Lightweight changelog renderer for CI pipelines — works with commitizen's output

[ajarcoronet5415-commits]

Hey commitizen community 👋

If you're using commitizen to enforce conventional commits, you already have machine-readable commit history. I've been working on a tiny companion tool that takes those commits and renders changelogs in markdown, JSON, or HTML — with zero external dependencies.

Why this exists:
Most changelog generators pull in heavy dependency trees (npm, Rust toolchain, Ruby gems). For Python projects in CI, that's overkill. This is a single .py file — copy it into your repo or run it from a URL directly.

python changelog.py --since v1.0.0 --format markdown --output CHANGELOG.md

What it does:

• Parses conventional commits (feat:, fix:, docs:, etc.) with optional scope
• Three output formats: markdown (emoji-labeled), JSON (for API consumption), HTML (for GitHub Pages)
• Works with any git log — no CI platform lock-in
• Single file, ~100 lines, zero pip installs, zero npm, zero Rust

How it fits with commitizen:

• commitizen handles the before (enforcing + creating commits)
• changelog.py handles the after (rendering release notes)
• They don't overlap — they're complementary layers in a release pipeline

Links:
Full details & download: https://changelogshop.sell.app

Happy to hear feedback or feature requests. The goal is to keep it minimal — if you need something more complex, git-cliff or semantic-release are great options. But for a lightweight Python CI step, this does the job.