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traces: Add _NIX_DEVELOPER_SHOW_UNKNOWN_LOCATIONS

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This commit is contained in:
Robert Hensing 2023-09-03 14:08:03 +02:00
parent f1aeeea32b
commit 477bc617bb
1 changed files with 11 additions and 0 deletions
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11
src/libutil/error.cc
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@ -155,6 +155,15 @@ static std::string indent(std::string_view indentFirst, std::string_view indentR
return res;
}
/**
* A development aid for finding missing positions, to improve error messages. Example use:
*
* NIX_DEVELOPER_SHOW_UNKNOWN_LOCATIONS=1 _NIX_TEST_ACCEPT=1 make tests/lang.sh.test
* git diff -U20 tests
*
*/
static bool printUnknownLocations = getEnv("_NIX_DEVELOPER_SHOW_UNKNOWN_LOCATIONS").has_value();
/**
* Print a position, if it is known.
*
@ -170,6 +179,8 @@ static bool printPosMaybe(std::ostream & oss, std::string_view indent, const std
printCodeLines(oss, "", *pos, *loc);
oss << "\n";
}
} else if (printUnknownLocations) {
oss << "\n" << indent << ANSI_BLUE << "at " ANSI_RED << "UNKNOWN LOCATION" << ANSI_NORMAL << "\n";
}
return hasPos;
}