diff options
Diffstat (limited to 'src/libutil/error.cc')
| -rw-r--r-- | src/libutil/error.cc | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/src/libutil/error.cc b/src/libutil/error.cc new file mode 100644 index 000000000..0fad9ae42 --- /dev/null +++ b/src/libutil/error.cc @@ -0,0 +1,221 @@ +#include "error.hh" + +#include <iostream> +#include <optional> +#include "serialise.hh" +#include <sstream> + +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) +{ + prefix_ = fs.s + prefix_; + return *this; +} + +// c++ std::exception descendants must have a 'const char* what()' function. +// This stringifies the error and caches it for use by what(), or similarly by msg(). +const string& BaseError::calcWhat() const +{ + if (what_.has_value()) + return *what_; + else { + err.name = sname(); + + std::ostringstream oss; + oss << err; + what_ = oss.str(); + + return *what_; + } +} + +std::optional<string> ErrorInfo::programName = std::nullopt; + +std::ostream& operator<<(std::ostream &os, const hintformat &hf) +{ + return os << hf.str(); +} + +string showErrPos(const ErrPos &errPos) +{ + if (errPos.line > 0) { + if (errPos.column > 0) { + return fmt("(%1%:%2%)", errPos.line, errPos.column); + } else { + return fmt("(%1%)", errPos.line); + } + } + else { + return ""; + } +} + +// 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) +{ + // previous line of code. + if (nixCode.prevLineOfCode.has_value()) { + out << std::endl + << fmt("%1% %|2$5d|| %3%", + prefix, + (nixCode.errPos.line - 1), + *nixCode.prevLineOfCode); + } + + if (nixCode.errLineOfCode.has_value()) { + // line of code containing the error. + out << std::endl + << fmt("%1% %|2$5d|| %3%", + prefix, + (nixCode.errPos.line), + *nixCode.errLineOfCode); + // error arrows for the column range. + if (nixCode.errPos.column > 0) { + int start = nixCode.errPos.column; + std::string spaces; + for (int i = 0; i < start; ++i) { + spaces.append(" "); + } + + std::string arrows("^"); + + out << std::endl + << fmt("%1% |%2%" ANSI_RED "%3%" ANSI_NORMAL, + prefix, + spaces, + arrows); + } + } + + // next line of code. + if (nixCode.nextLineOfCode.has_value()) { + out << std::endl + << fmt("%1% %|2$5d|| %3%", + prefix, + (nixCode.errPos.line + 1), + *nixCode.nextLineOfCode); + } +} + +std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo) +{ + auto errwidth = std::max<size_t>(getWindowSize().second, 20); + string prefix = ""; + + string levelString; + switch (einfo.level) { + case Verbosity::lvlError: { + levelString = ANSI_RED; + levelString += "error:"; + levelString += ANSI_NORMAL; + break; + } + case Verbosity::lvlWarn: { + levelString = ANSI_YELLOW; + levelString += "warning:"; + levelString += ANSI_NORMAL; + break; + } + case Verbosity::lvlInfo: { + levelString = ANSI_GREEN; + levelString += "info:"; + levelString += ANSI_NORMAL; + break; + } + case Verbosity::lvlTalkative: { + levelString = ANSI_GREEN; + levelString += "talk:"; + levelString += ANSI_NORMAL; + break; + } + case Verbosity::lvlChatty: { + levelString = ANSI_GREEN; + levelString += "chat:"; + levelString += ANSI_NORMAL; + break; + } + case Verbosity::lvlVomit: { + levelString = ANSI_GREEN; + levelString += "vomit:"; + levelString += ANSI_NORMAL; + break; + } + case Verbosity::lvlDebug: { + levelString = ANSI_YELLOW; + levelString += "debug:"; + levelString += ANSI_NORMAL; + break; + } + default: { + levelString = fmt("invalid error level: %1%", einfo.level); + break; + } + } + + auto ndl = prefix.length() + levelString.length() + 3 + einfo.name.length() + einfo.programName.value_or("").length(); + auto dashwidth = ndl > (errwidth - 3) ? 3 : errwidth - ndl; + + std::string dashes(dashwidth, '-'); + + // divider. + if (einfo.name != "") + out << fmt("%1%%2%" ANSI_BLUE " --- %3% %4% %5%" ANSI_NORMAL, + prefix, + levelString, + einfo.name, + dashes, + einfo.programName.value_or("")); + else + out << fmt("%1%%2%" ANSI_BLUE " -----%3% %4%" ANSI_NORMAL, + prefix, + levelString, + dashes, + 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); + } + nl = true; + } + + // description + if (einfo.description != "") { + if (nl) + out << std::endl << prefix; + out << std::endl << prefix << einfo.description; + 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; + } + + // hint + if (einfo.hint.has_value()) { + if (nl) + out << std::endl << prefix; + out << std::endl << prefix << *einfo.hint; + nl = true; + } + + return out; +} +} |