Add support for multiple Xcode subprojects per spec

Because it makes sense.

lib/cocoapods/installer/linked_dependencies_installer.rb

@@ -63,11 +63,9 @@ module Pod
       # @return [void]
       #
       def add_libraries_to_target
-        pod_target.spec_consumers.each do |consumer|
-          xcodeproj = consumer.xcodeproj
-
-          next unless xcodeproj['project']
-
+        pod_target.spec_consumers.map do |consumer|
+          xcodeprojs_from_consumer(consumer)
+        end.flatten.each do |xcodeproj|
           linked_project = open_linked_xcode_project(xcodeproj['project'])
 
           # Hide the schemes that would be autogenerated for the subproject's targets.
@@ -142,15 +140,13 @@ module Pod
       def linked_project_specs
         specs_by_path = {}
 
-        pod_target.spec_consumers.each do |consumer|
-          proj = consumer.xcodeproj
-
-          next unless proj.present?
-
-          absolute_path = pod_root + proj['project']
+        pod_target.spec_consumers.map do |consumer|
+          xcodeprojs_from_consumer(consumer).each do |proj|
+            absolute_path = pod_root + proj['project']
 
-          specs_by_path[absolute_path] ||= []
-          specs_by_path[absolute_path] << consumer.spec
+            specs_by_path[absolute_path] ||= []
+            specs_by_path[absolute_path] << consumer.spec
+          end
         end
 
         specs_by_path
@@ -177,6 +173,30 @@ module Pod
         target
       end
 
+      # Takes a Consumer and extracts an array of xcodeproj descriptors.
+      #
+      # @param [Specification::Consumer] consumer The consumer to take xcodeprojs from
+      #
+      # @return [Array<Hash>] A list of valid xcodeproj specifications
+      #
+      def xcodeprojs_from_consumer(consumer)
+        xcodeprojs = consumer.xcodeprojs
+        xcodeprojs = [] if xcodeprojs.nil?
+        xcodeprojs = [xcodeprojs] if xcodeprojs.kind_of?(Hash)
+
+        xcodeprojs = xcodeprojs.map do |xcodeproj|
+          xcodeproj.inject({}) { |memo, (k,v)| memo[k.to_s] = v; memo }
+        end
+
+        xcodeprojs.each do |xcodeproj|
+          unless xcodeproj.has_key?('project')
+            raise Informative, "Missing project parameter to xcodeproj specification: #{xcodeproj.inspect}"
+          end
+        end
+
+        xcodeprojs
+      end
+
       # @return [String] the path where the pod target's specification is
       #         defined, if loaded from a file. (May be nil)
       #

lib/cocoapods/installer/pod_source_installer.rb

@@ -232,7 +232,7 @@ module Pod
       #
       def clean_paths
         has_xcodeproj = specs_by_platform.any? do |platform, specs|
-          specs.any? { |spec| spec.consumer(platform).xcodeproj.present? }
+          specs.any? { |spec| spec.consumer(platform).xcodeprojs.present? }
         end
 
         return [] if has_xcodeproj

spec/unit/installer/linked_dependencies_installer_spec.rb

@@ -145,6 +145,20 @@ module Pod
       end.message.should.match /Could not find native target/
     end
 
+    it "extracts a single xcodeproj from a consumer object" do
+      spec = @file_accessor.spec
+      spec.xcodeproj = { :project => 'hello' }
+      @installer.send(:xcodeprojs_from_consumer, spec.consumer(:ios)).should.be == [{ "project" => "hello" }]
+    end
+
+    it "extracts two xcodeprojs from a consumer object" do
+      spec = @file_accessor.spec
+      spec.xcodeprojs = [{ :project => 'hello' }, { 'project' => 'hello2' }]
+
+      xcodeprojs = @installer.send(:xcodeprojs_from_consumer, spec.consumer(:ios))
+      xcodeprojs.should.be == [{ "project" => "hello" }, { "project" => "hello2" }]
+    end
+
     it "finds the spec file path correctly" do
       @installer.send(:spec_file).should.be == @file_accessor.spec.defined_in_file
     end