[Yaml-core] YamlTester.rb

[Oren Ben-K. <or...@be...>]

Attached is a tiny Ruby program my son has written that is a sort of 
graphical "ysh":
- Type YAML in one pane and view the Ruby data structure in the other 
(or vice-versa);
- Load/save the YAML (or Ruby) source, in case you want to submit a bug 
report or something;
- Set the text font;
- Converts tabs to a user-defined number of spaces on input;
- Uses PP to format the Ruby data;
- Uses YAML to remember the configuration (in $HOME/.yamltester).
You'll need to have the gtk2 ruby libraries installed, and we only tried 
it on Linux - Windows might or might not work.

It is useful if you want to try out all sort of YAML <=> Ruby 
conversions. For example, it discovered the following bug:

    class Klass
    end
    parserLoopsForever = YAML::load("--- !ruby/object:Klass")

Have fun,

	Oren Ben-Kiki