Add useGlobal flag for standard node repl

doc/api/repl.markdown

@@ -27,12 +27,15 @@ For example, you could add this to your bashrc file:
     alias node="env NODE_NO_READLINE=1 rlwrap node"
 
 
-### repl.start(prompt='> ', stream=process.stdin, eval=eval)
+### repl.start(prompt='> ', stream=process.stdin, eval=eval, useGlobal=false)
 
 Starts a REPL with `prompt` as the prompt and `stream` for all I/O.  `prompt`
 is optional and defaults to `> `.  `stream` is optional and defaults to
 `process.stdin`. `eval` is optional too and defaults to async wrapper for `eval`.
 
+If `useGlobal` is set to true, then the repl will use the global object,
+instead of running scripts in a separate context.
+
 You can use your own `eval` function if it has following signature:
 
     function eval(cmd, callback) {

lib/repl.js

@@ -68,12 +68,19 @@ module.paths = require('module')._nodeModulePaths(module.filename);
 exports.writer = util.inspect;
 
 
-function REPLServer(prompt, stream, eval) {
+function REPLServer(prompt, stream, eval, useGlobal) {
   var self = this;
 
+  self.useGlobal = useGlobal;
+
   self.eval = eval || function(code, context, file, cb) {
+    var err, result;
     try {
-      var err, result = vm.runInContext(code, context, file);
+      if (useGlobal) {
+        result = vm.runInThisContext(code, file);
+      } else {
+        result = vm.runInContext(code, context, file);
+      }
     } catch (e) {
       err = e;
     }
@@ -238,17 +245,21 @@ exports.REPLServer = REPLServer;
 
 // prompt is a string to print on each line for the prompt,
 // source is a stream to use for I/O, defaulting to stdin/stdout.
-exports.start = function(prompt, source, eval) {
-  var repl = new REPLServer(prompt, source, eval);
+exports.start = function(prompt, source, eval, useGlobal) {
+  var repl = new REPLServer(prompt, source, eval, useGlobal);
   if (!exports.repl) exports.repl = repl;
   return repl;
 };
 
 
 REPLServer.prototype.createContext = function() {
-  var context = vm.createContext();
+  if (!this.useGlobal) {
+    var context = vm.createContext();
+    for (var i in global) context[i] = global[i];
+  } else {
+    var context = global;
+  }
 
-  for (var i in global) context[i] = global[i];
   context.module = module;
   context.require = require;
   context.global = context;
@@ -413,7 +424,9 @@ REPLServer.prototype.complete = function(line, callback) {
       if (!expr) {
         // If context is instance of vm.ScriptContext
         // Get global vars synchronously
-        if (this.context.constructor.name === 'Context') {
+        if (this.useGlobal ||
+            this.context.constructor &&
+            this.context.constructor.name === 'Context') {
           completionGroups.push(Object.getOwnPropertyNames(this.context));
           addStandardGlobals();
           completionGroupsLoaded();

src/node.js

@@ -107,7 +107,7 @@
       // If stdin is a TTY.
       if (NativeModule.require('tty').isatty(0)) {
         // REPL
-        Module.requireRepl().start();
+        var repl = Module.requireRepl().start('> ', null, null, true);
 
       } else {
         // Read all of stdin - execute it.