brew -c1 one line configuration summary

At your option: `brew --config -1`.

Library/Homebrew/cmd/--config.rb

@@ -2,8 +2,12 @@ require 'hardware'
 
 module Homebrew extend self
   def __config
+    if ARGV.first == '-1'
+      dump_c1
+    else
       puts config_s
     end
+  end
 
   def llvm
     @llvm ||= MacOS.llvm_build_version
@@ -134,4 +138,22 @@ module Homebrew extend self
     Which Ruby:   #{describe_ruby}
     EOS
   end
+
+  def dump_c1
+    stuff = []
+    print "#{HOMEBREW_PREFIX}-#{HOMEBREW_VERSION} "
+    print MACOS_FULL_VERSION
+    print "-#{kernel}" if MacOS.version < :lion
+    print ' '
+    if MacOS::Xcode.version > "4.3"
+      print MacOS::Xcode.prefix unless MacOS::Xcode.prefix.to_s =~ %r{^/Applications/Xcode.app}
+    else
+      print MacOS::Xcode.prefix unless MacOS::Xcode.prefix.to_s =~ %r{^/Developer}
+    end
+    print "#{MacOS::Xcode.version}"
+    print "-noclt" unless MacOS::CLT.installed?
+    print " clang-#{clang_build} llvm-#{llvm} "
+    print "#{MacOS::XQuartz.prefix}-#{MacOS::XQuartz.version}" if MacOS::XQuartz.prefix
+    puts
+  end
 end

bin/brew

@@ -76,6 +76,11 @@ begin
   cmd = ARGV.shift
   cmd = aliases[cmd] if aliases[cmd]
 
+  if cmd == '-c1'
+    cmd = '--config'
+    ARGV.unshift('-1')
+  end
+
   # Add example external commands to PATH before checking.
   ENV['PATH'] += ":#{HOMEBREW_REPOSITORY}/Library/Contributions/cmds"
   if which "brew-#{cmd}"