How to run a python package on pre-commit git hook?

@thelma.stanton 

To run a Python package on a pre-commit git hook, you can follow these steps:

1. Create a virtual environment (optional): It's recommended to work within a virtual environment to ensure that the dependencies are isolated. You can create a virtual environment using python -m venv myenv and activate it using source myenv/bin/activate (for Linux/Mac) or .myenvScriptsactivate (for Windows).
2. Install the required packages: Install the necessary packages in your virtual environment using pip install mypackage (replace mypackage with the name of your Python package and any other dependencies).
3. Create a pre-commit hook script: In your git repository, create a file named .git/hooks/pre-commit if it doesn't exist already. This file is the script that will run before each commit.
4. Add executable permissions: Make the script executable by running chmod +x .git/hooks/pre-commit in your git repository.
5. Edit the hook script: Open the pre-commit file in a text editor and add the following code:

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#!/bin/bash

# Activate the virtual environment (if applicable)
source path/to/virtual/env/bin/activate

# Run your Python package or command
python -m mypackage.some_module
# Replace 'mypackage.some_module' with the appropriate command or entry point for running your package.

Make sure to replace path/to/virtual/env with the actual path to your virtual environment directory (if you're using one).

1. Save and exit the script.

Now, whenever you run git commit, the pre-commit hook script will be executed, activating the virtual environment (if applicable) and running your Python package or command. If there are any issues or errors during the execution, the commit will be aborted.

Note: Ensure that the virtual environment and dependencies are properly set up and installed. If you need to update or install additional packages before running your package, you can add those pip install commands within the pre-commit hook script.

Remember to test your pre-commit script thoroughly before using it in a production environment.

@thelma.stanton 

For more advanced usage, you can also utilize tools like pre-commit, which is a popular framework for managing and maintaining multi-language pre-commit hooks. Here is an alternative approach using pre-commit:

1. Install pre-commit: You can install pre-commit using pip:

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pip install pre-commit

1. Create a .pre-commit-config.yaml file: In your project directory, create a file named .pre-commit-config.yaml and add a configuration similar to the following:

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repos:
  - repo: https://github.com/pre-commit/mirrors-isort
    rev: v5.9.3
    hooks:
      - id: isort
        args: [--profile, black]

  - repo: https://github.com/pre-commit/mirrors-flake8
    rev: v3.9.1
    hooks:
      - id: flake8

This example sets up hooks for isort (for sorting imports) and flake8 (for linting) using pre-commit's community-maintained hooks.

1. Install the hooks: Run the following command to install the hooks defined in your .pre-commit-config.yaml:

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pre-commit install

This command sets up the pre-commit hooks in your local repository.

1. Trigger the pre-commit checks: Now, every time you run git commit, pre-commit will run the configured hooks before the commit goes through. It will automatically run isort and flake8 on your code.

This approach simplifies setting up and maintaining pre-commit hooks across different projects, making it easier to keep code consistent and error-free.

Remember to adjust the configuration in the .pre-commit-config.yaml file based on your project's specific requirements and add any additional custom hooks as needed.