lib/xcode/install/install.rb in xcode-install-0.0.1 vs lib/xcode/install/install.rb in xcode-install-0.0.2

@@ -1,16 +1,6 @@
 module XcodeInstall
-	class PlainInformative < StandardError
-    	include CLAide::InformativeError
-  	end
-
-	class Informative < PlainInformative
-    	def message
-      		"[!] #{super}".red
-    	end
-  	end
-
 	class Command
 		class Install < Command
 			self.command = 'install'
 			self.summary = 'Install a specific version of Xcode.'
 
@@ -22,9 +12,10 @@
 				@installer = Installer.new
 				@version = argv.shift_argument
 			end
 
 			def validate!
+				raise Informative, "Version #{@version} already installed." if @installer.installed?(@version)
 				raise Informative, "Version #{@version} doesn't exist." unless @installer.exist?(@version)
 			end
 
 			def run
 				dmgPath = @installer.download(@version)
\ No newline at end of file