lix/src/libutil/error.cc

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#include "error.hh"
#include <iostream>
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#include <optional>
#include "serialise.hh"
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#include <sstream>
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namespace nix {
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const std::string nativeSystem = SYSTEM;
BaseError & BaseError::addPrefix(const FormatOrString & fs)
{
prefix_ = fs.s + prefix_;
return *this;
}
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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;
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std::ostream& operator<<(std::ostream &os, const hintformat &hf)
{
return os << hf.str();
}
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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 "";
}
}
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void getCodeLines(NixCode &nixCode)
{
if (nixCode.errPos.line <= 0)
return;
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if (nixCode.errPos.origin == foFile) {
try {
AutoCloseFD fd = open(nixCode.errPos.file.c_str(), O_RDONLY | O_CLOEXEC);
if (!fd)
logError(SysError("opening file '%1%'", nixCode.errPos.file).info());
else
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{
// count the newlines.
int count = 0;
string line;
int pl = nixCode.errPos.line - 1;
do
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{
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);
}
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}
catch (EndOfFile &eof) {
;
}
catch (std::exception &e) {
printError("error reading nix file: %s\n%s", nixCode.errPos.file, e.what());
}
} else {
std::istringstream iss(nixCode.errPos.file);
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// count the newlines.
int count = 0;
string line;
int pl = nixCode.errPos.line - 1;
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do
{
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std::getline(iss, line);
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++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;
}
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if (!iss.good())
break;
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} while (true);
}
}
void printCodeLines(std::ostream &out, const string &prefix, const NixCode &nixCode)
{
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// previous line of code.
if (nixCode.prevLineOfCode.has_value()) {
out << fmt("%1% %|2$5d|| %3%",
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prefix,
(nixCode.errPos.line - 1),
*nixCode.prevLineOfCode)
<< std::endl;
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}
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if (nixCode.errLineOfCode.has_value()) {
// line of code containing the error.
out << fmt("%1% %|2$5d|| %3%",
prefix,
(nixCode.errPos.line),
*nixCode.errLineOfCode)
<< std::endl;
// 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("^");
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out << fmt("%1% |%2%" ANSI_RED "%3%" ANSI_NORMAL,
prefix,
spaces,
arrows) << std::endl;
}
}
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// next line of code.
if (nixCode.nextLineOfCode.has_value()) {
out << fmt("%1% %|2$5d|| %3%",
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prefix,
(nixCode.errPos.line + 1),
*nixCode.nextLineOfCode)
<< std::endl;
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}
}
std::ostream& operator<<(std::ostream &out, const ErrorInfo &einfo)
{
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int errwidth = 80;
string prefix = "";
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string levelString;
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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;
}
}
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int ndl = prefix.length() + levelString.length() + 3 + einfo.name.length() + einfo.programName.value_or("").length();
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int dashwidth = ndl > (errwidth - 3) ? 3 : errwidth - ndl;
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string dashes;
for (int i = 0; i < dashwidth; ++i)
dashes.append("-");
// divider.
if (einfo.name != "")
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out << fmt("%1%%2%" ANSI_BLUE " --- %3% %4% %5%" ANSI_NORMAL,
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prefix,
levelString,
einfo.name,
dashes,
einfo.programName.value_or(""))
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<< std::endl;
else
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out << fmt("%1%%2%" ANSI_BLUE " -----%3% %4%" ANSI_NORMAL,
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prefix,
levelString,
dashes,
einfo.programName.value_or(""))
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<< std::endl;
// filename, line, column.
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if (einfo.nixCode.has_value()) {
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switch (einfo.nixCode->errPos.origin) {
case foFile: {
out << fmt("%1%in file: " ANSI_BLUE "%2% %3%" ANSI_NORMAL,
prefix,
einfo.nixCode->errPos.file,
showErrPos(einfo.nixCode->errPos)) << std::endl;
out << prefix << std::endl;
break;
}
case foString: {
out << fmt("%1%from command line argument %2%", prefix, showErrPos(einfo.nixCode->errPos)) << std::endl;
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out << prefix << std::endl;
break;
}
case foStdin: {
out << fmt("%1%from stdin %2%", prefix, showErrPos(einfo.nixCode->errPos)) << std::endl;
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out << prefix << std::endl;
break;
}
default:
throw Error("invalid FileOrigin in errPos");
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}
}
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// description
if (einfo.description != "") {
out << prefix << einfo.description << std::endl;
out << prefix << std::endl;
}
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if (einfo.nixCode.has_value()) {
NixCode nixcode = *einfo.nixCode;
getCodeLines(nixcode);
// lines of code.
if (nixcode.errLineOfCode.has_value()) {
printCodeLines(out, prefix, nixcode);
out << prefix << std::endl;
}
}
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// hint
if (einfo.hint.has_value()) {
out << prefix << *einfo.hint << std::endl;
out << prefix << std::endl;
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}
return out;
}
}