cloup

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======== Overview

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Cloup — originally from "Cl\ick + option gr\ oup\s" — enriches Click <https://github.com/pallets/click>_ with several features that make it more expressive and configurable:

• option groups and an (optional) help section for positional arguments

• constraints, like mutually_exclusive, that can be applied to option groups or to any group of parameters, even conditionally

• subcommand aliases

• subcommands sections, i.e. the possibility of organizing the subcommands of a Group in multiple help sections

• a themeable HelpFormatter that:

  • has more parameters for adjusting widths and spacing, which can be provided at the context and command level
  • use a different layout when the terminal width is below a certain threshold in order to improve readability

• suggestions like "did you mean ?" when you mistype a subcommand.

Moreover, Cloup improves on IDE support providing decorators with detailed type hints and adding the static methods Context.settings() and HelpFormatter.settings() for creating dictionaries of settings.

Cloup is statically type-checked with MyPy in strict mode and extensively tested against multiple versions of Python with nearly 100% coverage.

A simple example

.. code-block:: python

from cloup import (
    HelpFormatter, HelpTheme, Style,
    command, option, option_group
)
from cloup.constraints import RequireAtLeast, mutually_exclusive

# Check the docs for all available arguments of HelpFormatter and HelpTheme.
formatter_settings = HelpFormatter.settings(
    theme=HelpTheme(
        invoked_command=Style(fg='bright_yellow'),
        heading=Style(fg='bright_white', bold=True),
        constraint=Style(fg='magenta'),
        col1=Style(fg='bright_yellow'),
    )
)

# In a multi-command app, you can pass formatter_settings as part
# of your context_settings so that they are propagated to subcommands.
@command(formatter_settings=formatter_settings)
@option_group(
    "Cool options",
    option('--foo', help='This text should describe the option --foo.'),
    option('--bar', help='This text should describe the option --bar.'),
    constraint=mutually_exclusive,
)
@option_group(
    "Other cool options",
    "This is the optional description of this option group.",
    option('--pippo', help='This text should describe the option --pippo.'),
    option('--pluto', help='This text should describe the option --pluto.'),
    constraint=RequireAtLeast(1),
)
def cmd(**kwargs):
    """This is the command description."""
    pass

if __name__ == '__main__':
    cmd(prog_name='invoked-command')

.. image:: https://raw.githubusercontent.com/janLuke/cloup/master/docs/_static/basic-example.png :alt: Basic example --help screenshot

If you don't provide --pippo or --pluto:

.. code-block:: text

Usage: invoked-command [OPTIONS]
Try 'invoked-command --help' for help.

Error: at least 1 of the following parameters must be set:
  --pippo
  --pluto

This simple example just scratches the surface. Read more in the documentation (links below).

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Links

• Documentation (release_ | development_)
• Changelog <https://cloup.readthedocs.io/en/stable/pages/changelog.html>_
• GitHub repository <https://github.com/janLuke/cloup>_
• Q&A and discussions <https://github.com/janLuke/cloup/discussions>_

.. _release: https://cloup.readthedocs.io/en/stable/#user-guide .. _development: https://cloup.readthedocs.io/en/latest/#user-guide