[readline, repl] Fix completion grouping, fix parens eval results

handling

lib/readline.js

@@ -271,7 +271,7 @@ Interface.prototype._tabComplete = function() {
         var width = completions.reduce(function(a, b) {
           return a.length > b.length ? a : b;
         }).length + 2;  // 2 space padding
-        var maxColumns = Math.floor(this.columns / width) || 1;
+        var maxColumns = Math.floor(self.columns / width) || 1;
 
         function handleGroup(group) {
           if (group.length == 0) {

lib/repl.js

@@ -64,10 +64,10 @@ module.paths = require('module')._nodeModulePaths(module.filename);
 exports.writer = util.inspect;
 
 
-function REPLServer(prompt, stream, options) {
+function REPLServer(prompt, stream) {
   var self = this;
 
-  self.eval = options && options.eval || function(code, context, file, cb) {
+  self.eval = function(code, context, file, cb) {
     try {
       var err, result = vm.runInContext(code, context, file);
     } catch (e) {
@@ -186,15 +186,17 @@ function REPLServer(prompt, stream, options) {
 
       // Now as statement without parens.
       function tryExpr(ret) {
-        self.eval(self.bufferedCommand, self.context,
-                  'repl', function(e, ret) {
 
-          if (ret !== undefined) {
-            self.context._ = ret;
-            self.outputStream.write(exports.writer(ret) + '\n');
-          }
+        self.bufferedCommand = '';
+
+        if (ret !== undefined) {
+          self.context._ = ret;
+          self.outputStream.write(exports.writer(ret) + '\n');
+          return finish(null);
+        }
 
-          self.bufferedCommand = '';
+        self.eval(self.bufferedCommand, self.context,
+                  'repl', function(e, ret) {
 
           if (e) {
             // instanceof doesn't work across context switches.
@@ -467,13 +469,16 @@ REPLServer.prototype.complete = function(line, callback) {
               filter = expr + '.' + filter;
             }
           }
+
+          finish();
         });
+        return;
       }
     }
   }
 
   // If reach this point - work like sync
-  finish(null, ret);
+  finish(null);
   function finish(err, ret) {
     if (err) throw err;