added hooks for common directories - Documents, Caches and Application Support

Sources/Path+CommonDirectories.swift

@@ -0,0 +1,24 @@
+import Foundation
+
+extension Path {
+    // helper to allow search path and domain mask to be passed in
+    private static func pathFor(searchPathDirectory path: FileManager.SearchPathDirectory, domain: FileManager.SearchPathDomainMask = .userDomainMask) -> Path? {
+        guard let pathString = FileManager.default.urls(for: path, in: .userDomainMask).last?.relativeString else {
+            return nil
+        }
+
+        return Path(string: pathString)
+    }
+
+    public static var documents: Path? {
+        return pathFor(searchPathDirectory: .documentDirectory)
+    }
+
+    public static var caches: Path? {
+        return pathFor(searchPathDirectory: .cachesDirectory)
+    }
+
+    public static var applicationSupport: Path? {
+        return pathFor(searchPathDirectory: .applicationSupportDirectory)
+    }
+}