check_version.yml

name: Check Version

on:
  workflow_call:
    inputs:
      file_path:
        description: File path to check for version change
        required: true
        type: string
    outputs:
      version_changed:
        description: true if the version line in the file has changed
        value: ${{ jobs.check.outputs.version_changed }}
      only_patch_version_changed:
        description: true if only the patch version has changed
        value: ${{ jobs.check.outputs.only_patch_version_changed }}

jobs:
  check:
    runs-on: ubuntu-latest
    outputs:
      version_changed: ${{ steps.check.outputs.version_changed }}
      only_patch_version_changed: ${{ steps.check.outputs.only_patch_version_changed }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2
          submodules: recursive
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Check for version changes
        id: check
        run: |
          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
            # For PRs, compare PR head against base branch
            OLD_VERSION=$(git show ${{ github.event.pull_request.base.sha }}:${{ inputs.file_path }} | grep '^version = ' | cut -d '"' -f 2)
          else
            # For direct pushes, compare the last two commits
            OLD_VERSION=$(git show HEAD~1:${{ inputs.file_path }} | grep '^version = ' | cut -d '"' -f 2)
          fi

          # `cut` grabs everything inside the ", i.e. the version number x.y.z
          NEW_VERSION=$(grep '^version = ' ${{ inputs.file_path }} | cut -d '"' -f 2)

          echo "OLD_VERSION=$OLD_VERSION"
          echo "NEW_VERSION=$NEW_VERSION"

          if [ "$OLD_VERSION" != "$NEW_VERSION" ]; then
            echo "Version has changed."
            echo "version_changed=true" >> $GITHUB_OUTPUT
            IFS='.' read -ra OLD_PARTS <<< "$OLD_VERSION"
            IFS='.' read -ra NEW_PARTS <<< "$NEW_VERSION"

            if [ "${OLD_PARTS[0]}" == "${NEW_PARTS[0]}" ] && [ "${OLD_PARTS[1]}" == "${NEW_PARTS[1]}" ]; then
              echo "Only the patch version has changed."
              echo "only_patch_version_changed=true" >> $GITHUB_OUTPUT
            else
              echo "Major or minor version has changed."
              echo "only_patch_version_changed=false" >> $GITHUB_OUTPUT
            fi
          else
            echo "No version change detected."
            echo "version_changed=false" >> $GITHUB_OUTPUT
            echo "only_patch_version_changed=false" >> $GITHUB_OUTPUT
          fi