jj-vcs-jj/.github/workflows/review.yml

name: Pull request reviews

on:
  pull_request_review:
    types: [submitted]

jobs:
  check-author:
    if: github.event.review.state == 'approved'
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
      contents: read
      issues: write
    steps:
      - name: Check if PR author is a contributor
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd
        with:
          script: |
            const { pull_request, review } = context.payload;
            const { owner, repo } = context.repo;

            const author = pull_request.user.login;
            const reviewer = review.user.login;

            const blacklistedAuthors = [
              "dependabot[bot]",
            ];

            if (blacklistedAuthors.includes(author)) {
              core.info("Author is blacklisted from nudge, skipping.");
              return;
            }

            if (reviewer === author) {
              core.info("Author reviewed their own pull request, skipping.");
              return;
            }

            const getPermissionLevel = async (username) => {
              const { data } = await github.rest.repos.getCollaboratorPermissionLevel({
                username,
                owner,
                repo,
              });

              return data.permission;
            };

            const isMaintainer = async (username) =>
              ["maintain", "admin"].includes(await getPermissionLevel(username));

            const isContributor = async (username) =>
              ["write", "maintain", "admin"].includes(await getPermissionLevel(username));

            if (await isContributor(author)) {
              core.info(`Author @${author} already has write access.`);
              return;
            }

            if (!await isMaintainer(reviewer)) {
              core.info(`Reviewer @${reviewer} is not a maintainer.`);
              return;
            }

            const comments = await github.paginate(github.rest.issues.listComments, {
              issue_number: pull_request.number,
              per_page: 100,
              owner,
              repo,
            });

            const nudgeMarker = "<!-- @jj-vcs/contributors nudge -->";

            if (comments.some(c => (c.body || "").includes(nudgeMarker))) {
              core.info("Reviewer has already been nudged.");
              return;
            };

            const body = `Hey @martinvonz! Please `
              + `make sure to add ${author} to jj-vcs/contributors so they `
              + "can merge their pull request. Feel free to also drop a note "
              + "in Discord so they can get their contributor role. Thanks!";

            await github.rest.issues.createComment({
              issue_number: pull_request.number,
              body: nudgeMarker + body,
              owner,
              repo,
            });

            core.notice(`Pinged martinvonz to add ${author} to jj-vcs/contributors.`);