prettier.yml

name: Prettier

on:
  pull_request:
    paths:
      - 'src/**/*.js'
      - '.github/workflows/prettier.yml'
    types:
      - opened
      - synchronize
      - reopened
      - ready_for_review
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - uses: actions/setup-node@v4
        with:
          node-version: 'latest'
      - name: Install Node dependencies
        run: npm ci
      - name: Run Prettier on changed files
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          git fetch origin main
          # Check for changed JavaScript files.
          CHANGED_FILES=$(git diff --name-only origin/main...HEAD | grep -E '\.js$|\.jsx$|\.ts$|\.tsx$' || echo "")
          # If JavaScript files have changed, run Prettier.
          if [ -n "$CHANGED_FILES" ]; then
            echo "Fixing the following files:"
            echo "$CHANGED_FILES"

            # Run Prettier on the changed files.
            echo "$CHANGED_FILES" | xargs npx prettier --write
            
            # Join the filenames into a single line with space separation.
            JOINED_FILES=$(echo $CHANGED_FILES | tr '\n' ' ')
            echo "CHANGED_FILES=$JOINED_FILES" >> $GITHUB_ENV
          else
            echo "No files to format"
          fi
      - name: Commit and push Prettier changes
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          # Did we make changes when we ran Prettier?
          if [ -n "$(git status --porcelain)" ]; then
            git config user.name "Pantheon Bot"
            git config user.email "bot@getpantheon.com"
            git add .
            git commit -m "Apply Prettier formatting"
            git push origin HEAD:${{ github.head_ref }}

            DIFF_OUTPUT=$(git diff HEAD~1 HEAD)
            echo "DIFF_OUTPUT<<EOF" >> $GITHUB_ENV
            echo "$DIFF_OUTPUT" >> $GITHUB_ENV
            echo "EOF" >> $GITHUB_ENV
          else
            echo "No changes to commit"
          fi
      - name: Set Prettier diff output
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          if [ -n "${{ env.DIFF_OUTPUT }}" ]; then
            CURRENT_COMMIT=$(git rev-parse --short HEAD)
            gh pr comment ${{ github.event.pull_request.number }} --body "$(echo -e "Hi from your friendly robot! 🤖\n\nI've applied Prettier formatting to the following files in $CURRENT_COMMIT:\n\n\`${{ env.CHANGED_FILES }}\`\n\nThe full diff is below. Please review the changes.\n\n<details>\n<summary>Click to expand</summary>\n\n\`\`\`diff\n$DIFF_OUTPUT\n\`\`\`\n</details>")"
          else
            echo "No Prettier changes"
          fi