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-rw-r--r--src/libutil/error.cc251
1 files changed, 207 insertions, 44 deletions
diff --git a/src/libutil/error.cc b/src/libutil/error.cc
index 0fad9ae42..a4ee7afc2 100644
--- a/src/libutil/error.cc
+++ b/src/libutil/error.cc
@@ -7,14 +7,11 @@
namespace nix {
-
const std::string nativeSystem = SYSTEM;
-// addPrefix is used for show-trace. Strings added with addPrefix
-// will print ahead of the error itself.
-BaseError & BaseError::addPrefix(const FormatOrString & fs)
+BaseError & BaseError::addTrace(std::optional<ErrPos> e, hintformat hint)
{
- prefix_ = fs.s + prefix_;
+ err.traces.push_front(Trace { .pos = e, .hint = hint});
return *this;
}
@@ -28,7 +25,7 @@ const string& BaseError::calcWhat() const
err.name = sname();
std::ostringstream oss;
- oss << err;
+ showErrorInfo(oss, err, false);
what_ = oss.str();
return *what_;
@@ -56,28 +53,114 @@ string showErrPos(const ErrPos &errPos)
}
}
-// if nixCode contains lines of code, print them to the ostream, indicating the error column.
-void printCodeLines(std::ostream &out, const string &prefix, const NixCode &nixCode)
+std::optional<LinesOfCode> getCodeLines(const ErrPos &errPos)
+{
+ if (errPos.line <= 0)
+ return std::nullopt;
+
+ if (errPos.origin == foFile) {
+ LinesOfCode loc;
+ try {
+ AutoCloseFD fd = open(errPos.file.c_str(), O_RDONLY | O_CLOEXEC);
+ if (!fd) {
+ logError(SysError("opening file '%1%'", errPos.file).info());
+ return std::nullopt;
+ }
+ else
+ {
+ // count the newlines.
+ int count = 0;
+ string line;
+ int pl = errPos.line - 1;
+ do
+ {
+ line = readLine(fd.get());
+ ++count;
+ if (count < pl)
+ {
+ ;
+ }
+ else if (count == pl) {
+ loc.prevLineOfCode = line;
+ } else if (count == pl + 1) {
+ loc.errLineOfCode = line;
+ } else if (count == pl + 2) {
+ loc.nextLineOfCode = line;
+ break;
+ }
+ } while (true);
+ return loc;
+ }
+ }
+ catch (EndOfFile &eof) {
+ if (loc.errLineOfCode.has_value())
+ return loc;
+ else
+ return std::nullopt;
+ }
+ catch (std::exception &e) {
+ printError("error reading nix file: %s\n%s", errPos.file, e.what());
+ return std::nullopt;
+ }
+ } else {
+ std::istringstream iss(errPos.file);
+ // count the newlines.
+ int count = 0;
+ string line;
+ int pl = errPos.line - 1;
+
+ LinesOfCode loc;
+
+ do
+ {
+ std::getline(iss, line);
+ ++count;
+ if (count < pl)
+ {
+ ;
+ }
+ else if (count == pl) {
+ loc.prevLineOfCode = line;
+ } else if (count == pl + 1) {
+ loc.errLineOfCode = line;
+ } else if (count == pl + 2) {
+ loc.nextLineOfCode = line;
+ break;
+ }
+
+ if (!iss.good())
+ break;
+ } while (true);
+
+ return loc;
+ }
+}
+
+// print lines of code to the ostream, indicating the error column.
+void printCodeLines(std::ostream &out,
+ const string &prefix,
+ const ErrPos &errPos,
+ const LinesOfCode &loc)
{
// previous line of code.
- if (nixCode.prevLineOfCode.has_value()) {
+ if (loc.prevLineOfCode.has_value()) {
out << std::endl
<< fmt("%1% %|2$5d|| %3%",
- prefix,
- (nixCode.errPos.line - 1),
- *nixCode.prevLineOfCode);
+ prefix,
+ (errPos.line - 1),
+ *loc.prevLineOfCode);
}
- if (nixCode.errLineOfCode.has_value()) {
+ if (loc.errLineOfCode.has_value()) {
// line of code containing the error.
out << std::endl
<< fmt("%1% %|2$5d|| %3%",
- prefix,
- (nixCode.errPos.line),
- *nixCode.errLineOfCode);
+ prefix,
+ (errPos.line),
+ *loc.errLineOfCode);
// error arrows for the column range.
- if (nixCode.errPos.column > 0) {
- int start = nixCode.errPos.column;
+ if (errPos.column > 0) {
+ int start = errPos.column;
std::string spaces;
for (int i = 0; i < start; ++i) {
spaces.append(" ");
@@ -87,23 +170,49 @@ void printCodeLines(std::ostream &out, const string &prefix, const NixCode &nixC
out << std::endl
<< fmt("%1% |%2%" ANSI_RED "%3%" ANSI_NORMAL,
- prefix,
- spaces,
- arrows);
+ prefix,
+ spaces,
+ arrows);
}
}
// next line of code.
- if (nixCode.nextLineOfCode.has_value()) {
+ if (loc.nextLineOfCode.has_value()) {
out << std::endl
<< fmt("%1% %|2$5d|| %3%",
- prefix,
- (nixCode.errPos.line + 1),
- *nixCode.nextLineOfCode);
+ prefix,
+ (errPos.line + 1),
+ *loc.nextLineOfCode);
+ }
+}
+
+void printAtPos(const string &prefix, const ErrPos &pos, std::ostream &out)
+{
+ if (pos)
+ {
+ switch (pos.origin) {
+ case foFile: {
+ out << prefix << ANSI_BLUE << "at: " << ANSI_YELLOW << showErrPos(pos) <<
+ ANSI_BLUE << " in file: " << ANSI_NORMAL << pos.file;
+ break;
+ }
+ case foString: {
+ out << prefix << ANSI_BLUE << "at: " << ANSI_YELLOW << showErrPos(pos) <<
+ ANSI_BLUE << " from string" << ANSI_NORMAL;
+ break;
+ }
+ case foStdin: {
+ out << prefix << ANSI_BLUE << "at: " << ANSI_YELLOW << showErrPos(pos) <<
+ ANSI_BLUE << " from stdin" << ANSI_NORMAL;
+ break;
+ }
+ default:
+ throw Error("invalid FileOrigin in errPos");
+ }
}
}
-std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo)
+std::ostream& showErrorInfo(std::ostream &out, const ErrorInfo &einfo, bool showTrace)
{
auto errwidth = std::max<size_t>(getWindowSize().second, 20);
string prefix = "";
@@ -158,8 +267,12 @@ std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo)
}
}
- auto ndl = prefix.length() + levelString.length() + 3 + einfo.name.length() + einfo.programName.value_or("").length();
- auto dashwidth = ndl > (errwidth - 3) ? 3 : errwidth - ndl;
+ auto ndl = prefix.length()
+ + filterANSIEscapes(levelString, true).length()
+ + 7
+ + einfo.name.length()
+ + einfo.programName.value_or("").length();
+ auto dashwidth = std::max<int>(errwidth - ndl, 3);
std::string dashes(dashwidth, '-');
@@ -179,16 +292,9 @@ std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo)
einfo.programName.value_or(""));
bool nl = false; // intersperse newline between sections.
- if (einfo.nixCode.has_value()) {
- if (einfo.nixCode->errPos.file != "") {
- // filename, line, column.
- out << std::endl << fmt("%1%in file: " ANSI_BLUE "%2% %3%" ANSI_NORMAL,
- prefix,
- einfo.nixCode->errPos.file,
- showErrPos(einfo.nixCode->errPos));
- } else {
- out << std::endl << fmt("%1%from command line argument", prefix);
- }
+ if (einfo.errPos.has_value() && (*einfo.errPos)) {
+ out << prefix << std::endl;
+ printAtPos(prefix, *einfo.errPos, out);
nl = true;
}
@@ -200,12 +306,16 @@ std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo)
nl = true;
}
- // lines of code.
- if (einfo.nixCode.has_value() && einfo.nixCode->errLineOfCode.has_value()) {
- if (nl)
- out << std::endl << prefix;
- printCodeLines(out, prefix, *einfo.nixCode);
- nl = true;
+ if (einfo.errPos.has_value() && (*einfo.errPos)) {
+ auto loc = getCodeLines(*einfo.errPos);
+
+ // lines of code.
+ if (loc.has_value()) {
+ if (nl)
+ out << std::endl << prefix;
+ printCodeLines(out, prefix, *einfo.errPos, *loc);
+ nl = true;
+ }
}
// hint
@@ -216,6 +326,59 @@ std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo)
nl = true;
}
+ // traces
+ if (showTrace && !einfo.traces.empty())
+ {
+ const string tracetitle(" show-trace ");
+
+ int fill = errwidth - tracetitle.length();
+ int lw = 0;
+ int rw = 0;
+ const int min_dashes = 3;
+ if (fill > min_dashes * 2) {
+ if (fill % 2 != 0) {
+ lw = fill / 2;
+ rw = lw + 1;
+ }
+ else
+ {
+ lw = rw = fill / 2;
+ }
+ }
+ else
+ lw = rw = min_dashes;
+
+ if (nl)
+ out << std::endl << prefix;
+
+ out << ANSI_BLUE << std::string(lw, '-') << tracetitle << std::string(rw, '-') << ANSI_NORMAL;
+
+ for (auto iter = einfo.traces.rbegin(); iter != einfo.traces.rend(); ++iter)
+ {
+ try {
+ out << std::endl << prefix;
+ out << ANSI_BLUE << "trace: " << ANSI_NORMAL << iter->hint.str();
+
+ nl = true;
+ if (*iter->pos) {
+ auto pos = iter->pos.value();
+ out << std::endl << prefix;
+
+ printAtPos(prefix, pos, out);
+ auto loc = getCodeLines(pos);
+ if (loc.has_value())
+ {
+ out << std::endl << prefix;
+ printCodeLines(out, prefix, pos, *loc);
+ out << std::endl << prefix;
+ }
+ }
+ } catch(const std::bad_optional_access& e) {
+ out << iter->hint.str() << std::endl;
+ }
+ }
+ }
+
return out;
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 16:28:18 +0000