Vommit

Vommit Oversees Making & Managing Installable Things

Vommit automates version bumps, changelogs, Git releases, builds, and publishing for uv-based Python packages using Conventional Commits.

Vommit requires Python 3.13 or newer, uv 0.7 or newer, and a static [project].version in pyproject.toml. Automatic version selection and the default release workflow also expect a Git repository, but this can be disabled via config.

Getting started

Install Vommit into the active environment:

uv pip install vommit

For a global installation, you can use something like uvenv, pipx, or uv tool:

uvenv install vommit
# or: pipx install vommit / uv tool install vommit

From a Python project directory, create or complete the Vommit configuration interactively:

vommit setup

To see all commands and options:

vommit --help

Starting a new project

vommit init --project-name mypkg

Runs uv init --package, configures Vommit in the result, and leaves a project that is ready to release, with a named branch, declared license, changelog, and initial commit.

The version starts at 0.0.0, so the first vommit bump derives the first release from its commits: 0.1.0 for a feature or 0.0.1 for a fix.

Each question it asks has a flag that pre-fills it, so --non-interactive takes the answers as given:

vommit init --project-name mypkg --non-interactive \
    --python 3.13 --license MIT --branch main --venv .venv \
    --remote git@example.com:me/mypkg.git --push

The environment is created inside the new project and installed in editable mode. Creating it (and installing) runs last and is never fatal: if it fails, the project is already made, so create it later with uv venv yourself.

Run inside an existing repository, uv init creates no repository of its own. Vommit then leaves that history, branch and remote alone, makes no commit, and writes the .gitignore uv skipped — without it a release would commit its own dist/.

Releasing

vommit release

Vommit bumps the version, runs clean and build, pushes the release commit and tag when Git integration is enabled, then publishes. Nothing is pushed if the build fails; a failed build after a bump can still be taken back with vommit bump --undo.

With Git integration enabled, a release refuses uncommitted changes by default: the build would include them, but the pushed commit would not. Commit or stash your work first, or pass --allow-dirty to publish the working tree as it stands. Build output such as dist/ should be ignored by Git.

If a previous attempt left the version tag on different code from HEAD, Vommit explains the mismatch and asks before publishing.

When no commit warrants a bump, release asks whether to publish the current version; bump simply stops.

For CI, provide UV_PUBLISH_TOKEN and pass --yes. A --noop run does not bump, build, push, publish, or resolve a PyPI credential. It still performs Git preparation checks, which may fetch the remote and, with git.on_wrong_branch = "switch", switch branches.

Commands

[tool.vommit.commands] holds the release commands. clean and build run first; Vommit then pushes the release commit and tag before publish and post_publish run. Leave a command empty to skip it.

[tool.vommit.commands]
clean = "rm -rf ./dist"
build = "uv build"
publish = "uv publish"
post_publish = ""          # runs after the publishing step, even if publish is empty

Environment variables such as $VAR are expanded when the configuration loads.

publish and post_publish run only when pypi.enabled = true.

PyPI credentials

vommit authenticate

Stores a PyPI token in your keyring under vommit/pypi. Vommit checks its format and verifies it against PyPI before storing it. Use --no-verify to skip these checks.

vommit authenticate                   # store or replace a token
vommit authenticate --clear           # remove the stored token, then ask for a new one
vommit authenticate --no-verify       # store without checking the token
vommit ensure-authenticated           # ensure a token is available
vommit ensure-authenticated --show    # show its source and a masked value

When publishing, Vommit looks in three places, in order:

1. UV_PUBLISH_TOKEN in the environment
2. the keyring, when pypi.use_keyring = true
3. an interactive prompt

With keyring use enabled, a token entered at the prompt is stored. Set pypi.use_keyring = false to be asked on every release without storing the answer.

On headless or SSH systems, the default keyring backend may be unavailable. Install vommit[ssh] to add an ssh-agent-backed keyring, or disable keyring use and enter the token for each release.

Bumping versions and changelogs

vommit bump

bump derives the version change from Conventional Commit messages since the last release: breaking changes are major, feat is minor, and fix, perf, and docs are patch by default. A ! in a commit header or a BREAKING CHANGE footer counts as a breaking change; set allow_breaking_bang or allow_breaking_footer to false to ignore either. Use the version-selection, --prerelease, --allow-dirty, --noop, and --yes flags to override or preview the result.

It updates the project version, changelog, and (when Git integration is enabled) creates the configured release commit and tag. vommit bump --undo takes back the latest local bump, but refuses to rewrite a commit or tag that has already been pushed.

Prereleases do not receive separate changelog entries by default; their changes are included when the next stable release is made. Set changelog.include_prereleases = true to list them separately.

Configuration

Run vommit setup to create or complete [tool.vommit] interactively; use vommit setup --mode=all to revisit every setting, or vommit setup --non-interactive for defaults. For a project that does not exist yet, vommit init runs uv init first.

Where the version lives

setup detects a literal version in common package files alongside [project].version and offers to consolidate it, so releases do not leave a second version behind. It offers the same fix for dynamic = ["version"], which must be frozen before Vommit can bump it. Nothing is rewritten without being asked; vommit setup --non-interactive prints the proposed change and stops.

The most useful settings to revisit are:

Migrating from python-semantic-release v7

vommit migrate

Reads [tool.semantic_release] from pyproject.toml, reports mapped, lossy, and unsupported settings, then asks whether to review the result, write it, or stop. Nothing is written before that choice. Use --yes to accept the translation, --on-unsupported=error to refuse unsupported settings, or --on-unsupported=skip for a shorter report.

Unsupported configurations are reported rather than silently discarded. Only pyproject.toml is read; setup.cfg is not supported.

If the project has a dynamic version, Hatchling and setuptools projects can be fixed during migration: the current version is frozen into [project].version, the backend hook is removed, and configured version files are changed to read installed metadata:

from importlib.metadata import version

__version__ = version(__package__)

The migration can then remove [tool.semantic_release] and the python-semantic-release dependency.