Add a Discord message request hook and a function to retrieve selected channel info

src/tracker/discord.js

@@ -1 +1,69 @@
-/* discord.js */
+var DISCORD = (function(){
+  var regexMessageRequest = /\/channels\/(\d+)\/messages[^a-z]/;
+  
+  return {
+    /*
+     * Sets up a callback hook to trigger whenever a message request returns a response (the callback is given the channel ID and message array).
+     */
+    setupMessageRequestHook: function(callback){
+      HOOKS.onAjaxResponse(function(args, req){
+        var match = args[1].match(regexMessageRequest);
+        
+        if (match){
+          var channel = match[1];
+          var messages = JSON.parse(req.response);
+          
+          callback(channel, messages);
+        }
+      });
+    },
+    
+    /*
+     * Returns an object containing the selected server name, selected channel name and ID, and the object type.
+     * For types DM and GROUP, the server and channel names are identical.
+     */
+    getSelectedChannel: function(){
+      var obj;
+      var channelListEle = DOM.cls("private-channels");
+      
+      if (channelListEle.length !== 0){
+        var channel = DOM.cls("selected", channelListEle[0])[0];
+        
+        if (!channel || !channel.classList.contains("private")){
+          return null;
+        }
+        else{
+          var linkSplit = DOM.tag("a", channel)[0].getAttribute("href").split("/");
+          var name = [].find.call(DOM.cls("channel-name", channel)[0].childNodes, node => node.nodeType === Node.TEXT_NODE).nodeValue;
+          
+          obj = {
+            server: name,
+            channel: name,
+            id: linkSplit[linkSplit.length-1],
+            type: DOM.cls("status", channel).length ? "DM" : "GROUP"
+          };
+        }
+      }
+      else{
+        channelListEle = DOM.cls("guild-channels");
+        
+        if (channelListEle.length === 0){
+          return null;
+        }
+        else{
+          var linkSplit = DOM.tag("a", channel)[0].getAttribute("href").split("/");
+          var name = DOM.tag("span", DOM.cls("guild-header")[0]).innerHTML;
+
+          obj = {
+            server: DOM.tag("span", DOM.cls("guild-header")[0])[0].innerHTML,
+            channel: DOM.cls("channel-name", DOM.cls("selected", channelListEle[0])[0])[0].innerHTML,
+            id: linkSplit[linkSplit.length-1],
+            type: "SERVER"
+          };
+        }
+      }
+      
+      return obj.channel.length === 0 ? null : obj;
+    }
+  };
+})();