Merge pull request #23 from ergebnis/feature/triage

Enhancement: Add triage workflow

Author: ergebnis-bot

.github/CONTRIBUTING.md

@@ -5,6 +5,7 @@ We are using [GitHub Actions](https://github.com/features/actions) as a continuo
 For details, take a look at the following workflow configuration files:
 
 - [`workflows/integrate.yaml`](workflows/integrate.yaml)
+- [`workflows/triage.yaml`](workflows/triage.yaml)
 
 ## Coding Standards
 

.github/workflows/triage.yaml

@@ -0,0 +1,45 @@
+# https://docs.github.com/en/actions
+
+name: "Triage"
+
+on: # yamllint disable-line rule:truthy
+  pull_request:
+    types:
+      - "opened"
+
+jobs:
+  label:
+    name: "Label"
+
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Add labels based on branch name"
+        uses: "actions/github-script@v2.0.0"
+        with:
+          github-token: "${{ secrets.ERGEBNIS_BOT_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.issues.addLabels({
+                issue_number: pullRequest.number,
+                labels: [
+                  label
+                ],
+                owner: repository.owner,
+                repo: repository.repo,
+              });
+            }