Add /hidealtstext command

When a user is spamming, often times they are doing so under several accounts.  When this happens, a staff member has to manually hide each alts messages in the room, which takes up one line of the chat for each alt.  This command makes these cases easier and less-spammy for the chat.

chat-commands.js

@@ -2186,7 +2186,9 @@ exports.commands = {
 	},
 	unnamelockhelp: ["/unnamelock [username] - Unnamelocks the user. Requires: % @ * & ~"],
 
-	hidetext: function (target, room, user) {
+	hidetextalts: 'hidetext',
+	hidealtstext: 'hidetext',
+	hidetext: function (target, room, user, connection, cmd) {
 		if (!target) return this.parse('/help hidetext');
 
 		this.splitTarget(target);
@@ -2203,11 +2205,22 @@ exports.commands = {
 			return this.errorReply("User '" + name + "' is not banned from this room or locked.");
 		}
 
-		this.addModCommand("" + targetUser.name + "'s messages were cleared from  " + room.title + " by " + user.name + ".");
-		this.add('|unlink|' + hidetype + userid);
-		if (userid !== toId(this.inputUsername)) this.add('|unlink|' + hidetype + toId(this.inputUsername));
+		if (cmd === 'hidealtstext' || cmd === 'hidetextalts') {
+			this.addModCommand(`${targetUser.name}'s alts' messages were cleared from ${room.title} by ${user.name}.`);
+			this.add(`|unlink|${hidetype}${userid}`);
+			for (let i in targetUser.prevNames) {
+				this.add(`|unlink|${hidetype}${targetUser.prevNames[i]}`);
+			}
+		} else {
+			this.addModCommand("" + targetUser.name + "'s messages were cleared from  " + room.title + " by " + user.name + ".");
+			this.add('|unlink|' + hidetype + userid);
+			if (userid !== toId(this.inputUsername)) this.add('|unlink|' + hidetype + toId(this.inputUsername));
+		}
 	},
-	hidetexthelp: ["/hidetext [username] - Removes a locked or banned user's messages from chat (includes users banned from the room). Requires: % (global only), @ * # & ~"],
+	hidetexthelp: [
+		"/hidetext [username] - Removes a locked or banned user's messages from chat (includes users banned from the room). Requires: % (global only), @ * # & ~",
+		"/hidealtstext OR /hidetextalts [username] - Removes a locked or banned user's messages, and their alternate account's messages from the chat (includes users banned from the room).  Requires: % (global only), @ * # & ~",
+	],
 
 	ab: 'blacklist',
 	blacklist: function (target, room, user) {