logicvimrc/colors/256colors2.rb

#!/usr/bin/env ruby
#
# Translator (ruby): Noah K. Tilton <noah@downbe.at>
# Author (perl>: Todd Larason <jtl@molehill.org>

# use the resources for colors 0-15 - usually more-or-less a
# reproduction of the standard ANSI colors, but possibly more
# pleasing shades
#
# colors 16-231 are a 6x6x6 color cube
0.upto 6 do |red|
  0.upto 6 do |green|
    0.upto 6 do |blue|
        printf "\x1b]4;%d;rgb:%2.2x/%2.2x/%2.2x\x1b\\",
                16 + (red * 36) + (green * 6) + blue,
                red ? (red * 40 + 55) : 0,
                green ? (green * 40 + 55) : 0,
                blue ? (blue * 40 + 55) : 0

    end
  end
end

# colors 232-255 are a grayscale ramp, intentionally leaving out
# black and white
0.upto 23 do |gray|
  level = (gray * 10) + 8
  printf("\x1b]4;%d;rgb:%2.2x/%2.2x/%2.2x\x1b\\",
                232 + gray, level, level, level);
end
 
# display the colors
# first the system ones:
print "System colors:\n";
0.upto 7 do |color|
  print "\x1b[48;5;#{color}m  ";
end
print "\x1b[0m\n"

8.upto 15 do |color|
  print "\x1b[48;5;#{color}m  ";
end
print "\x1b[0m\n\n";

# now the color cube
print "Color cube, 6x6x6:\n";
0.upto 5 do |green|
  0.upto 5 do |red|
    0.upto 5 do |blue|
        color = 16 + (red * 36) + (green * 6) + blue
 	print "\x1b[48;5;#{color}m  ";
    end
    print "\x1b[0m ";
  end
  print "\n";
end

# now the grayscale ramp
print "Grayscale ramp:\n";
232.upto 255 do |color|
  print "\x1b[48;5;#{color}m  ";
end
print "\x1b[0m\n";