Cloup — originally from “Click + option groups” — enriches Click with several features that make it more expressive and configurable:
option groups and an (optional) help section for positional arguments
mutually_exclusive, that can be applied to option groups or to any group of parameters, even conditionally
subcommands sections, i.e. the possibility of organizing the subcommands of a
Groupin 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 <subcommand>?” when you mistype a subcommand.
Moreover, Cloup improves on IDE support providing decorators with detailed
type hints and adding the static methods
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¶
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')
If you don’t provide
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).
Supporting the project¶
Designing, testing and documenting a library takes a lot of time. The most concrete way to show your appreciation and to support future development is by donating. Any amount is appreciated.
Apart from that, you can help the project by starring it on GitHub, reporting issues, proposing improvements and contributing with your code!
Please, note that Cloup documentation doesn’t replace Click documentation.
- Arguments with
- Option groups
- Subcommand aliases
- Subcommand sections
- Help formatting and themes