changeset-bot.yml

name: Changeset Bot

on:
  issue_comment:
    types: [created]

jobs:
  changeset:
    name: Create Changeset
    if: |
      github.event.issue.pull_request &&
      startsWith(github.event.comment.body, '/changeset')
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write

    steps:
      - name: React to comment
        uses: actions/github-script@v7
        with:
          script: |
            await github.rest.reactions.createForIssueComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: context.payload.comment.id,
              content: 'eyes'
            });

      - name: Get PR branch
        id: pr
        uses: actions/github-script@v7
        with:
          script: |
            const pr = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number
            });
            core.setOutput('branch', pr.data.head.ref);
            core.setOutput('title', pr.data.title);

      - name: Checkout PR branch
        uses: actions/checkout@v4
        with:
          ref: ${{ steps.pr.outputs.branch }}
          fetch-depth: 0

      - name: Install pnpm
        uses: pnpm/action-setup@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'pnpm'

      - name: Install dependencies
        run: pnpm install --frozen-lockfile

      - name: Parse command
        id: parse
        uses: actions/github-script@v7
        with:
          script: |
            const comment = context.payload.comment.body.trim();
            const lines = comment.split('\n');
            const firstLine = lines[0].trim();

            // Parse: /changeset [patch|minor|major] [package1,package2]
            const match = firstLine.match(/^\/changeset\s+(patch|minor|major)(?:\s+(.+))?$/i);

            if (!match) {
              core.setFailed('Invalid format. Use: /changeset <patch|minor|major> [package1,package2]');
              return;
            }

            const bump = match[1].toLowerCase();
            const packagesArg = match[2];

            // Get summary from rest of comment or PR title
            let summary = lines.slice(1).join('\n').trim();
            if (!summary) {
              summary = '${{ steps.pr.outputs.title }}';
            }

            core.setOutput('bump', bump);
            core.setOutput('packages', packagesArg || '');
            core.setOutput('summary', summary);

      - name: Get changed packages
        id: packages
        run: |
          if [ -n "${{ steps.parse.outputs.packages }}" ]; then
            echo "packages=${{ steps.parse.outputs.packages }}" >> $GITHUB_OUTPUT
          else
            # Auto-detect from changed files
            CHANGED=$(git diff --name-only origin/main...HEAD | grep -E "^(ts-cache|storages)/" | cut -d'/' -f1-2 | sort -u | tr '\n' ',' | sed 's/,$//')
            if [ -z "$CHANGED" ]; then
              CHANGED="ts-cache"
            fi
            echo "packages=$CHANGED" >> $GITHUB_OUTPUT
          fi

      - name: Create changeset
        run: |
          BUMP="${{ steps.parse.outputs.bump }}"
          PACKAGES="${{ steps.packages.outputs.packages }}"
          SUMMARY="${{ steps.parse.outputs.summary }}"

          # Generate random filename
          FILENAME=".changeset/$(echo $RANDOM | md5sum | head -c 12).md"

          # Map folder names to package names
          get_package_name() {
            case "$1" in
              ts-cache) echo "@node-ts-cache/core" ;;
              storages/lru) echo "@node-ts-cache/lru-storage" ;;
              storages/redis) echo "@node-ts-cache/redis-storage" ;;
              storages/redisio) echo "@node-ts-cache/ioredis-storage" ;;
              storages/node-cache) echo "@node-ts-cache/node-cache-storage" ;;
              storages/lru-redis) echo "@node-ts-cache/lru-redis-storage" ;;
              *) echo "$1" ;;
            esac
          }

          # Create changeset content
          echo "---" > "$FILENAME"

          IFS=',' read -ra PKGS <<< "$PACKAGES"
          for pkg in "${PKGS[@]}"; do
            pkg=$(echo "$pkg" | xargs)  # trim whitespace
            pkg_name=$(get_package_name "$pkg")
            echo "\"$pkg_name\": $BUMP" >> "$FILENAME"
          done

          echo "---" >> "$FILENAME"
          echo "" >> "$FILENAME"
          echo "$SUMMARY" >> "$FILENAME"

          echo "Created changeset:"
          cat "$FILENAME"

      - name: Commit and push
        run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "github-actions[bot]@users.noreply.github.com"
          git add .changeset/
          git commit -m "chore: add changeset"
          git push

      - name: React success
        uses: actions/github-script@v7
        with:
          script: |
            await github.rest.reactions.createForIssueComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: context.payload.comment.id,
              content: 'rocket'
            });

      - name: Comment success
        uses: actions/github-script@v7
        with:
          script: |
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: `✅ Changeset created!\n\n**Type:** ${{ steps.parse.outputs.bump }}\n**Packages:** ${{ steps.packages.outputs.packages }}\n**Summary:** ${{ steps.parse.outputs.summary }}`
            });

      - name: React failure
        if: failure()
        uses: actions/github-script@v7
        with:
          script: |
            await github.rest.reactions.createForIssueComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: context.payload.comment.id,
              content: 'confused'
            });

      - name: Comment failure
        if: failure()
        uses: actions/github-script@v7
        with:
          script: |
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: `❌ Failed to create changeset. Please check the [workflow run](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}) for details.\n\n**Usage:**\n\`\`\`\n/changeset patch\n/changeset minor\n/changeset major @node-ts-cache/core,@node-ts-cache/lru-storage\n\`\`\`\n\nAdd a summary on the next line:\n\`\`\`\n/changeset patch\nFixed a bug in cache expiration\n\`\`\``
            });