music: add playlist limiting via --limit=<number>

src/modules/music.js

@@ -50,7 +50,7 @@ async function getSoundcloudClientID() {
   return null;
 }
 
-async function processPlaylist(url, type, shuffle = false) {
+async function processPlaylist(url, type, shuffle = false, limit = -1) {
   let playlist;
 
   if (type === "yt") {
@@ -108,6 +108,10 @@ async function processPlaylist(url, type, shuffle = false) {
     shuffleArray(playlist);
   }
 
+  if (limit > 0) {
+    playlist = playlist.slice(0, limit);
+  }
+
   return playlist;
 }
 
@@ -361,7 +365,7 @@ const command = new Command("music");
 command.addAlias("m");
 command.category = "misc";
 command.helpText = "Music";
-command.usage = "[search term]";
+command.usage = "help";
 command.callback = async function (msg, line) {
   if (!msg.guildID) return "This command can only be used in guilds.";
 
@@ -380,9 +384,15 @@ command.callback = async function (msg, line) {
         }
 
         let shuffle = false;
-        if (argStr.startsWith("--shuffle ")) {
+        if (argStr.includes("--shuffle")) {
           shuffle = true;
-          argStr = argStr.replace(/^--shuffle /, "");
+          argStr = argStr.replace("--shuffle", "").trim();
+        }
+
+        let limit = -1;
+        if (argStr.match(/--limit=(\d+)/)) {
+          limit = argStr.match(/--limit=(\d+)/)[1];
+          argStr = argStr.replace(/--limit=(\d+)/, "").trim();
         }
 
         let type;
@@ -425,7 +435,12 @@ command.callback = async function (msg, line) {
                 },
               ],
             });
-            const playlist = await processPlaylist(argStr, type, shuffle);
+            const playlist = await processPlaylist(
+              argStr,
+              type,
+              shuffle,
+              limit
+            );
             await statusMessage.edit({
               embeds: [
                 {