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Remove some blank lines from stack traces

Browse source 
This keeps hint messages, source location information, and source code
snippets grouped together, while making stack traces shorter (so that
more stack frames can be viewed on the same terminal).

Before:

    error:
           … while evaluating the attribute 'body'

             at /Users/wiggles/nix/tests/functional/lang/eval-fail-assert.nix:4:3:

                3|
                4|   body = x "x";
                 |   ^
                5| }

           … from call site

             at /Users/wiggles/nix/tests/functional/lang/eval-fail-assert.nix:4:10:

                3|
                4|   body = x "x";
                 |          ^
                5| }

           … while calling 'x'

             at /Users/wiggles/nix/tests/functional/lang/eval-fail-assert.nix:2:7:

                1| let {
                2|   x = arg: assert arg == "y"; 123;
                 |       ^
                3|

           error: assertion '(arg == "y")' failed

           at /Users/wiggles/nix/tests/functional/lang/eval-fail-assert.nix:2:12:

                1| let {
                2|   x = arg: assert arg == "y"; 123;
                 |            ^
                3|

After:

    error:
           … while evaluating the attribute 'body'
             at /Users/wiggles/nix/tests/functional/lang/eval-fail-assert.nix:4:3:
                3|
                4|   body = x "x";
                 |   ^
                5| }

           … from call site
             at /Users/wiggles/nix/tests/functional/lang/eval-fail-assert.nix:4:10:
                3|
                4|   body = x "x";
                 |          ^
                5| }

           … while calling 'x'
             at /Users/wiggles/nix/tests/functional/lang/eval-fail-assert.nix:2:7:
                1| let {
                2|   x = arg: assert arg == "y"; 123;
                 |       ^
                3|

           error: assertion '(arg == "y")' failed
           at /Users/wiggles/nix/tests/functional/lang/eval-fail-assert.nix:2:12:
                1| let {
                2|   x = arg: assert arg == "y"; 123;
                 |            ^
                3|
This commit is contained in:
Rebecca Turner 2023-12-15 23:56:17 -08:00
parent 419a64f9e0
commit 5cb98095ba
No known key found for this signature in database
45 changed files with 1 additions and 140 deletions
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3
src/libutil/error.cc
View file

@ -173,10 +173,9 @@ static bool printUnknownLocations = getEnv("_NIX_EVAL_SHOW_UNKNOWN_LOCATIONS").h
static bool printPosMaybe(std::ostream & oss, std::string_view indent, const std::shared_ptr<AbstractPos> & pos) {
bool hasPos = pos && *pos;
if (hasPos) {
oss << "\n" << indent << ANSI_BLUE << "at " ANSI_WARNING << *pos << ANSI_NORMAL << ":";
oss << indent << ANSI_BLUE << "at " ANSI_WARNING << *pos << ANSI_NORMAL << ":";
if (auto loc = pos->getCodeLines()) {
oss << "\n";
printCodeLines(oss, "", *pos, *loc);
oss << "\n";
}