use hard links for fonts instead of symlinks

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/font.rb

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

lib/cask/artifact/hardlinked.rb

@@ -0,0 +1,14 @@
+class Cask::Artifact::Hardlinked < Cask::Artifact::Symlinked
+  def self.islink?(path)
+    return false unless path.respond_to?(:stat)
+    path.stat.nlink > 1
+  end
+
+  def self.link_type_english_name
+    'Hardlink'
+  end
+
+  def create_filesystem_link(source, target)
+    @command.run!('/bin/ln', :args => ['-hf', source, target])
+  end
+end

lib/cask/artifact/symlinked.rb

@@ -1,16 +1,28 @@
 class Cask::Artifact::Symlinked < Cask::Artifact::Base
+  def self.islink?(path)
+    path.symlink?
+  end
+
+  def self.link_type_english_name
+    'Symlink'
+  end
+
+  def create_filesystem_link(source, target)
+    @command.run!('/bin/ln', :args => ['-hfs', source, target])
+  end
+
   def link(artifact_relative_path)
     source = @cask.destination_path.join(artifact_relative_path)
     target = Cask.send(self.class.artifact_dirmethod).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])
+    ohai "#{self.class.link_type_english_name}ing #{self.class.artifact_english_name} '#{source.basename}' to '#{target}'"
+    create_filesystem_link(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?
-      ohai "Removing #{self.class.artifact_english_name} link: '#{linked_path}'"
+    if linked_path.exist? && self.class.islink?(linked_path)
+      ohai "Removing #{self.class.artifact_english_name} #{self.class.link_type_english_name.downcase}: '#{linked_path}'"
       linked_path.delete
     end
   end
@@ -24,12 +36,12 @@ def uninstall
   end
 
   def preflight_checks(source, target)
-    if target.exist? && !target.symlink?
+    if target.exist? && !self.class.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.class.link_type_english_name.downcase} source is not there: '#{source}'"
     end
     true
   end

test/cask/artifact/app_test.rb

@@ -83,7 +83,7 @@
 
       TestHelper.must_output(self, lambda {
         Cask::Artifact::App.new(cask).install
-      }, "==> Linking App 'Caffeine.app' to '#{Cask.appdir.join('Caffeine.app')}'")
+      }, "==> Symlinking App 'Caffeine.app' to '#{Cask.appdir.join('Caffeine.app')}'")
 
       File.readlink(Cask.appdir/'Caffeine.app').wont_equal '/tmp'
     end