triage.yaml

# https://docs.github.com/en/actions

name: "Triage"

on: # yamllint disable-line rule:truthy
  pull_request_target:
    types:
      - "opened"

jobs:
  label:
    name: "Label"

    runs-on: "ubuntu-latest"

    steps:
      - name: "Add labels based on branch name"
        uses: "actions/github-script@v7"
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"
          script: |
            const branchPrefixLabels = {
              feature: "enhancement",
              fix: "bug",
            };

            const pullRequest = context.payload.pull_request;
            const repository = context.repo;

            const branchName = pullRequest.head.ref;

            const matches = branchName.match(new RegExp('^([^/]+)\/'));

            if (matches instanceof Array && branchPrefixLabels.hasOwnProperty(matches[1])) {
              const label = branchPrefixLabels[matches[1]];

              github.rest.issues.addLabels({
                issue_number: pullRequest.number,
                labels: [
                  label
                ],
                owner: repository.owner,
                repo: repository.repo,
              });
            }