tag.yml

name: Tag

on:
  push:
    branches:
      - main
  
permissions:
  contents: write
  
jobs:
  tag:
    runs-on: ubuntu-latest
  
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          fetch-depth: 0
          sparse-checkout: package.json
  
      - name: Check version
        id: version
        run: |
          set -e -o pipefail
          BEFORE_VERSION=$(git show "${{ github.event.before }}:package.json" | jq -r .version)
          AFTER_VERSION=$(git show "${{ github.event.after }}:package.json" | jq -r .version)
      
          if [ "$BEFORE_VERSION" != "$AFTER_VERSION" ]; then
            echo "Version changed from $BEFORE_VERSION to $AFTER_VERSION"
            echo "version=$AFTER_VERSION" >> "$GITHUB_OUTPUT"
          fi
  
      - name: Tag version
        if: ${{ steps.version.outputs.version }}
        run: |
          set -e -o pipefail
          git tag "${{ steps.version.outputs.version }}" "${{ github.event.after }}"
          git push origin "${{ steps.version.outputs.version }}"