fpm-version-update.yml

name: Auto-update fpm Formula

on:
  workflow_dispatch: # Allows manual trigger

jobs:
  update-fpm:
    runs-on: ubuntu-latest
    permissions:
      actions: write
      contents: write
      pull-requests: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Fetch latest fpm release
        id: get-latest-release
        run: |
          VERSION_WITH_V="$(curl -s https://api.github.com/repos/fortran-lang/fpm/releases/latest | jq -r '.tag_name')"
          VERSION_WITHOUT_V="${VERSION_WITH_V#v}"  # Remove leading 'v'
          echo "LATEST_VERSION=${VERSION_WITHOUT_V}" >> "$GITHUB_ENV"
          echo "LATEST_VERSION_V=${VERSION_WITH_V}" >> "$GITHUB_ENV"
          echo "Latest version: ${VERSION_WITH_V} (stripped: ${VERSION_WITHOUT_V})"

      - name: Extract current formula version
        id: get-current-version
        run: |
          CURRENT_VERSION="$(grep -oP 'url "https://github.com/fortran-lang/fpm/releases/download/v\K[0-9.]+' Formula/fpm.rb | head -n 1)"
          echo "CURRENT_VERSION=${CURRENT_VERSION}" >> "$GITHUB_ENV"
          echo "Current version: ${CURRENT_VERSION}"

      - name: Compare versions
        id: check-update
        run: |
          if [ "${{ env.LATEST_VERSION }}" != "${{ env.CURRENT_VERSION }}" ] || [ "${{ github.event_name }}" == "workflow_dispatch" ]; then
            echo "New version available or manually triggered!"
            echo "UPDATE_NEEDED=true" >> "$GITHUB_ENV"
          else
            echo "UPDATE_NEEDED=false" >> "$GITHUB_ENV"
            echo "No update needed."
          fi

      - name: Get new SHA256 hash
        if: env.UPDATE_NEEDED == 'true'
        id: get-sha256
        run: |
          SHA_URL="https://github.com/fortran-lang/fpm/releases/download/${{ env.LATEST_VERSION_V }}/fpm-${{ env.LATEST_VERSION }}.zip.sha256"
          SHA256="$(curl -sL "${SHA_URL}" | awk '{print $1}')"
          echo "SHA256=${SHA256}" >> "$GITHUB_ENV"
          echo "New SHA256: ${SHA256}"

      - name: Create branch for update
        if: env.UPDATE_NEEDED == 'true'
        run: |
          BRANCH_NAME="auto-update-fpm-${{ env.LATEST_VERSION }}-$(date +%s)"  # Add timestamp to branch name for uniqueness
          echo "BRANCH_NAME=${BRANCH_NAME}" >> "$GITHUB_ENV"

      - name: Update formula
        if: env.UPDATE_NEEDED == 'true'
        run: |
          RUN_ID="${{ github.run_id }}-${{ github.run_number }}"
          sed -i "1s/^/# Formula last updated on $(date -u +"%Y-%m-%dT%H:%M:%SZ") (Run: ${RUN_ID})\n/" Formula/fpm.rb
          sed -i "s|url \".*\"|url \"https://github.com/fortran-lang/fpm/releases/download/${{ env.LATEST_VERSION_V }}/fpm-${{ env.LATEST_VERSION }}.zip\"|" Formula/fpm.rb
          sed -i "s|sha256 \".*\"|sha256 \"${{ env.SHA256 }}\"|" Formula/fpm.rb
          
      - name: Debug - Show changes
        if: env.UPDATE_NEEDED == 'true'
        run: |
          git diff Formula/fpm.rb || echo "No changes detected in Formula/fpm.rb"

      - name: Create Pull Request
        if: env.UPDATE_NEEDED == 'true'
        id: create-pr
        uses: peter-evans/create-pull-request@v7
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          commit-message: "Update fpm to ${{ env.LATEST_VERSION }} with timestamp"
          title: "Update fpm to ${{ env.LATEST_VERSION }}"
          body: |
            This PR automatically updates the fpm formula to version ${{ env.LATEST_VERSION }}.
            
            **Changes:**
            - Updated URL to ${{ env.LATEST_VERSION_V }} release
            - Updated SHA256 to match the new release
            - Added timestamp to force PR: $(date -u +"%Y-%m-%dT%H:%M:%SZ")
            
            This PR was created automatically by GitHub Actions.
          branch: ${{ env.BRANCH_NAME }}
          base: main
          labels: |
            automated-pr
            version-bump