Extract "brew_install".

This was supposed to go in with the "brew-upgrade" external command,
but must have been lost in the merge.

Library/Homebrew/brew.h.rb

@@ -418,6 +418,51 @@ def search_brews text
   end
 end
 
+def brew_install
+  require 'formula_installer'
+  require 'hardware'
+
+  ############################################################ sanity checks
+  case Hardware.cpu_type when :ppc, :dunno
+    abort "Sorry, Homebrew does not support your computer's CPU architecture.\n"+
+          "For PPC support, see: http://github.com/sceaga/homebrew/tree/powerpc"
+  end
+
+  raise "Cannot write to #{HOMEBREW_CELLAR}" if HOMEBREW_CELLAR.exist? and not HOMEBREW_CELLAR.writable?
+  raise "Cannot write to #{HOMEBREW_PREFIX}" unless HOMEBREW_PREFIX.writable?
+
+  ################################################################# warnings
+  begin
+    if MACOS_VERSION >= 10.6
+      opoo "You should upgrade to Xcode 3.2.1" if llvm_build < RECOMMENDED_LLVM
+    else
+      opoo "You should upgrade to Xcode 3.1.4" if (gcc_40_build < RECOMMENDED_GCC_40) or (gcc_42_build < RECOMMENDED_GCC_42)
+    end
+  rescue
+    # the reason we don't abort is some formula don't require Xcode
+    # TODO allow formula to declare themselves as "not needing Xcode"
+    opoo "Xcode is not installed! Builds may fail!"
+  end
+
+  if macports_or_fink_installed?
+    opoo "It appears you have Macports or Fink installed"
+    puts "Although, unlikely, this can break builds or cause obscure runtime issues."
+    puts "If you experience problems try uninstalling these tools."
+  end
+
+  ################################################################# install!
+  installer = FormulaInstaller.new
+  installer.install_deps = !ARGV.include?('--ignore-dependencies')
+
+  ARGV.formulae.each do |f|
+    if not f.installed? or ARGV.force?
+      installer.install f
+    else
+      puts "Formula already installed: #{f.prefix}"
+    end
+  end
+end
+
 ########################################################## class PrettyListing
 class PrettyListing
   def initialize path

bin/brew

@@ -259,49 +259,7 @@ begin
 
   when 'install'
     check_for_blacklisted_formula(ARGV.named)
-    
-    require 'formula_installer'
-    require 'hardware'
-
-    ############################################################ sanity checks
-    case Hardware.cpu_type when :ppc, :dunno
-      abort "Sorry, Homebrew does not support your computer's CPU architecture.\n"+
-            "For PPC support, see: http://github.com/sceaga/homebrew/tree/powerpc"
-    end
-
-    raise "Cannot write to #{HOMEBREW_CELLAR}" if HOMEBREW_CELLAR.exist? and not HOMEBREW_CELLAR.writable?
-    raise "Cannot write to #{HOMEBREW_PREFIX}" unless HOMEBREW_PREFIX.writable?
-
-    ################################################################# warnings
-    begin
-      if MACOS_VERSION >= 10.6
-        opoo "You should upgrade to Xcode 3.2.1" if llvm_build < RECOMMENDED_LLVM
-      else
-        opoo "You should upgrade to Xcode 3.1.4" if (gcc_40_build < RECOMMENDED_GCC_40) or (gcc_42_build < RECOMMENDED_GCC_42)
-      end
-    rescue
-      # the reason we don't abort is some formula don't require Xcode
-      # TODO allow formula to declare themselves as "not needing Xcode"
-      opoo "Xcode is not installed! Builds may fail!"
-    end
-
-    if macports_or_fink_installed?
-      opoo "It appears you have Macports or Fink installed"
-      puts "Although, unlikely, this can break builds or cause obscure runtime issues."
-      puts "If you experience problems try uninstalling these tools."
-    end
-
-    ################################################################# install!
-    installer = FormulaInstaller.new
-    installer.install_deps = !ARGV.include?('--ignore-dependencies')
-
-    ARGV.formulae.each do |f|
-      if not f.installed? or ARGV.force?
-        installer.install f
-      else
-        puts "Formula already installed: #{f.prefix}"
-      end
-    end
+    brew_install
 
   when 'log'
     Dir.chdir HOMEBREW_REPOSITORY