Add ipc command `podfile_json` converts a Podfile to JSON

CHANGELOG.md

@@ -32,6 +32,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
   [Austin Emmons](https://github.com/atreat)
   [#6742](https://github.com/CocoaPods/CocoaPods/issues/6742) 
 
+* Add ipc command `podfile_json` converts a Podfile to JSON  
+  [Dacaiguoguo](https://github.com/dacaiguoguogmail)
+  [#6779](https://github.com/CocoaPods/CocoaPods/pull/6779)
+
 ##### Bug Fixes
 
 * Do not double add search paths to test xcconfig from parent  

lib/cocoapods/command/ipc.rb

 require 'cocoapods/command/ipc/list'
 require 'cocoapods/command/ipc/podfile'
+require 'cocoapods/command/ipc/podfile_json'
 require 'cocoapods/command/ipc/repl'
 require 'cocoapods/command/ipc/spec'
 require 'cocoapods/command/ipc/update_search_index'

lib/cocoapods/command/ipc/podfile_json.rb

+module Pod
+  class Command
+    class IPC < Command
+      class PodfileJSON < IPC
+        include ProjectDirectory
+
+        self.summary = 'Converts a Podfile to JSON'
+        self.description = 'Converts a Podfile to JSON and prints it to STDOUT.'
+        self.arguments = [
+          CLAide::Argument.new('PATH', true),
+        ]
+
+        def initialize(argv)
+          @path = argv.shift_argument
+          super
+        end
+
+        def validate!
+          super
+          help! 'A Podfile path is required.' unless @path
+        end
+
+        def run
+          podfile = Pod::Podfile.from_file(@path)
+          output_pipe.puts podfile.to_hash.to_json
+        end
+      end
+    end
+  end
+end

spec/functional/command/ipc/podfile_json_spec.rb

+require File.expand_path('../../../../spec_helper', __FILE__)
+
+module Pod
+  describe Command::IPC::PodfileJSON do
+    before do
+      Command::IPC::PodfileJSON.any_instance.stubs(:output_pipe).returns(UI)
+    end
+
+    it 'converts a Podfile to JSON and prints it to STDOUT' do
+      out = run_command('ipc', 'podfile-json', fixture('Podfile'))
+      parsed_hash = JSON.parse(out)
+      parsed_hash.should == { 'target_definitions' => [{ 'name' => 'Pods', 'abstract' => true, 'platform' => 'ios', 'dependencies' => [{ 'SSZipArchive' => ['>= 1'] }, { 'ASIHTTPRequest' => ['~> 1.8.0'] }, 'Reachability', { 'ASIWebPageRequest' => ['< 1.8.2'] }] }] }
+    end
+  end
+end