Introduction to click-didyoumean

click-didyoumean is a powerful extension for the popular Python library Click. It enhances the user experience by providing intelligent suggestions when users mistype commands. This can significantly reduce frustration and improve usability for command-line interfaces (CLIs).

Key Features and APIs

Installation

To get started with click-didyoumean, you first need to install it:

 pip install click-didyoumean 

Usage

To utilize click-didyoumean in your Click application, you need to “patch” your CLI group with it. This is done by importing the extension and calling the patch method.

  import click from click_didyoumean import patch
patch(click.Group)  

Example Application with click-didyoumean

Below is an example of a Click application that has been enhanced with click-didyoumean. This small application has several commands, including a typo-prone command to showcase the use of the suggestion feature.

  import click from click_didyoumean import patch
patch(click.Group)
@click.group() def cli():
    pass

@cli.command() def greet():
    click.echo("Hello, world!")

@cli.command() def farewell():
    click.echo("Goodbye, world!")

if __name__ == "__main__":
    cli()
 

In this example, if a user mistypes a command, such as writing gree instead of greet, click-didyoumean will suggest the closest match:

  $ python yourscript.py gree Error: No such command "gree". Did you mean "greet"?  

Advanced Topics

click-didyoumean supports customization for its suggestions. Here are a few advanced examples:

Customizing Suggestions

  import click from click_didyoumean import patch
patch(click.Group, choice_order=lambda ctx, cmd: cmd != 'greet')
@click.group() def cli():
    pass

@cli.command() def greet():
    click.echo("Hello, world!")

@cli.command() def farewell():
    click.echo("Goodbye, world!")

if __name__ == "__main__":
    cli()
 

This configuration customizes the order in which suggestions are shown, placing the greet command last.

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Conclusion

By integrating click-didyoumean into your Click-based CLI applications, you can significantly enhance user experience by reducing frustration due to typos. This feature makes your application more user-friendly and intuitive, leading to broader adoption and better reviews.

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