✨ feat(mq-run): add --diff to -U for safe change preview - #2164
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Preview what `-U` would change without writing anything: prints a unified diff of the original input against the transformed output instead of the full content. Multiple files are diffed one at a time with their path in the headers; stdin is labeled `<stdin>`. Exits 1 if anything would change, 0 otherwise, so it can gate CI/scripts. Requires --update via clap's `requires`, and is rejected with -F grep. Diffing always compares against plain (uncolored) text even with -C, to avoid ANSI codes baking into the rendered content and making every line look changed; the diff output colors its own +/-/@@ lines.
Hooray! CodSpeed harness just leveled up!The base and head of this comparison were measured with different runner settings, so their benchmark values are not directly comparable. What changed between base and head:
Re-run the base with the same settings to get a valid performance comparison. Comparing 
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Summary
Preview what
-Uwould change without writing anything: prints a unified diff of the original input against the transformed output instead of the full content. Multiple files are diffed one at a time with their path in the headers; stdin is labeled<stdin>. Exits 1 if anything would change, 0 otherwise, so it can gate CI/scripts.Requires --update via clap's
requires, and is rejected with -F grep. Diffing always compares against plain (uncolored) text even with -C, to avoid ANSI codes baking into the rendered content and making every line look changed; the diff output colors its own +/-/@@ lines.Type of Change
Checklist
cargo fmtandcargo clippyand addressed any warningsjust test-alland all tests pass/docs, crateREADME.md) if neededAdditional Context