Implement Module#name.

Solves #2132.

mrbgems/default.gembox

@@ -71,6 +71,9 @@ MRuby::GemBox.new do |conf|
   # Use Kernel module extension
   conf.gem :core => "mruby-kernel-ext"
 
+  # Use extensional Module class
+  conf.gem :core => "mruby-module-ext"
+
   # Use mruby-compiler to build other mrbgems
   conf.gem :core => "mruby-compiler"
 end

mrbgems/mruby-module-ext/mrbgem.rake

+MRuby::Gem::Specification.new('mruby-module-ext') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+  spec.summary = 'extensional Module class'
+end

mrbgems/mruby-module-ext/src/module.c

+#include "mruby.h"
+#include "mruby/class.h"
+#include "mruby/string.h"
+
+static mrb_value
+mrb_mod_name(mrb_state *mrb, mrb_value self)
+{
+  mrb_value name = mrb_class_path(mrb, mrb_class_ptr(self));
+  return mrb_nil_p(name)? name : mrb_str_dup(mrb, name);
+}
+
+void
+mrb_mruby_module_ext_gem_init(mrb_state *mrb)
+{
+  struct RClass *mod = mrb->module_class;
+
+  mrb_define_method(mrb, mod, "name", mrb_mod_name, MRB_ARGS_NONE());
+}
+
+void
+mrb_mruby_module_ext_gem_final(mrb_state *mrb)
+{
+}

mrbgems/mruby-module-ext/test/module.rb

+assert 'Module#name' do
+  module A
+    class B
+    end
+  end
+
+  assert_nil A::B.singleton_class.name
+  assert_equal 'Fixnum', Fixnum.name
+  assert_equal 'A::B', A::B.name
+end