lix/tests/suggestions.sh
regnat 0c6e46e349 Add some suggestions to the evaluator
Make the evaluator show some suggestions when trying to access an
invalid field from an attrset.

```console
$ nix eval --expr '{ foo = 1; }.foa'
error: attribute 'foa' missing

       at «string»:1:1:

            1| { foo = 1; }.foa
             | ^
       Did you mean foo?
```
2022-03-08 06:21:45 +01:00

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source common.sh
clearStore
cd "$TEST_HOME"
cat <<EOF > flake.nix
{
outputs = a: {
packages.$system = {
foo = 1;
fo1 = 1;
fo2 = 1;
fooo = 1;
foooo = 1;
fooooo = 1;
fooooo1 = 1;
fooooo2 = 1;
fooooo3 = 1;
fooooo4 = 1;
fooooo5 = 1;
fooooo6 = 1;
};
};
}
EOF
# Probable typo in the requested attribute path. Suggest some close possibilities
NIX_BUILD_STDERR_WITH_SUGGESTIONS=$(! nix build .\#fob 2>&1 1>/dev/null)
[[ "$NIX_BUILD_STDERR_WITH_SUGGESTIONS" =~ "Did you mean one of fo1, fo2, foo or fooo?" ]] || \
fail "The nix build stderr should suggest the three closest possiblities"
# None of the possible attributes is close to `bar`, so shouldnt suggest anything
NIX_BUILD_STDERR_WITH_NO_CLOSE_SUGGESTION=$(! nix build .\#bar 2>&1 1>/dev/null)
[[ ! "$NIX_BUILD_STDERR_WITH_NO_CLOSE_SUGGESTION" =~ "Did you mean" ]] || \
fail "The nix build stderr shouldnt suggest anything if theres nothing relevant to suggest"
NIX_EVAL_STDERR_WITH_SUGGESTIONS=$(! nix build --impure --expr '(builtins.getFlake (builtins.toPath ./.)).packages.'$system'.fob' 2>&1 1>/dev/null)
[[ "$NIX_EVAL_STDERR_WITH_SUGGESTIONS" =~ "Did you mean one of fo1, fo2, foo or fooo?" ]] || \
fail "The evaluator should suggest the three closest possiblities"