from: github.com/remko/age-plugin-se

Sources/Stream.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+/// Abstraction of a line-based communication stream
+protocol Stream {
+  func readLine() -> String?
+  func writeLine(_: String)
+}
+
+class StandardIOStream: Stream {
+  func readLine() -> String? {
+    return Swift.readLine(strippingNewline: true)
+  }
+
+  func writeLine(_ line: String) {
+    FileHandle.standardOutput.write(line.data(using: .utf8)!)
+    FileHandle.standardOutput.write(Data([0xa]))
+    fflush(stdout)
+  }
+}