Click with option groups (documentation)

 Cloup enriches 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 to organize 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 <subcommand>?" 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.
 .
 This package provides the API documentation.