FoundationEssentials: add type to the file attributes on Windows

Get the file type using the Win32 APIs and wire that into the attribute
dictionary.

Author: compnerd

Sources/FoundationEssentials/FileManager/FileManager+Files.swift

@@ -531,20 +531,38 @@ extension _FileManagerImpl {
                 throw CocoaError.errorWithFilePath(path, win32: GetLastError(), reading: true)
             }
 
+            let hFile = CreateFileW(pwszPath, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nil, OPEN_EXISTING, 0, nil)
+            if hFile == INVALID_HANDLE_VALUE {
+                throw CocoaError.errorWithFilePath(path, win32: GetLastError(), reading: true)
+            }
+            defer { CloseHandle(hFile) }
+
+            let dwFileType = GetFileType(hFile)
+            let fatType: FileAttributeType = switch (dwFileType) {
+                case FILE_TYPE_CHAR: FileAttributeType.typeCharacterSpecial
+                case FILE_TYPE_DISK:
+                    faAttributes.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY == FILE_ATTRIBUTE_DIRECTORY
+                            ? FileAttributeType.typeDirectory
+                            : FileAttributeType.typeRegular
+                case FILE_TYPE_PIPE: FileAttributeType.typeSocket
+                case FILE_TYPE_UNKNOWN: FileAttributeType.typeUnknown
+                default: FileAttributeType.typeUnknown
+            }
+
             let size: UInt64 = (UInt64(faAttributes.nFileSizeHigh) << 32) | UInt64(faAttributes.nFileSizeLow)
             let creation: Date = Date(timeIntervalSince1970: faAttributes.ftCreationTime.timeIntervalSince1970)
             let modification: Date = Date(timeIntervalSince1970: faAttributes.ftLastWriteTime.timeIntervalSince1970)
             return [
                 .size: _writeFileAttributePrimitive(size, as: UInt.self),
                 .modificationDate: modification,
                 .creationDate: creation,
+                .type: fatType,
 
                 // TODO(compnerd) support these attributes, remapping the Windows semantics...
                 // .posixPermissions: ...,
                 // .referenceCount: ...,
                 // .systemNumber: ...,
                 // .systemFileNumber: ...,
-                // .type: ...,
                 // .ownerAccountID: ...,
                 // .groupownerAccountID: ...,
                 // .ownerAccountName: ...,

Tests/FoundationEssentialsTests/FileManager/FileManagerTests.swift

@@ -635,6 +635,7 @@ final class FileManagerTests : XCTestCase {
             File("foo", attributes: [.posixPermissions : UInt16(0o644)])
         }.test {
             let attributes = try $0.attributesOfItem(atPath: "foo")
+#if !os(Windows)
             // Ensure the unconventional UInt16 was accepted as input
             XCTAssertEqual(attributes[.posixPermissions] as? UInt, 0o644)
             #if FOUNDATION_FRAMEWORK
@@ -643,6 +644,7 @@ final class FileManagerTests : XCTestCase {
             // Ensure that the file type can be converted to a String when it is an ObjC enum
             XCTAssertEqual(attributes[.type] as? String, FileAttributeType.typeRegular.rawValue)
             #endif
+#endif
             // Ensure that the file type can be converted to a FileAttributeType when it is an ObjC enum and in swift-foundation
             XCTAssertEqual(attributes[.type] as? FileAttributeType, .typeRegular)