footman
A task runner with the soul of duty and the UX of typer: typed function signatures become real flags and positionals, modules become nested command groups, independent tasks run in parallel by default, and shell completion answers from a cached manifest in ~25 ms — without importing your code.
Ships two console scripts, footman and the two-letter fm. Zero runtime
dependencies. Python 3.11+.
[!NOTE] Beta. footman is pre-1.0: the surface is settling, but minor versions may still include breaking changes — always called out in the changelog, never in a patch release. Pin the minor (
footman~=0.20.0) if you build on it. The written stability promise lands with 1.0 — the road there is in ROADMAP.md.
Why
duty gets a lot right — the run() capture model, the decorator
ergonomics — and footman keeps those ideas. Where it pushes is the parts
that compound: completion served from a cache instead of re-importing your
project on every TAB (~15× faster, measured), eager type and choice
validation with errors that teach, a DAG scheduler that runs independent
tasks concurrently (the same four-step check lands ~4× sooner than duty
or invoke, measured) with true fail-fast that kills in-flight work on the
first failure, runnable command groups and parameter forwarding that make
composite commands like fm lint and check first-class, a monorepo task
cascade that merges a tasks.py per folder, and a first-party story for
testing your tasks. The receipts live
in the comparison —
every number reproducible from comparison/.
Taste
uv add --dev footman # or: pip install footman
# tasks.py
from footman import task, group, run
from footman.tools import pytest, ruff
@task
def lint(fix: bool = False):
"Run ruff over the project."
ruff.check("src", fix=fix)
@task(pre=[lint])
def test(*pytest_args):
"Run the test suite (extra args after --)."
pytest(*pytest_args)
docs = group("docs", help="Documentation")
@docs.task(infinite=True)
def serve(port: int = 8000):
"Serve the docs locally."
run(f"mkdocs serve -a localhost:{port}")
$ fm lint --fix
$ fm lint test docs.serve --port 8001 # one chain; independent tasks run in parallel
$ fm test -- -k grammar -x # everything after -- goes to pytest
$ fm deploy produ
fm: deploy: <target> must be one of dev|staging|prod (got 'produ') — did you mean 'prod'?
$ fm --install-completion # detects your shell; TAB answers in ~25 ms
Learn more
Documentation — start with Getting started, then the good parts: typed signatures · chaining & parallelism · monorepos · composing tasks · running tools · testing your tasks · completion · CI & automation · comparison with duty / invoke / poe / typer
MIT licensed. The road to 1.0 lives in ROADMAP.md.
1 maintainer
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