This quick class extends the base String class to add the ability to chain escape codes onto your output. For instance: puts 'String'.bold.underline.blink.red for something truly hideous. Aside from the colors (all are supported, but I haven't put in support for background colors as of the time of this post), cursor placement (ymmv based on the term type), screen clearing, bold, underline, blink reverse, conceal are all handled as well.
Ruby, 35 lines
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# Normal colors
def black; colorize(self, "\e[0m\e[30"); end
def red; colorize(self, "\e[0m\e[31"); end
def green; colorize(self, "\e[0m\e[32"); end
def yellow; colorize(self, "\e[0m\e[33"); end
def blue; colorize(self, "\e[0m\e[34"); end
def purple; colorize(self, "\e[0m\e[35"); end
def cyan; colorize(self, "\e[0m\e[36"); end
def white; colorize(self, "\e[0m\e[37"); end
# Fun stuff
def clean; colorize(self, "\e[0"); end
def bold; colorize(self, "\e[1"); end
def underline; colorize(self, "\e[4"); end
def blink; colorize(self, "\e[5"); end
def reverse; colorize(self, "\e[7"); end
def conceal; colorize(self, "\e[8"); end
# Blanking
def clear_scr; colorize(self, "\e[2", mode="J"); end
# Placement
def place(line, column)
colorize(self, "\e[#{line};#{column}", mode='f')
end
def save_pos; colorize(self, "\e[", mode='s'); end
def return_pos; colorize(self, "\e[", mode='u'); end
def colorize(text, color_code, mode='m')
"#{color_code}#{mode}#{text}\e[0m"
end
end
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Reasons for wanting to colorize your output can be wildly varied, but it all really boils down to one thing. Keeping your eyes from bleeding as you frantically scan pages of grey text on a black background as they whiz by looking for anything out of the ordinary.
This is also now available as a gem 'easy-color'.