Add Specification#prefix_header_contents which does not take a pch file, but a…

Add Specification#prefix_header_contents which does not take a pch file, but a string of code to be appended to the Pods pch file.

lib/cocoapods/installer/target_installer.rb

@@ -41,9 +41,11 @@ module Pod
           header.puts "#import #{@target_definition.platform == :ios ? '<UIKit/UIKit.h>' : '<Cocoa/Cocoa.h>'}"
           header.puts "#endif"
           pods.each do |pod|
-            if prefix_header = pod.prefix_header_file
+            if prefix_header_contents = pod.specification.prefix_header_contents
+              header.puts
+              header.puts prefix_header_contents
+            elsif prefix_header = pod.prefix_header_file
               header.puts
-              header.puts "// Pods/#{prefix_header.relative_path_from(pod.sandbox.root)}"
               header.puts prefix_header.read
             end
           end

lib/cocoapods/specification.rb

@@ -98,6 +98,8 @@ module Pod
     end
     attr_reader :prefix_header_file
 
+    attr_accessor :prefix_header_contents
+
     def clean_paths=(patterns)
       @clean_paths = pattern_list(patterns)
     end

spec/unit/installer/target_installer_spec.rb

@@ -61,7 +61,7 @@ describe Pod::Installer::TargetInstaller do
     @installer.xcconfig.to_hash['OTHER_LDFLAGS'].split(" ").should.include("-fobjc-arc")
   end
 
-  it "creates a prefix header, including the contents of the specification's prefix header" do
+  it "creates a prefix header, including the contents of the specification's prefix header file" do
     do_install!
     prefix_header = @sandbox.root + 'Pods.pch'
     @installer.save_prefix_header_as(prefix_header, @pods)
@@ -70,8 +70,21 @@ describe Pod::Installer::TargetInstaller do
 #import <UIKit/UIKit.h>
 #endif
 
-// Pods/BananaLib/Classes/BananaLib.pch
 #import <BananaTree/BananaTree.h>
+EOS
+  end
+
+  it "creates a prefix header, including the contents of the specification's prefix header" do
+    do_install!
+    prefix_header = @sandbox.root + 'Pods.pch'
+    @specification.prefix_header_contents = '#import "BlocksKit.h"'
+    @installer.save_prefix_header_as(prefix_header, @pods)
+    prefix_header.read.should == <<-EOS
+#ifdef __OBJC__
+#import <UIKit/UIKit.h>
+#endif
+
+#import "BlocksKit.h"
 EOS
   end
 end

spec/unit/specification_spec.rb

@@ -228,6 +228,12 @@ describe "A Pod::Specification, in general," do
     @spec.prefix_header_file = 'Classes/Demo.pch'
     @spec.prefix_header_file.should == Pathname.new('Classes/Demo.pch')
   end
+
+  it "takes code that's to be appended to the Pods pch file" do
+    @spec.prefix_header_contents.should == nil
+    @spec.prefix_header_contents = '#import "BlocksKit.h"'
+    @spec.prefix_header_contents.should == '#import "BlocksKit.h"'
+  end
 end
 
 describe "A Pod::Specification subspec" do