Create cache folder if not exists.

Signed-off-by: Eric Wang <[email protected]>

Author: skygragon

lib/cache.js

@@ -13,6 +13,9 @@ cache.get = function(k) {
 };
 
 cache.set = function(k, v) {
+  var dir = h.getCacheDir();
+  if (!fs.existsSync(dir)) fs.mkdirSync(dir);
+
   var fullpath = h.getCacheFile(k);
   fs.writeFileSync(fullpath, JSON.stringify(v));
   return true;