A Rubygem for colorizing text with 256-color ANSI codes
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Gemfile
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Rakefile
ansi256.gemspec
colorize-me-16.png
colorize-me.png
say-hello-world.png
xterm-color-chart.png

README.md

ansi256

ansi256 is a rubygem for colorizing text with 256-color ANSI codes.

Features:

  • Supports both named color codes and numeric 256-color codes
  • Allows nesting of colored text
  • Generates optimal(shortest) code sequence

Installation

$ gem install ansi256

Basic usage

Numeric 256-color codes

require 'ansi256'

# Foreground color
puts "Colorize me".fg(111)

# With background color
puts "Colorize me".fg(111).bg(226)

# Also with underline
puts "Colorize me".fg(111).bg(226).underline

# Strip ANSI codes
puts "Colorize me".fg(111).bg(226).underline.plain

colorize-me

16 named colors

s = "Colorize me"
puts [ s.black,   s.black.bold,   s.white.bold.on_black   ].join ' '
puts [ s.red,     s.red.bold,     s.white.bold.on_red     ].join ' '
puts [ s.green,   s.green.bold,   s.white.bold.on_green   ].join ' '
puts [ s.yellow,  s.yellow.bold,  s.white.bold.on_yellow  ].join ' '
puts [ s.blue,    s.blue.bold,    s.white.bold.on_blue    ].join ' '
puts [ s.magenta, s.magenta.bold, s.white.bold.on_magenta ].join ' '
puts [ s.cyan,    s.cyan.bold,    s.white.bold.on_cyan    ].join ' '
puts [ s.white,   s.white.bold,   s.white.bold.on_white   ].join ' '

colorize-me-16

RGB color approximated to 256-color ANSI code

puts "RGB Color (RRGGBB)".fg('ff9930').bg('203366')

puts "RGB Color (R-G-B-)".fg('f90').bg('036')

puts "RGB Color (Monochrome)".fg('ef').bg('3f')

Nesting

Unlike the other similar gems, Ansi256 allows you to nest colored text.

require 'ansi256'

puts           world = "World".bg(226).fg(232).underline
puts     hello_world = "Hello #{world} !".fg(230).bg(75)
puts say_hello_world = "Say '#{hello_world}'".fg(30)
puts say_hello_world.plain.fg(27)

say-hello-world

Ansi256 methods

Ansi256.fg(232)
Ansi256.bg(226)
Ansi256.green
Ansi256.on_green
Ansi256.bold
Ansi256.underline
Ansi256.reset

Ansi256.fg(232, 'Hello')
Ansi256.bg(226, 'World')
Ansi256.green('Hello World')

Disabling extended String methods

Ansi256.enabled?
  # true

# Print colored output only when STDOUT is tty
Ansi256.enabled = $stdout.tty?

"Hello".fg(232)
  # Hello

ansi256 executable

Ansi256 comes with ansi256 script which can be used as follows

usage: ansi256 [-u] <[fg][/bg]> [mesage]

# Numeric color codes
ansi256 232 "Hello world"
ansi256 /226 "Hello world"
ansi256 232/226 "Hello world"

# Named color codes
ansi256 yellow "Hello world"
ansi256 /blue "Hello world"
ansi256 yellow/blue "Hello world"

# RGB colors (only support 6-letter hex codes)
ansi256 ff9900/000033 "Hello world"

# Mixed color codes
ansi256 yellow/232 "Hello world"

# Bold yellow
ansi256 yellow/232 -b "Hello world"

# With underline
ansi256 yellow/232 -b -u "Hello world"

# Colorizing STDIN
find / | ansi256 -u /226

# Nesting
ansi256 30 "Say '$(ansi256 230/75 "Hello $(ansi256 -u 232/226 World)")'"

Color chart

256-color table

require 'ansi256'

def cfmt col
  col.to_s.rjust(5).fg(232).bg(col)
end

puts (0..7).map  { |col| cfmt col }.join
puts (8..15).map { |col| cfmt col }.join
(16..255).each_slice(6) do |slice|
  puts slice.map { |col| cfmt col }.join
end

Reference chart

xterm-color-chart.png

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request