development_tools: add installed? method. (#455)

Library/Homebrew/cmd/install.rb

@@ -96,7 +96,7 @@ module Homebrew
 
       # if the user's flags will prevent bottle only-installations when no
       # developer tools are available, we need to stop them early on
-      FormulaInstaller.prevent_build_flags unless MacOS.has_apple_developer_tools?
+      FormulaInstaller.prevent_build_flags unless DevelopmentTools.installed?
 
       ARGV.formulae.each do |f|
         # head-only without --HEAD is an error

Library/Homebrew/cmd/reinstall.rb

@@ -5,7 +5,7 @@ require "formula_installer"
 
 module Homebrew
   def reinstall
-    FormulaInstaller.prevent_build_flags unless MacOS.has_apple_developer_tools?
+    FormulaInstaller.prevent_build_flags unless DevelopmentTools.installed?
 
     ARGV.resolved_formulae.each { |f| reinstall_formula(f) }
   end

Library/Homebrew/cmd/upgrade.rb

@@ -13,7 +13,7 @@ require "cleanup"
 
 module Homebrew
   def upgrade
-    FormulaInstaller.prevent_build_flags unless MacOS.has_apple_developer_tools?
+    FormulaInstaller.prevent_build_flags unless DevelopmentTools.installed?
 
     Homebrew.perform_preinstall_checks
 

Library/Homebrew/compat/macos.rb

@@ -90,5 +90,9 @@ module OS
     def clang_build_version
       DevelopmentTools.clang_build_version
     end
+
+    def has_apple_developer_tools?
+      DevelopmentTools.installed?
+    end
   end
 end

Library/Homebrew/extend/ENV/super.rb

@@ -1,4 +1,5 @@
 require "extend/ENV/shared"
+require "development_tools"
 
 # ### Why `superenv`?
 #
@@ -26,7 +27,7 @@ module Superenv
 
   # @private
   def self.bin
-    return unless MacOS.has_apple_developer_tools?
+    return unless DevelopmentTools.installed?
 
     bin = HOMEBREW_ENV_PATH.subdirs.reject { |d| d.basename.to_s > MacOS::Xcode.version }.max
     bin.realpath unless bin.nil?

Library/Homebrew/extend/os/mac/development_tools.rb

@@ -1,3 +1,5 @@
+require "os/mac/xcode"
+
 # @private
 class DevelopmentTools
   class << self
@@ -13,6 +15,13 @@ class DevelopmentTools
       end
     end
 
+    # Checks if the user has any developer tools installed, either via Xcode
+    # or the CLT. Convenient for guarding against formula builds when building
+    # is impossible.
+    def installed?
+      MacOS::Xcode.installed? || MacOS::CLT.installed?
+    end
+
     def default_compiler
       case default_cc
       # if GCC 4.2 is installed, e.g. via Tigerbrew, prefer it

Library/Homebrew/formula_installer.rb

@@ -178,13 +178,13 @@ class FormulaInstaller
 
     check_conflicts
 
-    if !pour_bottle? && !formula.bottle_unneeded? && !MacOS.has_apple_developer_tools?
+    if !pour_bottle? && !formula.bottle_unneeded? && !DevelopmentTools.installed?
       raise BuildToolsError.new([formula])
     end
 
     unless skip_deps_check?
       deps = compute_dependencies
-      check_dependencies_bottled(deps) if pour_bottle? && !MacOS.has_apple_developer_tools?
+      check_dependencies_bottled(deps) if pour_bottle? && !DevelopmentTools.installed?
       install_dependencies(deps)
     end
 
@@ -223,7 +223,7 @@ class FormulaInstaller
         @pour_failed = true
         onoe e.message
         opoo "Bottle installation failed: building from source."
-        raise BuildToolsError.new([formula]) unless MacOS.has_apple_developer_tools?
+        raise BuildToolsError.new([formula]) unless DevelopmentTools.installed?
       else
         @poured_bottle = true
       end

Library/Homebrew/os/mac.rb

@@ -61,13 +61,6 @@ module OS
       end
     end
 
-    # Checks if the user has any developer tools installed, either via Xcode
-    # or the CLT. Convenient for guarding against formula builds when building
-    # is impossible.
-    def has_apple_developer_tools?
-      Xcode.installed? || CLT.installed?
-    end
-
     def active_developer_dir
       @active_developer_dir ||= Utils.popen_read("/usr/bin/xcode-select", "-print-path").strip
     end

Library/Homebrew/test/test_formula_installer.rb

@@ -62,7 +62,7 @@ class InstallTests < Homebrew::TestCase
   end
 
   def test_bottle_unneeded_formula_install
-    MacOS.stubs(:has_apple_developer_tools?).returns(false)
+    DevelopmentTools.stubs(:installed?).returns(false)
 
     formula = Testball.new
     formula.stubs(:bottle_unneeded?).returns(true)

Library/Homebrew/test/test_formula_installer_bottle.rb

@@ -36,7 +36,7 @@ class InstallBottleTests < Homebrew::TestCase
   end
 
   def test_a_basic_bottle_install
-    MacOS.stubs(:has_apple_developer_tools?).returns(false)
+    DevelopmentTools.stubs(:installed?).returns(false)
 
     temporary_bottle_install(TestballBottle.new) do |f|
       # Copied directly from test_formula_installer.rb as we expect
@@ -59,7 +59,7 @@ class InstallBottleTests < Homebrew::TestCase
   end
 
   def test_build_tools_error
-    MacOS.stubs(:has_apple_developer_tools?).returns(false)
+    DevelopmentTools.stubs(:installed?).returns(false)
 
     # Testball doesn't have a bottle block, so use it to test this behavior
     formula = Testball.new