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nix: allow using --file - to read from stdin

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This commit is contained in:
Artturin 2022-03-16 20:48:50 +02:00
parent d5322698a2
commit a5c969db49
2 changed files with 9 additions and 2 deletions
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2
doc/manual/src/release-notes/rl-next.md
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@ -1 +1,3 @@
# Release X.Y (202?-??-??)
* Various nix commands can now read expressions from stdin with `--file -`.

9
src/libcmd/installables.cc
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@ -134,7 +134,9 @@ SourceExprCommand::SourceExprCommand()
addFlag({
.longName = "file",
.shortName = 'f',
.description = "Interpret installables as attribute paths relative to the Nix expression stored in *file*.",
.description =
"Interpret installables as attribute paths relative to the Nix expression stored in *file*. "
"If *file* is the character -, then a Nix expression will be read from standard input.",
.category = installablesCategory,
.labels = {"file"},
.handler = {&file},
@ -695,7 +697,10 @@ std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
auto state = getEvalState();
auto vFile = state->allocValue();
if (file)
if (file == "-") {
auto e = state->parseStdin();
state->eval(e, *vFile);
} else if (file)
state->evalFile(lookupFileArg(*state, *file), *vFile);
else {
auto e = state->parseExprFromString(*expr, absPath("."));