Rakefile in progress-0.1.1.0 vs Rakefile in progress-0.1.1.1

@@ -1,19 +1,22 @@
+require 'pathname'
 require 'rubygems'
 require 'rake'
 require 'rake/clean'
 require 'fileutils'
 require 'echoe'
 
-version = YAML.load_file(File.join(File.dirname(__FILE__), 'VERSION.yml')).join('.') rescue nil
+version = YAML.load_file(Pathname(__FILE__).dirname + 'VERSION.yml').join('.') rescue nil
 
 echoe = Echoe.new('progress', version) do |p|
   p.author = 'toy'
   p.summary = 'A library to show progress of long running tasks.'
 end
 
 desc "Replace system gem with symlink to this folder"
-task :ghost do
-  path = Gem.searcher.find(echoe.name).full_gem_path
-  system 'sudo', 'rm', '-r', path
-  symlink File.expand_path('.'), path
+task 'ghost' do
+  gem_path = Pathname(Gem.searcher.find(echoe.name).full_gem_path)
+  current_path = Pathname('.').expand_path
+  cmd = gem_path.writable? && gem_path.parent.writable? ? %w() : %w(sudo)
+  system(*cmd + %W[rm -r #{gem_path}])
+  system(*cmd + %W[ln -s #{current_path} #{gem_path}])
 end