FileManager Entry Points for ObjC Directory Enumeration (#1047)

* (139469462) ObjC API for directory search paths should use Swift implementation

* Fix trash directory bug

Author: jmschonfeld

Sources/FoundationEssentials/FileManager/SearchPaths/FileManager+DarwinSearchPaths.swift

@@ -57,9 +57,9 @@ struct _DarwinSearchPathsSequence: Sequence {
             switch directory {
             #if os(macOS) && FOUNDATION_FRAMEWORK
             case .trashDirectory:
-                state = .special(domainMask.union([.userDomainMask, .localDomainMask]))
+                state = .special(domainMask.intersection([.userDomainMask, .localDomainMask]))
             case ._homeDirectory, .applicationScriptsDirectory:
-                state = .special(domainMask.union(.userDomainMask))
+                state = .special(domainMask.intersection(.userDomainMask))
             #endif
 
             default:
@@ -155,6 +155,11 @@ struct _DarwinSearchPathsSequence: Sequence {
 }
 
 #if os(macOS) && FOUNDATION_FRAMEWORK
+@_cdecl("_NSRealHomeDirectory")
+internal func _NSRealHomeDirectory() -> String {
+    "~".replacingTildeWithRealHomeDirectory
+}
+
 extension String {
     internal var replacingTildeWithRealHomeDirectory: String {
         guard self == "~" || self.hasPrefix("~/") else {

Sources/FoundationEssentials/FileManager/SearchPaths/FileManager+SearchPaths.swift

@@ -57,6 +57,13 @@ extension FileManager.SearchPathDomainMask {
     }
 }
 
+#if FOUNDATION_FRAMEWORK
+@_cdecl("_NSSearchPathsForDirectoryInDomain")
+func _NSSearchPaths(for directory: FileManager.SearchPathDirectory, in domain: FileManager.SearchPathDomainMask, expandTilde: Bool) -> [String] {
+    _SearchPathURLs(for: directory, in: domain, expandTilde: expandTilde).map(\.path)
+}
+#endif
+
 func _SearchPathURLs(for directory: FileManager.SearchPathDirectory, in domain: FileManager.SearchPathDomainMask, expandTilde: Bool) -> some Sequence<URL> {
     #if canImport(Darwin)
     let basic = _DarwinSearchPathsSequence(directory: directory, domainMask: domain.intersection(.valid)).lazy.map {

Tests/FoundationEssentialsTests/FileManager/FileManagerTests.swift

@@ -840,6 +840,13 @@ final class FileManagerTests : XCTestCase {
             }
         }
     }
+    
+    func testSpecialTrashDirectoryDuplication() throws {
+        try FileManagerPlayground {}.test { fileManager in
+            let trashURLs = fileManager.urls(for: .trashDirectory, in: .userDomainMask)
+            XCTAssertEqual(trashURLs.count, 1, "There should only be one trash directory for the user domain, found \(trashURLs)")
+        }
+    }
     #endif
 
     func testSearchPaths() throws {