utility.banner: server support

src/modules/utility.js

@@ -137,7 +137,28 @@ banner.usage = "<user>";
 banner.callback = async function (msg, line) {
   let id = msg.author.id;
 
-  if (line) {
+  if (line == "--server" || line == "--guild") {
+    if (!msg.channel.guild) {
+      return "`--server/--guild` can only be used within guilds.";
+    } else {
+      const url = `${BANNER_BASE}${msg.channel.guild.id}/${
+        msg.channel.guild.banner
+      }.${
+        msg.channel.guild.banner.startsWith("a_")
+          ? "gif?size=1024&_=.gif"
+          : "png?size=1024"
+      }`;
+      return {
+        embed: {
+          title: "Server Banner",
+          url,
+          image: {
+            url,
+          },
+        },
+      };
+    }
+  } else if (line) {
     const lookup = await lookupUser(msg, line);
     if (
       lookup == "No results" ||