added callback function & doublecheck double files

Author: Topener

README.md

@@ -53,7 +53,15 @@ This method is preferred for bigger images, as this can happen in the background
 require('To.ImageCache').cache('http://example.com/image.jpg');
 ```
 
-This function will NOT return a blob, but will cache the file using `XHR`. 
+This function will NOT return a blob, but will cache the file using `XHR`.
+
+Aditonally, you can add a timeout and callback function: 
+
+```js
+require('To.ImageCache').cache('http://example.com/image.jpg', 25000, function(blob){
+	$.imageView.image = blob;
+});
+```
 
 ## Clearing Cache
 

To.ImageCache/0.1/To.ImageCache.js renamed to To.ImageCache/0.1.1/To.ImageCache.js

@@ -150,6 +150,12 @@ var storeFile = function(filename, blob){
 	// check if directory has been created
 	checkDir();
 
+	// we already have this file
+	if (hasFile(filename)){
+		blob = null;
+		return;
+	}
+	
 	var path = Ti.Filesystem.applicationDataDirectory + c.folder;
 	var file = Ti.Filesystem.getFile(path, filename);
 	file.write(blob);
@@ -231,9 +237,10 @@ var remoteImage = function(url){
  * This function will fetch the image in the background
  * with a configurable cache period
  * @param {String} url of the image to cache
- * @param {Integer} Timeout in milliseconds
+ * @param {Integer} (Optional) Timeout in milliseconds
+ * @param {Function} (Optional) callback function, blob will be returned
  */
-var cache = function(url, timeout){
+var cache = function(url, timeout, cb){
 	var timeout = timeout || 30000;
 
 	// if file is already cached, don't do so again
@@ -248,6 +255,7 @@ var cache = function(url, timeout){
 	var xhr = Titanium.Network.createHTTPClient({
 		onload: function() {
 			storeFile(filename, this.responseData);
+			cb && cb(readFile(filename));
 		},
 		timeout: timeout
 	});

To.ImageCache/0.1/manifest renamed to To.ImageCache/0.1.1/manifest

@@ -1,4 +1,4 @@
-version: 0.1
+version: 0.1.1
 description: A simple Commonjs module to cache images a little less temporarily
 author: Rene Pot
 license: Apache 2.0