label-pr.yml

---
# Copyright 2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This workflow utilizes https://github.com/actions/github-script in GitHub Actions to apply labels to pull requests.
#
name: Label PR
on: [pull_request_target]
jobs:
  label:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    steps:
      - name: Label PR
        uses: actions/github-script@v6
        with:
          script: |-
            const keywords = {
              "breaking": "kind/breaking",
              "bug": "kind/bug",
              "feature": "kind/feature",
              "cleanup": "kind/cleanup",
              "documentation": "kind/documentation",
              "release": "kind/release"
            };
            const prBody = context.payload.pull_request.body;
            const prLabels = [];
            if (prBody === null || prBody.trim() === "") {
              console.log("Pull Request body is empty");
              prLabels.push("kind/other");
            } else {
              const regex = /^\s*\/kind\s+(.+)$/m;
              const match = prBody.match(regex);
              console.log(`PR body: '${prBody}'`);
              console.log(`Regex match: '${match}'`);
              if (match && match[1] in keywords) {
                const keyword = match[1];
                const label = keywords[keyword];
                console.log(`Adding label: '${label}' based on keyword '${keyword}'`);
                prLabels.push(label);
              } else {
                console.log(`Adding label: 'kind/other' as no matching keyword found.`);
                prLabels.push("kind/other");
              }
            }
            try {
              github.rest.issues.addLabels({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.pull_request.number,
                labels: prLabels
              });
            } catch (error) {
              console.error(`Error retrieving files: ${error}`);
            }