Add a theme selector in the settings

Power to the people!

There is now 2 ways to set the theme: on the app config file (defaults
for all users) and in the user settings.
All CSS files present in the `client/themes` folder will be given as
choices to the users.

This is temporary (as in, temporary for a fairly long time) until we
have proper theme management.

client/index.html

@@ -15,7 +15,7 @@
 
 	<link rel="stylesheet" href="css/bootstrap.css">
 	<link rel="stylesheet" href="css/style.css">
-	<link id="theme" rel="stylesheet" href="<%= typeof(theme) !== "undefined" ? theme : "themes/example.css" %>">
+	<link id="theme" rel="stylesheet" href="<%= theme %>">
 	<style id="user-specified-css"></style>
 
 	<link rel="shortcut icon" href="img/favicon.png" data-other="img/favicon-notification.png" data-toggled="false" id="favicon">
@@ -241,6 +241,19 @@
 									Enable colored nicknames
 								</label>
 							</div>
+							<div class="col-sm-12">
+								<h2>Theme</h2>
+							</div>
+							<div class="col-sm-12">
+								<label for="theme-select" class="sr-only">Theme</label>
+								<select id="theme-select" name="theme" class="input">
+									<% themes.forEach(function(themeName) { %>
+										<option value="<%= themeName %>">
+											<%= themeName.charAt(0).toUpperCase() + themeName.slice(1) %>
+										</option>
+									<% }) %>
+								</select>
+							</div>
 							<% if (typeof prefetch === "undefined" || prefetch !== false) { %>
 							<div class="col-sm-12">
 								<h2>Links and URLs</h2>

client/js/lounge.js

@@ -473,6 +473,7 @@ $(function() {
 		notifyAllMessages: false,
 		part: true,
 		quit: true,
+		theme: $("#theme").attr("href").replace(/^themes\/(.*).css$/, "$1"), // Extracts default theme name, set on the server configuration
 		thumbnails: true,
 		userStyles: userStyles.text(),
 	}, JSON.parse(window.localStorage.getItem("settings")));
@@ -485,6 +486,9 @@ $(function() {
 			settings.find("#user-specified-css-input").val(options[i]);
 		} else if (i === "highlights") {
 			settings.find("input[name=" + i + "]").val(options[i]);
+		} else if (i === "theme") {
+			$("#theme").attr("href", "themes/" + options[i] + ".css");
+			settings.find("select[name=" + i + "]").val(options[i]);
 		} else if (options[i]) {
 			settings.find("input[name=" + i + "]").prop("checked", true);
 		}
@@ -516,6 +520,8 @@ $(function() {
 			chat.toggleClass("hide-" + name, !self.prop("checked"));
 		} else if (name === "coloredNicks") {
 			chat.toggleClass("colored-nicks", self.prop("checked"));
+		} else if (name === "theme") {
+			$("#theme").attr("href", "themes/" + options[name] + ".css");
 		} else if (name === "userStyles") {
 			$(document.head).find("#user-specified-css").html(options[name]);
 		} else if (name === "highlights") {

src/server.js

@@ -122,6 +122,11 @@ function index(req, res, next) {
 			Helper.config
 		);
 		data.gitCommit = gitCommit;
+		data.themes = fs.readdirSync("client/themes/").filter(function(file) {
+			return file.endsWith(".css");
+		}).map(function(css) {
+			return css.slice(0, -4);
+		});
 		var template = _.template(file);
 		res.setHeader("Content-Security-Policy", "default-src *; style-src * 'unsafe-inline'; script-src 'self'; child-src 'none'; object-src 'none'; form-action 'none'; referrer no-referrer;");
 		res.setHeader("Content-Type", "text/html");