+ Redis lib only loaded if the Redis backend is used

server/lib/picky/backends/redis.rb

@@ -9,7 +9,10 @@ class Redis < Backend
       attr_reader :client
 
       def initialize options = {}
+        require 'redis'
         @client = options[:client] || ::Redis.new(:db => (options[:db] || 15))
+      rescue LoadError => e
+        warn_gem_missing 'redis', 'the Redis client'
       end
 
       # Returns an object that on #initial, #load returns an object that responds to:

server/lib/picky/extensions/object.rb

@@ -16,7 +16,7 @@ def exclaim text
   # Puts a text that informs the user of a missing gem.
   #
   def warn_gem_missing gem_name, message
-    warn "#{gem_name} gem missing!\nTo use #{message}, you need to:\n  1. Add the following line to Gemfile:\n     gem '#{gem_name}'\n  2. Then, run:\n     bundle update\n"
+    warn "#{gem_name} gem missing!\nTo use #{message}, you need to:\n  1. Add the following line to Gemfile:\n     gem '#{gem_name}'\n     or\n     require '#{gem_name}'\n     for example on top of your app.rb/application.rb\n  2. Then, run:\n     bundle update\n"
   end
 
   # Indents each line by <tt>amount=2</tt> spaces.

server/spec/lib/extensions/object_spec.rb

@@ -24,7 +24,7 @@
 
     describe 'warn_gem_missing' do
       it 'should warn right' do
-        object.should_receive(:warn).once.with "gnorf gem missing!\nTo use gnarble gnarf, you need to:\n  1. Add the following line to Gemfile:\n     gem 'gnorf'\n  2. Then, run:\n     bundle update\n"
+        object.should_receive(:warn).once.with "gnorf gem missing!\nTo use gnarble gnarf, you need to:\n  1. Add the following line to Gemfile:\n     gem 'gnorf'\n     or\n     require 'gnorf'\n     for example on top of your app.rb/application.rb\n  2. Then, run:\n     bundle update\n"
 
         object.warn_gem_missing 'gnorf', 'gnarble gnarf'
       end

server/spec/lib/sources/delicious_spec.rb

@@ -19,7 +19,7 @@
           @source.should_receive(:require).any_number_of_times.and_raise LoadError
         end
         it "warns & exits" do
-          @source.should_receive(:warn).once.with "www-delicious gem missing!\nTo use the delicious source, you need to:\n  1. Add the following line to Gemfile:\n     gem 'www-delicious'\n  2. Then, run:\n     bundle update\n"
+          @source.should_receive(:warn).once.with "www-delicious gem missing!\nTo use the delicious source, you need to:\n  1. Add the following line to Gemfile:\n     gem 'www-delicious'\n     or\n     require 'www-delicious'\n     for example on top of your app.rb/application.rb\n  2. Then, run:\n     bundle update\n"
           @source.should_receive(:exit).once.with 1
 
           @source.check_gem

server/test_project/app/application.rb

@@ -1,5 +1,6 @@
 # encoding: utf-8
 #
+require 'redis'
 require File.expand_path '../logging', __FILE__
 
 class ChangingItem