add the ability to exclude folders from recursive file search

.gitignore

@@ -28,3 +28,5 @@ node_modules
 
 # Users Environment Variables
 .lock-wscript
+
+.vscode

README.md

@@ -25,6 +25,10 @@ var recursiveReadSync = require('recursive-readdir-sync')
 
 try {
   files = recursiveReadSync('/your/path/here');
+
+  // optional
+  files = recursiveReadSync('/your/path/here', ['excluded folder1','excluded folder2']);
+
 } catch(err){
   if(err.errno === 34){
     console.log('Path does not exist');

index.js

@@ -3,16 +3,18 @@ var fs = require('fs')
   ;
 
 // how to know when you are done?
-function recursiveReaddirSync(path) {
+function recursiveReaddirSync(path, excludeFolders) {
   var list = []
     , files = fs.readdirSync(path)
     , stats
     ;
 
   files.forEach(function (file) {
     stats = fs.lstatSync(p.join(path, file));
-    if(stats.isDirectory()) {
-      list = list.concat(recursiveReaddirSync(p.join(path, file)));
+    if (stats.isDirectory()) {
+      if (IsArray(excludeFolders) && isObjInArray(file, excludeFolders))
+        return;
+      list = list.concat(recursiveReaddirSync(p.join(path, file), excludeFolders));
     } else {
       list.push(p.join(path, file));
     }
@@ -21,4 +23,15 @@ function recursiveReaddirSync(path) {
   return list;
 }
 
+function IsArray(obj) {
+  return Object.prototype.toString.call(obj) === '[object Array]';
+}
+
+function isObjInArray(obj, array) {
+  var index = array.indexOf(obj);
+  if (index === -1)
+    return false;
+  return true;
+}
+
 module.exports = recursiveReaddirSync;

test/index.js

@@ -29,7 +29,7 @@ describe('Functionality testing.', function(){
     return path.resolve(__dirname, f);
   });
 
-  var results = recursiveReaddirSync(__dirname + '/nested');
+  var results = recursiveReaddirSync(__dirname + '/nested',['exclude folder']);
 
   it('should return an array with length equal to that of expectedFiles', function(){
       expect(results).to.have.length(expectedFiles.length);