editor-changelog.yaml

name: Generate Editor Changelog

on:
  push:
    branches:
      - '**' # Runs on all branches

jobs:
  generate-changelog:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20

      - name: Install dependencies
        run: yarn

      - name: Get current version of editor package
        id: get_local_version
        run: |
          CURRENT_VERSION=$(node -p "require('./packages/editor/package.json').version")
          echo "CURRENT_VERSION=$CURRENT_VERSION" >> $GITHUB_ENV

      - name: Check if changelog for this version already exists
        id: check_existing_changelog
        run: |
          if [ -f packages/editor/CHANGELOG.md ] && grep -q "## Changelog for version $CURRENT_VERSION" packages/editor/CHANGELOG.md; then
            echo "changelog_exists=true" >> $GITHUB_ENV
          else
            echo "changelog_exists=false" >> $GITHUB_ENV
          fi

      - name: Get latest published version from npm
        if: env.changelog_exists == 'false'
        id: get_npm_version
        run: |
          NPM_VERSION=$(npm view @serlo/editor version)
          echo "NPM_VERSION=$NPM_VERSION" >> $GITHUB_ENV

      - name: Check if version has changed
        if: env.changelog_exists == 'false'
        id: check_version
        run: |
          if [ "$CURRENT_VERSION" != "$NPM_VERSION" ]; then
            echo "version_changed=true" >> $GITHUB_ENV
          else
            echo "version_changed=false" >> $GITHUB_ENV
          fi

      - name: Stop if version has not changed
        if: env.version_changed == 'false'
        run: exit 0

      - name: Get last tag for editor package (if available)
        if: env.version_changed == 'true'
        id: get_last_tag
        run: |
          git fetch --all --tags
          LAST_TAG=$(git describe --tags --match "v*-editor" --abbrev=0 2>/dev/null || echo "none")
          if [ "$LAST_TAG" == "none" ]; then
            echo "No previous tag found, this is the first release"
            echo "LAST_TAG=" >> $GITHUB_ENV
          else
            echo "LAST_TAG=$LAST_TAG" >> $GITHUB_ENV
          fi

      - name: Check if there are changes in packages/editor since last tag
        if: env.version_changed == 'true'
        id: check_editor_changes
        run: |
          if [ -z "$LAST_TAG" ]; then
            # No previous tag, assume all changes in editor are new
            echo "no_editor_changes=false" >> $GITHUB_ENV
          else
            # Compare changes since the last tag
            CHANGED_FILES=$(git diff --name-only $LAST_TAG HEAD -- packages/editor)
            if [ -z "$CHANGED_FILES" ]; then
              echo "no_editor_changes=true" >> $GITHUB_ENV
            else
              echo "no_editor_changes=false" >> $GITHUB_ENV
            fi
          fi

      - name: Stop if no changes in packages/editor
        if: env.no_editor_changes == 'true'
        run: exit 0

      - name: Get merged PRs affecting editor package (last 10 if no tag)
        if: env.version_changed == 'true' && env.no_editor_changes == 'false'
        id: get_prs
        run: |
          if [ -z "$LAST_TAG" ]; then
            # No tag, get last 10 PRs
            PRS=$(curl -s "https://api.github.com/repos/serlo/frontend/pulls?state=closed&per_page=10" | jq -r '.[] | .number' | tr '\n' ' ')
          else
            # Fetch PRs since last tag
            PRS=$(curl -s "https://api.github.com/repos/serlo/frontend/pulls?state=closed&per_page=100" | jq -r '.[] | select(.merged_at != null and .merged_at > $GITHUB_ENV.LAST_TAG and .head.repo.full_name == "serlo/frontend") | .number' | tr '\n' ' ')
          fi
          echo "PR_NUMBERS=$PRS" >> $GITHUB_ENV

      - name: Get PR titles that touched editor folder
        if: env.version_changed == 'true' && env.no_editor_changes == 'false'
        id: get_pr_titles
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PR_TITLES=""
          IFS=' ' read -r -a PR_ARRAY <<< "$PR_NUMBERS"
          echo "Processing ${#PR_ARRAY[@]} PRs"
          for pr in "${PR_ARRAY[@]}"; do
            echo "Checking PR #$pr"
            PR_DATA=$(curl -s -H "Authorization: token $GH_TOKEN" "https://api.github.com/repos/${{ github.repository }}/pulls/$pr")
            if [ $? -ne 0 ]; then
              echo "Error fetching PR data for #$pr"
              continue
            fi

            MERGED=$(echo "$PR_DATA" | jq -r '.merged')
            if [ "$MERGED" != "true" ]; then
              echo "PR #$pr was not merged, skipping"
              continue
            fi

            FILES=$(curl -s -H "Authorization: token $GH_TOKEN" "https://api.github.com/repos/${{ github.repository }}/pulls/$pr/files")
            if [ $? -ne 0 ]; then
              echo "Error fetching files for PR #$pr"
              continue
            fi

            if echo "$FILES" | jq -r '.[].filename' | grep -q "^packages/editor/"; then
              PR_TITLE=$(echo "$PR_DATA" | jq -r '.title')
              echo "PR #$pr touches editor package. Title: $PR_TITLE"
              PR_TITLES="${PR_TITLES}- ${PR_TITLE}\n"
            else
              echo "PR #$pr does not touch editor package"
            fi
          done
          echo "Final PR_TITLES: $PR_TITLES"
          if [ -n "$PR_TITLES" ]; then
            # Escape special characters and set PR_TITLES as an environment variable
            escaped_titles=$(printf '%s\n' "$PR_TITLES" | sed -e 's/"/\\"/g' -e 's/!/\\!/g')
            echo "PR_TITLES<<EOF" >> $GITHUB_ENV
            echo "$escaped_titles" >> $GITHUB_ENV
            echo "EOF" >> $GITHUB_ENV
          else
            echo "PR_TITLES=No relevant PRs found" >> $GITHUB_ENV
          fi
        shell: bash

      - name: Generate Changelog
        if: env.version_changed == 'true' && env.no_editor_changes == 'false' && env.PR_TITLES != 'No relevant PRs found'
        run: |
          echo "## Changelog for version $CURRENT_VERSION" > packages/editor/CHANGELOG.md
          echo "" >> packages/editor/CHANGELOG.md  # Adds a newline after the heading
          echo -e "$PR_TITLES" >> packages/editor/CHANGELOG.md

      - name: Run Prettier on Changelog
        if: env.version_changed == 'true' && env.no_editor_changes == 'false' && env.PR_TITLES != 'No relevant PRs found'
        run: yarn prettier -w packages/editor/CHANGELOG.md

      - name: Commit and Push Changelog
        if: env.version_changed == 'true' && env.no_editor_changes == 'false' && env.PR_TITLES != 'No relevant PRs found'
        run: |
          git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git config --local user.name "GitHub Action Bot"
          git add packages/editor/CHANGELOG.md
          git commit -m "chore: update changelog for version $CURRENT_VERSION"
          git push origin ${{ github.ref_name }}