Merge pull request #9 from g-Off/add-missing-duplicates

remove references that are duplicates and are not referenced by build files

.gitignore

@@ -36,6 +36,7 @@ playground.xcworkspace
 # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
 # Packages/
 .build/
+.swiftpm
 
 # CocoaPods
 #

Sources/XcodeProject/Objects+Extensions/PBXGroup+FolderSync.swift

@@ -42,6 +42,7 @@ public extension PBXGroup {
 	func sync(recursive: Bool, target: PBXTarget? = nil) {
 		let target = target ?? parentProject?.targets.first
 		removeDuplicateFiles(recursive: recursive)
+		removeDuplicateFilesByPath(recursive: recursive)
 		addMissingFiles(recursive: recursive, target: target)
 		removeMissingFiles(recursive: recursive)
 	}
@@ -65,6 +66,27 @@ public extension PBXGroup {
 		}
 	}
 
+	private func removeDuplicateFilesByPath(recursive: Bool) {
+		var itemsByPath: [String: [PBXReference]] = [:]
+		for i in 0..<children.count {
+			let child = children[i]
+			if let path = child.path {
+				itemsByPath[path, default: []].append(child)
+			}
+			if recursive, let group = child as? PBXGroup {
+				group.removeDuplicateFilesByPath(recursive: recursive)
+			}
+		}
+		let duplicatePathItems = itemsByPath.filter { $0.value.count > 1 }
+		duplicatePathItems.forEach { (path, references) in
+			references.forEach { reference in
+				if reference.buildFiles.isEmpty {
+					remove(child: reference)
+				}
+			}
+		}
+	}
+
 	private func removeMissingFiles(recursive: Bool) {
 		var newChildren: [PBXReference] = []
 		children.forEach {
@@ -103,6 +125,7 @@ public extension PBXGroup {
 
 	private func addMissingFiles(recursive: Bool, target: PBXTarget?) {
 		guard let url = self.url else { return }
+
 		let childPathItems: [(String, PBXReference)] = children.compactMap {
 			guard let childURL = $0.url else { return nil }
 			return (childURL.path, $0)

Sources/XcodeProject/Objects/PBXGlobalID.swift

@@ -7,7 +7,10 @@
 
 import Foundation
 
-public struct PBXGlobalID: RawRepresentable {
+public struct PBXGlobalID: RawRepresentable, CustomStringConvertible, CustomDebugStringConvertible {
+	public var description: String { return rawValue }
+	public var debugDescription: String { return rawValue }
+
 	public let rawValue: String
 
 	public init(rawValue: String) {