brew-linkapps - expand the target path once.

Library/Contributions/examples/brew-linkapps.rb

 # Links any Applications (.app) found in installed prefixes to ~/Applications
 require "formula"
 
-unless File.exist? File.expand_path("~/Applications")
-  opoo File.expand_path("~/Applications")+" does not exist, stopping."
+HOME_APPS = File.expand_path("~/Applications")
+
+unless File.exist? HOME_APPS
+  opoo "#{HOME_APPS} does not exist, stopping."
   exit 1
 end
 
@@ -14,7 +16,7 @@ HOMEBREW_CELLAR.subdirs.each do |keg|
     Dir["#{f.prefix}/*.app"].each do |p|
       puts "Linking #{p}"
       appname = File.basename(p)
-      target = File.expand_path("~/Applications")+"/"+appname
+      target = HOME_APPS+"/"+appname
       if File.exist? target
         if File.symlink? target
           system "rm", target
@@ -22,7 +24,7 @@ HOMEBREW_CELLAR.subdirs.each do |keg|
           onoe "#{target} already exists, skipping."
         end
       end
-      system "ln", "-s", p, File.expand_path("~/Applications")
+      system "ln", "-s", p, HOME_APPS
     end
   end
 end