Refactor Xcode/CLT version checks

Library/Homebrew/cmd/doctor.rb

@@ -215,33 +215,38 @@ def check_for_broken_symlinks
   end
 end
 
-def check_for_latest_xcode
-  if not MacOS::Xcode.installed?
-    if MacOS.version >= 10.7
-      if not MacOS::CLT.installed?
-        <<-EOS.undent
-        No developer tools installed
-        You should install the Command Line Tools: http://connect.apple.com
-        EOS
-      elsif not MacOS::CLT.latest_version?
-        <<-EOS.undent
-        A newer Command Line Tools for Xcode release is available
-        You should install the latest version from: http://connect.apple.com
-        EOS
-      end
-    else
-      <<-EOS.undent
-      Xcode not installed
-      Most stuff needs Xcode to build: http://developer.apple.com/xcode/
-      EOS
-    end
-  elsif MacOS::Xcode.version < MacOS::Xcode.latest_version then <<-EOS.undent
+def check_xcode_clt
+  if MacOS::Xcode.installed?
+    __check_xcode_up_to_date
+  elsif MacOS.version >= 10.7
+    __check_clt_up_to_date
+  else <<-EOS.undent
+    Xcode not installed
+    Most stuff needs Xcode to build: http://developer.apple.com/xcode/
+    EOS
+  end
+end
+
+def __check_xcode_up_to_date
+  if MacOS::Xcode.outdated? then <<-EOS.undent
     Your Xcode (#{MacOS::Xcode.version}) is outdated
     Please install Xcode #{MacOS::Xcode.latest_version}.
     EOS
   end
 end
 
+def __check_clt_up_to_date
+  if not MacOS::CLT.installed? then <<-EOS.undent
+    No developer tools installed
+    You should install the Command Line Tools: http://connect.apple.com
+    EOS
+  elsif MacOS::CLT.outdated? then <<-EOS.undent
+    A newer Command Line Tools for Xcode release is available
+    You should install the latest version from: http://connect.apple.com
+    EOS
+  end
+end
+
 def check_for_stray_developer_directory
   # if the uninstaller script isn't there, it's a good guess neither are
   # any troublesome leftover Xcode files
@@ -271,7 +276,7 @@ def check_cc
 end
 
 def check_standard_compilers
-  return if check_for_latest_xcode # only check if Xcode is up to date
+  return if check_xcode_clt # only check if Xcode is up to date
   compiler_status = MacOS.compilers_standard?
   if not compiler_status and not compiler_status.nil? then <<-EOS.undent
     Your compilers are different from the standard versions for your Xcode.

Library/Homebrew/cmd/install.rb

@@ -42,7 +42,7 @@ module Homebrew extend self
   def check_xcode
     require 'cmd/doctor'
     checks = Checks.new
-    %w{check_for_latest_xcode check_xcode_license_approved}.each do |check|
+    %w{check_xcode_clt check_xcode_license_approved}.each do |check|
       out = checks.send(check)
       opoo out unless out.nil?
     end

Library/Homebrew/os/mac/xcode.rb

@@ -19,17 +19,18 @@ module MacOS::Xcode extend self
 
   def latest_version
     case MacOS.version
-      when 10.5 then "3.1.4"
-      when 10.6 then "3.2.6"
+    when 10.5       then "3.1.4"
+    when 10.6       then "3.2.6"
+    when 10.7..10.8 then "4.6.2"
     else
-      if MacOS.version >= 10.7
-        "4.6.2"
-      else
-        raise "Mac OS X `#{MacOS.version}' is invalid"
-      end
+      raise "Mac OS X '#{MacOS.version}' is invalid"
     end
   end
 
+  def outdated?
+    version < latest_version
+  end
+
   def prefix
     @prefix ||= begin
       path = Pathname.new(folder)
@@ -158,6 +159,10 @@ module MacOS::CLT extend self
     $1.to_i >= 425 and $3.to_i >= 28
   end
 
+  def outdated?
+    !latest_version?
+  end
+
   def version
     # The pkgutils calls are slow, don't repeat if no CLT installed.
     return @version if @version_determined