Add PreferencesHelper module

Consolidates the helpers related to user preferences.

Renames `app_theme` to `user_application_theme` to better explain what
it is.

app/helpers/application_helper.rb

@@ -2,26 +2,6 @@ require 'digest/md5'
 require 'uri'
 
 module ApplicationHelper
-  COLOR_SCHEMES = {
-    1 => 'white',
-    2 => 'dark',
-    3 => 'solarized-light',
-    4 => 'solarized-dark',
-    5 => 'monokai',
-  }
-  COLOR_SCHEMES.default = 'white'
-
-  # Helper method to access the COLOR_SCHEMES
-  #
-  # The keys are the `color_scheme_ids`
-  # The values are the `name` of the scheme.
-  #
-  # The preview images are `name-scheme-preview.png`
-  # The stylesheets should use the css class `.name`
-  def color_schemes
-    COLOR_SCHEMES.freeze
-  end
-
   # Check if a particular controller is the current one
   #
   # args - One or more controller names to check
@@ -138,15 +118,6 @@ module ApplicationHelper
     Emoji.names.to_s
   end
 
-  def app_theme
-    theme = Gitlab::Themes.by_id(current_user.try(:theme_id))
-    theme.css_class
-  end
-
-  def user_color_scheme_class
-    COLOR_SCHEMES[current_user.try(:color_scheme_id)] if defined?(current_user)
-  end
-
   # Define whenever show last push event
   # with suggestion to create MR
   def show_last_push_widget?(event)

app/helpers/gitlab_markdown_helper.rb

@@ -2,6 +2,7 @@ require 'nokogiri'
 
 module GitlabMarkdownHelper
   include Gitlab::Markdown
+  include PreferencesHelper
 
   # Use this in places where you would normally use link_to(gfm(...), ...).
   #

app/helpers/preferences_helper.rb

+# Helper methods for per-User preferences
+module PreferencesHelper
+  COLOR_SCHEMES = {
+    1 => 'white',
+    2 => 'dark',
+    3 => 'solarized-light',
+    4 => 'solarized-dark',
+    5 => 'monokai',
+  }
+  COLOR_SCHEMES.default = 'white'
+
+  # Helper method to access the COLOR_SCHEMES
+  #
+  # The keys are the `color_scheme_ids`
+  # The values are the `name` of the scheme.
+  #
+  # The preview images are `name-scheme-preview.png`
+  # The stylesheets should use the css class `.name`
+  def color_schemes
+    COLOR_SCHEMES.freeze
+  end
+
+  def user_application_theme
+    theme = Gitlab::Themes.by_id(current_user.try(:theme_id))
+    theme.css_class
+  end
+
+  def user_color_scheme_class
+    COLOR_SCHEMES[current_user.try(:color_scheme_id)] if defined?(current_user)
+  end
+end

app/views/layouts/application.html.haml

 !!! 5
 %html{ lang: "en"}
   = render "layouts/head"
-  %body{class: "#{app_theme}", :'data-page' => body_data_page}
-    / Ideally this would be inside the head, but turbolinks only evaluates page-specific JS in the body.
+  %body{class: "#{user_application_theme}", 'data-page' => body_data_page}
+    -# Ideally this would be inside the head, but turbolinks only evaluates page-specific JS in the body.
     = yield :scripts_body_top
 
     - if current_user

app/views/layouts/errors.html.haml

 !!! 5
 %html{ lang: "en"}
   = render "layouts/head"
-  %body{class: "#{app_theme}  application"}
+  %body{class: "#{user_application_theme} application"}
     = render "layouts/header/empty"
     .container.navless-container
       = render "layouts/flash"

app/views/profiles/preferences/update.js.erb

 // Remove body class for any previous theme, re-add current one
 $('body').removeClass('<%= Gitlab::Themes.body_classes %>')
-$('body').addClass('<%= app_theme %>')
+$('body').addClass('<%= user_application_theme %>')

spec/helpers/application_helper_spec.rb

@@ -185,27 +185,6 @@ describe ApplicationHelper do
     end
   end
 
-  describe 'user_color_scheme_class' do
-    context 'with current_user is nil' do
-      it 'should return a string' do
-        allow(self).to receive(:current_user).and_return(nil)
-        expect(user_color_scheme_class).to be_kind_of(String)
-      end
-    end
-
-    context 'with a current_user' do
-      (1..5).each do |color_scheme_id|
-        context "with color_scheme_id == #{color_scheme_id}" do
-          it 'should return a string' do
-            current_user = double(:color_scheme_id => color_scheme_id)
-            allow(self).to receive(:current_user).and_return(current_user)
-            expect(user_color_scheme_class).to be_kind_of(String)
-          end
-        end
-      end
-    end
-  end
-
   describe 'simple_sanitize' do
     let(:a_tag) { '<a href="#">Foo</a>' }
 

spec/helpers/preferences_helper_spec.rb

+require 'spec_helper'
+
+describe PreferencesHelper do
+  describe 'user_application_theme' do
+    context 'with a user' do
+      it "returns user's theme's css_class" do
+        user = double('user', theme_id: 3)
+        allow(self).to receive(:current_user).and_return(user)
+        expect(user_application_theme).to eq 'ui_green'
+      end
+
+      it 'returns the default when id is invalid' do
+        user = double('user', theme_id: Gitlab::Themes::THEMES.size + 5)
+
+        allow(Gitlab.config.gitlab).to receive(:default_theme).and_return(2)
+        allow(self).to receive(:current_user).and_return(user)
+
+        expect(user_application_theme).to eq 'ui_charcoal'
+      end
+    end
+
+    context 'without a user' do
+      before do
+        allow(self).to receive(:current_user).and_return(nil)
+      end
+
+      it 'returns the default theme' do
+        expect(user_application_theme).to eq Gitlab::Themes.default.css_class
+      end
+    end
+  end
+
+  describe 'user_color_scheme_class' do
+    context 'with current_user is nil' do
+      it 'should return a string' do
+        allow(self).to receive(:current_user).and_return(nil)
+        expect(user_color_scheme_class).to be_kind_of(String)
+      end
+    end
+
+    context 'with a current_user' do
+      (1..5).each do |color_scheme_id|
+        context "with color_scheme_id == #{color_scheme_id}" do
+          it 'should return a string' do
+            current_user = double(:color_scheme_id => color_scheme_id)
+            allow(self).to receive(:current_user).and_return(current_user)
+            expect(user_color_scheme_class).to be_kind_of(String)
+          end
+        end
+      end
+    end
+  end
+end