auto-change-pr.yml

name: Automatically labeling pull request.

on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  auto-change-pr:
    runs-on: ubuntu-latest

    env:
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      PR_NUMBER: ${{ github.event.pull_request.number }}
      PR_ASSIGNEE: ${{ github.event.pull_request.user.login }}
      PR_BRANCH: ${{ github.event.pull_request.head.ref }}

    steps:
      - uses: actions/checkout@v2

      # 変更されたファイルを取得
      - name: get changed files
        uses: dorny/paths-filter@v2
        id: changes
        with:
          filters: |
            frontend:
              - 'frontend/**'
            backend:
              - 'api/**'
              - 'auth/**'
            infra:
              - 'cloudflare/**'
              - 'docker-compose.*'
              - '**/*Dockerfile'

      # ブランチ名からラベル名を取得
      - uses: actions/github-script@v6
        id: label_name
        with:
          github-token: ${{ env.GH_TOKEN }}
          script: |
            const env = process.env;
            const branchType = env.PR_BRANCH.split('/')[0]
            const branchTypeToLabel = {
                feature: 'enhancement',
                fix: 'bug',
                hotfix: 'bug',
              };
            core.setOutput('label_name', branchTypeToLabel[branchType] || '')

      # PRにラベルを付与
      - name: Auto frontend labeling
        if: steps.changes.outputs.frontend == 'true'
        run: gh pr edit ${{ env.PR_NUMBER }} --add-label frontend
      - name: Auto backend labeling
        if: steps.changes.outputs.backend == 'true'
        run: gh pr edit ${{ env.PR_NUMBER }} --add-label backend
      - name: Auto infra labeling
        if: steps.changes.outputs.infra == 'true'
        run: gh pr edit ${{ env.PR_NUMBER }} --add-label infra
      - name: Auto labeling
        if: steps.label_name.outputs.label_name
        run: gh pr edit ${{ env.PR_NUMBER }} --add-label ${{ steps.label_name.outputs.label_name }}

      # PRにAssigneeを付与
      - name: Auto assignee
        if: toJSON(github.event.pull_request.assignees) == '[]'
        run: gh pr edit ${{ env.PR_NUMBER }} --add-assignee ${{ env.PR_ASSIGNEE }}