From 3ba3111a45fa02085b187a774d1ddd2ab3a0d672 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sun, 30 Jun 2013 19:26:09 -0400
Subject: [PATCH] add functionality to add builders to an Environment

---
 lib/rscons.rb                  |  8 ++++++++
 lib/rscons/builders/cc.rb      |  4 ++++
 lib/rscons/builders/program.rb |  4 ++++
 lib/rscons/environment.rb      | 32 ++++++++++++++++++++++++++++++++
 lib/rscons/monkey/module.rb    |  5 +++++
 5 files changed, 53 insertions(+)
 create mode 100644 lib/rscons/builders/cc.rb
 create mode 100644 lib/rscons/builders/program.rb
 create mode 100644 lib/rscons/monkey/module.rb

diff --git a/lib/rscons.rb b/lib/rscons.rb
index 3763eb0..c543e0d 100644
--- a/lib/rscons.rb
+++ b/lib/rscons.rb
@@ -2,7 +2,15 @@ require "rscons/builder"
 require "rscons/environment"
 require "rscons/version"
 
+require "rscons/monkey/module"
+
+# default builders
+require "rscons/builders/cc"
+require "rscons/builders/program"
+
 module Rscons
   DEFAULT_BUILDERS = [
+    CC,
+    Program,
   ]
 end
diff --git a/lib/rscons/builders/cc.rb b/lib/rscons/builders/cc.rb
new file mode 100644
index 0000000..a27c64b
--- /dev/null
+++ b/lib/rscons/builders/cc.rb
@@ -0,0 +1,4 @@
+module Rscons
+  class CC < Builder
+  end
+end
diff --git a/lib/rscons/builders/program.rb b/lib/rscons/builders/program.rb
new file mode 100644
index 0000000..4dd9414
--- /dev/null
+++ b/lib/rscons/builders/program.rb
@@ -0,0 +1,4 @@
+module Rscons
+  class Program < Builder
+  end
+end
diff --git a/lib/rscons/environment.rb b/lib/rscons/environment.rb
index 41c8e56..23c9c6d 100644
--- a/lib/rscons/environment.rb
+++ b/lib/rscons/environment.rb
@@ -21,9 +21,41 @@ module Rscons
     #   which are lowercase symbols (such as :echo).
     def initialize(variables = {})
       @variables = variables
+      @targets = {}
+      @builders = {}
+      @variables[:exclude_builders] ||= []
+      unless @variables[:exclude_builders] == :all
+        exclude_builders = Set.new(@variables[:exclude_builders] || [])
+        DEFAULT_BUILDERS.each do |builder_class|
+          unless exclude_builders.include?(builder_class.short_name)
+            add_builder(builder_class)
+          end
+        end
+      end
+      (@variables[:builders] || []).each do |builder_class|
+        add_builder(builder_class)
+      end
+    end
+
+    def add_builder(builder_class)
+      @builders[builder_class.short_name] = builder_class
     end
 
     def process
     end
+
+    alias_method :orig_method_missing, :method_missing
+    def method_missing(method, *args)
+      if @builders.has_key?(method.to_s)
+        target, source, *rest = args
+        @targets[target] = {
+          builder: method.to_s,
+          source: source,
+          args: rest,
+        }
+      else
+        orig_method_missing(method, *args)
+      end
+    end
   end
 end
diff --git a/lib/rscons/monkey/module.rb b/lib/rscons/monkey/module.rb
new file mode 100644
index 0000000..eda3d0e
--- /dev/null
+++ b/lib/rscons/monkey/module.rb
@@ -0,0 +1,5 @@
+class Module
+  def short_name
+    name.split(':').last
+  end
+end