Podfile preinstall hook to enerate a header for all headers in Pods targer

preintstall_hook

pre_install do |installer_representation|
	aggregate_target = installer_representation.installer.aggregate_targets.detect { |target| target.name == "Pods" }
	pods = installer_representation.pods.select { |pod| aggregate_target.pod_targets.collect(&:pod_name).include?(pod.name) }
	pod_names = ['AFNetworking']
	File.open('PodHeaders.h', 'w') do |header|
		pods.select {|pod| pod_names.include?(pod.name)}.each do |pod|
			header.puts "\n#pragma mark - " + pod.name + "\n\n"
			pod.source_files.select {|path| path.extname == ".h"}.each do |header_path|
				header_file = header_path.basename.to_s
				next if header_path =~ /Spec/
				header.puts "#import \"#{header_file}\""
			end
		end
	end
end