diffsitter

diffsitter is a local semantic diff CLI that parses source files with tree-sitter and compares syntax trees instead of raw lines. It is aimed at code review and edit inspection where formatting noise would otherwise dominate a normal diff.

• Compare two source files and surface structural code changes while ignoring whitespace-only or formatting-only churn.
• Force a language, adjust node filtering and whitespace handling, and tune file associations so diffs follow the syntax that matters for a project.
• Emit diff data as JSON or terminal output, then plug it into review scripts, git difftool flows, or post-edit verification steps.

• The interface is non-interactive by default: two file paths in, exit status and diff output out, with --renderer json available for follow-up parsing.
• It fits local inspect loops well when an agent needs to compare generated code or review a patch semantically before handing results to a human.
• Scope is narrower than tools like git or ast-grep: it only compares files, depends on supported tree-sitter grammars, and does not mutate repositories or services.

• The README explicitly says the project is still a work in progress and not yet production ready.
• Unsupported file types require a configured fallback diff command, and language support is bounded by bundled or loadable tree-sitter grammars.