# Generate PR or issue title using AI

name: Title

on:
  issue_comment:
    types: [created]
  pull_request:
    paths:
      - ".github/workflows/title.yml"
      - ".github/workflows/title.js"

defaults:
  run:
    shell: bash

permissions: {}

jobs:
  title:
    runs-on: ubuntu-slim
    timeout-minutes: 5
    # Trigger conditions:
    # - pull_request: skip fork PRs (no access to secrets)
    # - issue_comment: only maintainers can trigger via `/title` on PRs or issues
    if: >
      (
        github.event_name == 'pull_request'
        && github.event.pull_request.head.repo.full_name == github.repository
      )
      || (
        startsWith(github.event.comment.body, '/title')
        && contains(fromJSON('["OWNER", "MEMBER", "COLLABORATOR"]'), github.event.comment.author_association)
      )
    permissions:
      pull-requests: write
      issues: write
    env:
      NUMBER: ${{ github.event.pull_request.number || github.event.issue.number }}
      REPO: ${{ github.repository }}
      COMMENT_ID: ${{ github.event.comment.id }}
    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
          sparse-checkout: .github/workflows/title.js
          sparse-checkout-cone-mode: false

      - name: Add reaction to comment
        if: github.event_name != 'pull_request'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh api \
            --method POST \
            "/repos/$REPO/issues/comments/$COMMENT_ID/reactions" \
            -f content='eyes'

      - name: Generate new title
        id: generate
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
          IS_PR: ${{ github.event_name == 'pull_request' || github.event.issue.pull_request != null }}
        with:
          retries: 3
          script: |
            const script = require('./.github/workflows/title.js');
            await script({ github, context, core });

      - name: Update title
        if: github.event_name != 'pull_request'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          NEW_TITLE: ${{ steps.generate.outputs.new_title }}
        run: |
          if [ -z "$NEW_TITLE" ]; then
            echo "Error: Generated title is empty"
            exit 1
          fi
          gh issue edit "$NUMBER" --repo "$REPO" --title "$NEW_TITLE"

      - name: Post failure comment
        if: failure() && github.event_name != 'pull_request'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
        run: |
          gh issue comment "$NUMBER" --repo "$REPO" --body \
            "> [!WARNING]
            > Failed to generate the title. See [workflow run]($RUN_URL) for details."