Merge pull request #6270 from Artturin/stdineval

nix: allow using --file - to read from stdin
This commit is contained in:
Théophane Hufschmitt 2022-03-17 14:35:01 +01:00 committed by GitHub
commit 7117053457
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5 changed files with 44 additions and 2 deletions

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@ -1 +1,3 @@
# Release X.Y (202?-??-??)
* Various nix commands can now read expressions from stdin with `--file -`.

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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("."));

5
tests/eval.nix Normal file
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@ -0,0 +1,5 @@
{
int = 123;
str = "foo";
attr.foo = "bar";
}

29
tests/eval.sh Normal file
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@ -0,0 +1,29 @@
source common.sh
clearStore
testStdinHeredoc=$(nix eval -f - <<EOF
{
bar = 3 + 1;
foo = 2 + 2;
}
EOF
)
[[ $testStdinHeredoc == '{ bar = 4; foo = 4; }' ]]
nix eval --expr 'assert 1 + 2 == 3; true'
[[ $(nix eval int -f "./eval.nix") == 123 ]]
[[ $(nix eval str -f "./eval.nix") == '"foo"' ]]
[[ $(nix eval str --raw -f "./eval.nix") == 'foo' ]]
[[ $(nix eval attr -f "./eval.nix") == '{ foo = "bar"; }' ]]
[[ $(nix eval attr --json -f "./eval.nix") == '{"foo":"bar"}' ]]
[[ $(nix eval int -f - < "./eval.nix") == 123 ]]
nix-instantiate --eval -E 'assert 1 + 2 == 3; true'
[[ $(nix-instantiate -A int --eval "./eval.nix") == 123 ]]
[[ $(nix-instantiate -A str --eval "./eval.nix") == '"foo"' ]]
[[ $(nix-instantiate -A attr --eval "./eval.nix") == '{ foo = "bar"; }' ]]
[[ $(nix-instantiate -A attr --eval --json "./eval.nix") == '{"foo":"bar"}' ]]
[[ $(nix-instantiate -A int --eval - < "./eval.nix") == 123 ]]

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@ -53,6 +53,7 @@ nix_tests = \
build-remote-content-addressed-floating.sh \
nar-access.sh \
pure-eval.sh \
eval.sh \
ca/post-hook.sh \
repl.sh \
ca/repl.sh \