diff --git a/client/js/lounge.js b/client/js/lounge.js
index 440920f2..53f8acef 100644
--- a/client/js/lounge.js
+++ b/client/js/lounge.js
@@ -182,14 +182,12 @@ $(function() {
 		input.val("");
 		resetInputHeight(input.get(0));
 
-		if (text.indexOf("/collapse") === 0) {
-			$(".chan.active .toggle-preview.opened").click();
-			return;
-		}
-
-		if (text.indexOf("/expand") === 0) {
-			$(".chan.active .toggle-preview:not(.opened)").click();
-			return;
+		if (text.charAt(0) === "/") {
+			const args = text.substr(1).split(" ");
+			const cmd = args.shift().toLowerCase();
+			if (typeof utils.inputCommands[cmd] === "function" && utils.inputCommands[cmd](args)) {
+				return;
+			}
 		}
 
 		socket.emit("input", {
@@ -198,18 +196,6 @@ $(function() {
 		});
 	});
 
-	function findCurrentNetworkChan(name) {
-		name = name.toLowerCase();
-
-		return $(".network .chan.active")
-			.parent(".network")
-			.find(".chan")
-			.filter(function() {
-				return $(this).data("title").toLowerCase() === name;
-			})
-			.first();
-	}
-
 	$("button#set-nick").on("click", function() {
 		utils.toggleNickEditor(true);
 
@@ -266,7 +252,7 @@ $(function() {
 
 	chat.on("click", ".inline-channel", function() {
 		var name = $(this).data("chan");
-		var chan = findCurrentNetworkChan(name);
+		var chan = utils.findCurrentNetworkChan(name);
 
 		if (chan.length) {
 			chan.click();
@@ -284,7 +270,7 @@ $(function() {
 
 	chat.on("click", ".user", function() {
 		var name = $(this).data("name");
-		var chan = findCurrentNetworkChan(name);
+		var chan = utils.findCurrentNetworkChan(name);
 
 		if (chan.length) {
 			chan.click();
diff --git a/client/js/utils.js b/client/js/utils.js
index 07b1d328..04974c13 100644
--- a/client/js/utils.js
+++ b/client/js/utils.js
@@ -7,6 +7,8 @@ var serverHash = -1;
 var lastMessageId = -1;
 
 module.exports = {
+	inputCommands: {collapse, expand, join},
+	findCurrentNetworkChan,
 	serverHash,
 	lastMessageId,
 	confirmExit,
@@ -19,6 +21,18 @@ module.exports = {
 	requestIdleCallback,
 };
 
+function findCurrentNetworkChan(name) {
+	name = name.toLowerCase();
+
+	return $(".network .chan.active")
+		.parent(".network")
+		.find(".chan")
+		.filter(function() {
+			return $(this).data("title").toLowerCase() === name;
+		})
+		.first();
+}
+
 function resetHeight(element) {
 	element.style.height = element.style.minHeight;
 }
@@ -29,6 +43,27 @@ function forceFocus() {
 	input.trigger("click").focus();
 }
 
+function collapse() {
+	$(".chan.active .toggle-button.opened").click();
+	return true;
+}
+
+function expand() {
+	$(".chan.active .toggle-button:not(.opened)").click();
+	return true;
+}
+
+function join(args) {
+	const channel = args[0];
+	if (channel) {
+		const chan = findCurrentNetworkChan(channel);
+		if (chan.length) {
+			chan.click();
+			return true;
+		}
+	}
+}
+
 function toggleNickEditor(toggle) {
 	$("#nick").toggleClass("editable", toggle);
 	$("#nick-value").attr("contenteditable", toggle);