Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/colorize.rb

Overview

Colorize String class extension.

Borrowed directly from the colorize gem. It hasn’t changed in 4 years and I didn’t want to add a gem dependency.

Constant Summary collapse

COLORS =

Colors Hash

{
  :black          => 0,
  :red            => 1,
  :green          => 2,
  :yellow         => 3,
  :blue           => 4,
  :magenta        => 5,
  :cyan           => 6,
  :white          => 7,
  :default        => 9,

  :light_black    => 10,
  :light_red      => 11,
  :light_green    => 12,
  :light_yellow   => 13,
  :light_blue     => 14,
  :light_magenta  => 15,
  :light_cyan     => 16,
  :light_white    => 17
}
MODES =

Modes Hash

{
  :default        => 0, # Turn off all attributes
  #:bright        => 1, # Set bright mode
  :underline      => 4, # Set underline mode
  :blink          => 5, # Set blink mode
  :swap           => 7, # Exchange foreground and background colors
  :hide           => 8  # Hide text (foreground color would be the same as background)
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.color_matrix(txt = "[X]") ⇒ Object

Display color matrix with color names.



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# File 'lib/colorize.rb', line 180

def color_matrix( txt = "[X]" )
  size = String.colors.length
  String.colors.each do | color |
    String.colors.each do | back |
      print txt.colorize( :color => color, :background => back )
    end
    puts " < #{color}"
  end
  String.colors.reverse.each_with_index do | back, index |
    puts "#{"|".rjust(txt.length)*(size-index)} < #{back}"
  end
  ""
end

.colors ⇒ Object

Return array of available colors used by colorize method



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# File 'lib/colorize.rb', line 169

def colors
  keys = []
  COLORS.each_key do | key |
    keys << key
  end
  keys
end

.modes ⇒ Object

Return array of available modes used by colorize method



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# File 'lib/colorize.rb', line 158

def modes
  keys = []
  MODES.each_key do | key |
    keys << key
  end
  keys
end

Instance Method Details

#colorize(params) ⇒ Object

Change color of string

Examples:

puts "This is blue".colorize( :blue )
puts "This is light blue".colorize( :light_blue )
puts "This is also blue".colorize( :color => :blue )
puts "This is light blue with red background".colorize( :color => :light_blue, :background => :red )
puts "This is light blue with red background".colorize( :light_blue ).colorize( :background => :red )
puts "This is blue text on red".blue.on_red
puts "This is red on blue".colorize( :red ).on_blue
puts "This is red on blue and underline".colorize( :red ).on_blue.underline
puts "This is blue text on red".blue.on_red.blink
puts "This is uncolorized".blue.on_red.uncolorize



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# File 'lib/colorize.rb', line 80

def colorize( params )
  return self unless STDOUT.isatty

  begin
    require 'Win32/Console/ANSI' if RUBY_PLATFORM =~ /win32/
  rescue LoadError
    raise 'You must gem install win32console to use colorize on Windows'
  end

  color_parameters = {}

  if (params.instance_of?(Hash))
    color_parameters[:color] = COLORS[params[:color]]
    color_parameters[:background] = COLORS[params[:background]]
    color_parameters[:mode] = MODES[params[:mode]]
  elsif (params.instance_of?(Symbol))
    color_parameters[:color] = COLORS[params]
  end

  color_parameters[:color] ||= @color ||= COLORS[:default]
  color_parameters[:background] ||= @background ||= COLORS[:default]
  color_parameters[:mode] ||= @mode ||= MODES[:default]

  color_parameters[:uncolorized] ||= @uncolorized ||= self.dup

  # calculate bright mode
  color_parameters[:color] += 50 if color_parameters[:color] > 10

  color_parameters[:background] += 50 if color_parameters[:background] > 10

  "\033[#{color_parameters[:mode]};#{color_parameters[:color]+30};#{color_parameters[:background]+40}m#{color_parameters[:uncolorized]}\033[0m".set_color_parameters( color_parameters )
end

#colorized? ⇒ Boolean

Return true if sting is colorized

Returns:

  • (Boolean) 


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# File 'lib/colorize.rb', line 123

def colorized?
  !defined?(@uncolorized).nil?
end

#uncolorize ⇒ Object

Return uncolorized string



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# File 'lib/colorize.rb', line 116

def uncolorize
  @uncolorized || self
end