check_package_version.yml

name: Compare the package version of the PR with the main branch

# The workflow gets triggered by pushes and pull requests
on:
  pull_request:
    branches: [ "main" ]

jobs:
  compare-versions:

    runs-on: ubuntu-latest
    strategy:
      fail-fast: false

    steps:
    # Checks out the code in the repository
    - uses: actions/checkout@v3
    - name: Compile CLUEstering modules
      working-directory: ${{github.workspace}}
      run: |
        git fetch
        RED="\033[0;31m"

        pr_version=$(cat setup.py | grep "__version__ " | awk -F '"' '{print $2}')
        pr_major=$(echo "$pr_version" | awk -F '.' '{print $1}')
        pr_minor=$(echo "$pr_version" | awk -F '.' '{print $2}')
        pr_patch=$(echo "$pr_version" | awk -F '.' '{print $3}')

        echo "Switching to 'main' branch"
        git switch main
        main_version=$(cat setup.py | grep "__version__ " | awk -F '"' '{print $2}')
        main_major=$(echo "$main_version" | awk -F '.' '{print $1}')
        main_minor=$(echo "$main_version" | awk -F '.' '{print $2}')
        main_patch=$(echo "$main_version" | awk -F '.' '{print $3}')

        if [ "$main_major" -le "$pr_major" ]; then
          if [ "$main_minor" -le "$pr_minor" ]; then
            if [ "$main_patch" -lt "$pr_patch" ] ||
               [ "$main_major" -lt "$pr_major" ] ||
               [  "$main_minor" -lt "$pr_minor" ]; then
              exit 0  # at least one version counters has been updated
            else
              echo -e "${RED}ERROR: Patch version is behind main. Update the version in setup.py"
              echo -e "${RED}main -> $main_version"
              echo -e "${RED}pr -> $pr_version"
              exit 1
            fi
          else
            echo -e "${RED}ERROR: Minor version is behind main. Update the version in setup.py"
            echo -e "${RED}main -> $main_version"
            echo -e "${RED}pr -> $pr_version"
            exit 1
          fi
        else
            echo -e "${RED}ERROR: Major version is behind main. Update the version in setup.py"
            echo -e "${RED}main -> $main_version"
            echo -e "${RED}pr -> $pr_version"
            exit 1
        fi