Moved Help to its own file, created administration module which now contains help. I will add more commands to it in the future.

NadekoBot/Commands/HelpCommand.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Threading.Tasks;
+using Discord.Commands;
+
+namespace NadekoBot
+{
+    class HelpCommand : DiscordCommand
+    {
+        public override Func<CommandEventArgs, Task> DoFunc()
+        {
+            return async e =>
+                {
+                    string helpstr = "";
+                    foreach (var com in client.Commands().AllCommands)
+                    {
+                        helpstr += "&###**#" + com.Category + "#**\n";
+                        helpstr += PrintCommandHelp(com);
+                    }
+                    while (helpstr.Length > 2000)
+                    {
+                        var curstr = helpstr.Substring(0, 2000);
+                        await client.SendPrivateMessage(e.User, curstr.Substring(0, curstr.LastIndexOf("&")));
+                        helpstr = curstr.Substring(curstr.LastIndexOf("&")) + helpstr.Substring(2000);
+                    }
+                    await client.SendPrivateMessage(e.User, helpstr);
+                };
+        }
+
+        public override void Init(CommandGroupBuilder cgb)
+        {
+            cgb.CreateCommand("-h")
+                .Alias(new string[] { "-help", NadekoBot.botMention + " help", NadekoBot.botMention + " h" })
+                .Description("Help command")
+                .Do(DoFunc());
+        }
+
+        private string PrintCommandHelp(Command com)
+        {
+            var str = "`" + com.Text + "`\n";
+            foreach (var a in com.Aliases)
+                str += "`" + a + "`\n";
+            str += "Description: " + com.Description + "\n";
+            return str;
+        }
+    }
+}