string_colorize.rb

# config/initializers/string.rb

class String
  ##---------------bg Color-----------------##

  def black;          "\e[30m#{self}\e[0m" end
  def red;            "\e[31m#{self}\e[0m" end
  def green;          "\e[32m#{self}\e[0m" end
  def brown;          "\e[33m#{self}\e[0m" end
  def blue;           "\e[34m#{self}\e[0m" end
  def magenta;        "\e[35m#{self}\e[0m" end
  def cyan;           "\e[36m#{self}\e[0m" end
  def gray;           "\e[37m#{self}\e[0m" end

  ##---------------bg Color-----------------##

  def bg_black;       "\e[40m#{self}\e[0m" end
  def bg_red;         "\e[41m#{self}\e[0m" end
  def bg_green;       "\e[42m#{self}\e[0m" end
  def bg_brown;       "\e[43m#{self}\e[0m" end
  def bg_blue;        "\e[44m#{self}\e[0m" end
  def bg_magenta;     "\e[45m#{self}\e[0m" end
  def bg_cyan;        "\e[46m#{self}\e[0m" end
  def bg_gray;        "\e[47m#{self}\e[0m" end

  ##---------------Fonts--------------------##
  def bold;           "\e[1m#{self}\e[22m" end
  def italic;         "\e[3m#{self}\e[23m" end
  def underline;      "\e[4m#{self}\e[24m" end
  def blink;          "\e[5m#{self}\e[25m" end
  def reverse_color;  "\e[7m#{self}\e[27m" end
end

# Usage

puts "I'm back green".bg_green
puts "I'm red and back cyan".red.bg_cyan
puts "I'm bold and green and backround red".bold.green.bg_red



# -------------------------------------- Other way to do same ----------------------------------------------- #

class Colorizator
  FONTS = { bold: '1', dim: '2', italic: '3', underline: '4', reverse: '7', hidden: '8' }.freeze

  COLORS = {
    red:          '31',
    blue:         '34',
    cyan:         '36',
    gray:         '37',
    brown:        '33',
    green:        '32',
    white:        '1;37',
    black:        '30',
    purple:       '35',
    yellow:       '1;33',
    default:      '38',
    dark_gray:    '1;30',
    light_red:    '1;31',
    light_blue:   '1;34',
    light_cyan:   '1;36',
    light_green:  '1;32',
    light_purple: '1;35'
  }.freeze

  BG_COLORS = {
    red:          '41',
    cyan:         '46',
    gray:         '47',
    blue:         '44',
    black:        '40',
    green:        '42',
    brown:        '43',
    white:        '107',
    purple:       '45',
    yellow:       '103',
    default:      '0',
    light_red:    '101',
    dark_gray:    '100',
    light_blue:   '104',
    light_cyan:   '106',
    light_green:  '102',
    light_purple: '105'
  }.freeze

  attr_reader :text,
              :color,
              :bg_color,
              :font_options

  def initialize(text, color, bg_color = :default, **options)
    @text = text
    @color = color
    @bg_color = bg_color
    @font_options = options.select { |k, v| v && FONTS.key?(k) }.keys
  end

  def self.colorize(text, color, bg_color, **options)
    new(text, color, bg_color, **options).colorize
  end

  def colorize
    "\e[#{bg_color_code};#{font};#{color_code}m#{text}\e[0m".squeeze(';')
  end

  private

  def font
    font_options.map { |e| FONTS[e] }.join(';').squeeze
  end

  def color_code
    COLORS[color] || :default
  end

  def bg_color_code
    BG_COLORS[bg_color] || :default
  end
end