Preserve nested target attribute dictionaries

CHANGELOG.md

@@ -8,6 +8,9 @@
 ### Changed
 - Targets in the generated project now follow the declaration order from the source spec (Xcode sidebar, `xcodebuild -list` output). Previously they were always sorted alphabetically. Applies to both YAML and JSON specs. Declaration order is now also preserved for targets whose `platform`/`name` come from a target template and for targets whose key is a `${VARIABLE}`. #1619 @mirkokg
 
+### Fixed
+- Preserve nested target attributes such as `SystemCapabilities` as native PBX dictionaries #1643 @TblKBA
+
 ### Internal
 - Update to XcodeProj 9.14.0 #1629 @philprime
 

Sources/ProjectSpec/Settings.swift

@@ -144,6 +144,10 @@ extension ProjectAttribute {
             self = .array(array)
         } else if let object = value as? PBXObject {
             self = .targetReference(object)
+        } else if let dictionary = value as? [String: [String: Any]] {
+            self = .attributeDictionary(
+                dictionary.mapValues { $0.mapValues { ProjectAttribute(any: $0) } }
+            )
         } else {
             self = .string("\(value)")
         }

Tests/XcodeGenKitTests/PBXProjGeneratorTests.swift

@@ -471,6 +471,29 @@ class PBXProjGeneratorTests: XCTestCase {
             XCTAssertEqual(pbxProject.attributes[lastUpgradeKey]?.stringValue, lastUpgradeValue)
         }
     }
+
+    func testNestedTargetAttributesAreGeneratedAsDictionaries() throws {
+        let target = Target(
+            name: "App",
+            type: .application,
+            platform: .iOS,
+            attributes: [
+                "SystemCapabilities": [
+                    "com.apple.HealthKit": ["enabled": 1],
+                ],
+            ]
+        )
+        let pbxProj = try Project(name: "Test", targets: [target]).generatePbxProj()
+        let pbxProject = try XCTUnwrap(pbxProj.projects.first)
+        let pbxTarget = try XCTUnwrap(pbxProject.targets.first)
+
+        XCTAssertEqual(
+            pbxProject.targetAttributes[pbxTarget]?["SystemCapabilities"],
+            .attributeDictionary([
+                "com.apple.HealthKit": ["enabled": .string("1")],
+            ])
+        )
+    }
 
     func testDefaultLastUpgradeCheckWhenUserDidNotSpecifyValue() throws {
         let lastUpgradeKey = "LastUpgradeCheck"