How can I use Ruby to colorize the text output to a terminal? [closed]

Colorize is my favorite gem! :-)

Check it out:

https://github.com/fazibear/colorize

Installation:

gem install colorize

Usage:

require 'colorize'puts "I am now red".redputs "I am now blue".blueputs "Testing".yellow

Combining the answers above, you can implement something that works like the gem colorize without needing another dependency.

class String  # colorization  def colorize(color_code)    "\e[#{color_code}m#{self}\e[0m"  end  def red    colorize(31)  end  def green    colorize(32)  end  def yellow    colorize(33)  end  def blue    colorize(34)  end  def pink    colorize(35)  end  def light_blue    colorize(36)  endend

As String class methods (Unix only):

class Stringdef black;          "\e[30m#{self}\e[0m" enddef red;            "\e[31m#{self}\e[0m" enddef green;          "\e[32m#{self}\e[0m" enddef brown;          "\e[33m#{self}\e[0m" enddef blue;           "\e[34m#{self}\e[0m" enddef magenta;        "\e[35m#{self}\e[0m" enddef cyan;           "\e[36m#{self}\e[0m" enddef gray;           "\e[37m#{self}\e[0m" enddef bg_black;       "\e[40m#{self}\e[0m" enddef bg_red;         "\e[41m#{self}\e[0m" enddef bg_green;       "\e[42m#{self}\e[0m" enddef bg_brown;       "\e[43m#{self}\e[0m" enddef bg_blue;        "\e[44m#{self}\e[0m" enddef bg_magenta;     "\e[45m#{self}\e[0m" enddef bg_cyan;        "\e[46m#{self}\e[0m" enddef bg_gray;        "\e[47m#{self}\e[0m" enddef bold;           "\e[1m#{self}\e[22m" enddef italic;         "\e[3m#{self}\e[23m" enddef underline;      "\e[4m#{self}\e[24m" enddef blink;          "\e[5m#{self}\e[25m" enddef reverse_color;  "\e[7m#{self}\e[27m" endend

And usage:

puts "I'm back green".bg_greenputs "I'm red and back cyan".red.bg_cyanputs "I'm bold and green and backround red".bold.green.bg_red

In my console:

Additionally,

def no_colors  self.gsub /\e\[\d+m/, ""end

removes formatting characters.

Note

puts "\e[31m" # set format (red foreground)puts "\e[0m"   # clear formatputs "green-#{"red".red}-green".green # will be green-red-normal, because of \e[0