generate-changelog

name	generate-changelog
description	Generate a changelog from conventional commits in this repository. Use when asked to generate, create, or update a changelog, release notes, or summarize changes between versions/tags/refs. Handles both top-level conventional commit prefixes and conventional commits embedded in squash merge commit bodies.

Generate Changelog

Workflow

1. Determine the commit range from user input (two tags, a tag and HEAD, etc.). If not specified, detect the two most recent release tags (matching vX.Y.Z without -preview) via git tag --list 'v*' --sort=-version:refname.
2. Retrieve commits with full bodies:

   git --no-pager log --format="__COMMIT__%H%n%s%n%b__END__" <from>..<to>
   

3. Extract conventional commit entries from each commit using the rules below.
4. Format and output the changelog.

Extracting Conventional Commits

This repo uses squash merges. Conventional commit prefixes may appear in two places:

• Top-level subject line — e.g. feat: add worktree picker (#47)
• Body of a squash merge — individual commits listed as * feat: ... or * fix: ... lines in the commit body. The top-level subject may lack a conventional prefix entirely.

For each commit:

1. If the subject matches <type>: <description>, record it as a single entry with that type.
2. Always scan the body for lines matching * <type>: <description> (where * may also be -). Record each as a separate entry. If the subject already had a conventional prefix, do not double-count entries that duplicate the subject.
3. If neither the subject nor any body line has a conventional prefix, categorize the commit as other.

Recognized types and their changelog categories:

• feat → Features
• fix → Bug Fixes
• docs / doc → Documentation
• chore → Chores
• test → Tests
• refactor → Refactors
• perf → Performance
• ci → CI
• style → Style
• Anything else → Other

Formatting

Output the changelog in Markdown:

## [<version>] - YYYY-MM-DD

### Features
- Description of change (#PR)

### Bug Fixes
- Description of change (#PR)

...

Rules:

• Use the target tag (or "Unreleased" if targeting HEAD) as the version header.
• Get the date from the tagged commit (git log -1 --format=%as <tag>). For HEAD, use today's date.
• Group entries by category. Omit empty categories.
• Order categories: Features, Bug Fixes, Refactors, Performance, Documentation, Tests, CI, Chores, Style, Other.
• Rewrite each entry as a clear, user-friendly description (not a raw commit message). Remove redundant type prefixes.
• Preserve PR references like (#47) at the end of each bullet.
• Do not include merge commits or entries that are purely version bumps (chore: bump package version) unless the user explicitly asks for them.