Feature request: exclude/ignore files from the diff (e.g. generated files)

[turygo]

Hi, thanks for lumen — it's become my go-to diff viewer!

One small thing that would make it even better: a way to exclude certain files from the diff. Things like lock files and auto-generated code (*.lock, dist/**, generated protobuf/codegen output, etc.) tend to produce huge, noisy diffs that I almost never want to review, and right now there's no way to hide them.

From what I can see, --file is an exact-match allowlist only, so manually listing everything I do want isn't practical when there are many files.

Would it be possible to add an --exclude flag (ideally with glob support, and maybe a matching exclude field in lumen.config.json)? That would let me set it once per project and keep generated files out of the way.

Thanks for considering it!

[gmist]

Why not use .gitignore? If you don’t need build artifacts, lock files, etc., just add them to .gitignore to exclude them from version control.

[turygo]

Thanks for the suggestion! The thing is, in my case these files do need to be tracked in git — they're auto-generated code and data files (model files, JSON, etc.) that are committed as part of the repo, so I can't just .gitignore them.

A couple of concrete examples from my workflow:

• Go: protobuf output (*.pb.go), generated mocks (*_mock.go), wire_gen.go, and other go generate results. These are usually committed so teammates/CI don't have to re-run codegen.
• Flutter/Dart: *.g.dart (json_serializable / built_value), *.freezed.dart, *.gr.dart (auto_route), etc. — same story, they're checked in alongside the source.

These all need to stay in version control, but they create huge, noisy diffs that I almost never want to read during review. So what I'm after is purely a review-time filter: keep the files tracked as usual, just hide them from the diff view. .gitignore can't separate those two concerns, which is why an --exclude glob (or a config field) would be really handy.