name: docs

on:
  workflow_dispatch:
  release:
    types: released

jobs:
  docs:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Fetch Repository Reference Info
        id: repo-info
        run: |
          git fetch --prune --unshallow --tags
          RELEASE_TAG=${{ github.event.release.tag_name }}
          LATEST_TAG=$(git tag | grep -E '^[0-9]' | sort -V | tail -1)
          GIT_SHA_SHORT=$(sed 's/\(.\{7\}\).*/\1/' <<< "$GITHUB_SHA")
          PROJECT_NUMBER=${RELEASE_TAG:-${LATEST_TAG:-$GIT_SHA_SHORT}}
          COMMIT_MSG=$PROJECT_NUMBER
          if [ "$PROJECT_NUMBER" != "$GIT_SHA_SHORT" ]; then COMMIT_MSG+=" ($GITHUB_SHA)"; fi
          echo "The project number is \"$PROJECT_NUMBER\" and the commit message is \"$COMMIT_MSG\""
          echo "::set-output name=project-number::$PROJECT_NUMBER"
          echo "::set-output name=commit-message::$COMMIT_MSG"

      - name: Install Doxygen
        env: 
          DOXYGEN_VERSION: 1.9.3
        run: |
          wget -q https://www.doxygen.nl/files/doxygen-${{ env.DOXYGEN_VERSION }}.linux.bin.tar.gz
          tar -xf doxygen-${{ env.DOXYGEN_VERSION }}.linux.bin.tar.gz
          cd doxygen-${{ env.DOXYGEN_VERSION }} && sudo make install
          sudo apt-get install libclang1-9 libclang-cpp9

      - name: Install Themes
        env:
          DOXYGEN_AWESOME_VERSION: 2.0.3
        working-directory: ./docs
        run: |
          git clone --depth 1 -b v${{ env.DOXYGEN_AWESOME_VERSION }} https://github.com/jothepro/doxygen-awesome-css

      - name: Generate Docs
        working-directory: ./docs
        run: |
          sed -i -E 's/(PROJECT_NUMBER\s*=\s*).*/\1 ${{ steps.repo-info.outputs.project-number }}/g' Doxyfile
          doxygen Doxyfile

      - name: Deploy Docs
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          publish_branch: gh-pages
          publish_dir: ./docs/html
          destination_dir: docs
          user_name: github-actions[bot]
          user_email: github-actions[bot]@users.noreply.github.com
          full_commit_message: Update docs for ${{ steps.repo-info.outputs.commit-message }}
