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#include "error.hh"
#include <iostream>
#include <optional>
namespace nix {
using std::cout;
using std::endl;
using std::nullopt;
optional<string> ErrorInfo::programName = nullopt;
// return basic_format?
string showErrLine(ErrLine &errLine)
{
if (errLine.columnRange.has_value())
{
return (format("(%1%:%2%)") % errLine.lineNumber % errLine.columnRange->start).str();
}
else
{
return (format("(%1%)") % errLine.lineNumber).str();
};
}
void printCodeLines(string &prefix, NixCode &nixCode)
{
if (nixCode.errLine.has_value())
{
// previous line of code.
if (nixCode.errLine->prevLineOfCode.has_value()) {
cout << format("%1% %|2$5d|| %3%")
% prefix
% (nixCode.errLine->lineNumber - 1)
% *nixCode.errLine->prevLineOfCode
<< endl;
}
// line of code containing the error.%2$+5d%
cout << format("%1% %|2$5d|| %3%")
% prefix
% (nixCode.errLine->lineNumber)
% nixCode.errLine->errLineOfCode
<< endl;
// error arrows for the column range.
if (nixCode.errLine->columnRange.has_value())
{
int start = nixCode.errLine->columnRange->start;
std::string spaces;
for (int i = 0; i < start; ++i)
{
spaces.append(" ");
}
int len = nixCode.errLine->columnRange->len;
std::string arrows;
for (int i = 0; i < len; ++i)
{
arrows.append("^");
}
cout << format("%1% |%2%" ANSI_RED "%3%" ANSI_NORMAL) % prefix % spaces % arrows << endl;
}
// next line of code.
if (nixCode.errLine->nextLineOfCode.has_value()) {
cout << format("%1% %|2$5d|| %3%")
% prefix
% (nixCode.errLine->lineNumber + 1)
% *nixCode.errLine->nextLineOfCode
<< endl;
}
}
}
void printErrorInfo(ErrorInfo &einfo)
{
int errwidth = 80;
string prefix = " ";
string levelString;
switch (einfo.level)
{
case ErrLevel::elError:
{
levelString = ANSI_RED;
levelString += "error:";
levelString += ANSI_NORMAL;
break;
}
case ErrLevel::elWarning:
{
levelString = ANSI_YELLOW;
levelString += "warning:";
levelString += ANSI_NORMAL;
break;
}
default:
{
levelString = (format("invalid error level: %1%") % einfo.level).str();
break;
}
}
int ndl = prefix.length() + levelString.length() + 3 + einfo.name.length() + einfo.programName.value_or("").length();
int dashwidth = ndl > (errwidth - 3) ? 3 : errwidth - ndl;
string dashes;
for (int i = 0; i < dashwidth; ++i)
dashes.append("-");
// divider.
cout << format("%1%%2%" ANSI_BLUE " %3% %4% %5% %6%" ANSI_NORMAL)
% prefix
% levelString
% "---"
% einfo.name
% dashes
% einfo.programName.value_or("")
<< endl;
// filename.
if (einfo.nixCode.has_value())
{
if (einfo.nixCode->nixFile.has_value())
{
string eline = einfo.nixCode->errLine.has_value()
? string(" ") + showErrLine(*einfo.nixCode->errLine)
: "";
cout << format("%1%in file: " ANSI_BLUE "%2%%3%" ANSI_NORMAL)
% prefix % *einfo.nixCode->nixFile % eline << endl;
cout << prefix << endl;
}
else
{
cout << format("%1%from command line argument") % prefix << endl;
cout << prefix << endl;
}
}
// description
cout << prefix << einfo.description << endl;
cout << prefix << endl;
// lines of code.
if (einfo.nixCode.has_value())
{
printCodeLines(prefix, *einfo.nixCode);
cout << prefix << endl;
}
// hint
if (einfo.hint.has_value())
{
cout << prefix << *einfo.hint << endl;
cout << prefix << endl;
}
}
}
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