merging node into master -- you can now pass the --narwhal flag to use narwhal instead. All tests are executing successfully against both Node.js and Narwhal/Rhino backends

lib/coffee_script/coffee-script.js

@@ -0,0 +1,50 @@
+(function(){
+  var compiler, path;
+  // Executes the `coffee` Ruby program to convert from CoffeeScript to JavaScript.
+  path = require('path');
+  // The path to the CoffeeScript executable.
+  compiler = path.normalize(path.dirname(__filename) + '/../../bin/coffee');
+  // Compile a string over stdin, with global variables, for the REPL.
+  exports.compile = function compile(code, callback) {
+    var coffee, js;
+    js = '';
+    coffee = process.createChildProcess(compiler, ['--eval', '--no-wrap', '--globals']);
+    coffee.addListener('output', function(results) {
+      if ((typeof results !== "undefined" && results !== null)) {
+        return js += results;
+      }
+    });
+    coffee.addListener('exit', function() {
+      return callback(js);
+    });
+    coffee.write(code);
+    return coffee.close();
+  };
+  // Compile a list of CoffeeScript files on disk.
+  exports.compile_files = function compile_files(paths, callback) {
+    var coffee, exit_ran, js;
+    js = '';
+    coffee = process.createChildProcess(compiler, ['--print'].concat(paths));
+    coffee.addListener('output', function(results) {
+      if ((typeof results !== "undefined" && results !== null)) {
+        return js += results;
+      }
+    });
+    // NB: we have to add a mutex to make sure it doesn't get called twice.
+    exit_ran = false;
+    coffee.addListener('exit', function() {
+      if (exit_ran) {
+        return null;
+      }
+      exit_ran = true;
+      return callback(js);
+    });
+    return coffee.addListener('error', function(message) {
+      if (!(message)) {
+        return null;
+      }
+      puts(message);
+      throw new Error("CoffeeScript compile error");
+    });
+  };
+})();