Move BuildOptions to a separate file

1 files changed, 74 insertions, 0 deletions

diff --git a/Library/Homebrew/build_options.rb b/Library/Homebrew/build_options.rb
new file mode 100644
index 000000000..d0b1f0469
--- /dev/null
+++ b/Library/Homebrew/build_options.rb
@@ -0,0 +1,74 @@
+require 'options'
+
+# This class holds the build-time options defined for a Formula,
+# and provides named access to those options during install.
+class BuildOptions
+  attr_writer :args
+  include Enumerable
+
+  def initialize args
+    @args = Array.new(args).extend(HomebrewArgvExtension)
+    @options = Options.new
+  end
+
+  def add name, description=nil
+    description ||= case name.to_s
+      when "universal" then "Build a universal binary"
+      when "32-bit" then "Build 32-bit only"
+      end.to_s
+
+    @options << Option.new(name, description)
+  end
+
+  def has_option? name
+    any? { |opt| opt.name == name }
+  end
+
+  def empty?
+    @options.empty?
+  end
+
+  def each(*args, &block)
+    @options.each(*args, &block)
+  end
+
+  def as_flags
+    @options.as_flags
+  end
+
+  def include? name
+    @args.include? '--' + name
+  end
+
+  def head?
+    @args.flag? '--HEAD'
+  end
+
+  def devel?
+    @args.include? '--devel'
+  end
+
+  def stable?
+    not (head? or devel?)
+  end
+
+  # True if the user requested a universal build.
+  def universal?
+    @args.include?('--universal') && has_option?('universal')
+  end
+
+  # Request a 32-bit only build.
+  # This is needed for some use-cases though we prefer to build Universal
+  # when a 32-bit version is needed.
+  def build_32_bit?
+    @args.include?('--32-bit') && has_option?('32-bit')
+  end
+
+  def used_options
+    Options.new((as_flags & @args.options_only).map { |o| Option.new(o) })
+  end
+
+  def unused_options
+    Options.new((as_flags - @args.options_only).map { |o| Option.new(o) })
+  end
+end