Add some useful mgems

.gitmodules

@@ -2,3 +2,12 @@
 	path = libs/mruby
 	url = https://github.com/mruby/mruby.git
   ignore = dirty
+[submodule "libs/mgems/mruby-process"]
+	path = libs/mgems/mruby-process
+	url = https://github.com/katzer/mruby-process
+[submodule "libs/mgems/mruby-env"]
+	path = libs/mgems/mruby-env
+	url = https://github.com/iij/mruby-env.git
+[submodule "libs/mgems/mruby-marshal-c"]
+	path = libs/mgems/mruby-marshal-c
+	url = https://github.com/LanzaSchneider/mruby-marshal-c.git

libs/changes.patch

@@ -20,6 +20,17 @@
  
    # Use mrbgems
    # conf.gem 'examples/mrbgems/ruby_extension_example'
+@@ -16,6 +28,10 @@
+   # include the GEM box
+   conf.gembox 'default'
+ 
++  conf.gem '../mgems/mruby-env'
++  conf.gem '../mgems/mruby-process'
++  conf.gem '../mgems/mruby-marshal-c'
++
+   # C compiler settings
+   # conf.cc do |cc|
+   #   cc.command = ENV['CC'] || 'gcc'
 @@ -79,5 +79,5 @@
    # Turn on `enable_debug` for better debugging
    # conf.enable_debug
@@ -28,3 +39,15 @@
 +  # conf.enable_bintest
 +  # conf.enable_test
  end
+--- ./mgems/mruby-process/mrbgem.rake
++++ ./mgems/mruby-process/mrbgem.rake
+@@ -54,4 +54,9 @@
+   else
+     spec.objs.delete objfile("#{build_dir}/src/win32")
+   end
++
++  spec.objs.delete objfile("#{build_dir}/src/internal")
++  spec.objs.delete objfile("#{build_dir}/src/dln")
++  spec.objs.delete objfile("#{build_dir}/src/signal")
++  spec.objs.delete objfile("#{build_dir}/src/status")
+ end

samples/button.rb

@@ -19,7 +19,7 @@ bg_image1_a = Animation.from(bg_image1)
 App.language = :en
 App.localize(:en, :btn_text, "Click %{name}!")
 
-text = ElementText.new :btn_text, default_font, 0xFFFF00, {name: "Me"}, position: {x: 50, y: 50}, z: 1, click_mode: :block, alpha: 1
+text = ElementText.new :btn_text, default_font, 0xFFFF00, {name: ENV.fetch("name", "me")}, position: {x: 50, y: 50}, z: 1, click_mode: :block, alpha: 1
 
 rect = ElementRect.new 100, 25, 0xFF0000, position: {x: 50, y: 50}, z: 0, rotation: 60, scale: { x: 1, y: 1 }, alpha: 0.8, click_mode: :block