Merge pull request JohnSundell#16 from JohnSundell/item-modified-date

FileSystem.Item: Add modifiedDate property

Sources/Files.swift

@@ -161,7 +161,10 @@ public class FileSystem {
 
             return components.last
         }
-
+
+        /// The date when the item was last modified
+        public private(set) lazy var modificationDate: Date = self.loadModificationDate()
+
         /// The folder that the item is contained in, or `nil` if this item is the root folder of the file system
         public var parent: Folder? {
             return fileManager.parentPath(for: path).flatMap { parentPath in
@@ -853,6 +856,11 @@ private extension FileSystem.Item {
             }
         }
     }
+
+    func loadModificationDate() -> Date {
+        let attributes = try! fileManager.attributesOfItem(atPath: path)
+        return attributes[FileAttributeKey.modificationDate] as! Date
+    }
 }
 
 private extension FileManager {

Tests/FilesTests/FilesTests.swift

@@ -349,6 +349,16 @@ class FilesTests: XCTestCase {
             XCTAssertEqual(folder.files.last?.name, "C")
         }
     }
+
+    func testModificationDate() {
+        performTest {
+            let subfolder = try folder.createSubfolder(named: "Folder")
+            XCTAssertTrue(Calendar.current.isDateInToday(subfolder.modificationDate))
+
+            let file = try folder.createFile(named: "File")
+            XCTAssertTrue(Calendar.current.isDateInToday(file.modificationDate))
+        }
+    }
 
     func testParent() {
         performTest {