move default builder classes into Rscons::Builders namespace module

lib/rscons.rb

@@ -14,9 +14,9 @@ require "rscons/builders/program"
 # Namespace module for rscons classes
 module Rscons
   DEFAULT_BUILDERS = [
-    Library,
+    :Library,
-    Object,
+    :Object,
-    Program,
+    :Program,
   ]
 
   class BuildError < RuntimeError; end

lib/rscons/builder.rb

@@ -1,6 +1,9 @@
 require "fileutils"
 
 module Rscons
+  # Namespace module in which to store builders for convenient grouping
+  module Builders; end
+
   # Class to hold an object that knows how to build a certain type of file.
   class Builder
     # Return the name of the builder.

lib/rscons/builders/library.rb

@@ -1,8 +1,7 @@
-require 'fileutils'
-
 module Rscons
+  module Builders
     # A default RScons builder that produces a static library archive.
-  class Library < Builder
+    class Rscons::Builders::Library < Rscons::Builder
       def default_variables(env)
         {
           'AR' => 'ar',
@@ -26,3 +25,4 @@ module Rscons
       end
     end
   end
+end

lib/rscons/builders/object.rb

@@ -1,4 +1,5 @@
 module Rscons
+  module Builders
     # A default RScons builder which knows how to produce an object file from
     # various types of source files.
     class Object < Builder
@@ -77,3 +78,4 @@ module Rscons
       end
     end
   end
+end

lib/rscons/builders/program.rb

@@ -1,7 +1,8 @@
 module Rscons
+  module Builders
     # A default RScons builder that knows how to link object files into an
     # executable program.
-  class Program < Builder
+    class Rscons::Builders::Program < Rscons::Builder
       def default_variables(env)
         {
           'LD' => nil,
@@ -37,3 +38,4 @@ module Rscons
       end
     end
   end
+end

lib/rscons/environment.rb

@@ -34,7 +34,9 @@ module Rscons
       @build_dirs = []
       @build_hooks = []
       unless options[:exclude_builders]
-        DEFAULT_BUILDERS.each do |builder_class|
+        DEFAULT_BUILDERS.each do |builder_class_name|
+          builder_class = Builders.const_get(builder_class_name)
+          builder_class or raise "Could not find builder class #{builder_class_name}"
           add_builder(builder_class.new)
         end
       end

spec/rscons/environment_spec.rb

@@ -48,7 +48,7 @@ module Rscons
       it "adds the builder to the list of builders" do
         env = Environment.new(exclude_builders: true)
         env.builders.keys.should == []
-        env.add_builder(Rscons::Object.new)
+        env.add_builder(Rscons::Builders::Object.new)
         env.builders.keys.should == ["Object"]
       end
     end