preview-docs.yml

name: fern

on: pull_request

jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Setup Node.js 
        uses: actions/setup-node@v4
        with:
          node-version: "18"

      - name: Install Fern
        run: npm install -g fern-api

      - name: Validate API configuration
        run: fern check
        
  preview-docs:
    needs: check
    runs-on: ubuntu-latest
    permissions: write-all
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Setup Node.js 
        uses: actions/setup-node@v4
        with:
          node-version: "18"

      - name: Install Fern
        run: npm install -g fern-api
        
      - name: Generate preview URL
        id: generate-docs
        env:
          FERN_TOKEN: ${{ secrets.FERN_TOKEN }}
        run: |
          OUTPUT="$(fern generate --docs --preview)"
          echo "Command Output: $OUTPUT"
          URL=$(echo "$OUTPUT" | grep -oP 'Published docs to \K.*(?= \()')
          echo "Preview your docs: $URL" > preview_url.txt

      - name: Comment URL in PR
        uses: thollander/actions-comment-pull-request@v2.4.3
        with:
          filePath: preview_url.txt