Add TDPF_createStorage as a plugin replacement for localStorage

Resources/Scripts/imports/scripts/plugins.base.js

@@ -21,6 +21,11 @@
     $TDP.checkFileExists(token, fileNameUser).then(exists => {
       let fileName = exists ? fileNameUser : fileNameDefault;
       
+      if (fileName === null){
+        onSuccess && onSuccess({});
+        return;
+      }
+      
       (exists ? $TDP.readFile(token, fileName, true) : $TDP.readFileRoot(token, fileName)).then(contents => {
         let obj;
         
@@ -63,4 +68,105 @@
       element: element
     };
   };
+  
+  //
+  // Block: Setup a function to mimic a Storage object that will be saved in the plugin.
+  //
+  window.TDPF_createStorage = function(pluginObject, onReady){
+    validatePluginObject(pluginObject);
+    
+    if ("$storage" in pluginObject){
+      if (pluginObject.$storage !== null){ // set to null while the file is still loading
+        onReady(pluginObject.$storage);
+      }
+      
+      return;
+    }
+    
+    class Storage{
+      get length(){
+        return Object.keys(this).length;
+      }
+      
+      key(index){
+        return Object.keys(this)[index];
+      }
+      
+      getItem(key){
+        return this[key] || null;
+      }
+      
+      setItem(key, value){
+        this[key] = value;
+        updateFile();
+      }
+      
+      removeItem(key){
+        delete this[key];
+        updateFile();
+      }
+      
+      clear(){
+        for(key of Object.keys(this)){
+          delete this[key];
+        }
+        
+        updateFile();
+      }
+      
+      replace(obj, silent){
+        for(let key of Object.keys(this)){
+          delete this[key];
+        }
+        
+        for(let key in obj){
+          this[key] = obj[key];
+        }
+        
+        if (!silent){
+          updateFile();
+        }
+      }
+    };
+    
+    var storage = new Proxy(new Storage(), {
+      get: function(obj, prop, receiver){
+        const value = obj[prop];
+        return typeof value === "function" ? value.bind(obj) : value;
+      },
+      
+      set: function(obj, prop, value){
+        obj.setItem(prop, value);
+        return true;
+      },
+      
+      deleteProperty: function(obj, prop){
+        obj.removeItem(prop);
+        return true;
+      },
+      
+      enumerate: function(obj){
+        return Object.keys(obj);
+      }
+    });
+    
+    var delay = -1;
+    
+    const updateFile = function(){
+      window.clearTimeout(delay);
+      
+      delay = window.setTimeout(function(){
+        $TDP.writeFile(pluginObject.$token, ".storage", JSON.stringify(storage));
+      }, 0);
+    };
+    
+    pluginObject.$storage = null;
+    
+    window.TDPF_loadConfigurationFile(pluginObject, ".storage", null, function(obj){
+      storage.replace(obj, true);
+      onReady(pluginObject.$storage = storage);
+    }, function(){
+      onReady(pluginObject.$storage = storage);
+    });
+  };
 })();