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:
  workflow_dispatch:
  pull_request:
    types: 
      -opened 
      -reopened 
      -closed

jobs:
  label:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write

    steps:

      - name: Label PR
        uses: actions/github-script@v4
        with:
          async: yes
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const keywords = {
              "breaking": "kind/breaking",
              "bug": "kind/bug",
              "feature": "kind/feature",
              "cleanup": "kind/cleanup",
              "documentation": "kind/documentation",
              "hotfix": "kind/hotfix"
            };

            const prBody = context.payload.pull_request.body;
            const prLabels = [];

            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 {
              await github.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}`);
            }