Saving a specific message-format to a file, while also producing "normal" output

[BatmanAoD]

Problem

In CI, it can be useful to generate a code-quality report while also printing a job log designed for humans to read. cargo check provides --message-format json, which enables generating machine-readable output that can be used to generate a report programmatically (e.g. with https://crates.io/crates/gitlab_clippy); but currently, there's no way to do this in such a way that cargo also produces useful human-readable output. cargo clippy --message-format json | tee <file> is too verbose and difficult to read.

Because of this, gitlab_clippy recommends running cargo check twice in CI, once to produce readable output and fail the job if there are errors, and again to produce a report.

Proposed Solution

There could be an additional flag that would take a file argument and permit sending json messages to that file, while emitting the "normal" Cargo output on stdout.

Notes

No response

[epage]

https://crates.io/crates/gitlab_clippy);

Another similar conversion command: https://crates.io/crates/clippy-sarif

[ehuss]

Thanks for the report! The cargo team discussed this and decided to close this for now. We suggest that, if possible, gitlab_clippy be responsible for printing the rendered output from the JSON messages. If there are events or other things missing from the JSON that would be useful, feel free to open a new issue for any missing messages (though I think we have a few currently open).