release.yml

name: Release

on:
  push:
    branches: [release]

permissions:
  contents: write

jobs:
  release:
    runs-on: ubuntu-latest
    # Skip version bump commits
    if: "!contains(github.event.head_commit.message, '[skip ci]')"

    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Use Node.js 20.x
        uses: actions/setup-node@v6
        with:
          node-version: 20.x

      - name: Configure git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

      - name: Get version from package.json
        id: package-version
        run: echo "version=$(node -p "require('./package.json').version")" >> $GITHUB_OUTPUT

      - name: Check if tag exists
        id: tag-check
        run: |
          if git rev-parse "v${{ steps.package-version.outputs.version }}" >/dev/null 2>&1; then
            echo "exists=true" >> $GITHUB_OUTPUT
          else
            echo "exists=false" >> $GITHUB_OUTPUT
          fi

      - name: Generate changelog
        id: changelog
        if: steps.tag-check.outputs.exists == 'false'
        run: |
          VERSION="${{ steps.package-version.outputs.version }}"
          MAJOR_MINOR=$(echo $VERSION | cut -d. -f1-2)

          # Try exact version first (e.g., v0.10.5.md), then minor.x pattern (e.g., v0.10.x.md)
          CHANGELOG_FILE_EXACT=".changelog/v${VERSION}.md"
          CHANGELOG_FILE_PATTERN=".changelog/v${MAJOR_MINOR}.x.md"

          if [ -f "$CHANGELOG_FILE_EXACT" ]; then
            # Use exact version changelog
            CHANGELOG=$(cat "$CHANGELOG_FILE_EXACT")
          elif [ -f "$CHANGELOG_FILE_PATTERN" ]; then
            # Use minor version pattern changelog (e.g., v0.10.x.md)
            CHANGELOG=$(cat "$CHANGELOG_FILE_PATTERN")
            # Replace version placeholder with actual version
            CHANGELOG=$(echo "$CHANGELOG" | sed "s/v${MAJOR_MINOR}.x/v${VERSION}/g" | sed "s/${MAJOR_MINOR}.x/${VERSION}/g")
          else
            # Fallback: Generate changelog from commits (exclude [skip ci] commits)
            PREV_TAG=$(git describe --tags --abbrev=0 2>/dev/null || git rev-list --max-parents=0 HEAD)
            COMMIT_LOG=$(git log $PREV_TAG..HEAD --pretty=format:"- %s" --no-merges | grep -v "\[skip ci\]" | head -50)

            # Create a basic changelog structure
            CHANGELOG="# Release v${VERSION}

          ## Changes

          ${COMMIT_LOG}

          ## Installation

          \`\`\`bash
          git clone https://github.com/atomantic/SparseTree.git
          cd SparseTree
          npm run install:all
          pm2 start ecosystem.config.cjs
          \`\`\`"
          fi

          # Handle multiline output
          echo "changelog<<EOF" >> $GITHUB_OUTPUT
          echo "$CHANGELOG" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Create Release
        if: steps.tag-check.outputs.exists == 'false'
        uses: softprops/action-gh-release@v2
        with:
          tag_name: v${{ steps.package-version.outputs.version }}
          name: v${{ steps.package-version.outputs.version }}
          body: ${{ steps.changelog.outputs.changelog }}
          draft: false
          prerelease: false
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Archive changelog on main
        if: steps.tag-check.outputs.exists == 'false'
        run: |
          CURRENT_VERSION=${{ steps.package-version.outputs.version }}
          MAJOR=$(echo $CURRENT_VERSION | cut -d. -f1)
          MINOR=$(echo $CURRENT_VERSION | cut -d. -f2)
          MAJOR_MINOR="$MAJOR.$MINOR"

          PATTERN_FILE=".changelog/v${MAJOR_MINOR}.x.md"
          VERSIONED_FILE=".changelog/v${CURRENT_VERSION}.md"

          if [ -f "$PATTERN_FILE" ]; then
            # Archive directly on main so release never diverges
            git fetch origin main
            git checkout main

            git mv "$PATTERN_FILE" "$VERSIONED_FILE"
            sed -i.bak "s/v${MAJOR_MINOR}\.x/v${CURRENT_VERSION}/g; s/${MAJOR_MINOR}\.x/${CURRENT_VERSION}/g; s/YYYY-MM-DD/$(date +%Y-%m-%d)/g" "$VERSIONED_FILE"
            rm "${VERSIONED_FILE}.bak"

            git add "$VERSIONED_FILE"
            git commit -m "docs: archive changelog for v${CURRENT_VERSION} [skip ci]"
            git push origin main

            # Fast-forward release to match main
            git push origin main:release
          fi