#!/usr/bin/ruby
# https://en.wikipedia.org/wiki/Ruby_(programming_language)#Metaprogramming
var colors = Hash(
               'black'   => "000",
               'red'     => "f00",
               'green'   => "0f0",
               'yellow'  => "ff0",
               'blue'    => "00f",
               'magenta' => "f0f",
               'cyan'    => "0ff",
               'white'   => "fff",
             );
for color,code in colors {
    String.def_method("in_#{color}", func (self) {
        %Q<<span style="color: ##{code}">#{self}</span>>
    })
}
say "blue".in_blue;
say "red".in_red;
say "white".in_white;
assert_eq("blue".in_blue, %q(<span style="color: #00f">blue</span>))
assert_eq("red".in_red, %q(<span style="color: #f00">red</span>))
assert_eq("white".in_white, %q(<span style="color: #fff">white</span>))