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get code lines from the nix file

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This commit is contained in:
Ben Burdette 2020-05-20 17:25:02 -06:00
parent 92123c6c79
commit 85ce455b85
1 changed files with 60 additions and 9 deletions
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57
src/libutil/error.cc
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@ -53,6 +53,52 @@ string showErrPos(const ErrPos &errPos)
}
}
void getCodeLines(NixCode &nixCode)
{
if (nixCode.errPos.line <= 0)
return;
// check this magic value!
if (nixCode.errPos.file == "(string)")
return;
try {
AutoCloseFD fd = open(nixCode.errPos.file.c_str(), O_RDONLY | O_CLOEXEC);
if (!fd)
throw SysError("opening file '%1%'", nixCode.errPos.file);
// count the newlines.
int count = 0;
string line;
int pl = nixCode.errPos.line - 1;
do
{
line = readLine(fd.get());
++count;
if (count < pl)
{
;
}
else if (count == pl) {
nixCode.prevLineOfCode = line;
} else if (count == pl + 1) {
nixCode.errLineOfCode = line;
} else if (count == pl + 2) {
nixCode.nextLineOfCode = line;
break;
}
} while (true);
}
catch (EndOfFile &eof) {
;
}
catch (std::exception &e) {
printError("error reading nix file: %s\n%s", nixCode.errPos.file, e.what());
}
}
void printCodeLines(std::ostream &out, const string &prefix, const NixCode &nixCode)
{
// previous line of code.
@ -197,16 +243,21 @@ std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo)
out << prefix << std::endl;
}
if (einfo.nixCode.has_value()) {
NixCode nixcode = *einfo.nixCode;
getCodeLines(nixcode);
// lines of code.
if (einfo.nixCode.has_value() && einfo.nixCode->errLineOfCode.has_value()) {
printCodeLines(out, prefix, *einfo.nixCode);
if (nixcode.errLineOfCode.has_value()) {
printCodeLines(out, prefix, nixcode);
out << prefix << std::endl;
}
// hint
if (einfo.hint.has_value()) {
out << prefix << *einfo.hint << std::endl;
out << prefix << std::endl;
}
return out;