Cor

Cor (which means color in Portuguese) is a library for more easily working with colors in Crystal. You can think of it as a more powerful version of Colorize. Cor allows you to very easily convert RGB(A) values to hex and back again for use in CSS and HTML. It also provides a set of chainable methods for creting colorful strings for the terminal using truecolor.

Installation

1. Add the dependency to your shard.yml:

   dependencies:
     cor:
       github: watzon/cor
   

2. Run shards install

Usage

Creating a color

require "cor"

red = Cor.new(255, 0, 0)
# or you can do
red = Cor.new("FF0000")
# or you can also do
red = Cor.color(:red)

You can also include an alpha value

mid_red = Cor.new(255, 0, 0, 0.5)

Getting a hex string

blue = Cor.color(:blue)
puts blue.hex_string
# => 0000ff

#hex_string also provides a couple of formatting options

puts blue.hex_string(prefix: true)
# => #0000ff

puts blue.hex_string(alpha: true)
# => 0000ffff

puts blue.hex_string(upcase: true)
# => 0000FF

Retting a RGB string

magenta = Cor.color(:magenta)

puts magenta.rgb_string
# => rgb(255, 0, 255)

puts magenta.rgb_string(alpha: true)
# => rgb(255, 0, 255, 1)

Math with colors

The Cor class includes the basic math methods as well which means if, for whatever reason, you want to add, subtract, multiply, or divide colors, you can.

puts Cor.color(:magenta) - Cor.color(:blue)
# => #<Cor:0x7f5892e2df60 @alpha=255, @blue=255, @green=0, @red=0>

24 bit truecolor strings

Most modern terminals have support for True color which allows you to add color to your terminal output. Crystal already has support for color output via the Colorize module in the standard library, but Cor takes things a step further by allowing you to not only colorize your output, but also bold, italicize, underline, overline, blink, etc.

Cor also provides a String patch that gives the String class chainable truecolor methods.

require "cor"
require "cor/string"

puts "This is awesome!".fore(:blue).back(:white)

puts "Bold me!".bold
puts "Italic me!".italic
puts "Strike me!".strike
puts "Blink me like it's 1999!".blink
puts "Faint me!".faint
puts "Underline me!".underline
puts "Overline me!".overline

Development

TODO: Write development instructions here

Contributing

1. Fork it (https://github.com/watzon/cor/fork)
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 a new Pull Request

Contributors

• Chris Watson - creator and maintainer