# Posts a comment listing all the colors that changed in a PR
name: Diff
on:
  pull_request:
    branches-ignore:
      - 'test/**'
jobs:
  comment:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Set up node
        uses: actions/setup-node@v2
        with:
          node-version: 14

      - name: Create comment (if necessary)
        uses: actions/github-script@v5
        with:
          script: |
            const fs = require('fs')
            const body = fs.readFileSync('.github/diff_comment_template.md', 'utf8')
            const result = await github.rest.issues.listComments({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo
            });
            console.log(result.data)
            const botComments = result.data.filter(c => c.user.login === 'github-actions[bot]')
            if (!botComments.length) {
              await github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body
              })
            }

  diff:
    needs: comment
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v2

      - name: Checkout base branch
        uses: actions/checkout@v2
        with:
          ref: ${{ github.base_ref }}
          path: base

      - name: Set up Node
        uses: actions/setup-node@v2
        with:
          node-version: 14

      - name: Install dependencies
        run: yarn

      - name: Build
        run: yarn build

      - name: Install dependencies (base)
        run: pushd base; yarn; popd

      - name: Build (base)
        run: pushd base; yarn build; popd

      - name: Diff
        uses: primer/comment-token-update@main
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GITHUB_USER: github-actions[bot]
        with:
          # This action will find the first comment by `github-actions[bot]` and
          # insert the diff data if `<!-- diff --><!-- /diff -->` is present in that comment.
          # If there are multiple comments by `github-actions[bot]`
          # or if `<!-- diff --><!-- /diff -->` is missing,
          # this action may not work as expected.
          comment-token: 'diff'
          script: |
            diff=$(for file in themes/*.json
              do
                diff -U 1 base/$file $file
              done)

            echo "\`\`\`diff"

            if [[ $diff ]]
            then
              echo "$diff"
            else
              echo "No colors changed"
            fi

            echo "\`\`\`"