Additional improvement to CommonJS Modules support

Now implements (and mostly follows) requirements of Modules/1.1 spec
  implementes only the required "secure sandbox" subset of the spec
  `module` free variable changed from the `moduleInfo` to an id container
  `require` free variable given a "main" property
  boot module scope closed and exported
    this also changes the interface between boot and bootprefix slightly
    (should now be able to create multiple TW instances under node)
 BREAKING CHANGES:
  The tiddlywiki module itself now exports a single constructor function
  Modules which depended on `module` referring to `moduleInfo` will break
  Modules which don't conform to Modules/1.1 will break
    (by attempting to modify require.main or module.id)

boot/boot.js

@@ -20,23 +20,16 @@ The module definitions on the browser look like this:
 In practice, each module is wrapped in a separate script block.
 
 \*/
-(function() {
+
+var _boot = (function($tw) {
 
 /*jslint node: true, browser: true */
 /*global modules: false, $tw: false */
 "use strict";
 
-/////////////////////////// Setting up $tw
-
-// Set up $tw global for the server (set up for browser is in bootprefix.js)
-if(typeof(window) === "undefined") {
-	global.$tw = global.$tw || {}; // No `browser` member for the server
-	exports.$tw = $tw; // Export $tw for when boot.js is required directly in node.js
-}
-
-// Include bootprefix if we're on the server
-if(!$tw.browser) {
-	require("./bootprefix.js");
+// Include bootprefix if we're not given module data
+if(!$tw) {
+	$tw = require("./bootprefix.js").bootprefix();
 }
 
 $tw.utils = $tw.utils || {};
@@ -548,7 +541,8 @@ $tw.modules.execute = function(moduleName,moduleRoot) {
 		tiddler = $tw.wiki.getTiddler(name) || $tw.wiki.getTiddler(name + ".js") || $tw.wiki.getTiddler(moduleName) || $tw.wiki.getTiddler(moduleName + ".js") ,
 		_exports = {},
 		sandbox = {
-			module: moduleInfo,
+			module: {},
+			//moduleInfo: moduleInfo,
 			exports: _exports,
 			console: console,
 			setInterval: setInterval,
@@ -560,10 +554,30 @@ $tw.modules.execute = function(moduleName,moduleRoot) {
 				return $tw.modules.execute(title, name);
 			}
 		};
+
+	Object.defineProperty(sandbox.module, "id", {
+		value: name,
+		writable: false,
+		enumerable: true,
+		configurable: false
+	});
+
 	if(!$tw.browser) {
 		$tw.utils.extend(sandbox,{
 			process: process
 		});
+	} else {
+		/*
+		CommonJS optional require.main property:
+		 In a browser we offer a fake main module which points back to the boot function
+		 (Theoretically, this may allow TW to eventually load itself as a module in the browser)
+		*/
+		Object.defineProperty(sandbox.require, "main", {
+			value: (typeof(require) !== "undefined") ? require.main : {TiddlyWiki: _boot},
+			writable: false,
+			enumerable: true,
+			configurable: false
+		});
 	}
 	if(!moduleInfo) {
 		// We could not find the module on this path
@@ -1417,4 +1431,15 @@ if($tw.browser) {
 	$tw.boot.boot();
 }
 
-})();
+return $tw;
+
+});
+
+if(typeof(exports) !== "undefined") {
+	exports.TiddlyWiki = _boot;
+} else {
+	_boot(window.$tw);
+}
+
+
+

boot/bootprefix.js

@@ -12,12 +12,11 @@ See Boot.js for further details of the boot process.
 
 \*/
 
-// Set up $tw global for the browser
-if(typeof(window) === "undefined") {
-	global.$tw = global.$tw || {}; // No `browser` member for the server
-} else {
-	window.$tw = window.$tw || {browser: {}};
-}
+var _bootprefix = (function($tw) {
+
+"use strict";
+
+$tw = $tw || {browser: typeof(window) !== "undefined" ? {} : null};
 
 /*
 Information about each module is kept in an object with these members:
@@ -81,3 +80,18 @@ Convenience function for pushing a tiddler onto the preloading array
 $tw.preloadTiddler = function(fields) {
 	$tw.preloadTiddlers.push(fields);
 };
+
+return $tw
+
+});
+
+if(typeof(exports) === "undefined") {
+	// Set up $tw global for the browser
+	window.$tw = _bootprefix();
+} else {
+	// Export functionality as a module
+	exports.bootprefix = _bootprefix;
+}
+
+
+

tiddlywiki.js

@@ -4,7 +4,7 @@
 This is invoked as a shell script by NPM when the `tiddlywiki` command is typed
 */
 
-var $tw = require("./boot/boot.js").$tw;
+var $tw = require("./boot/boot.js").TiddlyWiki();
 
 // Pass the command line arguments to the boot kernel
 $tw.boot.argv = Array.prototype.slice.call(process.argv,2);