Add before_headers and after_headers execution position DSL

Author: dnkoutso

CHANGELOG.md

@@ -4,6 +4,10 @@
 
 ##### Enhancements
 
+* Add `before_headers` and `after_headers` execution position DSL.  
+  [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
+  [#686](https://github.com/CocoaPods/Core/pull/686)
+
 * Add a pre_integrate_hook API  
   [David Chavez](https://github.com/dcvz)
   [#643](https://github.com/CocoaPods/Core/pull/643)

lib/cocoapods-core/specification/dsl.rb

@@ -1047,7 +1047,7 @@ def dependency=(args)
       SCRIPT_PHASE_OPTIONAL_KEYS = [:shell_path, :input_files, :output_files, :input_file_lists, :output_file_lists,
                                     :show_env_vars_in_log, :execution_position, :dependency_file].freeze
 
-      EXECUTION_POSITION_KEYS = [:before_compile, :after_compile, :any].freeze
+      EXECUTION_POSITION_KEYS = [:before_compile, :after_compile, :before_headers, :after_headers, :any].freeze
 
       ALL_SCRIPT_PHASE_KEYS = (SCRIPT_PHASE_REQUIRED_KEYS + SCRIPT_PHASE_OPTIONAL_KEYS).freeze
 

spec/podfile/target_definition_spec.rb

@@ -488,7 +488,7 @@ module Pod
       it 'raises if script phase includes an invalid execution position key' do
         e = lambda { @parent.store_script_phase(:name => 'PhaseName', :script => 'echo "Hello World"', :execution_position => :unknown) }.should.raise Podfile::StandardError
         e.message.should == 'Invalid execution position value `unknown` in shell script `PhaseName` within `MyApp` target. ' \
-          'Available options are `[:before_compile, :after_compile, :any]`.'
+          'Available options are `[:before_compile, :after_compile, :before_headers, :after_headers, :any]`.'
       end
 
       it 'raises if the same script phase name already exists' do

spec/specification/consumer_spec.rb

@@ -391,7 +391,7 @@ module Pod
         ]
       end
 
-      it 'returns the empty hash if no script phases have been specified' do
+      it 'returns the empty array if no script phases have been specified' do
         @consumer.script_phases.should == []
       end
     end

spec/specification/linter_spec.rb

@@ -535,7 +535,7 @@ def result_should_include(*values)
       it 'checks script phases include a valid execution position value' do
         @spec.script_phases = { :name => 'Hello World', :script => 'echo "Hello World"', :execution_position => :unknown }
         result_should_include('script_phases', 'Invalid execution position value `unknown` in shell script `Hello World`. ' \
-          'Available options are `before_compile, after_compile, any`.')
+          'Available options are `before_compile, after_compile, before_headers, after_headers, any`.')
       end
 
       #------------------#