[UI] Redirect cocoapdods-core UI & send warnings to STDERR & improve support in specs.

Gemfile

@@ -8,7 +8,11 @@ gemspec
 group :development do
   gem "cocoapods-core",       :git => "git://github.com/CocoaPods/Core.git"
   gem "xcodeproj",            :git => "git://github.com/CocoaPods/Xcodeproj.git"
-  gem "cocoapods-downloader", :path => '../cocoapods-downloader'
+  gem "cocoapods-downloader", :git => "git://github.com/CocoaPods/cocoapods-downloader"
+
+  # gem "cocoapods-core",       :path => "../Core"
+  # gem "xcodeproj",            :path => "../Xcodeproj"
+  # gem "cocoapods-downloader", :path => "../cocoapods-downloader"
 
   gem "mocha", "~> 0.11.4"
   gem "bacon"

Gemfile.lock

-GIT
-  remote: git://github.com/CocoaPods/Core.git
-  revision: 163c8f3d20aadb91b1987acb57e266ed839040ba
-  specs:
-    cocoapods-core (0.17.0.alpha)
-      activesupport (~> 3.2.6)
-      faraday (~> 0.8.1)
-      octokit (~> 1.7)
-
 GIT
   remote: git://github.com/CocoaPods/Xcodeproj.git
   revision: e3dc945c7fdbbd9f977f6bc14b3e6023b99dc5e1
@@ -15,6 +6,12 @@ GIT
       activesupport (~> 3.2.6)
       colored (~> 1.2)
 
+GIT
+  remote: git://github.com/CocoaPods/cocoapods-downloader
+  revision: 21f5a7b118d4071f21f810694d026c3a4e00df50
+  specs:
+    cocoapods-downloader (0.1.0)
+
 GIT
   remote: https://github.com/alloy/kicker.git
   revision: 6430787ebf8b9305acc2d2f89ae5cf01d2cd5488
@@ -41,9 +38,12 @@ PATH
       xcodeproj (~> 0.4.0)
 
 PATH
-  remote: ../cocoapods-downloader
+  remote: ../Core
   specs:
-    cocoapods-downloader (0.1.0)
+    cocoapods-core (0.17.0.alpha)
+      activesupport (~> 3.2.6)
+      faraday (~> 0.8.1)
+      octokit (~> 1.7)
 
 GEM
   remote: http://rubygems.org/

lib/cocoapods/user_interface.rb

@@ -121,7 +121,7 @@ module Pod
       # return [void]
       #
       def warn(message, actions = [])
-        puts("\n[!] #{message}".yellow)
+        STDERR.puts("\n[!] #{message}".yellow)
         actions.each do |action|
           indented = wrap_string(action, "    - ")
           puts(indented)
@@ -223,4 +223,19 @@ module Pod
     end
   end
   UI = UserInterface
+
+  # Redirect copods-core UI.
+  #
+  module CoreUI
+
+    class << self
+      def puts(message)
+        UI.puts message
+      end
+
+      def warn(message)
+        UI.warn message
+      end
+    end
+  end
 end

spec/spec_helper/user_interface.rb

 module Pod
   module UI
     @output = ''
+    @warnings = ''
 
     class << self
       attr_accessor :output
+      attr_accessor :warnings
 
       def puts(message = '')
         # Wrapping can bite in tests.
         @output << "#{message}".gsub(/\n/,'')
       end
+
+      def warn(message = '', actions = [])
+        # Wrapping can bite in tests.
+        @warnings << "#{message}".gsub(/\n/,'')
+      end
     end
   end
 end

spec/unit/installer/user_project_integrator_spec.rb

@@ -68,7 +68,7 @@ module Pod
       it "warns if the podfile does not contain any dependency" do
         Podfile::TargetDefinition.any_instance.stubs(:empty?).returns(true)
         @integrator.integrate!
-        UI.output.should.include?('The Podfile does not contain any dependency')
+        UI.warnings.should.include?('The Podfile does not contain any dependency')
       end
     end
   end