commands.yml

name: Commands on PR
on:
  issue_comment:
    types: [created]

permissions:
  contents: write
  issues: write
  pull-requests: write

jobs:
  run_command:
    if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/run')
    runs-on: ubuntu-20.04
    steps:
      - name: Extract command to run
        uses: actions/github-script@v3
        id: command-extractor
        with:
          result-encoding: string
          script: |
            if (context.eventName !== "issue_comment") throw "Error: This action only works on issue_comment events.";

            // extract the command to run, allowed characters: a-z, A-Z, digits, hyphen, underscore
            const regex = /^\/run ([a-zA-Z\d\-\_]+)/;
            command = regex.exec(context.payload.comment.body);
            if (command == null) throw "Error: No command found in the trigger phrase.";

            return command[1];
      - name: Get github ref
        uses: actions/github-script@v3
        id: get-pr
        with:
          script: |
            const result = await github.pulls.get({
              pull_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
            });
            return { "ref": result.data.head.ref, "repository": result.data.head.repo.full_name};
      - name: Checkout repo
        uses: actions/checkout@v2
        with:
          repository: ${{ fromJson(steps.get-pr.outputs.result).repository }}
          ref: ${{ fromJson(steps.get-pr.outputs.result).ref }}
          fetch-depth: 0
      - name: Install dotnet
        uses: actions/setup-dotnet@v3
      - name: Install dotnet tools
        run: dotnet tool restore
      - name: Process fantomas command
        if: steps.command-extractor.outputs.result == 'fantomas'
        id: fantomas
        run: dotnet fantomas . -r
      - name: Commit and push changes
        if: steps.fantomas.outcome == 'success' || steps.xlf.outcome == 'success'
        run: |
          git config --local user.name "github-actions[bot]"
          git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git commit -a -m 'Automated command ran: ${{ steps.command-extractor.outputs.result }}

            Co-authored-by: ${{ github.event.comment.user.login }} <${{ github.event.comment.user.id }}+${{ github.event.comment.user.login }}@users.noreply.github.com>'
          git push
      - name: Post command comment
        if: steps.fantomas.outcome == 'success'
        uses: actions/github-script@v3
        with:
          script: |
            // Probably, there's more universal way of getting outputs, but my gh-actions-fu is not that good.
            var output = ""
            if ("${{steps.command-extractor.outputs.result}}" == 'fantomas') {
              output = "${{steps.fantomas.outputs.result}}"
            } else if("${{steps.command-extractor.outputs.result}}" == 'xlf') {
              output = "${{steps.xlf.outputs.result}}"
            }
            const body = `Ran ${{ steps.command-extractor.outputs.result }}: https://github.com/${context.repo.owner}/${context.repo.repo}/actions/runs/${process.env.GITHUB_RUN_ID}\n${output}`;
            await github.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: body
            });
      - name: Post command failed comment
        if: failure()
        uses: actions/github-script@v3
        with:
          script: |
            const body = `Failed to run ${{ steps.command-extractor.outputs.result }}: https://github.com/${context.repo.owner}/${context.repo.repo}/actions/runs/${process.env.GITHUB_RUN_ID}`;
            await github.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: body
            });