re0-git

Rewrite a finished commit message so the log hands off on its own — in the author's own voice, not an imposed one.

Goal

Repeated amends and momentum commits leave a message bloated, stale, or padded with trivia. re0-git rewrites the message into a clean version that lets a fresh session continue from git log alone, without reading the diff. It refines what the author already writes. Only the message moves — and timestamps, per the date rule below; the tree never changes.

It is user-invoked — run it once you've decided to commit. A commit-cleanup tool in the agent's reach would bias it toward committing when it shouldn't.

Workflow

1. Scope the target — usually HEAD, sometimes a short unpushed range.
2. Read the change (git show --stat, git diff) and any documented commit rules. Then sample nearby non-target messages: start with 10, stop earlier if the convention is obvious, or expand only until the convention is clear.
3. Resolve mixed logs in this order: documented project rules, nearby commits touching the same area, then same-author commits within that convention. Do not average incompatible styles or let one author's habits override the repo.
4. Rewrite the message to the commit-economy (below): keep only durable handoff facts, fold supporting edits into the change they serve, and cut anything the diff or tag already proves. Give trivia no bullet of its own.
5. Re-commit signed, dates per the rule below. For the tip (HEAD): git commit --amend -S --date=now — the --date=now is what moves the author date to now; a bare --amend resets only the committer date and leaves the author date stale. For an older commit, keeping its dates: rebuild it — GIT_AUTHOR_DATE/GIT_COMMITTER_DATE git commit-tree <tree> -p <parent> -S -m "<new message>" — then replay every descendant onto the rebuilt commit (a non-tip rewrite is a rebase, not a ref move), or you orphan them.
6. Verify and report.

Rules