Fresh start

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diff --git a/jni/ruby/lib/rubygems/commands/yank_command.rb b/jni/ruby/lib/rubygems/commands/yank_command.rb
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+++ b/jni/ruby/lib/rubygems/commands/yank_command.rb
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+require 'rubygems/command'
+require 'rubygems/local_remote_options'
+require 'rubygems/version_option'
+require 'rubygems/gemcutter_utilities'
+
+class Gem::Commands::YankCommand < Gem::Command
+  include Gem::LocalRemoteOptions
+  include Gem::VersionOption
+  include Gem::GemcutterUtilities
+
+  def description # :nodoc:
+    <<-EOF
+The yank command removes a gem you pushed to a server from the server's
+index.
+
+Note that if you push a gem to rubygems.org the yank command does not
+prevent other people from downloading the gem via the download link.
+
+Once you have pushed a gem several downloads will happen automatically
+via the webhooks.  If you accidentally pushed passwords or other sensitive
+data you will need to change them immediately and yank your gem.
+
+If you are yanking a gem due to intellectual property reasons contact
+http://help.rubygems.org for permanant removal.  Be sure to mention this
+as the reason for the removal request.
+    EOF
+  end
+
+  def arguments # :nodoc:
+    "GEM       name of gem"
+  end
+
+  def usage # :nodoc:
+    "#{program_name} GEM -v VERSION [-p PLATFORM] [--undo] [--key KEY_NAME]"
+  end
+
+  def initialize
+    super 'yank', 'Remove a pushed gem from the index'
+
+    add_version_option("remove")
+    add_platform_option("remove")
+
+    add_option('--undo') do |value, options|
+      options[:undo] = true
+    end
+
+    add_key_option
+  end
+
+  def execute
+    sign_in
+
+    version   = get_version_from_requirements(options[:version])
+    platform  = get_platform_from_requirements(options)
+
+    if version then
+      if options[:undo] then
+        unyank_gem(version, platform)
+      else
+        yank_gem(version, platform)
+      end
+    else
+      say "A version argument is required: #{usage}"
+      terminate_interaction
+    end
+  end
+
+  def yank_gem(version, platform)
+    say "Yanking gem from #{self.host}..."
+    yank_api_request(:delete, version, platform, "api/v1/gems/yank")
+  end
+
+  def unyank_gem(version, platform)
+    say "Unyanking gem from #{host}..."
+    yank_api_request(:put, version, platform, "api/v1/gems/unyank")
+  end
+
+  private
+
+  def yank_api_request(method, version, platform, api)
+    name = get_one_gem_name
+    response = rubygems_api_request(method, api) do |request|
+      request.add_field("Authorization", api_key)
+
+      data = {
+        'gem_name' => name,
+        'version' => version,
+      }
+      data['platform'] = platform if platform
+
+      request.set_form_data data
+    end
+    say response.body
+  end
+
+  def get_version_from_requirements(requirements)
+    requirements.requirements.first[1].version
+  rescue
+    nil
+  end
+
+  def get_platform_from_requirements(requirements)
+    Gem.platforms[1].to_s if requirements.key? :added_platform
+  end
+
+end
+