupportedTerm(void) {
-    char *term = getenv("TERM");
-    int j;
-
-    if (term == NULL) return 0;
-    for (j = 0; unsupported_term[j]; j++)
-        if (!strcasecmp(term,unsupported_term[j])) return 1;
-    return 0;
-}
-
-/* Raw mode: 1960 magic shit. */
-static int enableRawMode(int fd) {
-    struct termios raw;
-
-    if (!isatty(STDIN_FILENO)) goto fatal;
-    if (!atexit_registered) {
-        atexit(linenoiseAtExit);
-        atexit_registered = 1;
-    }
-    if (tcgetattr(fd,&orig_termios) == -1) goto fatal;
-
-    raw = orig_termios;  /* modify the original mode */
-    /* input modes: no break, no CR to NL, no parity check, no strip char,
-     * no start/stop output control. */
-    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
-    /* output modes - disable post processing */
-    raw.c_oflag &= ~(OPOST);
-    /* control modes - set 8 bit chars */
-    raw.c_cflag |= (CS8);
-    /* local modes - choing off, canonical off, no extended functions,
-     * no signal chars (^Z,^C) */
-    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
-    /* control chars - set return condition: min number of bytes and timer.
-     * We want read to return every single byte, without timeout. */
-    raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
-
-    /* put terminal in raw mode after flushing */
-    if (tcsetattr(fd,TCSAFLUSH,&raw) < 0) goto fatal;
-    rawmode = 1;
-    return 0;
-
-fatal:
-    errno = ENOTTY;
-    return -1;
-}
-
-static void disableRawMode(int fd) {
-    /* Don't even check the return value as it's too late. */
-    if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1)
-        rawmode = 0;
-}
-
-/* Use the ESC [6n escape sequence to query the horizontal cursor position
- * and return it. On error -1 is returned, on success the position of the
- * cursor. */
-static int getCursorPosition(int ifd, int ofd) {
-    char buf[32];
-    int cols, rows;
-    unsigned int i = 0;
-
-    /* Report cursor location */
-    if (write(ofd, "\x1b[6n", 4) != 4) return -1;
-
-    /* Read the response: ESC [ rows ; cols R */
-    while (i < sizeof(buf)-1) {
-        if (read(ifd,buf+i,1) != 1) break;
-        if (buf[i] == 'R') break;
-        i++;
-    }
-    buf[i] = '\0';
-
-    /* Parse it. */
-    if (buf[0] != ESC || buf[1] != '[') return -1;
-    if (sscanf(buf+2,"%d;%d",&rows,&cols) != 2) return -1;
-    return cols;
-}
-
-/* Try to get the number of columns in the current terminal, or assume 80
- * if it fails. */
-static int getColumns(int ifd, int ofd) {
-    struct winsize ws;
-
-    if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
-        /* ioctl() failed. Try to query the terminal itself. */
-        int start, cols;
-
-        /* Get the initial position so we can restore it later. */
-        start = getCursorPosition(ifd,ofd);
-        if (start == -1) goto failed;
-
-        /* Go to right margin and get position. */
-        if (write(ofd,"\x1b[999C",6) != 6) goto failed;
-        cols = getCursorPosition(ifd,ofd);
-        if (cols == -1) goto failed;
-
-        /* Restore position. */
-        if (cols > start) {
-            char seq[32];
-            snprintf(seq,32,"\x1b[%dD",cols-start);
-            if (write(ofd,seq,strlen(seq)) == -1) {
-                /* Can't recover... */
-            }
-        }
-        return cols;
-    } else {
-        return ws.ws_col;
-    }
-
-failed:
-    return 80;
-}
-
-/* Clear the screen. Used to handle ctrl+l */
-void linenoiseClearScreen(void) {
-    if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) {
-        /* nothing to do, just to avoid warning. */
-    }
-}
-
-/* Beep, used for completion when there is nothing to complete or when all
- * the choices were already shown. */
-static void linenoiseBeep(void) {
-    fprintf(stderr, "\x7");
-    fflush(stderr);
-}
-
-/* ============================== Completion ================================ */
-
-/* Free a list of completion option populated by linenoiseAddCompletion(). */
-static void freeCompletions(linenoiseCompletions *lc) {
-    size_t i;
-    for (i = 0; i < lc->len; i++)
-        free(lc->cvec[i]);
-    if (lc->cvec != NULL)
-        free(lc->cvec);
-}
-
-/* This is an helper function for linenoiseEdit() and is called when the
- * user types the <tab> key in order to complete the string currently in the
- * input.
- *
- * The state of the editing is encapsulated into the pointed linenoiseState
- * structure as described in the structure definition. */
-static int completeLine(struct linenoiseState *ls) {
-    linenoiseCompletions lc = { 0, NULL };
-    int nread, nwritten;
-    char c = 0;
-
-    completionCallback(ls->buf,&lc);
-    if (lc.len == 0) {
-        linenoiseBeep();
-    } else {
-        size_t stop = 0, i = 0;
-
-        while(!stop) {
-            /* Show completion or original buffer */
-            if (i < lc.len) {
-                struct linenoiseState saved = *ls;
-
-                ls->len = ls->pos = strlen(lc.cvec[i]);
-                ls->buf = lc.cvec[i];
-                refreshLine(ls);
-                ls->len = saved.len;
-                ls->pos = saved.pos;
-                ls->buf = saved.buf;
-            } else {
-                refreshLine(ls);
-            }
-
-            nread = read(ls->ifd,&c,1);
-            if (nread <= 0) {
-                freeCompletions(&lc);
-                return -1;
-            }
-
-            switch(c) {
-                case 9: /* tab */
-                    i = (i+1) % (lc.len+1);
-                    if (i == lc.len) linenoiseBeep();
-                    break;
-                case 27: /* escape */
-                    /* Re-show original buffer */
-                    if (i < lc.len) refreshLine(ls);
-                    stop = 1;
-                    break;
-                default:
-                    /* Update buffer and return */
-                    if (i < lc.len) {
-                        nwritten = snprintf(ls->buf,ls->buflen,"%s",lc.cvec[i]);
-                        ls->len = ls->pos = nwritten;
-                    }
-                    stop = 1;
-                    break;
-            }
-        }
-    }
-
-    freeCompletions(&lc);
-    return c; /* Return last read character */
-}
-
-/* Register a callback function to be called for tab-completion. */
-void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) {
-    completionCallback = fn;
-}
-
-/* Register a hits function to be called to show hits to the user at the
- * right of the prompt. */
-void linenoiseSetHintsCallback(linenoiseHintsCallback *fn) {
-    hintsCallback = fn;
-}
-
-/* Register a function to free the hints returned by the hints callback
- * registered with linenoiseSetHintsCallback(). */
-void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *fn) {
-    freeHintsCallback = fn;
-}
-
-/* This function is used by the callback function registered by the user
- * in order to add completion options given the input string when the
- * user typed <tab>. See the example.c source code for a very easy to
- * understand example. */
-void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
-    size_t len = strlen(str);
-    char *copy, **cvec;
-
-    copy = malloc(len+1);
-    if (copy == NULL) return;
-    memcpy(copy,str,len+1);
-    cvec = realloc(lc->cvec,sizeof(char*)*(lc->len+1));
-    if (cvec == NULL) {
-        free(copy);
-        return;
-    }
-    lc->cvec = cvec;
-    lc->cvec[lc->len++] = copy;
-}
-
-/* =========================== Line editing ================================= */
-
-/* We define a very simple "append buffer" structure, that is an heap
- * allocated string where we can append to. This is useful in order to
- * write all the escape sequences in a buffer and flush them to the standard
- * output in a single call, to avoid flickering effects. */
-struct abuf {
-    char *b;
-    int len;
-};
-
-static void abInit(struct abuf *ab) {
-    ab->b = NULL;
-    ab->len = 0;
-}
-
-static void abAppend(struct abuf *ab, const char *s, int len) {
-    char *new = realloc(ab->b,ab->len+len);
-
-    if (new == NULL) return;
-    memcpy(new+ab->len,s,len);
-    ab->b = new;
-    ab->len += len;
-}
-
-static void abFree(struct abuf *ab) {
-    free(ab->b);
-}
-
-/* Helper of refreshSingleLine() and refreshMultiLine() to show hints
- * to the right of the prompt. */
-void refreshShowHints(struct abuf *ab, struct linenoiseState *l, int plen) {
-    char seq[64];
-    if (hintsCallback && plen+l->len < l->cols) {
-        int color = -1, bold = 0;
-        char *hint = hintsCallback(l->buf,&color,&bold);
-        if (hint) {
-            int hintlen = strlen(hint);
-            int hintmaxlen = l->cols-(plen+l->len);
-            if (hintlen > hintmaxlen) hintlen = hintmaxlen;
-            if (bold == 1 && color == -1) color = 37;
-            if (color != -1 || bold != 0)
-                snprintf(seq,64,"\033[%d;%d;49m",bold,color);
-            abAppend(ab,seq,strlen(seq));
-            abAppend(ab,hint,hintlen);
-            if (color != -1 || bold != 0)
-                abAppend(ab,"\033[0m",4);
-            /* Call the function to free the hint returned. */
-            if (freeHintsCallback) freeHintsCallback(hint);
-        }
-    }
-}
-
-/* Single line low level line refresh.
- *
- * Rewrite the currently edited line accordingly to the buffer content,
- * cursor position, and number of columns of the terminal. */
-static void refreshSingleLine(struct linenoiseState *l) {
-    char seq[64];
-    size_t plen = strlen(l->prompt);
-    int fd = l->ofd;
-    char *buf = l->buf;
-    size_t len = l->len;
-    size_t pos = l->pos;
-    struct abuf ab;
-
-    while((plen+pos) >= l->cols) {
-        buf++;
-        len--;
-        pos--;
-    }
-    while (plen+len > l->cols) {
-        len--;
-    }
-
-    abInit(&ab);
-    /* Cursor to left edge */
-    snprintf(seq,64,"\r");
-    abAppend(&ab,seq,strlen(seq));
-    /* Write the prompt and the current buffer content */
-    abAppend(&ab,l->prompt,strlen(l->prompt));
-    abAppend(&ab,buf,len);
-    /* Show hits if any. */
-    refreshShowHints(&ab,l,plen);
-    /* Erase to right */
-    snprintf(seq,64,"\x1b[0K");
-    abAppend(&ab,seq,strlen(seq));
-    /* Move cursor to original position. */
-    snprintf(seq,64,"\r\x1b[%dC", (int)(pos+plen));
-    abAppend(&ab,seq,strlen(seq));
-    if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
-    abFree(&ab);
-}
-
-/* Multi line low level line refresh.
- *
- * Rewrite the currently edited line accordingly to the buffer content,
- * cursor position, and number of columns of the terminal. */
-static void refreshMultiLine(struct linenoiseState *l) {
-    char seq[64];
-    int plen = strlen(l->prompt);
-    int rows = (plen+l->len+l->cols-1)/l->cols; /* rows used by current buf. */
-    int rpos = (plen+l->oldpos+l->cols)/l->cols; /* cursor relative row. */
-    int rpos2; /* rpos after refresh. */
-    int col; /* colum position, zero-based. */
-    int old_rows = l->maxrows;
-    int fd = l->ofd, j;
-    struct abuf ab;
-
-    /* Update maxrows if needed. */
-    if (rows > (int)l->maxrows) l->maxrows = rows;
-
-    /* First step: clear all the lines used before. To do so start by
-     * going to the last row. */
-    abInit(&ab);
-    if (old_rows-rpos > 0) {
-        lndebug("go down %d", old_rows-rpos);
-        snprintf(seq,64,"\x1b[%dB", old_rows-rpos);
-        abAppend(&ab,seq,strlen(seq));
-    }
-
-    /* Now for every row clear it, go up. */
-    for (j = 0; j < old_rows-1; j++) {
-        lndebug("clear+up");
-        snprintf(seq,64,"\r\x1b[0K\x1b[1A");
-        abAppend(&ab,seq,strlen(seq));
-    }
-
-    /* Clean the top line. */
-    lndebug("clear");
-    snprintf(seq,64,"\r\x1b[0K");
-    abAppend(&ab,seq,strlen(seq));
-
-    /* Write the prompt and the current buffer content */
-    abAppend(&ab,l->prompt,strlen(l->prompt));
-    abAppend(&ab,l->buf,l->len);
-
-    /* Show hits if any. */
-    refreshShowHints(&ab,l,plen);
-
-    /* If we are at the very end of the screen with our prompt, we need to
-     * emit a newline and move the prompt to the first column. */
-    if (l->pos &&
-        l->pos == l->len &&
-        (l->pos+plen) % l->cols == 0)
-    {
-        lndebug("<newline>");
-        abAppend(&ab,"\n",1);
-        snprintf(seq,64,"\r");
-        abAppend(&ab,seq,strlen(seq));
-        rows++;
-        if (rows > (int)l->maxrows) l->maxrows = rows;
-    }
-
-    /* Move cursor to right position. */
-    rpos2 = (plen+l->pos+l->cols)/l->cols; /* current cursor relative row. */
-    lndebug("rpos2 %d", rpos2);
-
-    /* Go up till we reach the expected positon. */
-    if (rows-rpos2 > 0) {
-        lndebug("go-up %d", rows-rpos2);
-        snprintf(seq,64,"\x1b[%dA", rows-rpos2);
-        abAppend(&ab,seq,strlen(seq));
-    }
-
-    /* Set column. */
-    col = (plen+(int)l->pos) % (int)l->cols;
-    lndebug("set col %d", 1+col);
-    if (col)
-        snprintf(seq,64,"\r\x1b[%dC", col);
-    else
-        snprintf(seq,64,"\r");
-    abAppend(&ab,seq,strlen(seq));
-
-    lndebug("\n");
-    l->oldpos = l->pos;
-
-    if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
-    abFree(&ab);
-}
-
-/* Calls the two low level functions refreshSingleLine() or
- * refreshMultiLine() according to the selected mode. */
-static void refreshLine(struct linenoiseState *l) {
-    if (mlmode)
-        refreshMultiLine(l);
-    else
-        refreshSingleLine(l);
-}
-
-/* Insert the character 'c' at cursor current position.
- *
- * On error writing to the terminal -1 is returned, otherwise 0. */
-int linenoiseEditInsert(struct linenoiseState *l, char c) {
-    if (l->len < l->buflen) {
-        if (l->len == l->pos) {
-            l->buf[l->pos] = c;
-            l->pos++;
-            l->len++;
-            l->buf[l->len] = '\0';
-            if ((!mlmode && l->plen+l->len < l->cols && !hintsCallback)) {
-                /* Avoid a full update of the line in the
-                 * trivial case. */
-                if (write(l->ofd,&c,1) == -1) return -1;
-            } else {
-                refreshLine(l);
-            }
-        } else {
-            memmove(l->buf+l->pos+1,l->buf+l->pos,l->len-l->pos);
-            l->buf[l->pos] = c;
-            l->len++;
-            l->pos++;
-            l->buf[l->len] = '\0';
-            refreshLine(l);
-        }
-    }
-    return 0;
-}
-
-/* Move cursor on the left. */
-void linenoiseEditMoveLeft(struct linenoiseState *l) {
-    if (l->pos > 0) {
-        l->pos--;
-        refreshLine(l);
-    }
-}
-
-/* Move cursor on the right. */
-void linenoiseEditMoveRight(struct linenoiseState *l) {
-    if (l->pos != l->len) {
-        l->pos++;
-        refreshLine(l);
-    }
-}
-
-/* Move cursor to the start of the line. */
-void linenoiseEditMoveHome(struct linenoiseState *l) {
-    if (l->pos != 0) {
-        l->pos = 0;
-        refreshLine(l);
-    }
-}
-
-/* Move cursor to the end of the line. */
-void linenoiseEditMoveEnd(struct linenoiseState *l) {
-    if (l->pos != l->len) {
-        l->pos = l->len;
-        refreshLine(l);
-    }
-}
-
-/* Substitute the currently edited line with the next or previous history
- * entry as specified by 'dir'. */
-#define LINENOISE_HISTORY_NEXT 0
-#define LINENOISE_HISTORY_PREV 1
-void linenoiseEditHistoryNext(struct linenoiseState *l, int dir) {
-    if (history_len > 1) {
-        /* Update the current history entry before to
-         * overwrite it with the next one. */
-        free(history[history_len - 1 - l->history_index]);
-        history[history_len - 1 - l->history_index] = strdup(l->buf);
-        /* Show the new entry */
-        l->history_index += (dir == LINENOISE_HISTORY_PREV) ? 1 : -1;
-        if (l->history_index < 0) {
-            l->history_index = 0;
-            return;
-        } else if (l->history_index >= history_len) {
-            l->history_index = history_len-1;
-            return;
-        }
-        strncpy(l->buf,history[history_len - 1 - l->history_index],l->buflen);
-        l->buf[l->buflen-1] = '\0';
-        l->len = l->pos = strlen(l->buf);
-        refreshLine(l);
-    }
-}
-
-/* Delete the character at the right of the cursor without altering the cursor
- * position. Basically this is what happens with the "Delete" keyboard key. */
-void linenoiseEditDelete(struct linenoiseState *l) {
-    if (l->len > 0 && l->pos < l->len) {
-        memmove(l->buf+l->pos,l->buf+l->pos+1,l->len-l->pos-1);
-        l->len--;
-        l->buf[l->len] = '\0';
-        refreshLine(l);
-    }
-}
-
-/* Backspace implementation. */
-void linenoiseEditBackspace(struct linenoiseState *l) {
-    if (l->pos > 0 && l->len > 0) {
-        memmove(l->buf+l->pos-1,l->buf+l->pos,l->len-l->pos);
-        l->pos--;
-        l->len--;
-        l->buf[l->len] = '\0';
-        refreshLine(l);
-    }
-}
-
-/* Delete the previosu word, maintaining the cursor at the start of the
- * current word. */
-void linenoiseEditDeletePrevWord(struct linenoiseState *l) {
-    size_t old_pos = l->pos;
-    size_t diff;
-
-    while (l->pos > 0 && l->buf[l->pos-1] == ' ')
-        l->pos--;
-    while (l->pos > 0 && l->buf[l->pos-1] != ' ')
-        l->pos--;
-    diff = old_pos - l->pos;
-    memmove(l->buf+l->pos,l->buf+old_pos,l->len-old_pos+1);
-    l->len -= diff;
-    refreshLine(l);
-}
-
-/* This function is the core of the line editing capability of linenoise.
- * It expects 'fd' to be already in "raw mode" so that every key pressed
- * will be returned ASAP to read().
- *
- * The resulting string is put into 'buf' when the user type enter, or
- * when ctrl+d is typed.
- *
- * The function returns the length of the current buffer. */
-static int linenoiseEdit(int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt)
-{
-    struct linenoiseState l;
-
-    /* Populate the linenoise state that we pass to functions implementing
-     * specific editing functionalities. */
-    l.ifd = stdin_fd;
-    l.ofd = stdout_fd;
-    l.buf = buf;
-    l.buflen = buflen;
-    l.prompt = prompt;
-    l.plen = strlen(prompt);
-    l.oldpos = l.pos = 0;
-    l.len = 0;
-    l.cols = getColumns(stdin_fd, stdout_fd);
-    l.maxrows = 0;
-    l.history_index = 0;
-
-    /* Buffer starts empty. */
-    l.buf[0] = '\0';
-    l.buflen--; /* Make sure there is always space for the nulterm */
-
-    /* The latest history entry is always our current buffer, that
-     * initially is just an empty string. */
-    linenoiseHistoryAdd("");
-
-    if (write(l.ofd,prompt,l.plen) == -1) return -1;
-    while(1) {
-        char c;
-        int nread;
-        char seq[3];
-
-        nread = read(l.ifd,&c,1);
-        if (nread <= 0) return l.len;
-
-        /* Only autocomplete when the callback is set. It returns < 0 when
-         * there was an error reading from fd. Otherwise it will return the
-         * character that should be handled next. */
-        if (c == 9 && completionCallback != NULL) {
-            c = completeLine(&l);
-            /* Return on errors */
-            if (c < 0) return l.len;
-            /* Read next character when 0 */
-            if (c == 0) continue;
-        }
-
-        switch(c) {
-        case ENTER:    /* enter */
-            history_len--;
-            free(history[history_len]);
-            if (mlmode) linenoiseEditMoveEnd(&l);
-            if (hintsCallback) {
-                /* Force a refresh without hints to leave the previous
-                 * line as the user typed it after a newline. */
-                linenoiseHintsCallback *hc = hintsCallback;
-                hintsCallback = NULL;
-                refreshLine(&l);
-                hintsCallback = hc;
-            }
-            return (int)l.len;
-        case CTRL_C:     /* ctrl-c */
-            errno = EAGAIN;
-            return -1;
-        case BACKSPACE:   /* backspace */
-        case 8:     /* ctrl-h */
-            linenoiseEditBackspace(&l);
-            break;
-        case CTRL_D:     /* ctrl-d, remove char at right of cursor, or if the
-                            line is empty, act as end-of-file. */
-            if (l.len > 0) {
-                linenoiseEditDelete(&l);
-            } else {
-                history_len--;
-                free(history[history_len]);
-                return -1;
-            }
-            break;
-        case CTRL_T:    /* ctrl-t, swaps current character with previous. */
-            if (l.pos > 0 && l.pos < l.len) {
-                int aux = buf[l.pos-1];
-                buf[l.pos-1] = buf[l.pos];
-                buf[l.pos] = aux;
-                if (l.pos != l.len-1) l.pos++;
-                refreshLine(&l);
-            }
-            break;
-        case CTRL_B:     /* ctrl-b */
-            linenoiseEditMoveLeft(&l);
-            break;
-        case CTRL_F:     /* ctrl-f */
-            linenoiseEditMoveRight(&l);
-            break;
-        case CTRL_P:    /* ctrl-p */
-            linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
-            break;
-        case CTRL_N:    /* ctrl-n */
-            linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
-            break;
-        case ESC:    /* escape sequence */
-            /* Read the next two bytes representing the escape sequence.
-             * Use two calls to handle slow terminals returning the two
-             * chars at different times. */
-            if (read(l.ifd,seq,1) == -1) break;
-            if (read(l.ifd,seq+1,1) == -1) break;
-
-            /* ESC [ sequences. */
-            if (seq[0] == '[') {
-                if (seq[1] >= '0' && seq[1] <= '9') {
-                    /* Extended escape, read additional byte. */
-                    if (read(l.ifd,seq+2,1) == -1) break;
-                    if (seq[2] == '~') {
-                        switch(seq[1]) {
-                        case '3': /* Delete key. */
-                            linenoiseEditDelete(&l);
-                            break;
-                        }
-                    }
-                } else {
-                    switch(seq[1]) {
-                    case 'A': /* Up */
-                        linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
-                        break;
-                    case 'B': /* Down */
-                        linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
-                        break;
-                    case 'C': /* Right */
-                        linenoiseEditMoveRight(&l);
-                        break;
-                    case 'D': /* Left */
-                        linenoiseEditMoveLeft(&l);
-                        break;
-                    case 'H': /* Home */
-                        linenoiseEditMoveHome(&l);
-                        break;
-                    case 'F': /* End*/
-                        linenoiseEditMoveEnd(&l);
-                        break;
-                    }
-                }
-            }
-
-            /* ESC O sequences. */
-            else if (seq[0] == 'O') {
-                switch(seq[1]) {
-                case 'H': /* Home */
-                    linenoiseEditMoveHome(&l);
-                    break;
-                case 'F': /* End*/
-                    linenoiseEditMoveEnd(&l);
-                    break;
-                }
-            }
-            break;
-        default:
-            if (linenoiseEditInsert(&l,c)) return -1;
-            break;
-        case CTRL_U: /* Ctrl+u, delete the whole line. */
-            buf[0] = '\0';
-            l.pos = l.len = 0;
-            refreshLine(&l);
-            break;
-        case CTRL_K: /* Ctrl+k, delete from current to end of line. */
-            buf[l.pos] = '\0';
-            l.len = l.pos;
-            refreshLine(&l);
-            break;
-        case CTRL_A: /* Ctrl+a, go to the start of the line */
-            linenoiseEditMoveHome(&l);
-            break;
-        case CTRL_E: /* ctrl+e, go to the end of the line */
-            linenoiseEditMoveEnd(&l);
-            break;
-        case CTRL_L: /* ctrl+l, clear screen */
-            linenoiseClearScreen();
-            refreshLine(&l);
-            break;
-        case CTRL_W: /* ctrl+w, delete previous word */
-            linenoiseEditDeletePrevWord(&l);
-            break;
-        }
-    }
-    return l.len;
-}
-
-/* This special mode is used by linenoise in order to print scan codes
- * on screen for debugging / development purposes. It is implemented
- * by the linenoise_example program using the --keycodes option. */
-void linenoisePrintKeyCodes(void) {
-    char quit[4];
-
-    printf("Linenoise key codes debugging mode.\n"
-            "Press keys to see scan codes. Type 'quit' at any time to exit.\n");
-    if (enableRawMode(STDIN_FILENO) == -1) return;
-    memset(quit,' ',4);
-    while(1) {
-        char c;
-        int nread;
-
-        nread = read(STDIN_FILENO,&c,1);
-        if (nread <= 0) continue;
-        memmove(quit,quit+1,sizeof(quit)-1); /* shift string to left. */
-        quit[sizeof(quit)-1] = c; /* Insert current char on the right. */
-        if (memcmp(quit,"quit",sizeof(quit)) == 0) break;
-
-        printf("'%c' %02x (%d) (type quit to exit)\n",
-            isprint(c) ? c : '?', (int)c, (int)c);
-        printf("\r"); /* Go left edge manually, we are in raw mode. */
-        fflush(stdout);
-    }
-    disableRawMode(STDIN_FILENO);
-}
-
-/* This function calls the line editing function linenoiseEdit() using
- * the STDIN file descriptor set in raw mode. */
-static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) {
-    int count;
-
-    if (buflen == 0) {
-        errno = EINVAL;
-        return -1;
-    }
-
-    if (enableRawMode(STDIN_FILENO) == -1) return -1;
-    count = linenoiseEdit(STDIN_FILENO, STDOUT_FILENO, buf, buflen, prompt);
-    disableRawMode(STDIN_FILENO);
-    printf("\n");
-    return count;
-}
-
-/* This function is called when linenoise() is called with the standard
- * input file descriptor not attached to a TTY. So for example when the
- * program using linenoise is called in pipe or with a file redirected
- * to its standard input. In this case, we want to be able to return the
- * line regardless of its length (by default we are limited to 4k). */
-static char *linenoiseNoTTY(void) {
-    char *line = NULL;
-    size_t len = 0, maxlen = 0;
-
-    while(1) {
-        if (len == maxlen) {
-            if (maxlen == 0) maxlen = 16;
-            maxlen *= 2;
-            char *oldval = line;
-            line = realloc(line,maxlen);
-            if (line == NULL) {
-                if (oldval) free(oldval);
-                return NULL;
-            }
-        }
-        int c = fgetc(stdin);
-        if (c == EOF || c == '\n') {
-            if (c == EOF && len == 0) {
-                free(line);
-                return NULL;
-            } else {
-                line[len] = '\0';
-                return line;
-            }
-        } else {
-            line[len] = c;
-            len++;
-        }
-    }
-}
-
-/* The high level function that is the main API of the linenoise library.
- * This function checks if the terminal has basic capabilities, just checking
- * for a blacklist of stupid terminals, and later either calls the line
- * editing function or uses dummy fgets() so that you will be able to type
- * something even in the most desperate of the conditions. */
-char *linenoise(const char *prompt) {
-    char buf[LINENOISE_MAX_LINE];
-    int count;
-
-    if (!isatty(STDIN_FILENO)) {
-        /* Not a tty: read from file / pipe. In this mode we don't want any
-         * limit to the line size, so we call a function to handle that. */
-        return linenoiseNoTTY();
-    } else if (isUnsupportedTerm()) {
-        size_t len;
-
-        printf("%s",prompt);
-        fflush(stdout);
-        if (fgets(buf,LINENOISE_MAX_LINE,stdin) == NULL) return NULL;
-        len = strlen(buf);
-        while(len && (buf[len-1] == '\n' || buf[len-1] == '\r')) {
-            len--;
-            buf[len] = '\0';
-        }
-        return strdup(buf);
-    } else {
-        count = linenoiseRaw(buf,LINENOISE_MAX_LINE,prompt);
-        if (count == -1) return NULL;
-        return strdup(buf);
-    }
-}
-
-/* This is just a wrapper the user may want to call in order to make sure
- * the linenoise returned buffer is freed with the same allocator it was
- * created with. Useful when the main program is using an alternative
- * allocator. */
-void linenoiseFree(void *ptr) {
-    free(ptr);
-}
-
-/* ================================ History ================================= */
-
-/* Free the history, but does not reset it. Only used when we have to
- * exit() to avoid memory leaks are reported by valgrind & co. */
-static void freeHistory(void) {
-    if (history) {
-        int j;
-
-        for (j = 0; j < history_len; j++)
-            free(history[j]);
-        free(history);
-    }
-}
-
-/* At exit we'll try to fix the terminal to the initial conditions. */
-static void linenoiseAtExit(void) {
-    disableRawMode(STDIN_FILENO);
-    freeHistory();
-}
-
-/* This is the API call to add a new entry in the linenoise history.
- * It uses a fixed array of char pointers that are shifted (memmoved)
- * when the history max length is reached in order to remove the older
- * entry and make room for the new one, so it is not exactly suitable for huge
- * histories, but will work well for a few hundred of entries.
- *
- * Using a circular buffer is smarter, but a bit more complex to handle. */
-int linenoiseHistoryAdd(const char *line) {
-    char *linecopy;
-
-    if (history_max_len == 0) return 0;
-
-    /* Initialization on first call. */
-    if (history == NULL) {
-        history = malloc(sizeof(char*)*history_max_len);
-        if (history == NULL) return 0;
-        memset(history,0,(sizeof(char*)*history_max_len));
-    }
-
-    /* Don't add duplicated lines. */
-    if (history_len && !strcmp(history[history_len-1], line)) return 0;
-
-    /* Add an heap allocated copy of the line in the history.
-     * If we reached the max length, remove the older line. */
-    linecopy = strdup(line);
-    if (!linecopy) return 0;
-    if (history_len == history_max_len) {
-        free(history[0]);
-        memmove(history,history+1,sizeof(char*)*(history_max_len-1));
-        history_len--;
-    }
-    history[history_len] = linecopy;
-    history_len++;
-    return 1;
-}
-
-/* Set the maximum length for the history. This function can be called even
- * if there is already some history, the function will make sure to retain
- * just the latest 'len' elements if the new history length value is smaller
- * than the amount of items already inside the history. */
-int linenoiseHistorySetMaxLen(int len) {
-    char **new;
-
-    if (len < 1) return 0;
-    if (history) {
-        int tocopy = history_len;
-
-        new = malloc(sizeof(char*)*len);
-        if (new == NULL) return 0;
-
-        /* If we can't copy everything, free the elements we'll not use. */
-        if (len < tocopy) {
-            int j;
-
-            for (j = 0; j < tocopy-len; j++) free(history[j]);
-            tocopy = len;
-        }
-        memset(new,0,sizeof(char*)*len);
-        memcpy(new,history+(history_len-tocopy), sizeof(char*)*tocopy);
-        free(history);
-        history = new;
-    }
-    history_max_len = len;
-    if (history_len > history_max_len)
-        history_len = history_max_len;
-    return 1;
-}
-
-/* Save the history in the specified file. On success 0 is returned
- * otherwise -1 is returned. */
-int linenoiseHistorySave(const char *filename) {
-    mode_t old_umask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
-    FILE *fp;
-    int j;
-
-    fp = fopen(filename,"w");
-    umask(old_umask);
-    if (fp == NULL) return -1;
-    chmod(filename,S_IRUSR|S_IWUSR);
-    for (j = 0; j < history_len; j++)
-        fprintf(fp,"%s\n",history[j]);
-    fclose(fp);
-    return 0;
-}
-
-/* Load the history from the specified file. If the file does not exist
- * zero is returned and no operation is performed.
- *
- * If the file exists and the operation succeeded 0 is returned, otherwise
- * on error -1 is returned. */
-int linenoiseHistoryLoad(const char *filename) {
-    FILE *fp = fopen(filename,"r");
-    char buf[LINENOISE_MAX_LINE];
-
-    if (fp == NULL) return -1;
-
-    while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) {
-        char *p;
-
-        p = strchr(buf,'\r');
-        if (!p) p = strchr(buf,'\n');
-        if (p) *p = '\0';
-        linenoiseHistoryAdd(buf);
-    }
-    fclose(fp);
-    return 0;
-}
diff --git a/src/linenoise/linenoise.cpp b/src/linenoise/linenoise.cpp
new file mode 100644
index 000000000..8ee8984d6
--- /dev/null
+++ b/src/linenoise/linenoise.cpp
@@ -0,0 +1,3457 @@
+/* linenoise.c -- guerrilla line editing library against the idea that a
+ * line editing lib needs to be 20,000 lines of C code.
+ *
+ * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * line editing lib needs to be 20,000 lines of C code.
+ *
+ * You can find the latest source code at:
+ *
+ *   http://github.com/antirez/linenoise
+ *
+ * Does a number of crazy assumptions that happen to be true in 99.9999% of
+ * the 2010 UNIX computers around.
+ *
+ * References:
+ * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+ * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
+ *
+ * Todo list:
+ * - Switch to gets() if $TERM is something we can't support.
+ * - Filter bogus Ctrl+<char> combinations.
+ * - Win32 support
+ *
+ * Bloat:
+ * - Completion?
+ * - History search like Ctrl+r in readline?
+ *
+ * List of escape sequences used by this program, we do everything just
+ * with three sequences. In order to be so cheap we may have some
+ * flickering effect with some slow terminal, but the lesser sequences
+ * the more compatible.
+ *
+ * CHA (Cursor Horizontal Absolute)
+ *    Sequence: ESC [ n G
+ *    Effect: moves cursor to column n (1 based)
+ *
+ * EL (Erase Line)
+ *    Sequence: ESC [ n K
+ *    Effect: if n is 0 or missing, clear from cursor to end of line
+ *    Effect: if n is 1, clear from beginning of line to cursor
+ *    Effect: if n is 2, clear entire line
+ *
+ * CUF (Cursor Forward)
+ *    Sequence: ESC [ n C
+ *    Effect: moves cursor forward of n chars
+ *
+ * The following are used to clear the screen: ESC [ H ESC [ 2 J
+ * This is actually composed of two sequences:
+ *
+ * cursorhome
+ *    Sequence: ESC [ H
+ *    Effect: moves the cursor to upper left corner
+ *
+ * ED2 (Clear entire screen)
+ *    Sequence: ESC [ 2 J
+ *    Effect: clear the whole screen
+ *
+ */
+
+#ifdef _WIN32
+
+#include <conio.h>
+#include <windows.h>
+#include <io.h>
+
+#if defined(_MSC_VER) && _MSC_VER < 1900
+#define snprintf _snprintf  // Microsoft headers use underscores in some names
+#endif
+
+#if !defined GNUC
+#define strcasecmp _stricmp
+#endif
+
+#define strdup _strdup
+#define isatty _isatty
+#define write _write
+#define STDIN_FILENO 0
+
+#else /* _WIN32 */
+
+#include <signal.h>
+#include <termios.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <cctype>
+#include <wctype.h>
+
+#endif /* _WIN32 */
+
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+
+#include "linenoise.h"
+#include "ConvertUTF.h"
+
+#include <string>
+#include <vector>
+#include <memory>
+
+using std::string;
+using std::vector;
+using std::unique_ptr;
+using namespace linenoise_ng;
+
+typedef unsigned char char8_t;
+
+static ConversionResult copyString8to32(char32_t* dst, size_t dstSize,
+                                        size_t& dstCount, const char* src) {
+  const UTF8* sourceStart = reinterpret_cast<const UTF8*>(src);
+  const UTF8* sourceEnd = sourceStart + strlen(src);
+  UTF32* targetStart = reinterpret_cast<UTF32*>(dst);
+  UTF32* targetEnd = targetStart + dstSize;
+
+  ConversionResult res = ConvertUTF8toUTF32(
+      &sourceStart, sourceEnd, &targetStart, targetEnd, lenientConversion);
+
+  if (res == conversionOK) {
+    dstCount = targetStart - reinterpret_cast<UTF32*>(dst);
+
+    if (dstCount < dstSize) {
+      *targetStart = 0;
+    }
+  }
+
+  return res;
+}
+
+static ConversionResult copyString8to32(char32_t* dst, size_t dstSize,
+                                        size_t& dstCount, const char8_t* src) {
+  return copyString8to32(dst, dstSize, dstCount,
+                         reinterpret_cast<const char*>(src));
+}
+
+static size_t strlen32(const char32_t* str) {
+  const char32_t* ptr = str;
+
+  while (*ptr) {
+    ++ptr;
+  }
+
+  return ptr - str;
+}
+
+static size_t strlen8(const char8_t* str) {
+  return strlen(reinterpret_cast<const char*>(str));
+}
+
+static char8_t* strdup8(const char* src) {
+  return reinterpret_cast<char8_t*>(strdup(src));
+}
+
+#ifdef _WIN32
+static const int FOREGROUND_WHITE =
+    FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
+static const int BACKGROUND_WHITE =
+    BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE;
+static const int INTENSITY = FOREGROUND_INTENSITY | BACKGROUND_INTENSITY;
+
+class WinAttributes {
+ public:
+  WinAttributes() {
+    CONSOLE_SCREEN_BUFFER_INFO info;
+    GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &info);
+    _defaultAttribute = info.wAttributes & INTENSITY;
+    _defaultColor = info.wAttributes & FOREGROUND_WHITE;
+    _defaultBackground = info.wAttributes & BACKGROUND_WHITE;
+
+    _consoleAttribute = _defaultAttribute;
+    _consoleColor = _defaultColor | _defaultBackground;
+  }
+
+ public:
+  int _defaultAttribute;
+  int _defaultColor;
+  int _defaultBackground;
+
+  int _consoleAttribute;
+  int _consoleColor;
+};
+
+static WinAttributes WIN_ATTR;
+
+static void copyString32to16(char16_t* dst, size_t dstSize, size_t* dstCount,
+                             const char32_t* src, size_t srcSize) {
+  const UTF32* sourceStart = reinterpret_cast<const UTF32*>(src);
+  const UTF32* sourceEnd = sourceStart + srcSize;
+  char16_t* targetStart = reinterpret_cast<char16_t*>(dst);
+  char16_t* targetEnd = targetStart + dstSize;
+
+  ConversionResult res = ConvertUTF32toUTF16(
+      &sourceStart, sourceEnd, &targetStart, targetEnd, lenientConversion);
+
+  if (res == conversionOK) {
+    *dstCount = targetStart - reinterpret_cast<char16_t*>(dst);
+
+    if (*dstCount < dstSize) {
+      *targetStart = 0;
+    }
+  }
+}
+#endif
+
+static void copyString32to8(char* dst, size_t dstSize, size_t* dstCount,
+                            const char32_t* src, size_t srcSize) {
+  const UTF32* sourceStart = reinterpret_cast<const UTF32*>(src);
+  const UTF32* sourceEnd = sourceStart + srcSize;
+  UTF8* targetStart = reinterpret_cast<UTF8*>(dst);
+  UTF8* targetEnd = targetStart + dstSize;
+
+  ConversionResult res = ConvertUTF32toUTF8(
+      &sourceStart, sourceEnd, &targetStart, targetEnd, lenientConversion);
+
+  if (res == conversionOK) {
+    *dstCount = targetStart - reinterpret_cast<UTF8*>(dst);
+
+    if (*dstCount < dstSize) {
+      *targetStart = 0;
+    }
+  }
+}
+
+static void copyString32to8(char* dst, size_t dstLen, const char32_t* src) {
+  size_t dstCount = 0;
+  copyString32to8(dst, dstLen, &dstCount, src, strlen32(src));
+}
+
+static void copyString32(char32_t* dst, const char32_t* src, size_t len) {
+  while (0 < len && *src) {
+    *dst++ = *src++;
+    --len;
+  }
+
+  *dst = 0;
+}
+
+static int strncmp32(const char32_t* left, const char32_t* right, size_t len) {
+  while (0 < len && *left) {
+    if (*left != *right) {
+      return *left - *right;
+    }
+
+    ++left;
+    ++right;
+    --len;
+  }
+
+  return 0;
+}
+
+#ifdef _WIN32
+#include <iostream>
+
+static size_t OutputWin(char16_t* text16, char32_t* text32, size_t len32) {
+  size_t count16 = 0;
+
+  copyString32to16(text16, len32, &count16, text32, len32);
+  WriteConsoleW(GetStdHandle(STD_OUTPUT_HANDLE), text16,
+                static_cast<DWORD>(count16), nullptr, nullptr);
+
+  return count16;
+}
+
+static char32_t* HandleEsc(char32_t* p, char32_t* end) {
+  if (*p == '[') {
+    int code = 0;
+
+    for (++p; p < end; ++p) {
+      char32_t c = *p;
+
+      if ('0' <= c && c <= '9') {
+        code = code * 10 + (c - '0');
+      } else if (c == 'm' || c == ';') {
+        switch (code) {
+          case 0:
+            WIN_ATTR._consoleAttribute = WIN_ATTR._defaultAttribute;
+            WIN_ATTR._consoleColor =
+                WIN_ATTR._defaultColor | WIN_ATTR._defaultBackground;
+            break;
+
+          case 1:  // BOLD
+          case 5:  // BLINK
+            WIN_ATTR._consoleAttribute =
+                (WIN_ATTR._defaultAttribute ^ FOREGROUND_INTENSITY) & INTENSITY;
+            break;
+
+          case 30:
+            WIN_ATTR._consoleColor = BACKGROUND_WHITE;
+            break;
+
+          case 31:
+            WIN_ATTR._consoleColor =
+                FOREGROUND_RED | WIN_ATTR._defaultBackground;
+            break;
+
+          case 32:
+            WIN_ATTR._consoleColor =
+                FOREGROUND_GREEN | WIN_ATTR._defaultBackground;
+            break;
+
+          case 33:
+            WIN_ATTR._consoleColor =
+                FOREGROUND_RED | FOREGROUND_GREEN | WIN_ATTR._defaultBackground;
+            break;
+
+          case 34:
+            WIN_ATTR._consoleColor =
+                FOREGROUND_BLUE | WIN_ATTR._defaultBackground;
+            break;
+
+          case 35:
+            WIN_ATTR._consoleColor =
+                FOREGROUND_BLUE | FOREGROUND_RED | WIN_ATTR._defaultBackground;
+            break;
+
+          case 36:
+            WIN_ATTR._consoleColor = FOREGROUND_BLUE | FOREGROUND_GREEN |
+                                     WIN_ATTR._defaultBackground;
+            break;
+
+          case 37:
+            WIN_ATTR._consoleColor = FOREGROUND_GREEN | FOREGROUND_RED |
+                                     FOREGROUND_BLUE |
+                                     WIN_ATTR._defaultBackground;
+            break;
+        }
+
+        code = 0;
+      }
+
+      if (*p == 'm') {
+        ++p;
+        break;
+      }
+    }
+  } else {
+    ++p;
+  }
+
+  auto handle = GetStdHandle(STD_OUTPUT_HANDLE);
+  SetConsoleTextAttribute(handle,
+                          WIN_ATTR._consoleAttribute | WIN_ATTR._consoleColor);
+
+  return p;
+}
+
+static size_t WinWrite32(char16_t* text16, char32_t* text32, size_t len32) {
+  char32_t* p = text32;
+  char32_t* q = p;
+  char32_t* e = text32 + len32;
+  size_t count16 = 0;
+
+  while (p < e) {
+    if (*p == 27) {
+      if (q < p) {
+        count16 += OutputWin(text16, q, p - q);
+      }
+
+      q = p = HandleEsc(p + 1, e);
+    } else {
+      ++p;
+    }
+  }
+
+  if (q < p) {
+    count16 += OutputWin(text16, q, p - q);
+  }
+
+  return count16;
+}
+#endif
+
+static int write32(int fd, char32_t* text32, int len32) {
+#ifdef _WIN32
+  if (isatty(fd)) {
+    size_t len16 = 2 * len32 + 1;
+    unique_ptr<char16_t[]> text16(new char16_t[len16]);
+    size_t count16 = WinWrite32(text16.get(), text32, len32);
+
+    return static_cast<int>(count16);
+  } else {
+    size_t len8 = 4 * len32 + 1;
+    unique_ptr<char[]> text8(new char[len8]);
+    size_t count8 = 0;
+
+    copyString32to8(text8.get(), len8, &count8, text32, len32);
+
+    return write(fd, text8.get(), static_cast<unsigned int>(count8));
+  }
+#else
+  size_t len8 = 4 * len32 + 1;
+  unique_ptr<char[]> text8(new char[len8]);
+  size_t count8 = 0;
+
+  copyString32to8(text8.get(), len8, &count8, text32, len32);
+
+  return write(fd, text8.get(), count8);
+#endif
+}
+
+class Utf32String {
+ public:
+  Utf32String() : _length(0), _data(nullptr) { 
+    // note: parens intentional, _data must be properly initialized
+    _data = new char32_t[1](); 
+  }
+
+  explicit Utf32String(const char* src) : _length(0), _data(nullptr) {
+    size_t len = strlen(src);
+    // note: parens intentional, _data must be properly initialized
+    _data = new char32_t[len + 1]();
+    copyString8to32(_data, len + 1, _length, src);
+  }
+
+  explicit Utf32String(const char8_t* src) : _length(0), _data(nullptr) {
+    size_t len = strlen(reinterpret_cast<const char*>(src));
+    // note: parens intentional, _data must be properly initialized
+    _data = new char32_t[len + 1]();
+    copyString8to32(_data, len + 1, _length, src);
+  }
+
+  explicit Utf32String(const char32_t* src) : _length(0), _data(nullptr) {
+    for (_length = 0; src[_length] != 0; ++_length) {
+    }
+
+    // note: parens intentional, _data must be properly initialized
+    _data = new char32_t[_length + 1]();
+    memcpy(_data, src, _length * sizeof(char32_t));
+  }
+
+  explicit Utf32String(const char32_t* src, int len) : _length(len), _data(nullptr) {
+    // note: parens intentional, _data must be properly initialized
+    _data = new char32_t[len + 1]();
+    memcpy(_data, src, len * sizeof(char32_t));
+  }
+
+  explicit Utf32String(int len) : _length(0), _data(nullptr) { 
+    // note: parens intentional, _data must be properly initialized
+    _data = new char32_t[len](); 
+  }
+
+  explicit Utf32String(const Utf32String& that) : _length(that._length), _data(nullptr) {
+    // note: parens intentional, _data must be properly initialized
+    _data = new char32_t[_length + 1]();
+    memcpy(_data, that._data, sizeof(char32_t) * _length);
+  }
+
+  Utf32String& operator=(const Utf32String& that) {
+    if (this != &that) {
+      delete[] _data;
+      _data = new char32_t[that._length]();
+      _length = that._length;
+      memcpy(_data, that._data, sizeof(char32_t) * _length);
+    }
+
+    return *this;
+  }
+
+  ~Utf32String() { delete[] _data; }
+
+ public:
+  char32_t* get() const { return _data; }
+
+  size_t length() const { return _length; }
+
+  size_t chars() const { return _length; }
+
+  void initFromBuffer() {
+    for (_length = 0; _data[_length] != 0; ++_length) {
+    }
+  }
+
+  const char32_t& operator[](size_t pos) const { return _data[pos]; }
+
+  char32_t& operator[](size_t pos) { return _data[pos]; }
+
+ private:
+  size_t _length;
+  char32_t* _data;
+};
+
+class Utf8String {
+  Utf8String(const Utf8String&) = delete;
+  Utf8String& operator=(const Utf8String&) = delete;
+
+ public:
+  explicit Utf8String(const Utf32String& src) {
+    size_t len = src.length() * 4 + 1;
+    _data = new char[len];
+    copyString32to8(_data, len, src.get());
+  }
+
+  ~Utf8String() { delete[] _data; }
+
+ public:
+  char* get() const { return _data; }
+
+ private:
+  char* _data;
+};
+
+struct linenoiseCompletions {
+  vector<Utf32String> completionStrings;
+};
+
+#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
+#define LINENOISE_MAX_LINE 4096
+
+// make control-characters more readable
+#define ctrlChar(upperCaseASCII) (upperCaseASCII - 0x40)
+
+/**
+ * Recompute widths of all characters in a char32_t buffer
+ * @param text          input buffer of Unicode characters
+ * @param widths        output buffer of character widths
+ * @param charCount     number of characters in buffer
+ */
+namespace linenoise_ng {
+int mk_wcwidth(char32_t ucs);
+}
+
+static void recomputeCharacterWidths(const char32_t* text, char* widths,
+                                     int charCount) {
+  for (int i = 0; i < charCount; ++i) {
+    widths[i] = mk_wcwidth(text[i]);
+  }
+}
+
+/**
+ * Calculate a new screen position given a starting position, screen width and
+ * character count
+ * @param x             initial x position (zero-based)
+ * @param y             initial y position (zero-based)
+ * @param screenColumns screen column count
+ * @param charCount     character positions to advance
+ * @param xOut          returned x position (zero-based)
+ * @param yOut          returned y position (zero-based)
+ */
+static void calculateScreenPosition(int x, int y, int screenColumns,
+                                    int charCount, int& xOut, int& yOut) {
+  xOut = x;
+  yOut = y;
+  int charsRemaining = charCount;
+  while (charsRemaining > 0) {
+    int charsThisRow = (x + charsRemaining < screenColumns) ? charsRemaining
+                                                            : screenColumns - x;
+    xOut = x + charsThisRow;
+    yOut = y;
+    charsRemaining -= charsThisRow;
+    x = 0;
+    ++y;
+  }
+  if (xOut == screenColumns) {  // we have to special-case line wrap
+    xOut = 0;
+    ++yOut;
+  }
+}
+
+/**
+ * Calculate a column width using mk_wcswidth()
+ * @param buf32  text to calculate
+ * @param len    length of text to calculate
+ */
+namespace linenoise_ng {
+int mk_wcswidth(const char32_t* pwcs, size_t n);
+}
+
+static int calculateColumnPosition(char32_t* buf32, int len) {
+  int width = mk_wcswidth(reinterpret_cast<const char32_t*>(buf32), len);
+  if (width == -1)
+    return len;
+  else
+    return width;
+}
+
+static bool isControlChar(char32_t testChar) {
+  return (testChar < ' ') ||                      // C0 controls
+         (testChar >= 0x7F && testChar <= 0x9F);  // DEL and C1 controls
+}
+
+struct PromptBase {            // a convenience struct for grouping prompt info
+  Utf32String promptText;      // our copy of the prompt text, edited
+  char* promptCharWidths;      // character widths from mk_wcwidth()
+  int promptChars;             // chars in promptText
+  int promptBytes;             // bytes in promptText
+  int promptExtraLines;        // extra lines (beyond 1) occupied by prompt
+  int promptIndentation;       // column offset to end of prompt
+  int promptLastLinePosition;  // index into promptText where last line begins
+  int promptPreviousInputLen;  // promptChars of previous input line, for
+                               // clearing
+  int promptCursorRowOffset;   // where the cursor is relative to the start of
+                               // the prompt
+  int promptScreenColumns;     // width of screen in columns
+  int promptPreviousLen;       // help erasing
+  int promptErrorCode;         // error code (invalid UTF-8) or zero
+
+  PromptBase() : promptPreviousInputLen(0) {}
+
+  bool write() {
+    if (write32(1, promptText.get(), promptBytes) == -1) return false;
+
+    return true;
+  }
+};
+
+struct PromptInfo : public PromptBase {
+  PromptInfo(const char* textPtr, int columns) {
+    promptExtraLines = 0;
+    promptLastLinePosition = 0;
+    promptPreviousLen = 0;
+    promptScreenColumns = columns;
+    Utf32String tempUnicode(textPtr);
+
+    // strip control characters from the prompt -- we do allow newline
+    char32_t* pIn = tempUnicode.get();
+    char32_t* pOut = pIn;
+
+    int len = 0;
+    int x = 0;
+
+    bool const strip = (isatty(1) == 0);
+
+    while (*pIn) {
+      char32_t c = *pIn;
+      if ('\n' == c || !isControlChar(c)) {
+        *pOut = c;
+        ++pOut;
+        ++pIn;
+        ++len;
+        if ('\n' == c || ++x >= promptScreenColumns) {
+          x = 0;
+          ++promptExtraLines;
+          promptLastLinePosition = len;
+        }
+      } else if (c == '\x1b') {
+        if (strip) {
+          // jump over control chars
+          ++pIn;
+          if (*pIn == '[') {
+            ++pIn;
+            while (*pIn && ((*pIn == ';') || ((*pIn >= '0' && *pIn <= '9')))) {
+              ++pIn;
+            }
+            if (*pIn == 'm') {
+              ++pIn;
+            }
+          }
+        } else {
+          // copy control chars
+          *pOut = *pIn;
+          ++pOut;
+          ++pIn;
+          if (*pIn == '[') {
+            *pOut = *pIn;
+            ++pOut;
+            ++pIn;
+            while (*pIn && ((*pIn == ';') || ((*pIn >= '0' && *pIn <= '9')))) {
+              *pOut = *pIn;
+              ++pOut;
+              ++pIn;
+            }
+            if (*pIn == 'm') {
+              *pOut = *pIn;
+              ++pOut;
+              ++pIn;
+            }
+          }
+        }
+      } else {
+        ++pIn;
+      }
+    }
+    *pOut = 0;
+    promptChars = len;
+    promptBytes = static_cast<int>(pOut - tempUnicode.get());
+    promptText = tempUnicode;
+
+    promptIndentation = len - promptLastLinePosition;
+    promptCursorRowOffset = promptExtraLines;
+  }
+};
+
+// Used with DynamicPrompt (history search)
+//
+static const Utf32String forwardSearchBasePrompt("(i-search)`");
+static const Utf32String reverseSearchBasePrompt("(reverse-i-search)`");
+static const Utf32String endSearchBasePrompt("': ");
+static Utf32String
+    previousSearchText;  // remembered across invocations of linenoise()
+
+// changing prompt for "(reverse-i-search)`text':" etc.
+//
+struct DynamicPrompt : public PromptBase {
+  Utf32String searchText;  // text we are searching for
+  char* searchCharWidths;  // character widths from mk_wcwidth()
+  int searchTextLen;       // chars in searchText
+  int direction;           // current search direction, 1=forward, -1=reverse
+
+  DynamicPrompt(PromptBase& pi, int initialDirection)
+      : searchTextLen(0), direction(initialDirection) {
+    promptScreenColumns = pi.promptScreenColumns;
+    promptCursorRowOffset = 0;
+    Utf32String emptyString(1);
+    searchText = emptyString;
+    const Utf32String* basePrompt =
+        (direction > 0) ? &forwardSearchBasePrompt : &reverseSearchBasePrompt;
+    size_t promptStartLength = basePrompt->length();
+    promptChars =
+        static_cast<int>(promptStartLength + endSearchBasePrompt.length());
+    promptBytes = promptChars;
+    promptLastLinePosition = promptChars;  // TODO fix this, we are asssuming
+                                           // that the history prompt won't wrap
+                                           // (!)
+    promptPreviousLen = promptChars;
+    Utf32String tempUnicode(promptChars + 1);
+    memcpy(tempUnicode.get(), basePrompt->get(),
+           sizeof(char32_t) * promptStartLength);
+    memcpy(&tempUnicode[promptStartLength], endSearchBasePrompt.get(),
+           sizeof(char32_t) * (endSearchBasePrompt.length() + 1));
+    tempUnicode.initFromBuffer();
+    promptText = tempUnicode;
+    calculateScreenPosition(0, 0, pi.promptScreenColumns, promptChars,
+                            promptIndentation, promptExtraLines);
+  }
+
+  void updateSearchPrompt(void) {
+    const Utf32String* basePrompt =
+        (direction > 0) ? &forwardSearchBasePrompt : &reverseSearchBasePrompt;
+    size_t promptStartLength = basePrompt->length();
+    promptChars = static_cast<int>(promptStartLength + searchTextLen +
+                                   endSearchBasePrompt.length());
+    promptBytes = promptChars;
+    Utf32String tempUnicode(promptChars + 1);
+    memcpy(tempUnicode.get(), basePrompt->get(),
+           sizeof(char32_t) * promptStartLength);
+    memcpy(&tempUnicode[promptStartLength], searchText.get(),
+           sizeof(char32_t) * searchTextLen);
+    size_t endIndex = promptStartLength + searchTextLen;
+    memcpy(&tempUnicode[endIndex], endSearchBasePrompt.get(),
+           sizeof(char32_t) * (endSearchBasePrompt.length() + 1));
+    tempUnicode.initFromBuffer();
+    promptText = tempUnicode;
+  }
+
+  void updateSearchText(const char32_t* textPtr) {
+    Utf32String tempUnicode(textPtr);
+    searchTextLen = static_cast<int>(tempUnicode.chars());
+    searchText = tempUnicode;
+    updateSearchPrompt();
+  }
+};
+
+class KillRing {
+  static const int capacity = 10;
+  int size;
+  int index;
+  char indexToSlot[10];
+  vector<Utf32String> theRing;
+
+ public:
+  enum action { actionOther, actionKill, actionYank };
+  action lastAction;
+  size_t lastYankSize;
+
+  KillRing() : size(0), index(0), lastAction(actionOther) {
+    theRing.reserve(capacity);
+  }
+
+  void kill(const char32_t* text, int textLen, bool forward) {
+    if (textLen == 0) {
+      return;
+    }
+    Utf32String killedText(text, textLen);
+    if (lastAction == actionKill && size > 0) {
+      int slot = indexToSlot[0];
+      int currentLen = static_cast<int>(theRing[slot].length());
+      int resultLen = currentLen + textLen;
+      Utf32String temp(resultLen + 1);
+      if (forward) {
+        memcpy(temp.get(), theRing[slot].get(), currentLen * sizeof(char32_t));
+        memcpy(&temp[currentLen], killedText.get(), textLen * sizeof(char32_t));
+      } else {
+        memcpy(temp.get(), killedText.get(), textLen * sizeof(char32_t));
+        memcpy(&temp[textLen], theRing[slot].get(),
+               currentLen * sizeof(char32_t));
+      }
+      temp[resultLen] = 0;
+      temp.initFromBuffer();
+      theRing[slot] = temp;
+    } else {
+      if (size < capacity) {
+        if (size > 0) {
+          memmove(&indexToSlot[1], &indexToSlot[0], size);
+        }
+        indexToSlot[0] = size;
+        size++;
+        theRing.push_back(killedText);
+      } else {
+        int slot = indexToSlot[capacity - 1];
+        theRing[slot] = killedText;
+        memmove(&indexToSlot[1], &indexToSlot[0], capacity - 1);
+        indexToSlot[0] = slot;
+      }
+      index = 0;
+    }
+  }
+
+  Utf32String* yank() { return (size > 0) ? &theRing[indexToSlot[index]] : 0; }
+
+  Utf32String* yankPop() {
+    if (size == 0) {
+      return 0;
+    }
+    ++index;
+    if (index == size) {
+      index = 0;
+    }
+    return &theRing[indexToSlot[index]];
+  }
+};
+
+class InputBuffer {
+  char32_t* buf32;   // input buffer
+  char* charWidths;  // character widths from mk_wcwidth()
+  int buflen;        // buffer size in characters
+  int len;           // length of text in input buffer
+  int pos;           // character position in buffer ( 0 <= pos <= len )
+
+  void clearScreen(PromptBase& pi);
+  int incrementalHistorySearch(PromptBase& pi, int startChar);
+  int completeLine(PromptBase& pi);
+  void refreshLine(PromptBase& pi);
+
+ public:
+  InputBuffer(char32_t* buffer, char* widthArray, int bufferLen)
+      : buf32(buffer),
+        charWidths(widthArray),
+        buflen(bufferLen - 1),
+        len(0),
+        pos(0) {
+    buf32[0] = 0;
+  }
+  void preloadBuffer(const char* preloadText) {
+    size_t ucharCount = 0;
+    copyString8to32(buf32, buflen + 1, ucharCount, preloadText);
+    recomputeCharacterWidths(buf32, charWidths, static_cast<int>(ucharCount));
+    len = static_cast<int>(ucharCount);
+    pos = static_cast<int>(ucharCount);
+  }
+  int getInputLine(PromptBase& pi);
+  int length(void) const { return len; }
+};
+
+// Special codes for keyboard input:
+//
+// Between Windows and the various Linux "terminal" programs, there is some
+// pretty diverse behavior in the "scan codes" and escape sequences we are
+// presented with.  So ... we'll translate them all into our own pidgin
+// pseudocode, trying to stay out of the way of UTF-8 and international
+// characters.  Here's the general plan.
+//
+// "User input keystrokes" (key chords, whatever) will be encoded as a single
+// value.
+// The low 21 bits are reserved for Unicode characters.  Popular function-type
+// keys
+// get their own codes in the range 0x10200000 to (if needed) 0x1FE00000,
+// currently
+// just arrow keys, Home, End and Delete.  Keypresses with Ctrl get ORed with
+// 0x20000000, with Alt get ORed with 0x40000000.  So, Ctrl+Alt+Home is encoded
+// as 0x20000000 + 0x40000000 + 0x10A00000 == 0x70A00000.  To keep things
+// complicated,
+// the Alt key is equivalent to prefixing the keystroke with ESC, so ESC
+// followed by
+// D is treated the same as Alt + D ... we'll just use Emacs terminology and
+// call
+// this "Meta".  So, we will encode both ESC followed by D and Alt held down
+// while D
+// is pressed the same, as Meta-D, encoded as 0x40000064.
+//
+// Here are the definitions of our component constants:
+//
+// Maximum unsigned 32-bit value    = 0xFFFFFFFF;   // For reference, max 32-bit
+// value
+// Highest allocated Unicode char   = 0x001FFFFF;   // For reference, max
+// Unicode value
+static const int META = 0x40000000;  // Meta key combination
+static const int CTRL = 0x20000000;  // Ctrl key combination
+// static const int SPECIAL_KEY = 0x10000000;   // Common bit for all special
+// keys
+static const int UP_ARROW_KEY = 0x10200000;  // Special keys
+static const int DOWN_ARROW_KEY = 0x10400000;
+static const int RIGHT_ARROW_KEY = 0x10600000;
+static const int LEFT_ARROW_KEY = 0x10800000;
+static const int HOME_KEY = 0x10A00000;
+static const int END_KEY = 0x10C00000;
+static const int DELETE_KEY = 0x10E00000;
+static const int PAGE_UP_KEY = 0x11000000;
+static const int PAGE_DOWN_KEY = 0x11200000;
+
+static const char* unsupported_term[] = {"dumb", "cons25", "emacs", NULL};
+static linenoiseCompletionCallback* completionCallback = NULL;
+
+#ifdef _WIN32
+static HANDLE console_in, console_out;
+static DWORD oldMode;
+static WORD oldDisplayAttribute;
+#else
+static struct termios orig_termios; /* in order to restore at exit */
+#endif
+
+static KillRing killRing;
+
+static int rawmode = 0; /* for atexit() function to check if restore is needed*/
+static int atexit_registered = 0; /* register atexit just 1 time */
+static int historyMaxLen = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
+static int historyLen = 0;
+static int historyIndex = 0;
+static char8_t** history = NULL;
+
+// used to emulate Windows command prompt on down-arrow after a recall
+// we use -2 as our "not set" value because we add 1 to the previous index on
+// down-arrow,
+// and zero is a valid index (so -1 is a valid "previous index")
+static int historyPreviousIndex = -2;
+static bool historyRecallMostRecent = false;
+
+static void linenoiseAtExit(void);
+
+static bool isUnsupportedTerm(void) {
+  char* term = getenv("TERM");
+  if (term == NULL) return false;
+  for (int j = 0; unsupported_term[j]; ++j)
+    if (!strcasecmp(term, unsupported_term[j])) {
+      return true;
+    }
+  return false;
+}
+
+static void beep() {
+  fprintf(stderr, "\x7");  // ctrl-G == bell/beep
+  fflush(stderr);
+}
+
+void linenoiseHistoryFree(void) {
+  if (history) {
+    for (int j = 0; j < historyLen; ++j) free(history[j]);
+    historyLen = 0;
+    free(history);
+    history = 0;
+  }
+}
+
+static int enableRawMode(void) {
+#ifdef _WIN32
+  if (!console_in) {
+    console_in = GetStdHandle(STD_INPUT_HANDLE);
+    console_out = GetStdHandle(STD_OUTPUT_HANDLE);
+
+    GetConsoleMode(console_in, &oldMode);
+    SetConsoleMode(console_in, oldMode &
+                                   ~(ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT |
+                                     ENABLE_PROCESSED_INPUT));
+  }
+  return 0;
+#else
+  struct termios raw;
+
+  if (!isatty(STDIN_FILENO)) goto fatal;
+  if (!atexit_registered) {
+    atexit(linenoiseAtExit);
+    atexit_registered = 1;
+  }
+  if (tcgetattr(0, &orig_termios) == -1) goto fatal;
+
+  raw = orig_termios; /* modify the original mode */
+  /* input modes: no break, no CR to NL, no parity check, no strip char,
+   * no start/stop output control. */
+  raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
+  /* output modes - disable post processing */
+  // this is wrong, we don't want raw output, it turns newlines into straight
+  // linefeeds
+  // raw.c_oflag &= ~(OPOST);
+  /* control modes - set 8 bit chars */
+  raw.c_cflag |= (CS8);
+  /* local modes - echoing off, canonical off, no extended functions,
+   * no signal chars (^Z,^C) */
+  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
+  /* control chars - set return condition: min number of bytes and timer.
+   * We want read to return every single byte, without timeout. */
+  raw.c_cc[VMIN] = 1;
+  raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
+
+  /* put terminal in raw mode after flushing */
+  if (tcsetattr(0, TCSADRAIN, &raw) < 0) goto fatal;
+  rawmode = 1;
+  return 0;
+
+fatal:
+  errno = ENOTTY;
+  return -1;
+#endif
+}
+
+static void disableRawMode(void) {
+#ifdef _WIN32
+  SetConsoleMode(console_in, oldMode);
+  console_in = 0;
+  console_out = 0;
+#else
+  if (rawmode && tcsetattr(0, TCSADRAIN, &orig_termios) != -1) rawmode = 0;
+#endif
+}
+
+// At exit we'll try to fix the terminal to the initial conditions
+static void linenoiseAtExit(void) { disableRawMode(); }
+
+static int getScreenColumns(void) {
+  int cols;
+#ifdef _WIN32
+  CONSOLE_SCREEN_BUFFER_INFO inf;
+  GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &inf);
+  cols = inf.dwSize.X;
+#else
+  struct winsize ws;
+  cols = (ioctl(1, TIOCGWINSZ, &ws) == -1) ? 80 : ws.ws_col;
+#endif
+  // cols is 0 in certain circumstances like inside debugger, which creates
+  // further issues
+  return (cols > 0) ? cols : 80;
+}
+
+static int getScreenRows(void) {
+  int rows;
+#ifdef _WIN32
+  CONSOLE_SCREEN_BUFFER_INFO inf;
+  GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &inf);
+  rows = 1 + inf.srWindow.Bottom - inf.srWindow.Top;
+#else
+  struct winsize ws;
+  rows = (ioctl(1, TIOCGWINSZ, &ws) == -1) ? 24 : ws.ws_row;
+#endif
+  return (rows > 0) ? rows : 24;
+}
+
+static void setDisplayAttribute(bool enhancedDisplay, bool error) {
+#ifdef _WIN32
+  if (enhancedDisplay) {
+    CONSOLE_SCREEN_BUFFER_INFO inf;
+    GetConsoleScreenBufferInfo(console_out, &inf);
+    oldDisplayAttribute = inf.wAttributes;
+    BYTE oldLowByte = oldDisplayAttribute & 0xFF;
+    BYTE newLowByte;
+    switch (oldLowByte) {
+      case 0x07:
+        // newLowByte = FOREGROUND_BLUE | FOREGROUND_INTENSITY;  // too dim
+        // newLowByte = FOREGROUND_BLUE;                         // even dimmer
+        newLowByte = FOREGROUND_BLUE |
+                     FOREGROUND_GREEN;  // most similar to xterm appearance
+        break;
+      case 0x70:
+        newLowByte = BACKGROUND_BLUE | BACKGROUND_INTENSITY;
+        break;
+      default:
+        newLowByte = oldLowByte ^ 0xFF;  // default to inverse video
+        break;
+    }
+    inf.wAttributes = (inf.wAttributes & 0xFF00) | newLowByte;
+    SetConsoleTextAttribute(console_out, inf.wAttributes);
+  } else {
+    SetConsoleTextAttribute(console_out, oldDisplayAttribute);
+  }
+#else
+  if (enhancedDisplay) {
+    char const* p = (error ? "\x1b[1;31m" : "\x1b[1;34m");
+    if (write(1, p, 7) == -1)
+      return; /* bright blue (visible with both B&W bg) */
+  } else {
+    if (write(1, "\x1b[0m", 4) == -1) return; /* reset */
+  }
+#endif
+}
+
+/**
+ * Display the dynamic incremental search prompt and the current user input
+ * line.
+ * @param pi   PromptBase struct holding information about the prompt and our
+ * screen position
+ * @param buf32  input buffer to be displayed
+ * @param len  count of characters in the buffer
+ * @param pos  current cursor position within the buffer (0 <= pos <= len)
+ */
+static void dynamicRefresh(PromptBase& pi, char32_t* buf32, int len, int pos) {
+  // calculate the position of the end of the prompt
+  int xEndOfPrompt, yEndOfPrompt;
+  calculateScreenPosition(0, 0, pi.promptScreenColumns, pi.promptChars,
+                          xEndOfPrompt, yEndOfPrompt);
+  pi.promptIndentation = xEndOfPrompt;
+
+  // calculate the position of the end of the input line
+  int xEndOfInput, yEndOfInput;
+  calculateScreenPosition(xEndOfPrompt, yEndOfPrompt, pi.promptScreenColumns,
+                          calculateColumnPosition(buf32, len), xEndOfInput,
+                          yEndOfInput);
+
+  // calculate the desired position of the cursor
+  int xCursorPos, yCursorPos;
+  calculateScreenPosition(xEndOfPrompt, yEndOfPrompt, pi.promptScreenColumns,
+                          calculateColumnPosition(buf32, pos), xCursorPos,
+                          yCursorPos);
+
+#ifdef _WIN32
+  // position at the start of the prompt, clear to end of previous input
+  CONSOLE_SCREEN_BUFFER_INFO inf;
+  GetConsoleScreenBufferInfo(console_out, &inf);
+  inf.dwCursorPosition.X = 0;
+  inf.dwCursorPosition.Y -= pi.promptCursorRowOffset /*- pi.promptExtraLines*/;
+  SetConsoleCursorPosition(console_out, inf.dwCursorPosition);
+  DWORD count;
+  FillConsoleOutputCharacterA(console_out, ' ',
+                              pi.promptPreviousLen + pi.promptPreviousInputLen,
+                              inf.dwCursorPosition, &count);
+  pi.promptPreviousLen = pi.promptIndentation;
+  pi.promptPreviousInputLen = len;
+
+  // display the prompt
+  if (!pi.write()) return;
+
+  // display the input line
+  if (write32(1, buf32, len) == -1) return;
+
+  // position the cursor
+  GetConsoleScreenBufferInfo(console_out, &inf);
+  inf.dwCursorPosition.X = xCursorPos;  // 0-based on Win32
+  inf.dwCursorPosition.Y -= yEndOfInput - yCursorPos;
+  SetConsoleCursorPosition(console_out, inf.dwCursorPosition);
+#else  // _WIN32
+  char seq[64];
+  int cursorRowMovement = pi.promptCursorRowOffset - pi.promptExtraLines;
+  if (cursorRowMovement > 0) {  // move the cursor up as required
+    snprintf(seq, sizeof seq, "\x1b[%dA", cursorRowMovement);
+    if (write(1, seq, strlen(seq)) == -1) return;
+  }
+  // position at the start of the prompt, clear to end of screen
+  snprintf(seq, sizeof seq, "\x1b[1G\x1b[J");  // 1-based on VT100
+  if (write(1, seq, strlen(seq)) == -1) return;
+
+  // display the prompt
+  if (!pi.write()) return;
+
+  // display the input line
+  if (write32(1, buf32, len) == -1) return;
+
+  // we have to generate our own newline on line wrap
+  if (xEndOfInput == 0 && yEndOfInput > 0)
+    if (write(1, "\n", 1) == -1) return;
+
+  // position the cursor
+  cursorRowMovement = yEndOfInput - yCursorPos;
+  if (cursorRowMovement > 0) {  // move the cursor up as required
+    snprintf(seq, sizeof seq, "\x1b[%dA", cursorRowMovement);
+    if (write(1, seq, strlen(seq)) == -1) return;
+  }
+  // position the cursor within the line
+  snprintf(seq, sizeof seq, "\x1b[%dG", xCursorPos + 1);  // 1-based on VT100
+  if (write(1, seq, strlen(seq)) == -1) return;
+#endif
+
+  pi.promptCursorRowOffset =
+      pi.promptExtraLines + yCursorPos;  // remember row for next pass
+}
+
+/**
+ * Refresh the user's input line: the prompt is already onscreen and is not
+ * redrawn here
+ * @param pi   PromptBase struct holding information about the prompt and our
+ * screen position
+ */
+void InputBuffer::refreshLine(PromptBase& pi) {
+  // check for a matching brace/bracket/paren, remember its position if found
+  int highlight = -1;
+  bool indicateError = false;
+  if (pos < len) {
+    /* this scans for a brace matching buf32[pos] to highlight */
+    unsigned char part1, part2;
+    int scanDirection = 0;
+    if (strchr("}])", buf32[pos])) {
+      scanDirection = -1; /* backwards */
+      if (buf32[pos] == '}') {
+        part1 = '}'; part2 = '{';
+      } else if (buf32[pos] == ']') {
+        part1 = ']'; part2 = '[';
+      } else {
+        part1 = ')'; part2 = '(';
+      }
+    }
+    else if (strchr("{[(", buf32[pos])) {
+      scanDirection = 1; /* forwards */
+      if (buf32[pos] == '{') {
+        //part1 = '{'; part2 = '}';
+        part1 = '}'; part2 = '{';
+      } else if (buf32[pos] == '[') {
+        //part1 = '['; part2 = ']';
+        part1 = ']'; part2 = '[';
+      } else {
+        //part1 = '('; part2 = ')';
+        part1 = ')'; part2 = '(';
+      }
+    }
+
+    if (scanDirection) {
+      int unmatched = scanDirection;
+      int unmatchedOther = 0;
+      for (int i = pos + scanDirection; i >= 0 && i < len; i += scanDirection) {
+        /* TODO: the right thing when inside a string */
+        if (strchr("}])", buf32[i])) {
+          if (buf32[i] == part1) {
+            --unmatched;
+          } else {
+            --unmatchedOther;
+          }
+        } else if (strchr("{[(", buf32[i])) {
+          if (buf32[i] == part2) {
+            ++unmatched;
+          } else {
+            ++unmatchedOther;
+          }
+        }
+/*
+        if (strchr("}])", buf32[i]))
+          --unmatched;
+        else if (strchr("{[(", buf32[i]))
+          ++unmatched;
+*/
+        if (unmatched == 0) {
+          highlight = i;
+          indicateError = (unmatchedOther != 0);
+          break;
+        }
+      }
+    }
+  }
+
+  // calculate the position of the end of the input line
+  int xEndOfInput, yEndOfInput;
+  calculateScreenPosition(pi.promptIndentation, 0, pi.promptScreenColumns,
+                          calculateColumnPosition(buf32, len), xEndOfInput,
+                          yEndOfInput);
+
+  // calculate the desired position of the cursor
+  int xCursorPos, yCursorPos;
+  calculateScreenPosition(pi.promptIndentation, 0, pi.promptScreenColumns,
+                          calculateColumnPosition(buf32, pos), xCursorPos,
+                          yCursorPos);
+
+#ifdef _WIN32
+  // position at the end of the prompt, clear to end of previous input
+  CONSOLE_SCREEN_BUFFER_INFO inf;
+  GetConsoleScreenBufferInfo(console_out, &inf);
+  inf.dwCursorPosition.X = pi.promptIndentation;  // 0-based on Win32
+  inf.dwCursorPosition.Y -= pi.promptCursorRowOffset - pi.promptExtraLines;
+  SetConsoleCursorPosition(console_out, inf.dwCursorPosition);
+  DWORD count;
+  if (len < pi.promptPreviousInputLen)
+    FillConsoleOutputCharacterA(console_out, ' ', pi.promptPreviousInputLen,
+                                inf.dwCursorPosition, &count);
+  pi.promptPreviousInputLen = len;
+
+  // display the input line
+  if (highlight == -1) {
+    if (write32(1, buf32, len) == -1) return;
+  } else {
+    if (write32(1, buf32, highlight) == -1) return;
+    setDisplayAttribute(true, indicateError); /* bright blue (visible with both B&W bg) */
+    if (write32(1, &buf32[highlight], 1) == -1) return;
+    setDisplayAttribute(false, indicateError);
+    if (write32(1, buf32 + highlight + 1, len - highlight - 1) == -1) return;
+  }
+
+  // position the cursor
+  GetConsoleScreenBufferInfo(console_out, &inf);
+  inf.dwCursorPosition.X = xCursorPos;  // 0-based on Win32
+  inf.dwCursorPosition.Y -= yEndOfInput - yCursorPos;
+  SetConsoleCursorPosition(console_out, inf.dwCursorPosition);
+#else  // _WIN32
+  char seq[64];
+  int cursorRowMovement = pi.promptCursorRowOffset - pi.promptExtraLines;
+  if (cursorRowMovement > 0) {  // move the cursor up as required
+    snprintf(seq, sizeof seq, "\x1b[%dA", cursorRowMovement);
+    if (write(1, seq, strlen(seq)) == -1) return;
+  }
+  // position at the end of the prompt, clear to end of screen
+  snprintf(seq, sizeof seq, "\x1b[%dG\x1b[J",
+           pi.promptIndentation + 1);  // 1-based on VT100
+  if (write(1, seq, strlen(seq)) == -1) return;
+
+  if (highlight == -1) {  // write unhighlighted text
+    if (write32(1, buf32, len) == -1) return;
+  } else {  // highlight the matching brace/bracket/parenthesis
+    if (write32(1, buf32, highlight) == -1) return;
+    setDisplayAttribute(true, indicateError);
+    if (write32(1, &buf32[highlight], 1) == -1) return;
+    setDisplayAttribute(false, indicateError);
+    if (write32(1, buf32 + highlight + 1, len - highlight - 1) == -1) return;
+  }
+
+  // we have to generate our own newline on line wrap
+  if (xEndOfInput == 0 && yEndOfInput > 0)
+    if (write(1, "\n", 1) == -1) return;
+
+  // position the cursor
+  cursorRowMovement = yEndOfInput - yCursorPos;
+  if (cursorRowMovement > 0) {  // move the cursor up as required
+    snprintf(seq, sizeof seq, "\x1b[%dA", cursorRowMovement);
+    if (write(1, seq, strlen(seq)) == -1) return;
+  }
+  // position the cursor within the line
+  snprintf(seq, sizeof seq, "\x1b[%dG", xCursorPos + 1);  // 1-based on VT100
+  if (write(1, seq, strlen(seq)) == -1) return;
+#endif
+
+  pi.promptCursorRowOffset =
+      pi.promptExtraLines + yCursorPos;  // remember row for next pass
+}
+
+#ifndef _WIN32
+
+/**
+ * Read a UTF-8 sequence from the non-Windows keyboard and return the Unicode
+ * (char32_t) character it
+ * encodes
+ *
+ * @return  char32_t Unicode character
+ */
+static char32_t readUnicodeCharacter(void) {
+  static char8_t utf8String[5];
+  static size_t utf8Count = 0;
+  while (true) {
+    char8_t c;
+
+    /* Continue reading if interrupted by signal. */
+    ssize_t nread;
+    do {
+      nread = read(0, &c, 1);
+    } while ((nread == -1) && (errno == EINTR));
+
+    if (nread <= 0) return 0;
+    if (c <= 0x7F) {  // short circuit ASCII
+      utf8Count = 0;
+      return c;
+    } else if (utf8Count < sizeof(utf8String) - 1) {
+      utf8String[utf8Count++] = c;
+      utf8String[utf8Count] = 0;
+      char32_t unicodeChar[2];
+      size_t ucharCount;
+      ConversionResult res =
+          copyString8to32(unicodeChar, 2, ucharCount, utf8String);
+      if (res == conversionOK && ucharCount) {
+        utf8Count = 0;
+        return unicodeChar[0];
+      }
+    } else {
+      utf8Count =
+          0;  // this shouldn't happen: got four bytes but no UTF-8 character
+    }
+  }
+}
+
+namespace EscapeSequenceProcessing {  // move these out of global namespace
+
+// This chunk of code does parsing of the escape sequences sent by various Linux
+// terminals.
+//
+// It handles arrow keys, Home, End and Delete keys by interpreting the
+// sequences sent by
+// gnome terminal, xterm, rxvt, konsole, aterm and yakuake including the Alt and
+// Ctrl key
+// combinations that are understood by linenoise.
+//
+// The parsing uses tables, a bunch of intermediate dispatch routines and a
+// doDispatch
+// loop that reads the tables and sends control to "deeper" routines to continue
+// the
+// parsing.  The starting call to doDispatch( c, initialDispatch ) will
+// eventually return
+// either a character (with optional CTRL and META bits set), or -1 if parsing
+// fails, or
+// zero if an attempt to read from the keyboard fails.
+//
+// This is rather sloppy escape sequence processing, since we're not paying
+// attention to what the
+// actual TERM is set to and are processing all key sequences for all terminals,
+// but it works with
+// the most common keystrokes on the most common terminals.  It's intricate, but
+// the nested 'if'
+// statements required to do it directly would be worse.  This way has the
+// advantage of allowing
+// changes and extensions without having to touch a lot of code.
+
+// This is a typedef for the routine called by doDispatch().  It takes the
+// current character
+// as input, does any required processing including reading more characters and
+// calling other
+// dispatch routines, then eventually returns the final (possibly extended or
+// special) character.
+//
+typedef char32_t (*CharacterDispatchRoutine)(char32_t);
+
+// This structure is used by doDispatch() to hold a list of characters to test
+// for and
+// a list of routines to call if the character matches.  The dispatch routine
+// list is one
+// longer than the character list; the final entry is used if no character
+// matches.
+//
+struct CharacterDispatch {
+  unsigned int len;                    // length of the chars list
+  const char* chars;                   // chars to test
+  CharacterDispatchRoutine* dispatch;  // array of routines to call
+};
+
+// This dispatch routine is given a dispatch table and then farms work out to
+// routines
+// listed in the table based on the character it is called with.  The dispatch
+// routines can
+// read more input characters to decide what should eventually be returned.
+// Eventually,
+// a called routine returns either a character or -1 to indicate parsing
+// failure.
+//
+static char32_t doDispatch(char32_t c, CharacterDispatch& dispatchTable) {
+  for (unsigned int i = 0; i < dispatchTable.len; ++i) {
+    if (static_cast<unsigned char>(dispatchTable.chars[i]) == c) {
+      return dispatchTable.dispatch[i](c);
+    }
+  }
+  return dispatchTable.dispatch[dispatchTable.len](c);
+}
+
+static char32_t thisKeyMetaCtrl =
+    0;  // holds pre-set Meta and/or Ctrl modifiers
+
+// Final dispatch routines -- return something
+//
+static char32_t normalKeyRoutine(char32_t c) { return thisKeyMetaCtrl | c; }
+static char32_t upArrowKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | UP_ARROW_KEY;
+}
+static char32_t downArrowKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | DOWN_ARROW_KEY;
+}
+static char32_t rightArrowKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | RIGHT_ARROW_KEY;
+}
+static char32_t leftArrowKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | LEFT_ARROW_KEY;
+}
+static char32_t homeKeyRoutine(char32_t) { return thisKeyMetaCtrl | HOME_KEY; }
+static char32_t endKeyRoutine(char32_t) { return thisKeyMetaCtrl | END_KEY; }
+static char32_t pageUpKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | PAGE_UP_KEY;
+}
+static char32_t pageDownKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | PAGE_DOWN_KEY;
+}
+static char32_t deleteCharRoutine(char32_t) {
+  return thisKeyMetaCtrl | ctrlChar('H');
+}  // key labeled Backspace
+static char32_t deleteKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | DELETE_KEY;
+}  // key labeled Delete
+static char32_t ctrlUpArrowKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | CTRL | UP_ARROW_KEY;
+}
+static char32_t ctrlDownArrowKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | CTRL | DOWN_ARROW_KEY;
+}
+static char32_t ctrlRightArrowKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | CTRL | RIGHT_ARROW_KEY;
+}
+static char32_t ctrlLeftArrowKeyRoutine(char32_t) {
+  return thisKeyMetaCtrl | CTRL | LEFT_ARROW_KEY;
+}
+static char32_t escFailureRoutine(char32_t) {
+  beep();
+  return -1;
+}
+
+// Handle ESC [ 1 ; 3 (or 5) <more stuff> escape sequences
+//
+static CharacterDispatchRoutine escLeftBracket1Semicolon3or5Routines[] = {
+    upArrowKeyRoutine, downArrowKeyRoutine, rightArrowKeyRoutine,
+    leftArrowKeyRoutine, escFailureRoutine};
+static CharacterDispatch escLeftBracket1Semicolon3or5Dispatch = {
+    4, "ABCD", escLeftBracket1Semicolon3or5Routines};
+
+// Handle ESC [ 1 ; <more stuff> escape sequences
+//
+static char32_t escLeftBracket1Semicolon3Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  thisKeyMetaCtrl |= META;
+  return doDispatch(c, escLeftBracket1Semicolon3or5Dispatch);
+}
+static char32_t escLeftBracket1Semicolon5Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  thisKeyMetaCtrl |= CTRL;
+  return doDispatch(c, escLeftBracket1Semicolon3or5Dispatch);
+}
+static CharacterDispatchRoutine escLeftBracket1SemicolonRoutines[] = {
+    escLeftBracket1Semicolon3Routine, escLeftBracket1Semicolon5Routine,
+    escFailureRoutine};
+static CharacterDispatch escLeftBracket1SemicolonDispatch = {
+    2, "35", escLeftBracket1SemicolonRoutines};
+
+// Handle ESC [ 1 <more stuff> escape sequences
+//
+static char32_t escLeftBracket1SemicolonRoutine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracket1SemicolonDispatch);
+}
+static CharacterDispatchRoutine escLeftBracket1Routines[] = {
+    homeKeyRoutine, escLeftBracket1SemicolonRoutine, escFailureRoutine};
+static CharacterDispatch escLeftBracket1Dispatch = {2, "~;",
+                                                    escLeftBracket1Routines};
+
+// Handle ESC [ 3 <more stuff> escape sequences
+//
+static CharacterDispatchRoutine escLeftBracket3Routines[] = {deleteKeyRoutine,
+                                                             escFailureRoutine};
+static CharacterDispatch escLeftBracket3Dispatch = {1, "~",
+                                                    escLeftBracket3Routines};
+
+// Handle ESC [ 4 <more stuff> escape sequences
+//
+static CharacterDispatchRoutine escLeftBracket4Routines[] = {endKeyRoutine,
+                                                             escFailureRoutine};
+static CharacterDispatch escLeftBracket4Dispatch = {1, "~",
+                                                    escLeftBracket4Routines};
+
+// Handle ESC [ 5 <more stuff> escape sequences
+//
+static CharacterDispatchRoutine escLeftBracket5Routines[] = {pageUpKeyRoutine,
+                                                             escFailureRoutine};
+static CharacterDispatch escLeftBracket5Dispatch = {1, "~",
+                                                    escLeftBracket5Routines};
+
+// Handle ESC [ 6 <more stuff> escape sequences
+//
+static CharacterDispatchRoutine escLeftBracket6Routines[] = {pageDownKeyRoutine,
+                                                             escFailureRoutine};
+static CharacterDispatch escLeftBracket6Dispatch = {1, "~",
+                                                    escLeftBracket6Routines};
+
+// Handle ESC [ 7 <more stuff> escape sequences
+//
+static CharacterDispatchRoutine escLeftBracket7Routines[] = {homeKeyRoutine,
+                                                             escFailureRoutine};
+static CharacterDispatch escLeftBracket7Dispatch = {1, "~",
+                                                    escLeftBracket7Routines};
+
+// Handle ESC [ 8 <more stuff> escape sequences
+//
+static CharacterDispatchRoutine escLeftBracket8Routines[] = {endKeyRoutine,
+                                                             escFailureRoutine};
+static CharacterDispatch escLeftBracket8Dispatch = {1, "~",
+                                                    escLeftBracket8Routines};
+
+// Handle ESC [ <digit> escape sequences
+//
+static char32_t escLeftBracket0Routine(char32_t c) {
+  return escFailureRoutine(c);
+}
+static char32_t escLeftBracket1Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracket1Dispatch);
+}
+static char32_t escLeftBracket2Routine(char32_t c) {
+  return escFailureRoutine(c);  // Insert key, unused
+}
+static char32_t escLeftBracket3Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracket3Dispatch);
+}
+static char32_t escLeftBracket4Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracket4Dispatch);
+}
+static char32_t escLeftBracket5Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracket5Dispatch);
+}
+static char32_t escLeftBracket6Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracket6Dispatch);
+}
+static char32_t escLeftBracket7Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracket7Dispatch);
+}
+static char32_t escLeftBracket8Routine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracket8Dispatch);
+}
+static char32_t escLeftBracket9Routine(char32_t c) {
+  return escFailureRoutine(c);
+}
+
+// Handle ESC [ <more stuff> escape sequences
+//
+static CharacterDispatchRoutine escLeftBracketRoutines[] = {
+    upArrowKeyRoutine,      downArrowKeyRoutine,    rightArrowKeyRoutine,
+    leftArrowKeyRoutine,    homeKeyRoutine,         endKeyRoutine,
+    escLeftBracket0Routine, escLeftBracket1Routine, escLeftBracket2Routine,
+    escLeftBracket3Routine, escLeftBracket4Routine, escLeftBracket5Routine,
+    escLeftBracket6Routine, escLeftBracket7Routine, escLeftBracket8Routine,
+    escLeftBracket9Routine, escFailureRoutine};
+static CharacterDispatch escLeftBracketDispatch = {16, "ABCDHF0123456789",
+                                                   escLeftBracketRoutines};
+
+// Handle ESC O <char> escape sequences
+//
+static CharacterDispatchRoutine escORoutines[] = {
+    upArrowKeyRoutine,       downArrowKeyRoutine,     rightArrowKeyRoutine,
+    leftArrowKeyRoutine,     homeKeyRoutine,          endKeyRoutine,
+    ctrlUpArrowKeyRoutine,   ctrlDownArrowKeyRoutine, ctrlRightArrowKeyRoutine,
+    ctrlLeftArrowKeyRoutine, escFailureRoutine};
+static CharacterDispatch escODispatch = {10, "ABCDHFabcd", escORoutines};
+
+// Initial ESC dispatch -- could be a Meta prefix or the start of an escape
+// sequence
+//
+static char32_t escLeftBracketRoutine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escLeftBracketDispatch);
+}
+static char32_t escORoutine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escODispatch);
+}
+static char32_t setMetaRoutine(char32_t c);  // need forward reference
+static CharacterDispatchRoutine escRoutines[] = {escLeftBracketRoutine,
+                                                 escORoutine, setMetaRoutine};
+static CharacterDispatch escDispatch = {2, "[O", escRoutines};
+
+// Initial dispatch -- we are not in the middle of anything yet
+//
+static char32_t escRoutine(char32_t c) {
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+  return doDispatch(c, escDispatch);
+}
+static CharacterDispatchRoutine initialRoutines[] = {
+    escRoutine, deleteCharRoutine, normalKeyRoutine};
+static CharacterDispatch initialDispatch = {2, "\x1B\x7F", initialRoutines};
+
+// Special handling for the ESC key because it does double duty
+//
+static char32_t setMetaRoutine(char32_t c) {
+  thisKeyMetaCtrl = META;
+  if (c == 0x1B) {  // another ESC, stay in ESC processing mode
+    c = readUnicodeCharacter();
+    if (c == 0) return 0;
+    return doDispatch(c, escDispatch);
+  }
+  return doDispatch(c, initialDispatch);
+}
+
+}  // namespace EscapeSequenceProcessing // move these out of global namespace
+
+#endif  // #ifndef _WIN32
+
+// linenoiseReadChar -- read a keystroke or keychord from the keyboard, and
+// translate it
+// into an encoded "keystroke".  When convenient, extended keys are translated
+// into their
+// simpler Emacs keystrokes, so an unmodified "left arrow" becomes Ctrl-B.
+//
+// A return value of zero means "no input available", and a return value of -1
+// means "invalid key".
+//
+static char32_t linenoiseReadChar(void) {
+#ifdef _WIN32
+
+  INPUT_RECORD rec;
+  DWORD count;
+  int modifierKeys = 0;
+  bool escSeen = false;
+  while (true) {
+    ReadConsoleInputW(console_in, &rec, 1, &count);
+#if 0  // helper for debugging keystrokes, display info in the debug "Output"
+       // window in the debugger
+        {
+            if ( rec.EventType == KEY_EVENT ) {
+                //if ( rec.Event.KeyEvent.uChar.UnicodeChar ) {
+                    char buf[1024];
+                    sprintf(
+                            buf,
+                            "Unicode character 0x%04X, repeat count %d, virtual keycode 0x%04X, "
+                            "virtual scancode 0x%04X, key %s%s%s%s%s\n",
+                            rec.Event.KeyEvent.uChar.UnicodeChar,
+                            rec.Event.KeyEvent.wRepeatCount,
+                            rec.Event.KeyEvent.wVirtualKeyCode,
+                            rec.Event.KeyEvent.wVirtualScanCode,
+                            rec.Event.KeyEvent.bKeyDown ? "down" : "up",
+                                (rec.Event.KeyEvent.dwControlKeyState & LEFT_CTRL_PRESSED)  ?
+                                    " L-Ctrl" : "",
+                                (rec.Event.KeyEvent.dwControlKeyState & RIGHT_CTRL_PRESSED) ?
+                                    " R-Ctrl" : "",
+                                (rec.Event.KeyEvent.dwControlKeyState & LEFT_ALT_PRESSED)   ?
+                                    " L-Alt"  : "",
+                                (rec.Event.KeyEvent.dwControlKeyState & RIGHT_ALT_PRESSED)  ?
+                                    " R-Alt"  : ""
+                           );
+                    OutputDebugStringA( buf );
+                //}
+            }
+        }
+#endif
+    if (rec.EventType != KEY_EVENT) {
+      continue;
+    }
+    // Windows provides for entry of characters that are not on your keyboard by
+    // sending the
+    // Unicode characters as a "key up" with virtual keycode 0x12 (VK_MENU ==
+    // Alt key) ...
+    // accept these characters, otherwise only process characters on "key down"
+    if (!rec.Event.KeyEvent.bKeyDown &&
+        rec.Event.KeyEvent.wVirtualKeyCode != VK_MENU) {
+      continue;
+    }
+    modifierKeys = 0;
+    // AltGr is encoded as ( LEFT_CTRL_PRESSED | RIGHT_ALT_PRESSED ), so don't
+    // treat this
+    // combination as either CTRL or META we just turn off those two bits, so it
+    // is still
+    // possible to combine CTRL and/or META with an AltGr key by using
+    // right-Ctrl and/or
+    // left-Alt
+    if ((rec.Event.KeyEvent.dwControlKeyState &
+         (LEFT_CTRL_PRESSED | RIGHT_ALT_PRESSED)) ==
+        (LEFT_CTRL_PRESSED | RIGHT_ALT_PRESSED)) {
+      rec.Event.KeyEvent.dwControlKeyState &=
+          ~(LEFT_CTRL_PRESSED | RIGHT_ALT_PRESSED);
+    }
+    if (rec.Event.KeyEvent.dwControlKeyState &
+        (RIGHT_CTRL_PRESSED | LEFT_CTRL_PRESSED)) {
+      modifierKeys |= CTRL;
+    }
+    if (rec.Event.KeyEvent.dwControlKeyState &
+        (RIGHT_ALT_PRESSED | LEFT_ALT_PRESSED)) {
+      modifierKeys |= META;
+    }
+    if (escSeen) {
+      modifierKeys |= META;
+    }
+    if (rec.Event.KeyEvent.uChar.UnicodeChar == 0) {
+      switch (rec.Event.KeyEvent.wVirtualKeyCode) {
+        case VK_LEFT:
+          return modifierKeys | LEFT_ARROW_KEY;
+        case VK_RIGHT:
+          return modifierKeys | RIGHT_ARROW_KEY;
+        case VK_UP:
+          return modifierKeys | UP_ARROW_KEY;
+        case VK_DOWN:
+          return modifierKeys | DOWN_ARROW_KEY;
+        case VK_DELETE:
+          return modifierKeys | DELETE_KEY;
+        case VK_HOME:
+          return modifierKeys | HOME_KEY;
+        case VK_END:
+          return modifierKeys | END_KEY;
+        case VK_PRIOR:
+          return modifierKeys | PAGE_UP_KEY;
+        case VK_NEXT:
+          return modifierKeys | PAGE_DOWN_KEY;
+        default:
+          continue;  // in raw mode, ReadConsoleInput shows shift, ctrl ...
+      }              //  ... ignore them
+    } else if (rec.Event.KeyEvent.uChar.UnicodeChar ==
+               ctrlChar('[')) {  // ESC, set flag for later
+      escSeen = true;
+      continue;
+    } else {
+      // we got a real character, return it
+      return modifierKeys | rec.Event.KeyEvent.uChar.UnicodeChar;
+    }
+  }
+
+#else
+  char32_t c;
+  c = readUnicodeCharacter();
+  if (c == 0) return 0;
+
+// If _DEBUG_LINUX_KEYBOARD is set, then ctrl-^ puts us into a keyboard
+// debugging mode
+// where we print out decimal and decoded values for whatever the "terminal"
+// program
+// gives us on different keystrokes.  Hit ctrl-C to exit this mode.
+//
+#define _DEBUG_LINUX_KEYBOARD
+#if defined(_DEBUG_LINUX_KEYBOARD)
+  if (c == ctrlChar('^')) {  // ctrl-^, special debug mode, prints all keys hit,
+                             // ctrl-C to get out
+    printf(
+        "\nEntering keyboard debugging mode (on ctrl-^), press ctrl-C to exit "
+        "this mode\n");
+    while (true) {
+      unsigned char keys[10];
+      int ret = read(0, keys, 10);
+
+      if (ret <= 0) {
+        printf("\nret: %d\n", ret);
+      }
+      for (int i = 0; i < ret; ++i) {
+        char32_t key = static_cast<char32_t>(keys[i]);
+        char* friendlyTextPtr;
+        char friendlyTextBuf[10];
+        const char* prefixText = (key < 0x80) ? "" : "0x80+";
+        char32_t keyCopy = (key < 0x80) ? key : key - 0x80;
+        if (keyCopy >= '!' && keyCopy <= '~') {  // printable
+          friendlyTextBuf[0] = '\'';
+          friendlyTextBuf[1] = keyCopy;
+          friendlyTextBuf[2] = '\'';
+          friendlyTextBuf[3] = 0;
+          friendlyTextPtr = friendlyTextBuf;
+        } else if (keyCopy == ' ') {
+          friendlyTextPtr = const_cast<char*>("space");
+        } else if (keyCopy == 27) {
+          friendlyTextPtr = const_cast<char*>("ESC");
+        } else if (keyCopy == 0) {
+          friendlyTextPtr = const_cast<char*>("NUL");
+        } else if (keyCopy == 127) {
+          friendlyTextPtr = const_cast<char*>("DEL");
+        } else {
+          friendlyTextBuf[0] = '^';
+          friendlyTextBuf[1] = keyCopy + 0x40;
+          friendlyTextBuf[2] = 0;
+          friendlyTextPtr = friendlyTextBuf;
+        }
+        printf("%d x%02X (%s%s)  ", key, key, prefixText, friendlyTextPtr);
+      }
+      printf("\x1b[1G\n");  // go to first column of new line
+
+      // drop out of this loop on ctrl-C
+      if (keys[0] == ctrlChar('C')) {
+        printf("Leaving keyboard debugging mode (on ctrl-C)\n");
+        fflush(stdout);
+        return -2;
+      }
+    }
+  }
+#endif  // _DEBUG_LINUX_KEYBOARD
+
+  EscapeSequenceProcessing::thisKeyMetaCtrl =
+      0;  // no modifiers yet at initialDispatch
+  return EscapeSequenceProcessing::doDispatch(
+      c, EscapeSequenceProcessing::initialDispatch);
+#endif  // #_WIN32
+}
+
+/**
+ * Free memory used in a recent command completion session
+ *
+ * @param lc pointer to a linenoiseCompletions struct
+ */
+static void freeCompletions(linenoiseCompletions* lc) {
+  lc->completionStrings.clear();
+}
+
+/**
+ * convert {CTRL + 'A'}, {CTRL + 'a'} and {CTRL + ctrlChar( 'A' )} into
+ * ctrlChar( 'A' )
+ * leave META alone
+ *
+ * @param c character to clean up
+ * @return cleaned-up character
+ */
+static int cleanupCtrl(int c) {
+  if (c & CTRL) {
+    int d = c & 0x1FF;
+    if (d >= 'a' && d <= 'z') {
+      c = (c + ('a' - ctrlChar('A'))) & ~CTRL;
+    }
+    if (d >= 'A' && d <= 'Z') {
+      c = (c + ('A' - ctrlChar('A'))) & ~CTRL;
+    }
+    if (d >= ctrlChar('A') && d <= ctrlChar('Z')) {
+      c = c & ~CTRL;
+    }
+  }
+  return c;
+}
+
+// break characters that may precede items to be completed
+static const char breakChars[] = " =+-/\\*?\"'`&<>;|@{([])}";
+
+// maximum number of completions to display without asking
+static const size_t completionCountCutoff = 100;
+
+/**
+ * Handle command completion, using a completionCallback() routine to provide
+ * possible substitutions
+ * This routine handles the mechanics of updating the user's input buffer with
+ * possible replacement
+ * of text as the user selects a proposed completion string, or cancels the
+ * completion attempt.
+ * @param pi     PromptBase struct holding information about the prompt and our
+ * screen position
+ */
+int InputBuffer::completeLine(PromptBase& pi) {
+  linenoiseCompletions lc;
+  char32_t c = 0;
+
+  // completionCallback() expects a parsable entity, so find the previous break
+  // character and
+  // extract a copy to parse.  we also handle the case where tab is hit while
+  // not at end-of-line.
+  int startIndex = pos;
+  while (--startIndex >= 0) {
+    if (strchr(breakChars, buf32[startIndex])) {
+      break;
+    }
+  }
+  ++startIndex;
+  int itemLength = pos - startIndex;
+  Utf32String unicodeCopy(&buf32[startIndex], itemLength);
+  Utf8String parseItem(unicodeCopy);
+
+  // get a list of completions
+  completionCallback(parseItem.get(), &lc);
+
+  // if no completions, we are done
+  if (lc.completionStrings.size() == 0) {
+    beep();
+    freeCompletions(&lc);
+    return 0;
+  }
+
+  // at least one completion
+  int longestCommonPrefix = 0;
+  int displayLength = 0;
+  if (lc.completionStrings.size() == 1) {
+    longestCommonPrefix = static_cast<int>(lc.completionStrings[0].length());
+  } else {
+    bool keepGoing = true;
+    while (keepGoing) {
+      for (size_t j = 0; j < lc.completionStrings.size() - 1; ++j) {
+        char32_t c1 = lc.completionStrings[j][longestCommonPrefix];
+        char32_t c2 = lc.completionStrings[j + 1][longestCommonPrefix];
+        if ((0 == c1) || (0 == c2) || (c1 != c2)) {
+          keepGoing = false;
+          break;
+        }
+      }
+      if (keepGoing) {
+        ++longestCommonPrefix;
+      }
+    }
+  }
+  if (lc.completionStrings.size() != 1) {  // beep if ambiguous
+    beep();
+  }
+
+  // if we can extend the item, extend it and return to main loop
+  if (longestCommonPrefix > itemLength) {
+    displayLength = len + longestCommonPrefix - itemLength;
+    if (displayLength > buflen) {
+      longestCommonPrefix -= displayLength - buflen;  // don't overflow buffer
+      displayLength = buflen;                         // truncate the insertion
+      beep();                                         // and make a noise
+    }
+    Utf32String displayText(displayLength + 1);
+    memcpy(displayText.get(), buf32, sizeof(char32_t) * startIndex);
+    memcpy(&displayText[startIndex], &lc.completionStrings[0][0],
+           sizeof(char32_t) * longestCommonPrefix);
+    int tailIndex = startIndex + longestCommonPrefix;
+    memcpy(&displayText[tailIndex], &buf32[pos],
+           sizeof(char32_t) * (displayLength - tailIndex + 1));
+    copyString32(buf32, displayText.get(), displayLength);
+    pos = startIndex + longestCommonPrefix;
+    len = displayLength;
+    refreshLine(pi);
+    return 0;
+  }
+
+  // we can't complete any further, wait for second tab
+  do {
+    c = linenoiseReadChar();
+    c = cleanupCtrl(c);
+  } while (c == static_cast<char32_t>(-1));
+
+  // if any character other than tab, pass it to the main loop
+  if (c != ctrlChar('I')) {
+    freeCompletions(&lc);
+    return c;
+  }
+
+  // we got a second tab, maybe show list of possible completions
+  bool showCompletions = true;
+  bool onNewLine = false;
+  if (lc.completionStrings.size() > completionCountCutoff) {
+    int savePos =
+        pos;  // move cursor to EOL to avoid overwriting the command line
+    pos = len;
+    refreshLine(pi);
+    pos = savePos;
+    printf("\nDisplay all %u possibilities? (y or n)",
+           static_cast<unsigned int>(lc.completionStrings.size()));
+    fflush(stdout);
+    onNewLine = true;
+    while (c != 'y' && c != 'Y' && c != 'n' && c != 'N' && c != ctrlChar('C')) {
+      do {
+        c = linenoiseReadChar();
+        c = cleanupCtrl(c);
+      } while (c == static_cast<char32_t>(-1));
+    }
+    switch (c) {
+      case 'n':
+      case 'N':
+        showCompletions = false;
+        freeCompletions(&lc);
+        break;
+      case ctrlChar('C'):
+        showCompletions = false;
+        freeCompletions(&lc);
+        if (write(1, "^C", 2) == -1) return -1;  // Display the ^C we got
+        c = 0;
+        break;
+    }
+  }
+
+  // if showing the list, do it the way readline does it
+  bool stopList = false;
+  if (showCompletions) {
+    int longestCompletion = 0;
+    for (size_t j = 0; j < lc.completionStrings.size(); ++j) {
+      itemLength = static_cast<int>(lc.completionStrings[j].length());
+      if (itemLength > longestCompletion) {
+        longestCompletion = itemLength;
+      }
+    }
+    longestCompletion += 2;
+    int columnCount = pi.promptScreenColumns / longestCompletion;
+    if (columnCount < 1) {
+      columnCount = 1;
+    }
+    if (!onNewLine) {  // skip this if we showed "Display all %d possibilities?"
+      int savePos =
+          pos;  // move cursor to EOL to avoid overwriting the command line
+      pos = len;
+      refreshLine(pi);
+      pos = savePos;
+    }
+    size_t pauseRow = getScreenRows() - 1;
+    size_t rowCount =
+        (lc.completionStrings.size() + columnCount - 1) / columnCount;
+    for (size_t row = 0; row < rowCount; ++row) {
+      if (row == pauseRow) {
+        printf("\n--More--");
+        fflush(stdout);
+        c = 0;
+        bool doBeep = false;
+        while (c != ' ' && c != '\r' && c != '\n' && c != 'y' && c != 'Y' &&
+               c != 'n' && c != 'N' && c != 'q' && c != 'Q' &&
+               c != ctrlChar('C')) {
+          if (doBeep) {
+            beep();
+          }
+          doBeep = true;
+          do {
+            c = linenoiseReadChar();
+            c = cleanupCtrl(c);
+          } while (c == static_cast<char32_t>(-1));
+        }
+        switch (c) {
+          case ' ':
+          case 'y':
+          case 'Y':
+            printf("\r        \r");
+            pauseRow += getScreenRows() - 1;
+            break;
+          case '\r':
+          case '\n':
+            printf("\r        \r");
+            ++pauseRow;
+            break;
+          case 'n':
+          case 'N':
+          case 'q':
+          case 'Q':
+            printf("\r        \r");
+            stopList = true;
+            break;
+          case ctrlChar('C'):
+            if (write(1, "^C", 2) == -1) return -1;  // Display the ^C we got
+            stopList = true;
+            break;
+        }
+      } else {
+        printf("\n");
+      }
+      if (stopList) {
+        break;
+      }
+      for (int column = 0; column < columnCount; ++column) {
+        size_t index = (column * rowCount) + row;
+        if (index < lc.completionStrings.size()) {
+          itemLength = static_cast<int>(lc.completionStrings[index].length());
+          fflush(stdout);
+          if (write32(1, lc.completionStrings[index].get(), itemLength) == -1)
+            return -1;
+          if (((column + 1) * rowCount) + row < lc.completionStrings.size()) {
+            for (int k = itemLength; k < longestCompletion; ++k) {
+              printf(" ");
+            }
+          }
+        }
+      }
+    }
+    fflush(stdout);
+    freeCompletions(&lc);
+  }
+
+  // display the prompt on a new line, then redisplay the input buffer
+  if (!stopList || c == ctrlChar('C')) {
+    if (write(1, "\n", 1) == -1) return 0;
+  }
+  if (!pi.write()) return 0;
+#ifndef _WIN32
+  // we have to generate our own newline on line wrap on Linux
+  if (pi.promptIndentation == 0 && pi.promptExtraLines > 0)
+    if (write(1, "\n", 1) == -1) return 0;
+#endif
+  pi.promptCursorRowOffset = pi.promptExtraLines;
+  refreshLine(pi);
+  return 0;
+}
+
+/**
+ * Clear the screen ONLY (no redisplay of anything)
+ */
+void linenoiseClearScreen(void) {
+#ifdef _WIN32
+  COORD coord = {0, 0};
+  CONSOLE_SCREEN_BUFFER_INFO inf;
+  HANDLE screenHandle = GetStdHandle(STD_OUTPUT_HANDLE);
+  GetConsoleScreenBufferInfo(screenHandle, &inf);
+  SetConsoleCursorPosition(screenHandle, coord);
+  DWORD count;
+  FillConsoleOutputCharacterA(screenHandle, ' ', inf.dwSize.X * inf.dwSize.Y,
+                              coord, &count);
+#else
+  if (write(1, "\x1b[H\x1b[2J", 7) <= 0) return;
+#endif
+}
+
+void InputBuffer::clearScreen(PromptBase& pi) {
+  linenoiseClearScreen();
+  if (!pi.write()) return;
+#ifndef _WIN32
+  // we have to generate our own newline on line wrap on Linux
+  if (pi.promptIndentation == 0 && pi.promptExtraLines > 0)
+    if (write(1, "\n", 1) == -1) return;
+#endif
+  pi.promptCursorRowOffset = pi.promptExtraLines;
+  refreshLine(pi);
+}
+
+/**
+ * Incremental history search -- take over the prompt and keyboard as the user
+ * types a search
+ * string, deletes characters from it, changes direction, and either accepts the
+ * found line (for
+ * execution orediting) or cancels.
+ * @param pi        PromptBase struct holding information about the (old,
+ * static) prompt and our
+ *                  screen position
+ * @param startChar the character that began the search, used to set the initial
+ * direction
+ */
+int InputBuffer::incrementalHistorySearch(PromptBase& pi, int startChar) {
+  size_t bufferSize;
+  size_t ucharCount = 0;
+
+  // if not already recalling, add the current line to the history list so we
+  // don't have to
+  // special case it
+  if (historyIndex == historyLen - 1) {
+    free(history[historyLen - 1]);
+    bufferSize = sizeof(char32_t) * len + 1;
+    unique_ptr<char[]> tempBuffer(new char[bufferSize]);
+    copyString32to8(tempBuffer.get(), bufferSize, buf32);
+    history[historyLen - 1] = strdup8(tempBuffer.get());
+  }
+  int historyLineLength = len;
+  int historyLinePosition = pos;
+  char32_t emptyBuffer[1];
+  char emptyWidths[1];
+  InputBuffer empty(emptyBuffer, emptyWidths, 1);
+  empty.refreshLine(pi);  // erase the old input first
+  DynamicPrompt dp(pi, (startChar == ctrlChar('R')) ? -1 : 1);
+
+  dp.promptPreviousLen = pi.promptPreviousLen;
+  dp.promptPreviousInputLen = pi.promptPreviousInputLen;
+  dynamicRefresh(dp, buf32, historyLineLength,
+                 historyLinePosition);  // draw user's text with our prompt
+
+  // loop until we get an exit character
+  int c = 0;
+  bool keepLooping = true;
+  bool useSearchedLine = true;
+  bool searchAgain = false;
+  char32_t* activeHistoryLine = 0;
+  while (keepLooping) {
+    c = linenoiseReadChar();
+    c = cleanupCtrl(c);  // convert CTRL + <char> into normal ctrl
+
+    switch (c) {
+      // these characters keep the selected text but do not execute it
+      case ctrlChar('A'):  // ctrl-A, move cursor to start of line
+      case HOME_KEY:
+      case ctrlChar('B'):  // ctrl-B, move cursor left by one character
+      case LEFT_ARROW_KEY:
+      case META + 'b':  // meta-B, move cursor left by one word
+      case META + 'B':
+      case CTRL + LEFT_ARROW_KEY:
+      case META + LEFT_ARROW_KEY:  // Emacs allows Meta, bash & readline don't
+      case ctrlChar('D'):
+      case META + 'd':  // meta-D, kill word to right of cursor
+      case META + 'D':
+      case ctrlChar('E'):  // ctrl-E, move cursor to end of line
+      case END_KEY:
+      case ctrlChar('F'):  // ctrl-F, move cursor right by one character
+      case RIGHT_ARROW_KEY:
+      case META + 'f':  // meta-F, move cursor right by one word
+      case META + 'F':
+      case CTRL + RIGHT_ARROW_KEY:
+      case META + RIGHT_ARROW_KEY:  // Emacs allows Meta, bash & readline don't
+      case META + ctrlChar('H'):
+      case ctrlChar('J'):
+      case ctrlChar('K'):  // ctrl-K, kill from cursor to end of line
+      case ctrlChar('M'):
+      case ctrlChar('N'):  // ctrl-N, recall next line in history
+      case ctrlChar('P'):  // ctrl-P, recall previous line in history
+      case DOWN_ARROW_KEY:
+      case UP_ARROW_KEY:
+      case ctrlChar('T'):  // ctrl-T, transpose characters
+      case ctrlChar(
+          'U'):  // ctrl-U, kill all characters to the left of the cursor
+      case ctrlChar('W'):
+      case META + 'y':  // meta-Y, "yank-pop", rotate popped text
+      case META + 'Y':
+      case 127:
+      case DELETE_KEY:
+      case META + '<':  // start of history
+      case PAGE_UP_KEY:
+      case META + '>':  // end of history
+      case PAGE_DOWN_KEY:
+        keepLooping = false;
+        break;
+
+      // these characters revert the input line to its previous state
+      case ctrlChar('C'):  // ctrl-C, abort this line
+      case ctrlChar('G'):
+      case ctrlChar('L'):  // ctrl-L, clear screen and redisplay line
+        keepLooping = false;
+        useSearchedLine = false;
+        if (c != ctrlChar('L')) {
+          c = -1;  // ctrl-C and ctrl-G just abort the search and do nothing
+                   // else
+        }
+        break;
+
+      // these characters stay in search mode and update the display
+      case ctrlChar('S'):
+      case ctrlChar('R'):
+        if (dp.searchTextLen ==
+            0) {  // if no current search text, recall previous text
+          if (previousSearchText.length()) {
+            dp.updateSearchText(previousSearchText.get());
+          }
+        }
+        if ((dp.direction == 1 && c == ctrlChar('R')) ||
+            (dp.direction == -1 && c == ctrlChar('S'))) {
+          dp.direction = 0 - dp.direction;  // reverse direction
+          dp.updateSearchPrompt();          // change the prompt
+        } else {
+          searchAgain = true;  // same direction, search again
+        }
+        break;
+
+// job control is its own thing
+#ifndef _WIN32
+      case ctrlChar('Z'):  // ctrl-Z, job control
+        disableRawMode();  // Returning to Linux (whatever) shell, leave raw
+                           // mode
+        raise(SIGSTOP);    // Break out in mid-line
+        enableRawMode();   // Back from Linux shell, re-enter raw mode
+        {
+          bufferSize = historyLineLength + 1;
+          unique_ptr<char32_t[]> tempUnicode(new char32_t[bufferSize]);
+          copyString8to32(tempUnicode.get(), bufferSize, ucharCount,
+                          history[historyIndex]);
+          dynamicRefresh(dp, tempUnicode.get(), historyLineLength,
+                         historyLinePosition);
+        }
+        continue;
+        break;
+#endif
+
+      // these characters update the search string, and hence the selected input
+      // line
+      case ctrlChar('H'):  // backspace/ctrl-H, delete char to left of cursor
+        if (dp.searchTextLen > 0) {
+          unique_ptr<char32_t[]> tempUnicode(new char32_t[dp.searchTextLen]);
+          --dp.searchTextLen;
+          dp.searchText[dp.searchTextLen] = 0;
+          copyString32(tempUnicode.get(), dp.searchText.get(),
+                       dp.searchTextLen);
+          dp.updateSearchText(tempUnicode.get());
+        } else {
+          beep();
+        }
+        break;
+
+      case ctrlChar('Y'):  // ctrl-Y, yank killed text
+        break;
+
+      default:
+        if (!isControlChar(c) && c <= 0x0010FFFF) {  // not an action character
+          unique_ptr<char32_t[]> tempUnicode(
+              new char32_t[dp.searchTextLen + 2]);
+          copyString32(tempUnicode.get(), dp.searchText.get(),
+                       dp.searchTextLen);
+          tempUnicode[dp.searchTextLen] = c;
+          tempUnicode[dp.searchTextLen + 1] = 0;
+          dp.updateSearchText(tempUnicode.get());
+        } else {
+          beep();
+        }
+    }  // switch
+
+    // if we are staying in search mode, search now
+    if (keepLooping) {
+      bufferSize = historyLineLength + 1;
+      if (activeHistoryLine) {
+        delete[] activeHistoryLine;
+        activeHistoryLine = nullptr;
+      }
+      activeHistoryLine = new char32_t[bufferSize];
+      copyString8to32(activeHistoryLine, bufferSize, ucharCount,
+                      history[historyIndex]);
+      if (dp.searchTextLen > 0) {
+        bool found = false;
+        int historySearchIndex = historyIndex;
+        int lineLength = static_cast<int>(ucharCount);
+        int lineSearchPos = historyLinePosition;
+        if (searchAgain) {
+          lineSearchPos += dp.direction;
+        }
+        searchAgain = false;
+        while (true) {
+          while ((dp.direction > 0) ? (lineSearchPos < lineLength)
+                                    : (lineSearchPos >= 0)) {
+            if (strncmp32(dp.searchText.get(),
+                          &activeHistoryLine[lineSearchPos],
+                          dp.searchTextLen) == 0) {
+              found = true;
+              break;
+            }
+            lineSearchPos += dp.direction;
+          }
+          if (found) {
+            historyIndex = historySearchIndex;
+            historyLineLength = lineLength;
+            historyLinePosition = lineSearchPos;
+            break;
+          } else if ((dp.direction > 0) ? (historySearchIndex < historyLen - 1)
+                                        : (historySearchIndex > 0)) {
+            historySearchIndex += dp.direction;
+            bufferSize = strlen8(history[historySearchIndex]) + 1;
+            delete[] activeHistoryLine;
+            activeHistoryLine = nullptr;
+            activeHistoryLine = new char32_t[bufferSize];
+            copyString8to32(activeHistoryLine, bufferSize, ucharCount,
+                            history[historySearchIndex]);
+            lineLength = static_cast<int>(ucharCount);
+            lineSearchPos =
+                (dp.direction > 0) ? 0 : (lineLength - dp.searchTextLen);
+          } else {
+            beep();
+            break;
+          }
+        };  // while
+      }
+      if (activeHistoryLine) {
+        delete[] activeHistoryLine;
+        activeHistoryLine = nullptr;
+      }
+      bufferSize = historyLineLength + 1;
+      activeHistoryLine = new char32_t[bufferSize];
+      copyString8to32(activeHistoryLine, bufferSize, ucharCount,
+                      history[historyIndex]);
+      dynamicRefresh(dp, activeHistoryLine, historyLineLength,
+                     historyLinePosition);  // draw user's text with our prompt
+    }
+  }  // while
+
+  // leaving history search, restore previous prompt, maybe make searched line
+  // current
+  PromptBase pb;
+  pb.promptChars = pi.promptIndentation;
+  pb.promptBytes = pi.promptBytes;
+  Utf32String tempUnicode(pb.promptBytes + 1);
+
+  copyString32(tempUnicode.get(), &pi.promptText[pi.promptLastLinePosition],
+               pb.promptBytes - pi.promptLastLinePosition);
+  tempUnicode.initFromBuffer();
+  pb.promptText = tempUnicode;
+  pb.promptExtraLines = 0;
+  pb.promptIndentation = pi.promptIndentation;
+  pb.promptLastLinePosition = 0;
+  pb.promptPreviousInputLen = historyLineLength;
+  pb.promptCursorRowOffset = dp.promptCursorRowOffset;
+  pb.promptScreenColumns = pi.promptScreenColumns;
+  pb.promptPreviousLen = dp.promptChars;
+  if (useSearchedLine && activeHistoryLine) {
+    historyRecallMostRecent = true;
+    copyString32(buf32, activeHistoryLine, buflen + 1);
+    len = historyLineLength;
+    pos = historyLinePosition;
+  }
+  if (activeHistoryLine) {
+    delete[] activeHistoryLine;
+    activeHistoryLine = nullptr;
+  }
+  dynamicRefresh(pb, buf32, len,
+                 pos);  // redraw the original prompt with current input
+  pi.promptPreviousInputLen = len;
+  pi.promptCursorRowOffset = pi.promptExtraLines + pb.promptCursorRowOffset;
+  previousSearchText =
+      dp.searchText;  // save search text for possible reuse on ctrl-R ctrl-R
+  return c;           // pass a character or -1 back to main loop
+}
+
+static bool isCharacterAlphanumeric(char32_t testChar) {
+#ifdef _WIN32
+  return (iswalnum((wint_t)testChar) != 0 ? true : false);
+#else
+  return (iswalnum(testChar) != 0 ? true : false);
+#endif
+}
+
+#ifndef _WIN32
+static bool gotResize = false;
+#endif
+static int keyType = 0;
+
+int InputBuffer::getInputLine(PromptBase& pi) {
+  keyType = 0;
+
+  // The latest history entry is always our current buffer
+  if (len > 0) {
+    size_t bufferSize = sizeof(char32_t) * len + 1;
+    unique_ptr<char[]> tempBuffer(new char[bufferSize]);
+    copyString32to8(tempBuffer.get(), bufferSize, buf32);
+    linenoiseHistoryAdd(tempBuffer.get());
+  } else {
+    linenoiseHistoryAdd("");
+  }
+  historyIndex = historyLen - 1;
+  historyRecallMostRecent = false;
+
+  // display the prompt
+  if (!pi.write()) return -1;
+
+#ifndef _WIN32
+  // we have to generate our own newline on line wrap on Linux
+  if (pi.promptIndentation == 0 && pi.promptExtraLines > 0)
+    if (write(1, "\n", 1) == -1) return -1;
+#endif
+
+  // the cursor starts out at the end of the prompt
+  pi.promptCursorRowOffset = pi.promptExtraLines;
+
+  // kill and yank start in "other" mode
+  killRing.lastAction = KillRing::actionOther;
+
+  // when history search returns control to us, we execute its terminating
+  // keystroke
+  int terminatingKeystroke = -1;
+
+  // if there is already text in the buffer, display it first
+  if (len > 0) {
+    refreshLine(pi);
+  }
+
+  // loop collecting characters, respond to line editing characters
+  while (true) {
+    int c;
+    if (terminatingKeystroke == -1) {
+      c = linenoiseReadChar();  // get a new keystroke
+
+      keyType = 0; 
+      if (c != 0) {
+        // set flag that we got some input
+        if (c == ctrlChar('C')) {
+          keyType = 1;
+        } else if (c == ctrlChar('D')) {
+          keyType = 2;
+        }
+      }
+
+#ifndef _WIN32
+      if (c == 0 && gotResize) {
+        // caught a window resize event
+        // now redraw the prompt and line
+        gotResize = false;
+        pi.promptScreenColumns = getScreenColumns();
+        dynamicRefresh(pi, buf32, len,
+                       pos);  // redraw the original prompt with current input
+        continue;
+      }
+#endif
+    } else {
+      c = terminatingKeystroke;   // use the terminating keystroke from search
+      terminatingKeystroke = -1;  // clear it once we've used it
+    }
+
+    c = cleanupCtrl(c);  // convert CTRL + <char> into normal ctrl
+
+    if (c == 0) {
+      return len;
+    }
+
+    if (c == -1) {
+      refreshLine(pi);
+      continue;
+    }
+
+    if (c == -2) {
+      if (!pi.write()) return -1;
+      refreshLine(pi);
+      continue;
+    }
+
+    // ctrl-I/tab, command completion, needs to be before switch statement
+    if (c == ctrlChar('I') && completionCallback) {
+      if (pos == 0)  // SERVER-4967 -- in earlier versions, you could paste
+                     // previous output
+        continue;    //  back into the shell ... this output may have leading
+                     //  tabs.
+      // This hack (i.e. what the old code did) prevents command completion
+      //  on an empty line but lets users paste text with leading tabs.
+
+      killRing.lastAction = KillRing::actionOther;
+      historyRecallMostRecent = false;
+
+      // completeLine does the actual completion and replacement
+      c = completeLine(pi);
+
+      if (c < 0)  // return on error
+        return len;
+
+      if (c == 0)  // read next character when 0
+        continue;
+
+      // deliberate fall-through here, so we use the terminating character
+    }
+
+    switch (c) {
+      case ctrlChar('A'):  // ctrl-A, move cursor to start of line
+      case HOME_KEY:
+        killRing.lastAction = KillRing::actionOther;
+        pos = 0;
+        refreshLine(pi);
+        break;
+
+      case ctrlChar('B'):  // ctrl-B, move cursor left by one character
+      case LEFT_ARROW_KEY:
+        killRing.lastAction = KillRing::actionOther;
+        if (pos > 0) {
+          --pos;
+          refreshLine(pi);
+        }
+        break;
+
+      case META + 'b':  // meta-B, move cursor left by one word
+      case META + 'B':
+      case CTRL + LEFT_ARROW_KEY:
+      case META + LEFT_ARROW_KEY:  // Emacs allows Meta, bash & readline don't
+        killRing.lastAction = KillRing::actionOther;
+        if (pos > 0) {
+          while (pos > 0 && !isCharacterAlphanumeric(buf32[pos - 1])) {
+            --pos;
+          }
+          while (pos > 0 && isCharacterAlphanumeric(buf32[pos - 1])) {
+            --pos;
+          }
+          refreshLine(pi);
+        }
+        break;
+
+      case ctrlChar('C'):  // ctrl-C, abort this line
+        killRing.lastAction = KillRing::actionOther;
+        historyRecallMostRecent = false;
+        errno = EAGAIN;
+        --historyLen;
+        free(history[historyLen]);
+        // we need one last refresh with the cursor at the end of the line
+        // so we don't display the next prompt over the previous input line
+        pos = len;  // pass len as pos for EOL
+        refreshLine(pi);
+        if (write(1, "^C", 2) == -1) return -1;  // Display the ^C we got
+        return -1;
+
+      case META + 'c':  // meta-C, give word initial Cap
+      case META + 'C':
+        killRing.lastAction = KillRing::actionOther;
+        historyRecallMostRecent = false;
+        if (pos < len) {
+          while (pos < len && !isCharacterAlphanumeric(buf32[pos])) {
+            ++pos;
+          }
+          if (pos < len && isCharacterAlphanumeric(buf32[pos])) {
+            if (buf32[pos] >= 'a' && buf32[pos] <= 'z') {
+              buf32[pos] += 'A' - 'a';
+            }
+            ++pos;
+          }
+          while (pos < len && isCharacterAlphanumeric(buf32[pos])) {
+            if (buf32[pos] >= 'A' && buf32[pos] <= 'Z') {
+              buf32[pos] += 'a' - 'A';
+            }
+            ++pos;
+          }
+          refreshLine(pi);
+        }
+        break;
+
+      // ctrl-D, delete the character under the cursor
+      // on an empty line, exit the shell
+      case ctrlChar('D'):
+        killRing.lastAction = KillRing::actionOther;
+        if (len > 0 && pos < len) {
+          historyRecallMostRecent = false;
+          memmove(buf32 + pos, buf32 + pos + 1, sizeof(char32_t) * (len - pos));
+          --len;
+          refreshLine(pi);
+        } else if (len == 0) {
+          --historyLen;
+          free(history[historyLen]);
+          return -1;
+        }
+        break;
+
+      case META + 'd':  // meta-D, kill word to right of cursor
+      case META + 'D':
+        if (pos < len) {
+          historyRecallMostRecent = false;
+          int endingPos = pos;
+          while (endingPos < len &&
+                 !isCharacterAlphanumeric(buf32[endingPos])) {
+            ++endingPos;
+          }
+          while (endingPos < len && isCharacterAlphanumeric(buf32[endingPos])) {
+            ++endingPos;
+          }
+          killRing.kill(&buf32[pos], endingPos - pos, true);
+          memmove(buf32 + pos, buf32 + endingPos,
+                  sizeof(char32_t) * (len - endingPos + 1));
+          len -= endingPos - pos;
+          refreshLine(pi);
+        }
+        killRing.lastAction = KillRing::actionKill;
+        break;
+
+      case ctrlChar('E'):  // ctrl-E, move cursor to end of line
+      case END_KEY:
+        killRing.lastAction = KillRing::actionOther;
+        pos = len;
+        refreshLine(pi);
+        break;
+
+      case ctrlChar('F'):  // ctrl-F, move cursor right by one character
+      case RIGHT_ARROW_KEY:
+        killRing.lastAction = KillRing::actionOther;
+        if (pos < len) {
+          ++pos;
+          refreshLine(pi);
+        }
+        break;
+
+      case META + 'f':  // meta-F, move cursor right by one word
+      case META + 'F':
+      case CTRL + RIGHT_ARROW_KEY:
+      case META + RIGHT_ARROW_KEY:  // Emacs allows Meta, bash & readline don't
+        killRing.lastAction = KillRing::actionOther;
+        if (pos < len) {
+          while (pos < len && !isCharacterAlphanumeric(buf32[pos])) {
+            ++pos;
+          }
+          while (pos < len && isCharacterAlphanumeric(buf32[pos])) {
+            ++pos;
+          }
+          refreshLine(pi);
+        }
+        break;
+
+      case ctrlChar('H'):  // backspace/ctrl-H, delete char to left of cursor
+        killRing.lastAction = KillRing::actionOther;
+        if (pos > 0) {
+          historyRecallMostRecent = false;
+          memmove(buf32 + pos - 1, buf32 + pos,
+                  sizeof(char32_t) * (1 + len - pos));
+          --pos;
+          --len;
+          refreshLine(pi);
+        }
+        break;
+
+      // meta-Backspace, kill word to left of cursor
+      case META + ctrlChar('H'):
+        if (pos > 0) {
+          historyRecallMostRecent = false;
+          int startingPos = pos;
+          while (pos > 0 && !isCharacterAlphanumeric(buf32[pos - 1])) {
+            --pos;
+          }
+          while (pos > 0 && isCharacterAlphanumeric(buf32[pos - 1])) {
+            --pos;
+          }
+          killRing.kill(&buf32[pos], startingPos - pos, false);
+          memmove(buf32 + pos, buf32 + startingPos,
+                  sizeof(char32_t) * (len - startingPos + 1));
+          len -= startingPos - pos;
+          refreshLine(pi);
+        }
+        killRing.lastAction = KillRing::actionKill;
+        break;
+
+      case ctrlChar('J'):  // ctrl-J/linefeed/newline, accept line
+      case ctrlChar('M'):  // ctrl-M/return/enter
+        killRing.lastAction = KillRing::actionOther;
+        // we need one last refresh with the cursor at the end of the line
+        // so we don't display the next prompt over the previous input line
+        pos = len;  // pass len as pos for EOL
+        refreshLine(pi);
+        historyPreviousIndex = historyRecallMostRecent ? historyIndex : -2;
+        --historyLen;
+        free(history[historyLen]);
+        return len;
+
+      case ctrlChar('K'):  // ctrl-K, kill from cursor to end of line
+        killRing.kill(&buf32[pos], len - pos, true);
+        buf32[pos] = '\0';
+        len = pos;
+        refreshLine(pi);
+        killRing.lastAction = KillRing::actionKill;
+        historyRecallMostRecent = false;
+        break;
+
+      case ctrlChar('L'):  // ctrl-L, clear screen and redisplay line
+        clearScreen(pi);
+        break;
+
+      case META + 'l':  // meta-L, lowercase word
+      case META + 'L':
+        killRing.lastAction = KillRing::actionOther;
+        if (pos < len) {
+          historyRecallMostRecent = false;
+          while (pos < len && !isCharacterAlphanumeric(buf32[pos])) {
+            ++pos;
+          }
+          while (pos < len && isCharacterAlphanumeric(buf32[pos])) {
+            if (buf32[pos] >= 'A' && buf32[pos] <= 'Z') {
+              buf32[pos] += 'a' - 'A';
+            }
+            ++pos;
+          }
+          refreshLine(pi);
+        }
+        break;
+
+      case ctrlChar('N'):  // ctrl-N, recall next line in history
+      case ctrlChar('P'):  // ctrl-P, recall previous line in history
+      case DOWN_ARROW_KEY:
+      case UP_ARROW_KEY:
+        killRing.lastAction = KillRing::actionOther;
+        // if not already recalling, add the current line to the history list so
+        // we don't
+        // have to special case it
+        if (historyIndex == historyLen - 1) {
+          free(history[historyLen - 1]);
+          size_t tempBufferSize = sizeof(char32_t) * len + 1;
+          unique_ptr<char[]> tempBuffer(new char[tempBufferSize]);
+          copyString32to8(tempBuffer.get(), tempBufferSize, buf32);
+          history[historyLen - 1] = strdup8(tempBuffer.get());
+        }
+        if (historyLen > 1) {
+          if (c == UP_ARROW_KEY) {
+            c = ctrlChar('P');
+          }
+          if (historyPreviousIndex != -2 && c != ctrlChar('P')) {
+            historyIndex =
+                1 + historyPreviousIndex;  // emulate Windows down-arrow
+          } else {
+            historyIndex += (c == ctrlChar('P')) ? -1 : 1;
+          }
+          historyPreviousIndex = -2;
+          if (historyIndex < 0) {
+            historyIndex = 0;
+            break;
+          } else if (historyIndex >= historyLen) {
+            historyIndex = historyLen - 1;
+            break;
+          }
+          historyRecallMostRecent = true;
+          size_t ucharCount = 0;
+          copyString8to32(buf32, buflen, ucharCount, history[historyIndex]);
+          len = pos = static_cast<int>(ucharCount);
+          refreshLine(pi);
+        }
+        break;
+
+      case ctrlChar('R'):  // ctrl-R, reverse history search
+      case ctrlChar('S'):  // ctrl-S, forward history search
+        terminatingKeystroke = incrementalHistorySearch(pi, c);
+        break;
+
+      case ctrlChar('T'):  // ctrl-T, transpose characters
+        killRing.lastAction = KillRing::actionOther;
+        if (pos > 0 && len > 1) {
+          historyRecallMostRecent = false;
+          size_t leftCharPos = (pos == len) ? pos - 2 : pos - 1;
+          char32_t aux = buf32[leftCharPos];
+          buf32[leftCharPos] = buf32[leftCharPos + 1];
+          buf32[leftCharPos + 1] = aux;
+          if (pos != len) ++pos;
+          refreshLine(pi);
+        }
+        break;
+
+      case ctrlChar(
+          'U'):  // ctrl-U, kill all characters to the left of the cursor
+        if (pos > 0) {
+          historyRecallMostRecent = false;
+          killRing.kill(&buf32[0], pos, false);
+          len -= pos;
+          memmove(buf32, buf32 + pos, sizeof(char32_t) * (len + 1));
+          pos = 0;
+          refreshLine(pi);
+        }
+        killRing.lastAction = KillRing::actionKill;
+        break;
+
+      case META + 'u':  // meta-U, uppercase word
+      case META + 'U':
+        killRing.lastAction = KillRing::actionOther;
+        if (pos < len) {
+          historyRecallMostRecent = false;
+          while (pos < len && !isCharacterAlphanumeric(buf32[pos])) {
+            ++pos;
+          }
+          while (pos < len && isCharacterAlphanumeric(buf32[pos])) {
+            if (buf32[pos] >= 'a' && buf32[pos] <= 'z') {
+              buf32[pos] += 'A' - 'a';
+            }
+            ++pos;
+          }
+          refreshLine(pi);
+        }
+        break;
+
+      // ctrl-W, kill to whitespace (not word) to left of cursor
+      case ctrlChar('W'):
+        if (pos > 0) {
+          historyRecallMostRecent = false;
+          int startingPos = pos;
+          while (pos > 0 && buf32[pos - 1] == ' ') {
+            --pos;
+          }
+          while (pos > 0 && buf32[pos - 1] != ' ') {
+            --pos;
+          }
+          killRing.kill(&buf32[pos], startingPos - pos, false);
+          memmove(buf32 + pos, buf32 + startingPos,
+                  sizeof(char32_t) * (len - startingPos + 1));
+          len -= startingPos - pos;
+          refreshLine(pi);
+        }
+        killRing.lastAction = KillRing::actionKill;
+        break;
+
+      case ctrlChar('Y'):  // ctrl-Y, yank killed text
+        historyRecallMostRecent = false;
+        {
+          Utf32String* restoredText = killRing.yank();
+          if (restoredText) {
+            bool truncated = false;
+            size_t ucharCount = restoredText->length();
+            if (ucharCount > static_cast<size_t>(buflen - len)) {
+              ucharCount = buflen - len;
+              truncated = true;
+            }
+            memmove(buf32 + pos + ucharCount, buf32 + pos,
+                    sizeof(char32_t) * (len - pos + 1));
+            memmove(buf32 + pos, restoredText->get(),
+                    sizeof(char32_t) * ucharCount);
+            pos += static_cast<int>(ucharCount);
+            len += static_cast<int>(ucharCount);
+            refreshLine(pi);
+            killRing.lastAction = KillRing::actionYank;
+            killRing.lastYankSize = ucharCount;
+            if (truncated) {
+              beep();
+            }
+          } else {
+            beep();
+          }
+        }
+        break;
+
+      case META + 'y':  // meta-Y, "yank-pop", rotate popped text
+      case META + 'Y':
+        if (killRing.lastAction == KillRing::actionYank) {
+          historyRecallMostRecent = false;
+          Utf32String* restoredText = killRing.yankPop();
+          if (restoredText) {
+            bool truncated = false;
+            size_t ucharCount = restoredText->length();
+            if (ucharCount >
+                static_cast<size_t>(killRing.lastYankSize + buflen - len)) {
+              ucharCount = killRing.lastYankSize + buflen - len;
+              truncated = true;
+            }
+            if (ucharCount > killRing.lastYankSize) {
+              memmove(buf32 + pos + ucharCount - killRing.lastYankSize,
+                      buf32 + pos, sizeof(char32_t) * (len - pos + 1));
+              memmove(buf32 + pos - killRing.lastYankSize, restoredText->get(),
+                      sizeof(char32_t) * ucharCount);
+            } else {
+              memmove(buf32 + pos - killRing.lastYankSize, restoredText->get(),
+                      sizeof(char32_t) * ucharCount);
+              memmove(buf32 + pos + ucharCount - killRing.lastYankSize,
+                      buf32 + pos, sizeof(char32_t) * (len - pos + 1));
+            }
+            pos += static_cast<int>(ucharCount - killRing.lastYankSize);
+            len += static_cast<int>(ucharCount - killRing.lastYankSize);
+            killRing.lastYankSize = ucharCount;
+            refreshLine(pi);
+            if (truncated) {
+              beep();
+            }
+            break;
+          }
+        }
+        beep();
+        break;
+
+#ifndef _WIN32
+      case ctrlChar('Z'):  // ctrl-Z, job control
+        disableRawMode();  // Returning to Linux (whatever) shell, leave raw
+                           // mode
+        raise(SIGSTOP);    // Break out in mid-line
+        enableRawMode();   // Back from Linux shell, re-enter raw mode
+        if (!pi.write()) break;  // Redraw prompt
+        refreshLine(pi);         // Refresh the line
+        break;
+#endif
+
+      // DEL, delete the character under the cursor
+      case 127:
+      case DELETE_KEY:
+        killRing.lastAction = KillRing::actionOther;
+        if (len > 0 && pos < len) {
+          historyRecallMostRecent = false;
+          memmove(buf32 + pos, buf32 + pos + 1, sizeof(char32_t) * (len - pos));
+          --len;
+          refreshLine(pi);
+        }
+        break;
+
+      case META + '<':     // meta-<, beginning of history
+      case PAGE_UP_KEY:    // Page Up, beginning of history
+      case META + '>':     // meta->, end of history
+      case PAGE_DOWN_KEY:  // Page Down, end of history
+        killRing.lastAction = KillRing::actionOther;
+        // if not already recalling, add the current line to the history list so
+        // we don't
+        // have to special case it
+        if (historyIndex == historyLen - 1) {
+          free(history[historyLen - 1]);
+          size_t tempBufferSize = sizeof(char32_t) * len + 1;
+          unique_ptr<char[]> tempBuffer(new char[tempBufferSize]);
+          copyString32to8(tempBuffer.get(), tempBufferSize, buf32);
+          history[historyLen - 1] = strdup8(tempBuffer.get());
+        }
+        if (historyLen > 1) {
+          historyIndex =
+              (c == META + '<' || c == PAGE_UP_KEY) ? 0 : historyLen - 1;
+          historyPreviousIndex = -2;
+          historyRecallMostRecent = true;
+          size_t ucharCount = 0;
+          copyString8to32(buf32, buflen, ucharCount, history[historyIndex]);
+          len = pos = static_cast<int>(ucharCount);
+          refreshLine(pi);
+        }
+        break;
+
+      // not one of our special characters, maybe insert it in the buffer
+      default:
+        killRing.lastAction = KillRing::actionOther;
+        historyRecallMostRecent = false;
+        if (c & (META | CTRL)) {  // beep on unknown Ctrl and/or Meta keys
+          beep();
+          break;
+        }
+        if (len < buflen) {
+          if (isControlChar(c)) {  // don't insert control characters
+            beep();
+            break;
+          }
+          if (len == pos) {  // at end of buffer
+            buf32[pos] = c;
+            ++pos;
+            ++len;
+            buf32[len] = '\0';
+            int inputLen = calculateColumnPosition(buf32, len);
+            if (pi.promptIndentation + inputLen < pi.promptScreenColumns) {
+              if (inputLen > pi.promptPreviousInputLen)
+                pi.promptPreviousInputLen = inputLen;
+              /* Avoid a full update of the line in the
+               * trivial case. */
+              if (write32(1, reinterpret_cast<char32_t*>(&c), 1) == -1)
+                return -1;
+            } else {
+              refreshLine(pi);
+            }
+          } else {  // not at end of buffer, have to move characters to our
+                    // right
+            memmove(buf32 + pos + 1, buf32 + pos,
+                    sizeof(char32_t) * (len - pos));
+            buf32[pos] = c;
+            ++len;
+            ++pos;
+            buf32[len] = '\0';
+            refreshLine(pi);
+          }
+        } else {
+          beep();  // buffer is full, beep on new characters
+        }
+        break;
+    }
+  }
+  return len;
+}
+
+static string preloadedBufferContents;  // used with linenoisePreloadBuffer
+static string preloadErrorMessage;
+
+/**
+ * linenoisePreloadBuffer provides text to be inserted into the command buffer
+ *
+ * the provided text will be processed to be usable and will be used to preload
+ * the input buffer on the next call to linenoise()
+ *
+ * @param preloadText text to begin with on the next call to linenoise()
+ */
+void linenoisePreloadBuffer(const char* preloadText) {
+  if (!preloadText) {
+    return;
+  }
+  int bufferSize = static_cast<int>(strlen(preloadText) + 1);
+  unique_ptr<char[]> tempBuffer(new char[bufferSize]);
+  strncpy(&tempBuffer[0], preloadText, bufferSize);
+
+  // remove characters that won't display correctly
+  char* pIn = &tempBuffer[0];
+  char* pOut = pIn;
+  bool controlsStripped = false;
+  bool whitespaceSeen = false;
+  while (*pIn) {
+    unsigned char c =
+        *pIn++;       // we need unsigned so chars 0x80 and above are allowed
+    if ('\r' == c) {  // silently skip CR
+      continue;
+    }
+    if ('\n' == c || '\t' == c) {  // note newline or tab
+      whitespaceSeen = true;
+      continue;
+    }
+    if (isControlChar(
+            c)) {  // remove other control characters, flag for message
+      controlsStripped = true;
+      *pOut++ = ' ';
+      continue;
+    }
+    if (whitespaceSeen) {  // convert whitespace to a single space
+      *pOut++ = ' ';
+      whitespaceSeen = false;
+    }
+    *pOut++ = c;
+  }
+  *pOut = 0;
+  int processedLength = static_cast<int>(pOut - tempBuffer.get());
+  bool lineTruncated = false;
+  if (processedLength > (LINENOISE_MAX_LINE - 1)) {
+    lineTruncated = true;
+    tempBuffer[LINENOISE_MAX_LINE - 1] = 0;
+  }
+  preloadedBufferContents = tempBuffer.get();
+  if (controlsStripped) {
+    preloadErrorMessage +=
+        " [Edited line: control characters were converted to spaces]\n";
+  }
+  if (lineTruncated) {
+    preloadErrorMessage += " [Edited line: the line length was reduced from ";
+    char buf[128];
+    snprintf(buf, sizeof(buf), "%d to %d]\n", processedLength,
+             (LINENOISE_MAX_LINE - 1));
+    preloadErrorMessage += buf;
+  }
+}
+
+/**
+ * linenoise is a readline replacement.
+ *
+ * call it with a prompt to display and it will return a line of input from the
+ * user
+ *
+ * @param prompt text of prompt to display to the user
+ * @return       the returned string belongs to the caller on return and must be
+ * freed to prevent
+ *               memory leaks
+ */
+char* linenoise(const char* prompt) {
+#ifndef _WIN32
+  gotResize = false;
+#endif
+  if (isatty(STDIN_FILENO)) {  // input is from a terminal
+    char32_t buf32[LINENOISE_MAX_LINE];
+    char charWidths[LINENOISE_MAX_LINE];
+    if (!preloadErrorMessage.empty()) {
+      printf("%s", preloadErrorMessage.c_str());
+      fflush(stdout);
+      preloadErrorMessage.clear();
+    }
+    PromptInfo pi(prompt, getScreenColumns());
+    if (isUnsupportedTerm()) {
+      if (!pi.write()) return 0;
+      fflush(stdout);
+      if (preloadedBufferContents.empty()) {
+        unique_ptr<char[]> buf8(new char[LINENOISE_MAX_LINE]);
+        if (fgets(buf8.get(), LINENOISE_MAX_LINE, stdin) == NULL) {
+          return NULL;
+        }
+        size_t len = strlen(buf8.get());
+        while (len && (buf8[len - 1] == '\n' || buf8[len - 1] == '\r')) {
+          --len;
+          buf8[len] = '\0';
+        }
+        return strdup(buf8.get());  // caller must free buffer
+      } else {
+        char* buf8 = strdup(preloadedBufferContents.c_str());
+        preloadedBufferContents.clear();
+        return buf8;  // caller must free buffer
+      }
+    } else {
+      if (enableRawMode() == -1) {
+        return NULL;
+      }
+      InputBuffer ib(buf32, charWidths, LINENOISE_MAX_LINE);
+      if (!preloadedBufferContents.empty()) {
+        ib.preloadBuffer(preloadedBufferContents.c_str());
+        preloadedBufferContents.clear();
+      }
+      int count = ib.getInputLine(pi);
+      disableRawMode();
+      printf("\n");
+      if (count == -1) {
+        return NULL;
+      }
+      size_t bufferSize = sizeof(char32_t) * ib.length() + 1;
+      unique_ptr<char[]> buf8(new char[bufferSize]);
+      copyString32to8(buf8.get(), bufferSize, buf32);
+      return strdup(buf8.get());  // caller must free buffer
+    }
+  } else {  // input not from a terminal, we should work with piped input, i.e.
+            // redirected stdin
+    unique_ptr<char[]> buf8(new char[LINENOISE_MAX_LINE]);
+    if (fgets(buf8.get(), LINENOISE_MAX_LINE, stdin) == NULL) {
+      return NULL;
+    }
+
+    // if fgets() gave us the newline, remove it
+    int count = static_cast<int>(strlen(buf8.get()));
+    if (count > 0 && buf8[count - 1] == '\n') {
+      --count;
+      buf8[count] = '\0';
+    }
+    return strdup(buf8.get());  // caller must free buffer
+  }
+}
+
+/* Register a callback function to be called for tab-completion. */
+void linenoiseSetCompletionCallback(linenoiseCompletionCallback* fn) {
+  completionCallback = fn;
+}
+
+void linenoiseAddCompletion(linenoiseCompletions* lc, const char* str) {
+  lc->completionStrings.push_back(Utf32String(str));
+}
+
+int linenoiseHistoryAdd(const char* line) {
+  if (historyMaxLen == 0) {
+    return 0;
+  }
+  if (history == NULL) {
+    history =
+        reinterpret_cast<char8_t**>(malloc(sizeof(char8_t*) * historyMaxLen));
+    if (history == NULL) {
+      return 0;
+    }
+    memset(history, 0, (sizeof(char*) * historyMaxLen));
+  }
+  char8_t* linecopy = strdup8(line);
+  if (!linecopy) {
+    return 0;
+  }
+
+  // convert newlines in multi-line code to spaces before storing
+  char8_t* p = linecopy;
+  while (*p) {
+    if (*p == '\n') {
+      *p = ' ';
+    }
+    ++p;
+  }
+
+  // prevent duplicate history entries
+  if (historyLen > 0 && history[historyLen - 1] != nullptr &&
+      strcmp(reinterpret_cast<char const*>(history[historyLen - 1]),
+             reinterpret_cast<char const*>(linecopy)) == 0) {
+    free(linecopy);
+    return 0;
+  }
+
+  if (historyLen == historyMaxLen) {
+    free(history[0]);
+    memmove(history, history + 1, sizeof(char*) * (historyMaxLen - 1));
+    --historyLen;
+    if (--historyPreviousIndex < -1) {
+      historyPreviousIndex = -2;
+    }
+  }
+
+  history[historyLen] = linecopy;
+  ++historyLen;
+  return 1;
+}
+
+int linenoiseHistorySetMaxLen(int len) {
+  if (len < 1) {
+    return 0;
+  }
+  if (history) {
+    int tocopy = historyLen;
+    char8_t** newHistory =
+        reinterpret_cast<char8_t**>(malloc(sizeof(char8_t*) * len));
+    if (newHistory == NULL) {
+      return 0;
+    }
+    if (len < tocopy) {
+      tocopy = len;
+    }
+    memcpy(newHistory, history + historyMaxLen - tocopy,
+           sizeof(char8_t*) * tocopy);
+    free(history);
+    history = newHistory;
+  }
+  historyMaxLen = len;
+  if (historyLen > historyMaxLen) {
+    historyLen = historyMaxLen;
+  }
+  return 1;
+}
+
+/* Fetch a line of the history by (zero-based) index.  If the requested
+ * line does not exist, NULL is returned.  The return value is a heap-allocated
+ * copy of the line, and the caller is responsible for de-allocating it. */
+char* linenoiseHistoryLine(int index) {
+  if (index < 0 || index >= historyLen) return NULL;
+
+  return strdup(reinterpret_cast<char const*>(history[index]));
+}
+
+/* Save the history in the specified file. On success 0 is returned
+ * otherwise -1 is returned. */
+int linenoiseHistorySave(const char* filename) {
+#if _WIN32
+  FILE* fp = fopen(filename, "wt");
+#else
+  int fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR);
+
+  if (fd < 0) {
+    return -1;
+  }
+
+  FILE* fp = fdopen(fd, "wt");
+#endif
+
+  if (fp == NULL) {
+    return -1;
+  }
+
+  for (int j = 0; j < historyLen; ++j) {
+    if (history[j][0] != '\0') {
+      fprintf(fp, "%s\n", history[j]);
+    }
+  }
+
+  fclose(fp);
+
+  return 0;
+}
+
+/* Load the history from the specified file. If the file does not exist
+ * zero is returned and no operation is performed.
+ *
+ * If the file exists and the operation succeeded 0 is returned, otherwise
+ * on error -1 is returned. */
+int linenoiseHistoryLoad(const char* filename) {
+  FILE* fp = fopen(filename, "rt");
+  if (fp == NULL) {
+    return -1;
+  }
+
+  char buf[LINENOISE_MAX_LINE];
+  while (fgets(buf, LINENOISE_MAX_LINE, fp) != NULL) {
+    char* p = strchr(buf, '\r');
+    if (!p) {
+      p = strchr(buf, '\n');
+    }
+    if (p) {
+      *p = '\0';
+    }
+    if (p != buf) {
+      linenoiseHistoryAdd(buf);
+    }
+  }
+  fclose(fp);
+  return 0;
+}
+
+/* Set if to use or not the multi line mode. */
+/* note that this is a stub only, as linenoise-ng always multi-line */
+void linenoiseSetMultiLine(int) {}
+
+/* This special mode is used by linenoise in order to print scan codes
+ * on screen for debugging / development purposes. It is implemented
+ * by the linenoise_example program using the --keycodes option. */
+void linenoisePrintKeyCodes(void) {
+  char quit[4];
+
+  printf(
+      "Linenoise key codes debugging mode.\n"
+      "Press keys to see scan codes. Type 'quit' at any time to exit.\n");
+  if (enableRawMode() == -1) return;
+  memset(quit, ' ', 4);
+  while (1) {
+    char c;
+    int nread;
+
+#if _WIN32
+    nread = _read(STDIN_FILENO, &c, 1);
+#else
+    nread = read(STDIN_FILENO, &c, 1);
+#endif
+    if (nread <= 0) continue;
+    memmove(quit, quit + 1, sizeof(quit) - 1); /* shift string to left. */
+    quit[sizeof(quit) - 1] = c; /* Insert current char on the right. */
+    if (memcmp(quit, "quit", sizeof(quit)) == 0) break;
+
+    printf("'%c' %02x (%d) (type quit to exit)\n", isprint(c) ? c : '?', (int)c,
+           (int)c);
+    printf("\r"); /* Go left edge manually, we are in raw mode. */
+    fflush(stdout);
+  }
+  disableRawMode();
+}
+
+#ifndef _WIN32
+static void WindowSizeChanged(int) {
+  // do nothing here but setting this flag
+  gotResize = true;
+}
+#endif
+
+int linenoiseInstallWindowChangeHandler(void) {
+#ifndef _WIN32
+  struct sigaction sa;
+  sigemptyset(&sa.sa_mask);
+  sa.sa_flags = 0;
+  sa.sa_handler = &WindowSizeChanged;
+
+  if (sigaction(SIGWINCH, &sa, nullptr) == -1) {
+    return errno;
+  }
+#endif
+  return 0;
+}
+
+int linenoiseKeyType(void) {
+  return keyType;
+}
diff --git a/src/linenoise/linenoise.h b/src/linenoise/linenoise.h
index ed20232c5..3a8eb9f7e 100644
--- a/src/linenoise/linenoise.h
+++ b/src/linenoise/linenoise.h
@@ -1,70 +1,70 @@
-/* linenoise.h -- VERSION 1.0
- *
- * Guerrilla line editing library against the idea that a line editing lib
- * needs to be 20,000 lines of C code.
+/* linenoise.h -- guerrilla line editing library against the idea that a
+ * line editing lib needs to be 20,000 lines of C code.
  *
  * See linenoise.c for more information.
  *
- * ------------------------------------------------------------------------
- *
- * Copyright (c) 2010-2014, Salvatore Sanfilippo <antirez at gmail dot com>
- * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
  *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
+ * modification, are permitted provided that the following conditions are met:
  *
- *  *  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- *
- *  *  Redistributions in binary form must reproduce the above copyright
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
+ *   * Neither the name of Redis nor the names of its contributors may be used
+ *     to endorse or promote products derived from this software without
+ *     specific prior written permission.
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef __LINENOISE_H
 #define __LINENOISE_H
 
+#define LINENOISE_VERSION "1.0.0"
+#define LINENOISE_VERSION_MAJOR 1
+#define LINENOISE_VERSION_MINOR 1
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-typedef struct linenoiseCompletions {
-  size_t len;
-  char **cvec;
-} linenoiseCompletions;
+typedef struct linenoiseCompletions linenoiseCompletions;
 
-typedef void(linenoiseCompletionCallback)(const char *, linenoiseCompletions *);
-typedef char*(linenoiseHintsCallback)(const char *, int *color, int *bold);
-typedef void(linenoiseFreeHintsCallback)(void *);
-void linenoiseSetCompletionCallback(linenoiseCompletionCallback *);
-void linenoiseSetHintsCallback(linenoiseHintsCallback *);
-void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *);
-void linenoiseAddCompletion(linenoiseCompletions *, const char *);
+typedef void(linenoiseCompletionCallback)(const char*, linenoiseCompletions*);
+void linenoiseSetCompletionCallback(linenoiseCompletionCallback* fn);
+void linenoiseAddCompletion(linenoiseCompletions* lc, const char* str);
 
-char *linenoise(const char *prompt);
-void linenoiseFree(void *ptr);
-int linenoiseHistoryAdd(const char *line);
+char* linenoise(const char* prompt);
+void linenoisePreloadBuffer(const char* preloadText);
+int linenoiseHistoryAdd(const char* line);
 int linenoiseHistorySetMaxLen(int len);
-int linenoiseHistorySave(const char *filename);
-int linenoiseHistoryLoad(const char *filename);
+char* linenoiseHistoryLine(int index);
+int linenoiseHistorySave(const char* filename);
+int linenoiseHistoryLoad(const char* filename);
+void linenoiseHistoryFree(void);
 void linenoiseClearScreen(void);
 void linenoiseSetMultiLine(int ml);
 void linenoisePrintKeyCodes(void);
+/* the following are extensions to the original linenoise API */
+int linenoiseInstallWindowChangeHandler(void);
+/* returns type of key pressed: 1 = CTRL-C, 2 = CTRL-D, 0 = other */ 
+int linenoiseKeyType(void);
 
 #ifdef __cplusplus
 }
diff --git a/src/linenoise/wcwidth.cpp b/src/linenoise/wcwidth.cpp
new file mode 100644
index 000000000..deec0ba6b
--- /dev/null
+++ b/src/linenoise/wcwidth.cpp
@@ -0,0 +1,315 @@
+/*
+ * This is an implementation of wcwidth() and wcswidth() (defined in
+ * IEEE Std 1002.1-2001) for Unicode.
+ *
+ * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
+ * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
+ *
+ * In fixed-width output devices, Latin characters all occupy a single
+ * "cell" position of equal width, whereas ideographic CJK characters
+ * occupy two such cells. Interoperability between terminal-line
+ * applications and (teletype-style) character terminals using the
+ * UTF-8 encoding requires agreement on which character should advance
+ * the cursor by how many cell positions. No established formal
+ * standards exist at present on which Unicode character shall occupy
+ * how many cell positions on character terminals. These routines are
+ * a first attempt of defining such behavior based on simple rules
+ * applied to data provided by the Unicode Consortium.
+ *
+ * For some graphical characters, the Unicode standard explicitly
+ * defines a character-cell width via the definition of the East Asian
+ * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
+ * In all these cases, there is no ambiguity about which width a
+ * terminal shall use. For characters in the East Asian Ambiguous (A)
+ * class, the width choice depends purely on a preference of backward
+ * compatibility with either historic CJK or Western practice.
+ * Choosing single-width for these characters is easy to justify as
+ * the appropriate long-term solution, as the CJK practice of
+ * displaying these characters as double-width comes from historic
+ * implementation simplicity (8-bit encoded characters were displayed
+ * single-width and 16-bit ones double-width, even for Greek,
+ * Cyrillic, etc.) and not any typographic considerations.
+ *
+ * Much less clear is the choice of width for the Not East Asian
+ * (Neutral) class. Existing practice does not dictate a width for any
+ * of these characters. It would nevertheless make sense
+ * typographically to allocate two character cells to characters such
+ * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
+ * represented adequately with a single-width glyph. The following
+ * routines at present merely assign a single-cell width to all
+ * neutral characters, in the interest of simplicity. This is not
+ * entirely satisfactory and should be reconsidered before
+ * establishing a formal standard in this area. At the moment, the
+ * decision which Not East Asian (Neutral) characters should be
+ * represented by double-width glyphs cannot yet be answered by
+ * applying a simple rule from the Unicode database content. Setting
+ * up a proper standard for the behavior of UTF-8 character terminals
+ * will require a careful analysis not only of each Unicode character,
+ * but also of each presentation form, something the author of these
+ * routines has avoided to do so far.
+ *
+ * http://www.unicode.org/unicode/reports/tr11/
+ *
+ * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
+ *
+ * Permission to use, copy, modify, and distribute this software
+ * for any purpose and without fee is hereby granted. The author
+ * disclaims all warranties with regard to this software.
+ *
+ * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
+ */
+
+#include <wchar.h>
+#include <string>
+#include <memory>
+
+namespace linenoise_ng {
+
+struct interval {
+  char32_t first;
+  char32_t last;
+};
+
+/* auxiliary function for binary search in interval table */
+static int bisearch(char32_t ucs, const struct interval *table, int max) {
+  int min = 0;
+  int mid;
+
+  if (ucs < table[0].first || ucs > table[max].last)
+    return 0;
+  while (max >= min) {
+    mid = (min + max) / 2;
+    if (ucs > table[mid].last)
+      min = mid + 1;
+    else if (ucs < table[mid].first)
+      max = mid - 1;
+    else
+      return 1;
+  }
+
+  return 0;
+}
+
+
+/* The following two functions define the column width of an ISO 10646
+ * character as follows:
+ *
+ *    - The null character (U+0000) has a column width of 0.
+ *
+ *    - Other C0/C1 control characters and DEL will lead to a return
+ *      value of -1.
+ *
+ *    - Non-spacing and enclosing combining characters (general
+ *      category code Mn or Me in the Unicode database) have a
+ *      column width of 0.
+ *
+ *    - SOFT HYPHEN (U+00AD) has a column width of 1.
+ *
+ *    - Other format characters (general category code Cf in the Unicode
+ *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
+ *
+ *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
+ *      have a column width of 0.
+ *
+ *    - Spacing characters in the East Asian Wide (W) or East Asian
+ *      Full-width (F) category as defined in Unicode Technical
+ *      Report #11 have a column width of 2.
+ *
+ *    - All remaining characters (including all printable
+ *      ISO 8859-1 and WGL4 characters, Unicode control characters,
+ *      etc.) have a column width of 1.
+ *
+ * This implementation assumes that wchar_t characters are encoded
+ * in ISO 10646.
+ */
+
+int mk_wcwidth(char32_t ucs)
+{
+  /* sorted list of non-overlapping intervals of non-spacing characters */
+  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
+  static const struct interval combining[] = {
+    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
+    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
+    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
+    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
+    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
+    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
+    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
+    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
+    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
+    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
+    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
+    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
+    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
+    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
+    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
+    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
+    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
+    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
+    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
+    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
+    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
+    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
+    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
+    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
+    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
+    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
+    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
+    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
+    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
+    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
+    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
+    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
+    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
+    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
+    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
+    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
+    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
+    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
+    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
+    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
+    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
+    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
+    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
+    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
+    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
+    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
+    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
+    { 0xE0100, 0xE01EF }
+  };
+
+  /* test for 8-bit control characters */
+  if (ucs == 0)
+    return 0;
+  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
+    return -1;
+
+  /* binary search in table of non-spacing characters */
+  if (bisearch(ucs, combining,
+               sizeof(combining) / sizeof(struct interval) - 1))
+    return 0;
+
+  /* if we arrive here, ucs is not a combining or C0/C1 control character */
+
+  return 1 + 
+    (ucs >= 0x1100 &&
+     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
+      ucs == 0x2329 || ucs == 0x232a ||
+      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
+       ucs != 0x303f) ||                  /* CJK ... Yi */
+      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
+      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
+      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
+      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
+      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
+      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
+      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
+      (ucs >= 0x30000 && ucs <= 0x3fffd)));
+}
+
+
+int mk_wcswidth(const char32_t* pwcs, size_t n)
+{
+  int w, width = 0;
+
+  for (;*pwcs && n-- > 0; pwcs++)
+    if ((w = mk_wcwidth(*pwcs)) < 0)
+      return -1;
+    else
+      width += w;
+
+  return width;
+}
+
+
+/*
+ * The following functions are the same as mk_wcwidth() and
+ * mk_wcswidth(), except that spacing characters in the East Asian
+ * Ambiguous (A) category as defined in Unicode Technical Report #11
+ * have a column width of 2. This variant might be useful for users of
+ * CJK legacy encodings who want to migrate to UCS without changing
+ * the traditional terminal character-width behaviour. It is not
+ * otherwise recommended for general use.
+ */
+int mk_wcwidth_cjk(wchar_t ucs)
+{
+  /* sorted list of non-overlapping intervals of East Asian Ambiguous
+   * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
+  static const struct interval ambiguous[] = {
+    { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
+    { 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 },
+    { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
+    { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
+    { 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED },
+    { 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA },
+    { 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 },
+    { 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B },
+    { 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 },
+    { 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 },
+    { 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 },
+    { 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE },
+    { 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 },
+    { 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA },
+    { 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 },
+    { 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB },
+    { 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB },
+    { 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0391, 0x03A1 },
+    { 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 },
+    { 0x0401, 0x0401 }, { 0x0410, 0x044F }, { 0x0451, 0x0451 },
+    { 0x2010, 0x2010 }, { 0x2013, 0x2016 }, { 0x2018, 0x2019 },
+    { 0x201C, 0x201D }, { 0x2020, 0x2022 }, { 0x2024, 0x2027 },
+    { 0x2030, 0x2030 }, { 0x2032, 0x2033 }, { 0x2035, 0x2035 },
+    { 0x203B, 0x203B }, { 0x203E, 0x203E }, { 0x2074, 0x2074 },
+    { 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC },
+    { 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 },
+    { 0x2113, 0x2113 }, { 0x2116, 0x2116 }, { 0x2121, 0x2122 },
+    { 0x2126, 0x2126 }, { 0x212B, 0x212B }, { 0x2153, 0x2154 },
+    { 0x215B, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 },
+    { 0x2190, 0x2199 }, { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 },
+    { 0x21D4, 0x21D4 }, { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 },
+    { 0x2202, 0x2203 }, { 0x2207, 0x2208 }, { 0x220B, 0x220B },
+    { 0x220F, 0x220F }, { 0x2211, 0x2211 }, { 0x2215, 0x2215 },
+    { 0x221A, 0x221A }, { 0x221D, 0x2220 }, { 0x2223, 0x2223 },
+    { 0x2225, 0x2225 }, { 0x2227, 0x222C }, { 0x222E, 0x222E },
+    { 0x2234, 0x2237 }, { 0x223C, 0x223D }, { 0x2248, 0x2248 },
+    { 0x224C, 0x224C }, { 0x2252, 0x2252 }, { 0x2260, 0x2261 },
+    { 0x2264, 0x2267 }, { 0x226A, 0x226B }, { 0x226E, 0x226F },
+    { 0x2282, 0x2283 }, { 0x2286, 0x2287 }, { 0x2295, 0x2295 },
+    { 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF },
+    { 0x2312, 0x2312 }, { 0x2460, 0x24E9 }, { 0x24EB, 0x254B },
+    { 0x2550, 0x2573 }, { 0x2580, 0x258F }, { 0x2592, 0x2595 },
+    { 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 },
+    { 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 },
+    { 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 },
+    { 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, { 0x2605, 0x2606 },
+    { 0x2609, 0x2609 }, { 0x260E, 0x260F }, { 0x2614, 0x2615 },
+    { 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
+    { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
+    { 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
+    { 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
+    { 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
+  };
+
+  /* binary search in table of non-spacing characters */
+  if (bisearch(ucs, ambiguous,
+               sizeof(ambiguous) / sizeof(struct interval) - 1))
+    return 2;
+
+  return mk_wcwidth(ucs);
+}
+
+
+int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n)
+{
+  int w, width = 0;
+
+  for (;*pwcs && n-- > 0; pwcs++)
+    if ((w = mk_wcwidth_cjk(*pwcs)) < 0)
+      return -1;
+    else
+      width += w;
+
+  return width;
+}
+
+}
diff --git a/src/nix/local.mk b/src/nix/local.mk
index c7d2d328a..bddd53b16 100644
--- a/src/nix/local.mk
+++ b/src/nix/local.mk
@@ -2,7 +2,7 @@ programs += nix
 
 nix_DIR := $(d)
 
-nix_SOURCES := $(wildcard $(d)/*.cc) src/linenoise/linenoise.c
+nix_SOURCES := $(wildcard $(d)/*.cc) $(wildcard src/linenoise/*.cpp)
 
 nix_LIBS = libexpr libmain libstore libutil libformat
 
diff --git a/src/nix/repl.cc b/src/nix/repl.cc
index 28a8ebc8c..1adb816c5 100644
--- a/src/nix/repl.cc
+++ b/src/nix/repl.cc
@@ -185,7 +185,7 @@ void NixRepl::mainLoop(const std::vector<std::string> & files)
 bool NixRepl::getLine(string & input, const std::string &prompt)
 {
     char * s = linenoise(prompt.c_str());
-    Finally doFree([&]() { linenoiseFree(s); });
+    Finally doFree([&]() { free(s); });
     if (!s) return false;
     input += s;
     return true;