🍥️ dony

A lightweight Python command runner with shell execution and user interactions.

Commands are just Python functions. You run them by running Python files directly (python deploy.py).

Installation

pip install dony

Optional dependencies:

brew install fzf     # For fuzzy selection
brew install shfmt   # For shell command formatting

Example

import asyncio
import dony

@dony.command()
async def deploy():
    """Deploy application"""

    if not await dony.confirm("Deploy to production?"):
        return

    env = await dony.select("Select environment:", ["staging", "production"])

    await dony.shell(f"""
        npm run build
        npm test
        ./deploy.sh {env}
    """)

    await dony.success(f"Deployed to {env}")

if __name__ == "__main__":
    asyncio.run(deploy())

Run with python deploy.py

CLI Support

For CLI support, use fire or any other CLI framework:

import asyncio
import dony
import fire

@dony.command()
async def build(env: str = None):
    """Build application"""

    env = env or await dony.select("Select environment:", ["staging", "production"])

    await dony.shell(f"""
        npm run build --env={env}
        npm test
    """)

    await dony.success(f"Built for {env}")

if __name__ == "__main__":
    fire.Fire(build)

Run interactively: python build.py Run with CLI args: python build.py --env=production

Recipes

Working from git repo root

import asyncio
from functools import partial
import dony

async def main():
    shell = partial(dony.shell, run_from=dony.find_repo_root(__file__))

    await shell("npm run build")
    await shell("npm test")

if __name__ == "__main__":
    asyncio.run(main())

Things to know

• @dony.command(): marker decorator for commands (currently a no-op)
• Available prompts based on questionary:
  • dony.input(): free-text entry
  • dony.confirm(): yes/no ([Y/n] or [y/N])
  • dony.select(): option picker (supports fuzzy)
  • dony.select_many(): multiple option picker (supports fuzzy)
  • dony.press_any_key(): pause until keypress
  • dony.echo(): styled text output
  • dony.error(): ✕ error message
  • dony.success(): ✓ success message

API Reference

async def dony.shell(
    command: str,
    run_from: Optional[Union[str, Path]] = None,   # Working directory
    dry_run: bool = False,                         # Print without executing
    quiet: bool = False,                           # Suppress printing output
    capture_output: bool = True,                   # Return output as string
    abort_on_failure: bool = True,                 # Prepends 'set -e'
    abort_on_unset_variable: bool = True,          # Prepends 'set -u'
    trace_execution: bool = False,                 # Prepends 'set -x'
    show_command: bool = True,                     # Print formatted command
    confirm: bool = False,                         # Ask before executing
) -> str:
    ...

def dony.find_repo_root(path: Union[str, Path]) -> Path:
    """Find the git root directory starting from the given path."""
    ...

License

MIT License

Author

Mark Lidenberg marklidenberg@gmail.com