version-tag.yml

name: Create Version Tag

on:
  push:
    branches: [main]
    paths:
      - "build.zig.zon"

jobs:
  check-version-and-tag:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 2
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Check if version changed
        id: version-check
        run: |
          # Extract current version from build.zig.zon
          CURRENT_VERSION=$(grep -E '^\s*\.version\s*=\s*"[^"]*"' build.zig.zon | sed -E 's/.*"([^"]*)".*$/\1/')
          echo "Current version: $CURRENT_VERSION"

          # Check if this is the first commit or if we can get the previous version
          if git show HEAD~1:build.zig.zon > /dev/null 2>&1; then
            PREVIOUS_VERSION=$(git show HEAD~1:build.zig.zon | grep -E '^\s*\.version\s*=\s*"[^"]*"' | sed -E 's/.*"([^"]*)".*$/\1/')
            echo "Previous version: $PREVIOUS_VERSION"

            if [ "$CURRENT_VERSION" != "$PREVIOUS_VERSION" ]; then
              echo "Version changed from $PREVIOUS_VERSION to $CURRENT_VERSION"
              echo "version-changed=true" >> $GITHUB_OUTPUT
              echo "new-version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
            else
              echo "Version unchanged"
              echo "version-changed=false" >> $GITHUB_OUTPUT
            fi
          else
            echo "First commit or previous version not found, creating tag for current version"
            echo "version-changed=true" >> $GITHUB_OUTPUT
            echo "new-version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
          fi

      - name: Update README.md with new version
        if: steps.version-check.outputs.version-changed == 'true'
        run: |
          VERSION="${{ steps.version-check.outputs.new-version }}"

          # Update the zig fetch command in README.md
          sed -i "s|zig fetch --save \"git+https://github.com/xarunoba/env-struct.zig#v[^\"]*\"|zig fetch --save \"git+https://github.com/xarunoba/env-struct.zig#v${VERSION}\"|g" README.md

          # Check if README.md was actually modified
          if git diff --quiet README.md; then
            echo "No changes needed in README.md"
          else
            echo "Updated README.md with version v${VERSION}"

            # Commit and push the README update
            git config --local user.email "action@github.com"
            git config --local user.name "GitHub Action"
            git add README.md
            git commit -m "Update README.md with version v${VERSION}"
            git push
          fi

      - name: Create or update tag
        if: steps.version-check.outputs.version-changed == 'true'
        run: |
          VERSION="${{ steps.version-check.outputs.new-version }}"

          # Check if tag already exists
          if git tag | grep -q "^v${VERSION}$"; then
            echo "Tag v${VERSION} already exists, deleting and recreating..."
            # Delete the tag locally and remotely
            git tag -d "v${VERSION}" || true
            git push --delete origin "v${VERSION}" || true
          else
            echo "Creating new tag v${VERSION}"
          fi

          # Create and push the tag
          git tag -a "v${VERSION}" -m "${VERSION} Release"
          git push origin "v${VERSION}"

          echo "Successfully created/updated and pushed tag v${VERSION}"