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Setting Up Pre-Commit for Python Code Formatting

This guide will walk you through setting up a pre-commit hook for automatically formatting all Python files within the geest directory using black.

Prerequisites

  • Python 3.x: Ensure you have Python 3 installed on your machine.
  • pip: Python's package installer.

Step 1: Install pre-commit

First, you'll need to install the pre-commit package. You can do this using pip:

pip install pre-commit

Step 2: Create .pre-commit-config.yaml

In the root of your repository, create a file named .pre-commit-config.yaml. Add the following configuration to set up black as the pre-commit hook for Python code formatting:

# .pre-commit-config.yaml
repos:
  - repo: https://github.com/psf/black
    rev: 24.4.0  # Replace with the version of black you are using
    hooks:
      - id: black
        name: black
        language_version: python3
        # Restrict black to only the `geest` directory
        additional_dependencies: []
        args: [geest]
  • repos: Defines the hooks to use. Here, we use the black formatter from its GitHub repository.
  • rev: Specifies the version of black. Make sure to replace it with the version you are using.
  • args: Restricts black to format only the Python files within the geest directory.

Step 3: Install the Pre-Commit Hook

Navigate to the root of your repository (where the .pre-commit-config.yaml file is located) and install the hook using:

pre-commit install

This command sets up the pre-commit hook so that it will run automatically every time you make a commit.

Step 4: Run the Hook Manually (Optional)

You can test the hook manually to ensure it works as expected before committing any changes:

pre-commit run --all-files

This will apply black formatting to all Python files in the geest directory.

Step 5: Commit Your Changes

Once the hook is installed, every time you make a commit, the black formatter will automatically format your Python code within the geest directory. If any changes are made by black, the commit will fail, allowing you to review the changes before committing again.

Troubleshooting

If you encounter any issues:

  1. Make sure pre-commit is installed correctly.
  2. Ensure your .pre-commit-config.yaml file is correctly configured and located in the root of your repository.
  3. Check that you have the correct version of black.

Additional Resources

After following this guide, you will have a working pre-commit hook that formats all Python files in the geest directory using black before every commit.

Enjoy coding with consistent formatting! 🚀