gem (tasks) push rewrite + bugfix

lib/kamaze/project/tasks/gem/push.rb

@@ -6,22 +6,21 @@
 # This is free software: you are free to change and redistribute it.
 # There is NO WARRANTY, to the extent permitted by law.
 
-[nil, :gem_runner, :exceptions].each do |req|
-  require "rubygems/#{req}".rstrip('/')
-end
-
-# Code mostly based on gem executable
-#
-# @see http://guides.rubygems.org/publishing/
-# @see rubygems-tasks
-builder = tools.fetch(:gemspec_builder)
-desc 'Push gem up to the gem server'
-task 'gem:push': [builder.buildable] do
-  args = [:push, builder.buildable].map(&:to_s)
+[nil, :gem_runner, :exceptions].each { |req| require ['rubygems', req].compact.join('/') }
 
-  begin
-    Gem::GemRunner.new.run(args.map(&:to_s))
-  rescue Gem::SystemExitException => e
-    exit(e.exit_code)
+tools.fetch(:gemspec_builder).tap do |builder|
+  # Code mostly based on gem executable
+  #
+  # @see http://guides.rubygems.org/publishing/
+  # @see rubygems-tasks
+  runner = lambda do
+    [:push, builder.buildable].map(&:to_s).yield_self do |args|
+      Gem::GemRunner.new.run(args.map(&:to_s))
+    rescue Gem::SystemExitException => e
+      exit(e.exit_code)
+    end
   end
+
+  desc 'Push gem up to the gem server'
+  task('gem:push': [builder.buildable]) { runner.call }
 end