design_token_diff.yml

name: Diff

on:
  pull_request:

jobs:
  changes:
    uses: ./.github/workflows/hasChanged.yml
  
  test:
    if: ${{ github.repository == 'primer/primitives' && needs.changes.outputs.outputAffected == 'true' }}
    name: Primitives v2
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Checkout reference branch
        uses: actions/checkout@v3
        with:
          ref: ${{ github.base_ref }}
          path: temp-main

      - name: Set up Node
        uses: actions/setup-node@v3
        with:
          node-version: 16
          cache: 'npm'

      - name: Cache dependencies
        uses: actions/cache@v3
        with:
          path: ~/.npm
          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
          restore-keys: |
            ${{ runner.os }}-node-

      - name: Install dependencies
        run: npm install --legacy-peer-deps --ignore-scripts

      - name: Install dependencies (reference)
        run: pushd temp-main; npm install --legacy-peer-deps --ignore-scripts; popd

      - name: Build
        run: npm run build:tokens

      - name: Build (reference)
        run: pushd temp-main; npm run build:tokens; popd

      - name: Export diff
        run: |
          diff -r -y --width=150 -B -I '*' -I 'Generated' --suppress-common-lines temp-main/tokens-v2-private/css tokens-v2-private/css  | tail -n +2 > diff.txt
          npx ts-node ./scripts/ci-check-diff.ts

      - name: Read raw diff
        if: hashFiles('diff.md') != ''
        id: diff
        uses: juliangruber/read-file-action@v1
        with:
          path: ./diff.md

      - name: Post diff
        if: hashFiles('diff.md') != ''
        uses: phulsechinmay/rewritable-pr-comment@v0.3.0
        with:
          message: ${{ steps.diff.outputs.content }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          COMMENT_IDENTIFIER: 'primitives-diff'

      - name: Comment on the PR about no results
        if: hashFiles('diff.md') == ''
        uses: phulsechinmay/rewritable-pr-comment@v0.3.0
        with:
          message: |
            ### 🟢 No design token changes found
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          COMMENT_IDENTIFIER: 'primitives-diff'