DankMaterialShell/.github/workflows/pr-labels.yml

name: PR Labels

# pull_request_target: never check out PR code here, the token has write access

on:
  pull_request_target:
    types: [opened, edited, reopened, synchronize]

permissions:
  contents: read
  issues: write
  pull-requests: write

concurrency:
  group: pr-labels-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  label:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v7
        with:
          script: |
            const pr = context.payload.pull_request;
            const body = pr.body || "";

            const checked = [...body.matchAll(/^\s*-\s*\[[xX]\]\s*(.+)$/gm)].map(m => m[1].trim());
            const typeOfChange = {
              "Bug fix": "fix",
              "New feature": "feature",
              "Breaking change": "breaking",
              "Refactor / internal cleanup": "internal",
              "Documentation": "docs",
            };
            const labels = new Set(
              Object.entries(typeOfChange)
                .filter(([item]) => checked.some(line => line.startsWith(item)))
                .map(([, label]) => label)
            );

            const files = await github.paginate(github.rest.pulls.listFiles, {
              ...context.repo,
              pull_number: pr.number,
              per_page: 100,
            });
            const paths = files.map(f => f.filename);
            const pathRules = [
              ["packaging", p => p.startsWith("distro/") || p === "flake.nix" || p === "flake.lock"],
              ["i18n", p => p.startsWith("quickshell/translations/poexports/")],
              ["core", p => p.startsWith("core/")],
              ["ui", p => p.startsWith("quickshell/") && !p.startsWith("quickshell/translations/")],
            ];
            for (const [label, matches] of pathRules) {
              if (paths.some(matches)) labels.add(label);
            }

            const existing = new Set(pr.labels.map(l => l.name));
            const missing = [...labels].filter(l => !existing.has(l));
            if (missing.length === 0) return core.info("nothing to add");

            const areaLabels = {
              core: ["Go daemon and CLI under core/", "1d76db"],
              ui: ["Quickshell UI under quickshell/", "c5def5"],
            };
            for (const name of missing.filter(l => l in areaLabels)) {
              const [description, color] = areaLabels[name];
              try {
                await github.rest.issues.getLabel({ ...context.repo, name });
              } catch (error) {
                if (error.status !== 404) throw error;
                await github.rest.issues.createLabel({ ...context.repo, name, description, color });
              }
            }

            await github.rest.issues.addLabels({
              ...context.repo,
              issue_number: pr.number,
              labels: missing,
            });
            core.info(`added: ${missing.join(", ")}`);