Fix widget install and uninstall using hardlinks.

lib/cask/artifact.rb

@@ -2,6 +2,7 @@ module Cask::Artifact; end
 
 require 'cask/artifact/base'
 require 'cask/artifact/symlinked'
+require 'cask/artifact/hardlinked'
 
 require 'cask/artifact/app'
 require 'cask/artifact/block'

lib/cask/artifact/hardlinked.rb

@@ -0,0 +1,18 @@
+class Cask::Artifact::Hardlinked < Cask::Artifact::Symlinked
+  def islink?(path)
+    return false unless path.respond_to?(:stat)
+    path.stat.nlink > 1
+  end
+
+  def link_action(source, target)
+    File.link(source, target)
+  end
+
+  def unlink_action(target)
+    FileUtils.rm_rf target
+  end
+
+  def link_name
+    'hardlink'
+  end
+end

lib/cask/artifact/symlinked.rb

@@ -1,17 +1,35 @@
 class Cask::Artifact::Symlinked < Cask::Artifact::Base
+  def islink?(path)
+    path.symlink?
+  end
+
+  def link_action(source, target)
+    @command.run!('/bin/ln', :args => ['-hfs', source, target])
+  end
+
+  def unlink_action(target)
+    target.delete
+  end
+
+  def link_name
+    'symlink'
+  end
+
   def link(artifact_relative_path)
     source = @cask.destination_path.join(artifact_relative_path)
-    target = Cask.send(self.class.artifact_dirmethod).join(source.basename)
+    target_dir = Cask.send(self.class.artifact_dirmethod)
+    Dir.mkdir(target_dir) unless target_dir.exist?
+    target = target_dir.join(source.basename)
     return unless preflight_checks(source, target)
     ohai "Linking #{self.class.artifact_english_name} '#{source.basename}' to '#{target}'"
-    @command.run!('/bin/ln', :args => ['-hfs', source, target])
+    self.link_action(source, target)
   end
 
   def unlink(artifact_relative_path)
     linked_path = Cask.send(self.class.artifact_dirmethod).join(Pathname(artifact_relative_path).basename)
-    if linked_path.exist? && linked_path.symlink?
+    if linked_path.exist? && self.islink?(linked_path)
       ohai "Removing #{self.class.artifact_english_name} link: '#{linked_path}'"
-      linked_path.delete
+      self.unlink_action(linked_path)
     end
   end
 
@@ -24,12 +42,12 @@ def uninstall
   end
 
   def preflight_checks(source, target)
-    if target.exist? && !target.symlink?
+    if target.exist? && !self.islink?(target)
       ohai "It seems there is already #{self.class.artifact_english_article} #{self.class.artifact_english_name} at '#{target}'; not linking."
       return false
     end
     unless source.exist?
-      raise "it seems the symlink source is not there: '#{source}'"
+      raise "it seems the #{self.link_name} source is not there: '#{source}'"
     end
     true
   end

lib/cask/artifact/widget.rb

@@ -1,2 +1,2 @@
-class Cask::Artifact::Widget < Cask::Artifact::Symlinked
+class Cask::Artifact::Widget < Cask::Artifact::Hardlinked
 end