Merge pull request #865 from compnerd/paths

TestUtilities: add path utilities

Author: compnerd

Tests/TestUtilities/PathExtensions.swift

@@ -0,0 +1,30 @@
+//===---------- PathExtensions.swift - Driver Testing Extensions ----------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2020 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import Foundation
+import TSCBasic
+
+extension String {
+  public func escaped() -> Self {
+#if os(Windows)
+    return self.replacingOccurrences(of: "\\", with: "\\\\")
+#else
+    return self
+#endif
+  }
+
+  public func nativePathString() -> Self {
+    return URL(fileURLWithPath: self).withUnsafeFileSystemRepresentation {
+      String(cString: $0!)
+    }
+  }
+}