Enable mobile view. Use local storage to remember whether you chose mobile or desktop view. Mobile device detection needs to be replaced with a better solution.

app/assets/javascripts/discourse.js

@@ -143,8 +143,7 @@ Discourse = Ember.Application.createWithMixins(Discourse.Ajax, {
     bootbox.animate(false);
     bootbox.backdrop(true); // clicking outside a bootbox modal closes it
 
-    Discourse.Session.currentProp('mobileDevice', $html.hasClass('mobile-device'));
-    Discourse.Session.currentProp('mobileView', $html.hasClass('mobile-view'));
+    Discourse.Mobile.init();
 
     setInterval(function(){
       Discourse.Formatter.updateRelativeAge($('.relative-date'));

app/assets/javascripts/discourse/components/mobile.js

@@ -0,0 +1,36 @@
+/**
+  A class that is responsible for logic related to mobile devices.
+
+  @class Mobile
+  @namespace Discourse
+  @module Discourse
+**/
+Discourse.Mobile = {
+
+  isMobileDevice: false,
+  mobileView: false,
+
+  init: function() {
+    var $html = $('html');
+    this.isMobileDevice = $html.hasClass('mobile-device');
+    this.mobileView = $html.hasClass('mobile-view');
+
+    if (localStorage && localStorage.mobileView) {
+      var savedValue = (localStorage.mobileView === 'true' ? true : false);
+      if (savedValue !== this.mobileView) {
+        this.reloadPage(savedValue);
+      }
+    }
+  },
+
+  toggleMobileView: function() {
+    if (localStorage) {
+      localStorage.mobileView = !this.mobileView;
+    }
+    this.reloadPage(!this.mobileView);
+  },
+
+  reloadPage: function(mobile) {
+    window.location.assign(window.location.pathname + '?mobile_view=' + (mobile ? '1' : '0'));
+  }
+};

app/assets/javascripts/discourse/controllers/header_controller.js

@@ -25,15 +25,15 @@ Discourse.HeaderController = Discourse.Controller.extend({
   }.property('currentUser', 'topic.isPrivateMessage'),
 
   mobileDevice: function() {
-    return Discourse.Session.currentProp('mobileDevice');
+    return Discourse.Mobile.isMobileDevice;
   }.property(),
 
   mobileView: function() {
-    return Discourse.Session.currentProp('mobileView');
+    return Discourse.Mobile.mobileView;
   }.property(),
 
   toggleMobileView: function() {
-    window.location.assign(window.location.pathname + '?mobile_view=' + (Discourse.Session.currentProp('mobileView') ? '0' : '1'));
+    Discourse.Mobile.toggleMobileView();
   }
 
 });

app/assets/javascripts/discourse/views/header_view.js

@@ -98,7 +98,7 @@ Discourse.HeaderView = Discourse.View.extend({
   **/
   logoHTML: function() {
     var result = "<div class='title'><a href='" + Discourse.getURL("/") + "'>";
-    if (!Discourse.Session.currentProp('mobileView') && this.get('controller.showExtraInfo')) {
+    if (!Discourse.Mobile.mobileView && this.get('controller.showExtraInfo')) {
       var logoSmall = Discourse.SiteSettings.logo_small_url;
       if (logoSmall && logoSmall.length > 1) {
         result += "<img class='logo-small' src='" + logoSmall + "' width='33' height='33'>";

app/helpers/application_helper.rb

@@ -117,8 +117,7 @@ module ApplicationHelper
   end
 
   def mobile_device?
-    # For now, don't show mobile view unless you put ?mobile_view=1 in the URL.
-    # request.user_agent =~ /Mobile|webOS/
-    false
+    # TODO: this is dumb. user agent matching is a doomed approach. a better solution is coming.
+    request.user_agent =~ /Mobile|webOS/ and !(request.user_agent =~ /iPad/)
   end
 end

spec/helpers/application_helper_spec.rb

@@ -13,18 +13,28 @@ describe ApplicationHelper do
       helper.mobile_view?.should be_false
     end
 
-    it "is false if mobile_view is not set and user agent is not mobile" do
-      controller.request.stubs(:user_agent).returns('Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.17 Safari/537.36')
-      helper.mobile_view?.should be_false
-    end
+    context "mobile_view is not set" do
+      it "is false if user agent is not mobile" do
+        controller.request.stubs(:user_agent).returns('Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.17 Safari/537.36')
+        helper.mobile_view?.should be_false
+      end
 
-    #it "is true if mobile_view is not set and user agent is mobile" do
-    it "is always false, even if user agent is for mobile device... for now..." do
-      controller.request.stubs(:user_agent).returns('Mozilla/5.0 (iPhone; U; ru; CPU iPhone OS 4_2_1 like Mac OS X; ru) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148a Safari/6533.18.5')
-      #helper.mobile_view?.should be_true
-      # TODO: It's always false for now
-      helper.mobile_view?.should be_false
+      it "is true for iPhone" do
+        controller.request.stubs(:user_agent).returns('Mozilla/5.0 (iPhone; U; ru; CPU iPhone OS 4_2_1 like Mac OS X; ru) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148a Safari/6533.18.5')
+        helper.mobile_view?.should be_true
+      end
+
+      it "is false for iPad" do
+        controller.request.stubs(:user_agent).returns("Mozilla/5.0 (iPad; CPU OS 5_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B176 Safari/7534.48.3")
+        helper.mobile_view?.should be_false
+      end
+
+      it "is false for Android tablet" do
+        controller.request.stubs(:user_agent).returns("Mozilla/5.0 (Linux; Android 4.1.2; Nexus 7 Build/JZ054K) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Safari/535.19")
+        helper.mobile_view?.should be_false
+      end
     end
   end
 
+
 end