Add rvm sources directory if available.

lib/qwandry/configuration.rb

@@ -14,9 +14,16 @@ module Qwandry
         builders[name] << block
       end
       
+      # Registers a configuration is a specific binary is available.  If `binary` is not specified,
+      # it is assumed to be the same as the configuration name.
       def register_if_present name, binary=nil, &block
         binary ||= name
-        register(name, &block) if system("which #{binary}")
+        register(name, &block) if present? binary
+      end
+      
+      # Returns true if binary `name` is present.
+      def present? name
+        system("which #{name}", STDOUT=>"/dev/null")
       end
       
       # Sets the default configuration to launch, if no `configurations` are passed

lib/qwandry/configuration/default.rb

@@ -52,6 +52,16 @@ register_if_present :node do
   add node_paths
 end
 
+# If we can figure out where the user's ruby source directory is, add it.
+register_if_present :ruby_src, :rvm do
+  # If present, use the current rvm's ruby source, this will probably be MRI
+  # though you never know.  We could later try to be smarter about jruby, etc.
+  path = File.join(ENV['rvm_src_path'], ENV['rvm_ruby_string'])
+
+  # Add the sources, use a LibraryRepository to bundle .h and .c files
+  add path, :reject=>/\.(o|a|dylib)$/, :class=>Qwandry::LibraryRepository
+end
+
 # Qwandry is a ruby app after all, so activate ruby and gem by default.  Other defaults can be set
 # with a custom init.rb
 default :ruby, :gem