Detect new versions of Python packages in GHA

gha-detect-new-version.yml

name: Check Version Change and Tag

on: [push]

jobs:
  tag-version:
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2
      with:
        fetch-depth: 0  # Fetches all history for branches and tags

    - name: Set up Python
      uses: actions/setup-python@v2
      with:
        python-version: '3.x'

    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install toml

    - name: Check version change and tag
      run: |
        import toml
        import subprocess

        def run_cmd(cmd):
            return subprocess.run(cmd, check=True, shell=True, capture_output=True, text=True).stdout.strip()

        def read_version_from_commit(commit_hash):
            pyproject_content = run_cmd(f"git show {commit_hash}:pyproject.toml")
            return toml.loads(pyproject_content)['tool']['poetry']['version']

        old_commit = '${{ github.event.before }}'
        new_commit = '${{ github.event.after }}'

        old_version = read_version_from_commit(old_commit)
        new_version = read_version_from_commit(new_commit)

        if old_version != new_version:
            print(f"Version changed from {old_version} to {new_version}")
            tag_name = f"v{new_version}"
            tag_message = f"Release {tag_name}"
            run_cmd(f"git config user.name 'github-actions'")
            run_cmd(f"git config user.email 'github-actions@github.com'")
            run_cmd(f"git tag -a {tag_name} -m '{tag_message}'")
            run_cmd(f"git push origin {tag_name}")
        else:
            print("Version did not change.")

      shell: python