Add local default icon + implements files search cache

js/util/cache.js

@@ -0,0 +1,33 @@
+
+function Cache() {
+  this._store = {};
+}
+
+Cache.prototype.get = function(key) {
+  key = this._serialize(key);
+  return key in this._store ? this._store[key] : undefined;
+};
+
+Cache.prototype.set = function(key, value) {
+  key = this._serialize(key);
+  this._store[key] = value;
+  return this;
+};
+
+Cache.prototype._serialize = function(mixedKey) {
+  var json = JSON.stringify(mixedKey);
+  return this._hash(json);
+};
+
+Cache.prototype._hash = function(str) {
+  var hash = 0, i, chr, len;
+  if (str.length === 0) return hash;
+  for (i = 0, len = str.length; i < len; i++) {
+    chr   = str.charCodeAt(i);
+    hash  = ((hash << 5) - hash) + chr;
+    hash |= 0; // Convert to 32bit integer
+  }
+  return hash;
+};
+
+module.exports = Cache;

js/util/index.js

@@ -1,2 +1,3 @@
 exports.System = require('./system');
 exports.DesktopApps = require('./desktop-apps');
+exports.Cache = require('./cache');

js/util/system.js

@@ -2,6 +2,7 @@ var fs = require('fs');
 var cp = require('child_process');
 var glob = require('glob');
 var ini = require('ini');
+var Cache = require('./cache');
 
 /**
  * Load a JSON file
@@ -52,12 +53,22 @@ exports.runApp = function(execPath) {
   });
 };
 
+var _searchCache = new Cache();
+
 exports.findFiles = function(pattern, opts) {
   return new Promise(function(resolve, reject) {
+
+    var cachedResult = _searchCache.get([pattern, opts]);
+    if( cachedResult !== undefined) {
+      return resolve(cachedResult);
+    }
+
     glob(pattern, opts, function(err, files) {
       if(err) return reject(err);
+      _searchCache.set([pattern, opts], files);
       return resolve(files);
     });
+
   });
 };