Simplify REPL displayPrompt

Now that we insert \r into the stream and aren't switching back and forth
between termios modes, not need to worry about when to display the prompt.

lib/repl.js

@@ -79,8 +79,6 @@ function REPLServer(prompt, stream) {
   rli.addListener('line', function (cmd) {
     cmd = trimWhitespace(cmd);
 
-    var flushed = true;
-
     // Check to see if a REPL keyword was used. If it returns true,
     // display next prompt and return.
     if (cmd && cmd.charAt(0) === '.') {
@@ -100,7 +98,7 @@ function REPLServer(prompt, stream) {
         var ret = evalcx(self.buffered_cmd, context, "repl");
         if (ret !== undefined) {
           context._ = ret;
-          flushed = self.stream.write(exports.writer(ret) + "\n");
+          self.stream.write(exports.writer(ret) + "\n");
         }
 
         self.buffered_cmd = '';
@@ -113,28 +111,14 @@ function REPLServer(prompt, stream) {
     } catch (e) {
       // On error: Print the error and clear the buffer
       if (e.stack) {
-        flushed = self.stream.write(e.stack + "\n");
+        self.stream.write(e.stack + "\n");
       } else {
-        flushed = self.stream.write(e.toString() + "\n");
+        self.stream.write(e.toString() + "\n");
       }
       self.buffered_cmd = '';
     }
 
-    // need to make sure the buffer is flushed before displaying the prompt
+    self.displayPrompt();
-    // again. This is really ugly. Need to have callbacks from
-    // net.Stream.write()
-    if (flushed) {
-      self.displayPrompt();
-    } else {
-      self.displayPromptOnDrain = true;
-    }
-  });
-
-  self.stream.addListener('drain', function () {
-    if (self.displayPromptOnDrain) {
-      self.displayPrompt();
-      self.displayPromptOnDrain = false;
-    }
   });
 
   rli.addListener('close', function () {