Add the ability to "resolve" values

closes #10

Readme.md

@@ -23,3 +23,18 @@ If your objective is to simply require all .js and .json files in a directory yo
 ``` js
 var libs = require('require-all')(__dirname + '/lib');
 ```
+
+## Constructed object usage
+
+If your directory contains files that all export constructors, you can require them all and automatically construct the objects using `resolve`:
+
+```js
+var controllers = require('require-all')({
+  dirname     :  __dirname + '/controllers',
+  filter      :  /(.+Controller)\.js$/,
+  excludeDirs :  /^\.(git|svn)$/,
+  resolve     : function (Controller) {
+    return new Controller();
+  }
+});
+```

index.js

@@ -11,6 +11,7 @@ module.exports = function requireAll(options) {
 
   var files = fs.readdirSync(options.dirname);
   var modules = {};
+  var resolve = options.resolve || identity;
 
   function excludeDirectory(dirname) {
     return options.excludeDirs && dirname.match(options.excludeDirs);
@@ -25,16 +26,21 @@ module.exports = function requireAll(options) {
       modules[file] = requireAll({
         dirname: filepath,
         filter: options.filter,
-        excludeDirs: options.excludeDirs
+        excludeDirs: options.excludeDirs,
+        resolve: resolve
       });
 
     } else {
       var match = file.match(options.filter);
       if (!match) return;
 
-      modules[match[1]] = require(filepath);
+      modules[match[1]] = resolve(require(filepath));
     }
   });
 
   return modules;
 };
+
+function identity(val) {
+  return val;
+}

test/resolved/onearg.js

@@ -0,0 +1,3 @@
+module.exports = function (arg1, arg2) {
+	return arg1;
+}

test/resolved/twoargs.js

@@ -0,0 +1,3 @@
+module.exports = function (arg1, arg2) {
+	return arg2;
+}

test/test.js

@@ -80,3 +80,14 @@ var excludedSvnAndSub = requireAll({
 assert.equal(excludedSvnAndSub['.svn'], undefined);
 assert.ok(excludedSvnAndSub.root);
 assert.equal(excludedSvnAndSub.sub, undefined);
+
+var resolvedValues = requireAll({
+  dirname: __dirname + '/resolved',
+  filter: /(.+)\.js$/,
+  resolve: function (fn) {
+    return fn('arg1', 'arg2');
+  }
+});
+
+assert.equal(resolvedValues.onearg, 'arg1');
+assert.equal(resolvedValues.twoargs, 'arg2');