Terminal color in Ruby

Question

Is there a Ruby module for colorizing strings in a Linux terminal?

Answer 1

I prefer the Rainbow gem since it also supports Windows if the win32console gem has been installed.

You can use it like this:

puts "some " + "red".color(:red) + " and " + "blue on yellow".color(:blue).background(:yellow)

Answer 2

Ehm, OK, Google was my friend :)

http://term-ansicolor.rubyforge.org/

Answer 3

All you have to do is start with "\e[##m" and end with "\e[0m"

Just replace the ## with the color number. Examples are:

• 31:Red
• 32:Green
• 33:Yellow
• 34:Blue
• 35:Magenta
• 36:Teal
• 37:Grey

1:Bold (can be used with any color)

Here is a Ruby script to show all the terminal colors. Download it or run the code below.

def color(index)
  normal = "\e[#{index}m#{index}\e[0m"
  bold = "\e[#{index}m\e[1m#{index}\e[0m"
  "#{normal}  #{bold}  "
end

8.times do|index|
  line = color(index + 1)
  line += color(index + 30)
  line += color(index + 90)
  line += color(index + 40)
  line += color(index + 100)
  puts line
end

Answer 4

Using String class methods like:

class String
def black;          "\033[30m#{self}\033[0m" end
def red;            "\033[31m#{self}\033[0m" end
def green;          "\033[32m#{self}\033[0m" end
def brown;          "\033[33m#{self}\033[0m" end
def blue;           "\033[34m#{self}\033[0m" end
def magenta;        "\033[35m#{self}\033[0m" end
def cyan;           "\033[36m#{self}\033[0m" end
def gray;           "\033[37m#{self}\033[0m" end
end

and usage:

puts "This prints green".green
puts "This prints red".red