From f478cb6a2674564bf883f378be91e4081a8a88f4 Mon Sep 17 00:00:00 2001
From: Christopher Fuller <christopher.fuller@gotinder.com>
Date: Mon, 22 Jan 2024 11:08:06 -0800
Subject: [PATCH] Limit unsafe flags via environment (#295)

---
 .github/workflows/pages.yml |  1 +
 .github/workflows/swift.yml |  1 +
 Package.swift               | 19 +++++++++++++------
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index ba953359..ae320897 100644
--- a/.github/workflows/pages.yml
+++ b/.github/workflows/pages.yml
@@ -6,6 +6,7 @@ on:
 
 env:
   DEVELOPER_DIR: /Applications/Xcode_15.0.app/Contents/Developer
+  SWIFT_EMIT_EXTENSION_BLOCK_SYMBOLS: true
 
 jobs:
   pages:
diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index 2c620774..daa1484a 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -8,6 +8,7 @@ on:
 
 env:
   DEVELOPER_DIR: /Applications/Xcode_15.0.app/Contents/Developer
+  SWIFT_STRICT_CONCURRENCY: complete
 
 jobs:
   swift:
diff --git a/Package.swift b/Package.swift
index 2bd17e79..223bf2d9 100644
--- a/Package.swift
+++ b/Package.swift
@@ -30,12 +30,7 @@ let package = Package(
     targets: [
         .target(
             name: "Layout",
-            swiftSettings: [
-                .unsafeFlags([
-                    "-strict-concurrency=complete",
-                    "-emit-extension-block-symbols"
-                ]),
-            ],
+            swiftSettings: .swiftSettings,
             plugins: [
                 .plugin(name: SwiftLint.plugin),
             ]),
@@ -66,3 +61,15 @@ let package = Package(
             checksum: "963121d6babf2bf5fd66a21ac9297e86d855cbc9d28322790646b88dceca00f1"),
     ]
 )
+
+extension Array where Element == SwiftSetting {
+
+    static var swiftSettings: [SwiftSetting] {
+        if let value: String = Context.environment["SWIFT_STRICT_CONCURRENCY"] {
+            return [.unsafeFlags(["-strict-concurrency=\(value)"])]
+        } else if Context.environment["SWIFT_EMIT_EXTENSION_BLOCK_SYMBOLS"] != nil {
+            return [.unsafeFlags(["-emit-extension-block-symbols"])]
+        }
+        return []
+    }
+}