#moondiff

Difftool that aware MoonBit language syntax.

Inspired by difftastic

Try it in playground: https://moonbit-community.github.io/moondiff/

#CLI

moondiff [--ignore-comments] [--ignore-tests] old-file new-file

--ignore-tests is off by default and applies only when both paths end in .mbt. After both MoonBit inputs parse successfully, top-level test and async test blocks are removed from lexical and AST comparison, together with their leading documentation comments, ///|UUID(...) markers, and ///| separators. Test-only changes report no changes; when production code also changes, only that production change is highlighted. Imports such as import { ... } for "test" remain ordinary source and are still compared.

--ignore-comments independently excludes comments and blank-line-only changes. The flags can be combined. If either MoonBit input fails to parse, the CLI retains its existing whole-file lexical fallback; --ignore-tests is not guaranteed to filter that fallback. Non-.mbt inputs always use the plain line diff and are unaffected by either MoonBit filter.

For reliably aligned MoonBit declarations, each CLI section title ends with the trimmed source line containing that declaration's keyword, and every visible @@ ... @@ hunk heading repeats the same context. Matching old/new lines are shown once; changed declaration lines are rendered as old: … → new: …. Leading documentation, UUID markers, separators, and standalone attribute lines are not used as the context. Whole-file results, including parse-failure fallbacks, and ordinary text diffs do not attach a top-level declaration context.

#install (unfinish)

#Use Moondiff in Git Repository (unfinish)

configure git to use the installed wasm as an optional diff tool within that repository:

git config diff.tool moondiff
git config difftool.moondiff.cmd 'bash "$HOME/.local/share/moondiff/moondiff_git_wrapper.sh" "$LOCAL" "$REMOTE" "$MERGED"'
git config difftool.prompt false

usage:

git difftool <commit>^ <commit> # view diff for a specific commit
git difftool <edited file>

Source Files

main.mbt

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