Add rake task that dumps a Xcode project as YAML.

Rakefile

@@ -76,5 +76,37 @@ namespace :spec do
   end
 end
 
+desc "Dumps a Xcode project as YAML, meant for diffing"
+task :dump_xcodeproj do
+  require 'yaml'
+  hash = NSDictionary.dictionaryWithContentsOfFile(File.join(ENV['xcodeproj'], 'project.pbxproj'))
+  objects = hash['objects']
+  result = objects.values.map do |object|
+    if children = object['children']
+      object['children'] = children.map do |uuid|
+        child = objects[uuid]
+        child['path'] || child['name']
+      end.sort
+    elsif files = object['files']
+      object['files'] = files.map do |uuid|
+        build_file = objects[uuid]
+        file = objects[build_file['fileRef']]
+        file['path']
+      end
+    elsif file_ref = object['fileRef']
+      file = objects[file_ref]
+      object['file'] = file['path']
+    end
+    object
+  end
+  result.each do |object|
+    object.delete('fileRef')
+  end
+  result = result.sort_by do |object|
+    [object['isa'], object['file'], object['path'], object['name']].compact
+  end
+  puts result.to_yaml
+end
+
 desc "Run all specs"
 task :spec => 'spec:all'