Bootstrap.js: specific support of patchRequire for SlimerJS

SlimerJS provides an API to indicate paths where modules
can be found: require.paths (CommonJS specification).
So patchRequire is not needed for SlimerJS.

@@ -171,6 +171,8 @@ CasperError.prototype = Object.getPrototypeOf(new Error());
      *
      *     var require = patchRequire(require);
      *     var utils = require('utils');
+     *
+     * Useless for SlimerJS
      */
     function patchRequire(require) {
         if (require.patched) {
@@ -290,10 +292,22 @@ CasperError.prototype = Object.getPrototypeOf(new Error());
         };
     })(phantom.casperPath);
 
+    if ("slimer" in global) {
+        // for SlimerJS, use the standard API to declare directories
+        // where to search modules
+        require.paths.push(fs.pathJoin(phantom.casperPath, 'modules'));
+        require.paths.push(fs.workingDirectory);
+
+        // declare a dummy patchRequire function
+        require.globals.patchRequire = global.patchRequire
+                                     = function(req) { return req;}
+    }
+    else {
         // patch require
         global.__require = require;
         global.patchRequire = patchRequire; // must be called in every casperjs module as of 1.1
         global.require = patchRequire(global.require);
+    }
 
     // casper cli args
     phantom.casperArgs = require('cli').parse(phantomArgs);
@@ -302,6 +316,13 @@ CasperError.prototype = Object.getPrototypeOf(new Error());
         initCasperCli(phantom.casperArgs);
     }
 
+    if ("slimer" in global && phantom.casperScriptBaseDir) {
+        // initCasperCli has set casperScriptBaseDir
+        // use it instead of fs.workingDirectory
+        require.paths.pop();
+        require.paths.push(phantom.casperScriptBaseDir);
+    }
+
     // casper loading status flag
     phantom.casperLoaded = true;