Set iTerm2 tab color

co

#!/usr/bin/env ruby
# Codes at https://iterm2.com/documentation-escape-codes.html
# License: MIT License, text at https://mit-license.org/

color_table = {
  'blue' => '#2d74ef',
  'blue-2' => '#5bb0d8',
  'red' => '#f22e2e',
  'red-2' => '#d17777',
  'yellow' => '#f2e235',
  'yellow-2' => '#efcb2b',
  'pink' => '#e52bef',
  'green' => '#66ef2b',
  'green-2' => '#aad398',
  'white' => '#ffffff',
  'gray' => '#c4c4c4',
  'gray-2' => '#5b5b5b',
  'black' => '#000000',
}
def setcolor(colors)
  print(['red', 'green', 'blue'].zip(colors).map do |n, v|
    "\x1b]6;1;bg;#{n};brightness;#{v}\x07"
  end.join)
end
def to_rgb(s)
  [ s[1..2], s[3..4], s[5..6] ].map{|x| x.to_i(16)}
end

color_name = ARGV[0]&.downcase
unless color_table.key?(color_name)
  puts "Usage: co <color name>\nAvailable colors:"
  color_table.each { |n,_| puts("  #{n}") }
  return
end
setcolor(to_rgb color_table[color_name])