free-programming-books/.github/workflows/comment-pr.yml

name: Comment on the pull request

on:
  workflow_run:
    workflows: ["free-programming-books-lint"]
    types:
      - completed

jobs:
  upload:
    permissions:
      pull-requests: write
    runs-on: ubuntu-latest
    if: >
      ${{ github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success' }}      
    steps:
      - name: 'Download artifact'
        uses: actions/github-script@v7
        with:
          script: |
            let allArtifacts = await github.rest.actions.listWorkflowRunArtifacts({
               owner: context.repo.owner,
               repo: context.repo.repo,
               run_id: context.payload.workflow_run.id,
            });
            let matchArtifact = allArtifacts.data.artifacts.filter((artifact) => {
              return artifact.name == "pr"
            })[0];
            let download = await github.rest.actions.downloadArtifact({
               owner: context.repo.owner,
               repo: context.repo.repo,
               artifact_id: matchArtifact.id,
               archive_format: 'zip',
            });
            let fs = require('fs');
            fs.writeFileSync(`${process.env.GITHUB_WORKSPACE}/pr.zip`, Buffer.from(download.data));            

      - name: 'Unzip artifact'
        run: unzip pr.zip

      - name: 'Comment on PR'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          if [ -s error.log ]
          then
            gh pr comment $(<PRurl) -b "Linter failed, fix the error(s):
            \`\`\`
            $(cat error.log)
            \`\`\`"
            gh pr edit $(<PRurl) --add-label "linter error"
          else
            gh pr edit $(<PRurl) --remove-label "linter error"
          fi