auto_pr_review.yaml

name: "PR review"
on:
  pull_request_target:
    types: [opened, reopened, synchronize, edited, edited]

jobs:
  labeler:
    name: apply labels
    permissions:
      contents: read
      pull-requests: write
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
      with:
        submodules: false
    - uses: actions/labeler@v5.0.0
      with:
        dot: true
        configuration-path: .github/labeler.yaml

  pr_branch_check:
    name: check branch
    runs-on: ubuntu-latest
    if: github.repository == 'commaai/openpilot'
    steps:
    - uses: Vankka/pr-target-branch-action@69ab6dd5c221de3548b3b6c4d102c1f4913d3baa
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      with:
        target: /^(?!master$).*/
        exclude: /commaai:.*/
        change-to: ${{ github.base_ref }}
        already-exists-action: close_this
        already-exists-comment: "Your PR should be made against the `master` branch"

  check-pr-template:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
      pull-requests: write
      actions: read
    if: github.event.pull_request.head.repo.full_name != 'commaai/openpilot'
    steps:
      - uses: actions/github-script@v7
        with:
          script: |
            // Comment to add to the PR if no template has been used
            const NO_TEMPLATE_MESSAGE =
              "It looks like you didn't use one of the Pull Request templates. Please check [the contributing docs](https://github.com/commaai/openpilot/blob/master/docs/CONTRIBUTING.md). \
            Also make sure that you didn't modify any of the checkboxes or headings within the template.";
            // body data for future requests
            const body_data = {
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
            };

            // Utility function to extract all headings
            const extractHeadings = (markdown) => {
              const headingRegex = /^(#{1,6})\s+(.+)$/gm;
              const boldTextRegex = /^(?:\*\*|__)(.+?)(?:\*\*|__)\s*$/gm;
              const headings = [];
              let headingMatch;
              while ((headingMatch = headingRegex.exec(markdown))) {
                headings.push(headingMatch[2].trim());
              }
              let boldMatch;
              while ((boldMatch = boldTextRegex.exec(markdown))) {
                headings.push(boldMatch[1].trim());
              }
              return headings;
            };

            // Utility function to extract all check box descriptions
            const extractCheckBoxTexts = (markdown) => {
              const checkboxRegex = /^\s*-\s*\[( |x)\]\s+(.+)$/gm;
              const checkboxes = [];
              let match;
              while ((match = checkboxRegex.exec(markdown))) {
                checkboxes.push(match[2].trim());
              }
              return checkboxes;
            };

            // Utility function to check if a list is a subset of another list
            isSubset = (subset, superset) => {
              return subset.every((item) => superset.includes(item));
            };

            // Utility function to check if a list of checkboxes is a subset of another list of checkboxes
            isCheckboxSubset = (templateCheckBoxTexts, prTextCheckBoxTexts) => {
              // Check if each template checkbox text is a substring of at least one PR checkbox text 
              // (user should be allowed to add additional text)
              return templateCheckBoxTexts.every((item) => prTextCheckBoxTexts.some((element) => element.includes(item)))
            }

            // Get filenames of all currently checked-in PR templates
            const template_contents = await github.rest.repos.getContent({
              owner: context.repo.owner,
              repo: context.repo.repo,
              path: ".github/PULL_REQUEST_TEMPLATE",
            });
            var template_filenames = [];
            for (const content of template_contents.data) {
              template_filenames.push(content.path);
            }
            console.debug("Received template filenames: " + template_filenames);
            // Retrieve templates
            var templates = [];
            for (const template_filename of template_filenames) {
              const template_response = await github.rest.repos.getContent({
                owner: context.repo.owner,
                repo: context.repo.repo,
                path: template_filename,
              });
              // Convert Base64 content back
              const decoded_template = atob(template_response.data.content);
              const headings = extractHeadings(decoded_template);
              const checkboxes = extractCheckBoxTexts(decoded_template);
              if (!headings.length && !checkboxes.length) {
                console.warn(
                  "Invalid template! Contains neither headings nor checkboxes, ignoring it: \n" +
                    decoded_template
                );
              } else {
                templates.push({ headings: headings, checkboxes: checkboxes });
              }
            }
            // Retrieve the PR Body
            const pull_request = await github.rest.issues.get({
              ...body_data,
            });
            const pull_request_text = pull_request.data.body;
            console.debug("Received Pull Request body: \n" + pull_request_text);

            /* Check if the PR Body matches one of the templates
            A template is defined by all headings and checkboxes it contains
            We extract all Headings and Checkboxes from the PR text and check if any of the templates is a subset of that
            */
            const pr_headings = extractHeadings(pull_request_text);
            const pr_checkboxes = extractCheckBoxTexts(pull_request_text);
            console.debug("Found Headings in PR body:\n" + pr_headings);
            console.debug("Found Checkboxes in PR body:\n" + pr_checkboxes);
            var template_found = false;
            // Iterate over each template to check if it applies
            for (const template of templates) {
              console.log(
                "Checking for headings: [" +
                  template.headings +
                  "] and checkboxes: [" +
                  template.checkboxes + "]"
              );
              if (
                isCheckboxSubset(template.checkboxes, pr_checkboxes) &&
                isSubset(template.headings, pr_headings)
              ) {
                console.debug("Found matching template!");
                template_found = true;
              }
            }

            // List comments from previous runs
            var existing_comments = [];
            const comments = await github.rest.issues.listComments({
              ...body_data,
            });
            for (const comment of comments.data) {
              if (comment.body === NO_TEMPLATE_MESSAGE) {
                existing_comments.push(comment);
              }
            }

            // Add a comment to the PR that it is not using a the template (but only if this comment does not exist already)
            if (!template_found) {
              var comment_already_sent = false;

              // Add an 'in-bot-review' label since this PR doesn't have the template
              github.rest.issues.addLabels({
                ...body_data,
                labels: ["in-bot-review"],
              });

              if (existing_comments.length < 1) {
                github.rest.issues.createComment({
                  ...body_data,
                  body: NO_TEMPLATE_MESSAGE,
                });
              }
            } else {
              // If template has been found, delete any old comment about missing template
              for (const existing_comment of existing_comments) {
                github.rest.issues.deleteComment({
                  ...body_data,
                  comment_id: existing_comment.id,
                });
              }
              // Remove the 'in-bot-review' label after the review is done and the PR has passed
              github.rest.issues.removeLabel({
                ...body_data,
                name: "in-bot-review",
              }).catch((error) => {
                console.log("Label 'in-bot-review' not found, ignoring");
              });
            }