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toJSON: report error position for fancier output

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Given flake:

```nix
{ description = "nix json error provenance";
  inputs = {};
  outputs = { self }: {
    jsonFunction = _: "function";
    json = builtins.toJSON (_: "function");
  };
}

```
- Before:

```console
❯ nix eval --json .#jsonFunction
error: cannot convert a function to JSON
```

- After:

```console
❯ nix eval --json .#jsonFunction
error: cannot convert a function to JSON

       at /nix/store/b7imf1c2j4jnkg3ys7fsfbj02s5j0i4f-source/testflake/flake.nix:4:5:

            3|   outputs = { self }: {
            4|     jsonFunction = _: "function";
             |     ^
            5|     json = builtins.toJSON (_: "function");
```
This commit is contained in:
Shay Bergmann 2021-10-25 21:13:35 +00:00
parent 4a2b7cc68c
commit ba81e871b2
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GPG key ID: 4D33B73FFDB9217C
6 changed files with 22 additions and 16 deletions
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2
src/nix-instantiate/nix-instantiate.cc
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@ -52,7 +52,7 @@ void processExpr(EvalState & state, const Strings & attrPaths,
if (output == okXML)
printValueAsXML(state, strict, location, vRes, std::cout, context);
else if (output == okJSON)
printValueAsJSON(state, strict, vRes, std::cout, context);
printValueAsJSON(state, strict, vRes, noPos, std::cout, context);
else {
if (strict) state.forceValueDeep(vRes);
std::cout << vRes << std::endl;