A CLI framework based on asyncio
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Add support for setup and teardown to CLIs
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README.rst

asynccli

Latest PyPI version Version status Python 3.5 and 3.6 Latest Travis CI build status Codacy grade Codacy coverage

A CLI framework based on asyncio.

Note

This is still in active development. Things will change. For now, the basic framework is operational. If you are interested in helping out, or would like to see any particular features added, let me know.

Usage

The simplest usage is to just pass in an async function.

import asynccli


async def mycli():
    print("Hello, world.")


if __name__ == '__main__':
    app = asynccli.App(mycli)
    app.run()

It can also be instantiated as a class, as long it has a call method.

import asynccli


class DivisionCalculator(asynccli.CLI):
    numerator = asynccli.Integer(help_text='This is the numerator.')
    denominator = asynccli.Integer()

    async def call(self):
        print(self.first_num / self.second_num)


if __name__ == '__main__':
    app = asynccli.App(DivisionCalculator)
    app.run()

In the DivisionCalculator example above, you would call your script like this:

$ /path/to/script.py 2 3
0.6666666666666666

What if you want to have a tiered CLI with a hierarchy of commands? First, create your command by subclassing CLI as above. Then, wrap the whole thing inside of the TieredCLI class, and pass that to the App.

class Calculator(asynccli.TieredCLI):
    d = DivisionCalculator

if __name__ == '__main__':
    app = asynccli.App(Calculator)
    app.run()

Now, to invoke the script, you have an extra argument to call:

$ /path/to/script.py d 2 3
0.6666666666666666

Installation

pip install asynccli

Requirements

Currently it requires Python 3.5 to make use of async/await. It uses argparse under the hood, and therefore has no dependencies outside of the standard library.

Roadmap

  • Additional Argument types
  • Integration of additional argparse features
  • Add uvloop
  • Better support for help documentation

Testing

You can invoke the test scripts a few different ways:

$ py.test
$ python setup.py test
$ python -m py.test

And, in order to generate the test coverage:

$ coverage run -m py.test

License

MIT

Authors

asynccli was written by Adam Hopkins.