From 939a6922e94c50baf1a7c7f892a6daa80e85216f Mon Sep 17 00:00:00 2001
From: Jan Krivanek <jankrivanek@microsoft.com>
Date: Wed, 6 May 2026 18:31:43 +0200
Subject: [PATCH] Add PR platform labeling

---
 .github/workflows/platform-label.yml | 61 ++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 .github/workflows/platform-label.yml

diff --git a/.github/workflows/platform-label.yml b/.github/workflows/platform-label.yml
new file mode 100644
index 000000000000..ab5ce81f271c
--- /dev/null
+++ b/.github/workflows/platform-label.yml
@@ -0,0 +1,61 @@
+# Auto-label PRs with platform/android, platform/ios, platform/macos, and/or platform/windows
+# based on changed file paths. Applies all matching labels.
+# If no platform-specific files are detected, no labels are applied.
+
+name: Platform Label
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Detect platform from changed files
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          PR_NUMBER="${{ github.event.pull_request.number }}"
+
+          FILES=$(gh api "repos/${{ github.repository }}/pulls/${PR_NUMBER}/files" --paginate --jq '.[].filename' 2>/dev/null || true)
+          if [ -z "${FILES}" ]; then
+            echo "No files found or API error — skipping."
+            exit 0
+          fi
+
+          HAS_ANDROID=$(echo "${FILES}" | grep -ciE '(/Android/|\.android\.cs)' || true)
+          HAS_IOS=$(echo "${FILES}" | grep -ciE '(/iOS/|\.ios\.cs)' || true)
+          HAS_CATALYST=$(echo "${FILES}" | grep -ciE '(/MacCatalyst/|\.maccatalyst\.cs)' || true)
+          HAS_WINDOWS=$(echo "${FILES}" | grep -ciE '(/Windows/|\.windows\.cs)' || true)
+
+          echo "Platform file counts — Android: ${HAS_ANDROID}, iOS: ${HAS_IOS}, MacCatalyst: ${HAS_CATALYST}, Windows: ${HAS_WINDOWS}"
+
+          LABELS=""
+          if [ "${HAS_ANDROID}" -gt 0 ]; then
+            LABELS="${LABELS} platform/android"
+          fi
+          if [ "${HAS_IOS}" -gt 0 ]; then
+            LABELS="${LABELS} platform/ios"
+          fi
+          if [ "${HAS_CATALYST}" -gt 0 ]; then
+            LABELS="${LABELS} platform/macos"
+          fi
+          if [ "${HAS_WINDOWS}" -gt 0 ]; then
+            LABELS="${LABELS} platform/windows"
+          fi
+
+          LABELS=$(echo "${LABELS}" | xargs)
+          if [ -z "${LABELS}" ]; then
+            echo "No platform-specific files detected — no labels applied."
+            exit 0
+          fi
+
+          # Convert space-separated to comma-separated for gh cli
+          LABEL_CSV=$(echo "${LABELS}" | tr ' ' ',')
+          echo "Applying labels: ${LABELS}"
+          gh pr edit "${PR_NUMBER}" --repo "${{ github.repository }}" --add-label "${LABEL_CSV}"