From 4594d961135f4b81f14c98f4719b5992ccb6d53b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20Bj=C3=B6rkert?= <jonas@bjorkert.se>
Date: Thu, 9 Apr 2026 21:10:21 +0200
Subject: [PATCH 1/2] Add SwiftFormat lint check on pull requests
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Runs swiftformat --lint in a Linux container on every PR using the
same BuildTools pin (SwiftFormat 0.56.1) and flags as the local
Scripts/swiftformat.sh, so CI stays in sync with `swift run swiftformat`
on a developer machine.

Fails the check on any violation without rewriting files — contributors
fix formatting themselves and push, rather than having CI commit back
over their branch.

BuildTools/.build is cached by Package.resolved hash to keep subsequent
runs fast.
---
 .github/workflows/lint.yml | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 .github/workflows/lint.yml

diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 000000000..7af12d9ca
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,33 @@
+name: Lint
+run-name: Lint (${{ github.head_ref || github.ref_name }})
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  swiftformat:
+    name: SwiftFormat
+    runs-on: ubuntu-latest
+    container: swift:6.0
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
+      - name: Cache SwiftFormat build
+        uses: actions/cache@v4
+        with:
+          path: BuildTools/.build
+          key: ${{ runner.os }}-swiftformat-${{ hashFiles('BuildTools/Package.resolved', 'BuildTools/Package.swift') }}
+          restore-keys: |
+            ${{ runner.os }}-swiftformat-
+
+      - name: SwiftFormat --lint
+        run: |
+          swift run -c release --package-path BuildTools swiftformat . \
+            --lint \
+            --header "LoopFollow\n{file}" \
+            --exclude Pods,Generated,R.generated.swift,fastlane/swift,Dependencies,dexcom-share-client-swift

From 31e6b75e497f92bd711832d85593717ac3a1add2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20Bj=C3=B6rkert?= <jonas@bjorkert.se>
Date: Thu, 9 Apr 2026 21:42:40 +0200
Subject: [PATCH 2/2] Cancel in-flight lint runs when a newer push lands
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Adds a concurrency group so rapid successive pushes to a PR branch
don't stack up multiple Lint runs — the in-progress run is cancelled
as soon as a newer commit arrives.
---
 .github/workflows/lint.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 7af12d9ca..68aa860f6 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -5,6 +5,10 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: lint-${{ github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read