A CLI tool to build beautiful command-line interfaces with type validation.

Related tags

CLI Interface Development python cli
Overview

Piou

Python versions Latest PyPI version CircleCI Latest conda-forge version

A CLI tool to build beautiful command-line interfaces with type validation.

It is as simple as

from piou import Cli, Option

cli = Cli(description='A CLI tool')


@cli.command(cmd='foo',
             help='Run foo command')
def foo_main(
        foo1: int = Option(..., help='Foo arguments'),
        foo2: str = Option(..., '-f', '--foo2', help='Foo2 arguments'),
        foo3: str = Option(None, '-g', '--foo3', help='Foo3 arguments'),
):
    pass


if __name__ == '__main__':
    cli.run()

The output will look like this:

example

Install

You can install piou with either:

  • pip install piou
  • conda install piou -c conda-forge

Features

Commands

from piou import Cli, Option

cli = Cli(description='A CLI tool')


@cli.command(cmd='foo',
             help='Run foo command')
def foo_main(
        foo1: int = Option(..., help='Foo arguments'),
        foo2: str = Option(..., '-f', '--foo2', help='Foo2 arguments'),
        foo3: str = Option(None, '-g', '--foo3', help='Foo3 arguments'),
):
    pass


@cli.command(cmd='bar',
             help='Run foo command')
def bar_main(
        foo1: int = Option(..., help='Foo arguments'),
        foo2: str = Option(..., '-f', '--foo2', help='Foo2 arguments'),
        foo3: str = Option(None, '-g', '--foo3', help='Foo3 arguments'),
):
    pass


if __name__ == '__main__':
    cli.run()

In this case, foo1 is a positional argument while foo2 and foo3 are keyword arguments.

You can optionally specify global options that will be passed to all commands:

cli = Cli(description='A CLI tool')

cli.add_option('-q', '--quiet', help='Do not output any message')

The help can also be extracted from the function docstring, both functions here have the same one.

@cli.command(cmd='bar', help='Run foo command')
def bar_main():
    pass


@cli.command(cmd='bar2')
def bar_2_main():
    """
    Run foo command
    """
    pass

Sub-commands

You can group commands into sub-commands:

from piou import Cli, Option

cli = Cli(description='A CLI tool')

sub_cmd = cli.add_sub_parser(cmd='sub', description='A sub command')

sub_cmd.add_option('--dry-run', help='Run in dry run mode')


@sub_cmd.command(cmd='foo', help='Run baz command')
def baz_bar_main(**kwargs):
    pass


@sub_cmd.command(cmd='bar', help='Run toto command')
def toto_main(
        foo1: int = Option(..., help='Foo arguments'),
        foo2: str = Option(..., '-f', '--foo2', help='Foo2 arguments'),
):
    pass


if __name__ == '__main__':
    cli.run()

example

Options processor

Sometimes, you want to run a function using the global arguments before running the actual command (for instance initialize a logger based on the verbose level).

To do so, you use set_options_processor that will receive all the current global options of the CLI.

from piou import Cli

cli = Cli(description='A CLI tool')

cli.add_option('--verbose', help='Increase verbosity')


def processor(verbose: bool):
    print(f'Processing {verbose=}')


cli.set_options_processor(processor)

Complete example

Here is a more complete example that you can try by running python -m piou.test

from piou import Cli, Option

cli = Cli(description='A CLI tool')

cli.add_option('-q', '--quiet', help='Do not output any message')
cli.add_option('--verbose', help='Increase verbosity')


@cli.command(cmd='foo',
             help='Run foo command')
def foo_main(
        quiet: bool,
        verbose: bool,
        foo1: int = Option(..., help='Foo arguments'),
        foo2: str = Option(..., '-f', '--foo2', help='Foo2 arguments'),
        foo3: str = Option(None, '-g', '--foo3', help='Foo3 arguments'),
):
    pass


@cli.command(cmd='bar', help='Run bar command')
def bar_main(**kwargs):
    pass


sub_cmd = cli.add_sub_parser(cmd='sub', description='A sub command')
sub_cmd.add_option('--test', help='Test mode')


@sub_cmd.command(cmd='bar', help='Run baz command')
def baz_bar_main(
        **kwargs
):
    pass


@sub_cmd.command(cmd='toto', help='Run toto command')
def toto_main(
        test: bool,
        quiet: bool,
        verbose: bool,
        foo1: int = Option(..., help='Foo arguments'),
        foo2: str = Option(..., '-f', '--foo2', help='Foo2 arguments'),
):
    pass


if __name__ == '__main__':
    cli.run()
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Comments
  • validate_type -> convert_to_type

    validate_type -> convert_to_type

    Hi!

    I suggest renaming the function. It converts to the given type. In "validate" I would expect either boolean result or no result / exception.

    https://github.com/Andarius/piou/blob/fedc4514c0c74059bb5a5dcf69bb275448999726/piou/utils.py#L16

    enhancement 
    opened by ilyash 2
Releases(0.13.1)
Owner
Julien Brayere
Julien Brayere
GitHub https://pypi.org/project/piou/
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