Improve performance (#162)

DiscordChatExporter.Core.Models/Guild.cs

@@ -0,0 +1,38 @@
+namespace DiscordChatExporter.Core.Models
+{
+    // https://discordapp.com/developers/docs/resources/guild#guild-object
+
+    public partial class Guild
+    {
+        public string Id { get; }
+
+        public string Name { get; }
+
+        public string IconHash { get; }
+
+        public string IconUrl { get; }
+
+        public Guild(string id, string name, string iconHash)
+        {
+            Id = id;
+            Name = name;
+            IconHash = iconHash;
+
+            IconUrl = GetIconUrl(id, iconHash);
+        }
+
+        public override string ToString() => Name;
+    }
+
+    public partial class Guild
+    {
+        public static string GetIconUrl(string id, string iconHash)
+        {
+            return iconHash != null
+                ? $"https://cdn.discordapp.com/icons/{id}/{iconHash}.png"
+                : "https://cdn.discordapp.com/embed/avatars/0.png";
+        }
+
+        public static Guild DirectMessages { get; } = new Guild("@me", "Direct Messages", null);
+    }
+}