readline: fix `line` event, if input emit 'end'

If an input stream would emit `end` event, like
`fs.createReadStream`, then readline need to get the last line
correctly even though that line isnt ended with `\n`.

lib/readline.js

@@ -91,6 +91,9 @@ function Interface(input, output, completer, terminal) {
   }
 
   function onend() {
+    if (util.isString(self._line_buffer) && self._line_buffer.length > 0) {
+      self.emit('line', self._line_buffer);
+    }
     self.close();
   }
 
@@ -118,6 +121,11 @@ function Interface(input, output, completer, terminal) {
 
     // input usually refers to stdin
     input.on('keypress', onkeypress);
+    input.on('end', function inputEnd() {
+      if (util.isString(self.line) && self.line.length > 0)
+        self.emit('line', self.line);
+      self.close();
+    });
 
     // Current line
     this.line = '';

test/simple/test-readline-interface.js

@@ -113,6 +113,27 @@ FakeInput.prototype.end = function() {};
   assert.equal(callCount, expectedLines.length - 1);
   rli.close();
 
+  // sending multiple newlines at once that does not end with a new(empty) 
+  // line and a `end` event
+  fi = new FakeInput();
+  rli = new readline.Interface({ input: fi, output: fi, terminal: terminal });
+  expectedLines = ['foo', 'bar', 'baz', ''];
+  callCount = 0;
+  rli.on('line', function(line) {
+    assert.equal(line, expectedLines[callCount]);
+    callCount++;
+  });
+  rli.on('close', function() {
+    callCount++;
+  })
+  fi.emit('data', expectedLines.join('\n'));
+  fi.emit('end');
+  assert.equal(callCount, expectedLines.length);
+  rli.close();
+
+  // sending multiple newlines at once that does not end with a new line
+  // and a `end` event(last line is)
+
   // \r\n should emit one line event, not two
   fi = new FakeInput();
   rli = new readline.Interface({ input: fi, output: fi, terminal: terminal });
@@ -214,6 +235,5 @@ FakeInput.prototype.end = function() {};
   assert.equal(readline.getStringWidth('\u001b[31m\u001b[39m'), 0);
   assert.equal(readline.getStringWidth('> '), 2);
 
-  assert.deepEqual(fi.listeners('end'), []);
   assert.deepEqual(fi.listeners(terminal ? 'keypress' : 'data'), []);
 });

test/simple/test-readline-set-raw-mode.js

@@ -49,7 +49,7 @@ var rli = readline.createInterface({
   output: stream,
   terminal: true
 });
-assert(rli.terminal)
+assert(rli.terminal);
 assert(rawModeCalled);
 assert(resumeCalled);
 assert(!pauseCalled);
@@ -85,7 +85,6 @@ assert(rawModeCalled);
 assert(!resumeCalled);
 assert(pauseCalled);
 
-assert.deepEqual(stream.listeners('end'), []);
 assert.deepEqual(stream.listeners('keypress'), []);
 // one data listener for the keypress events.
 assert.equal(stream.listeners('data').length, 1);