Test true color support for terminal emulator.

print-true-color.zsh

#!/usr/bin/env zsh

##
# Test true color support for terminal emulator.
#
# To test it, `source` this file and use `print_true_color f1c40f 'something'`.
#
# @author Kutsan Kaplan <me@kutsankaplan.com>
# @license WTFPL
# @version 1.0.0
##

##
# @param {string} $1 HEX color code without '#' symbol.
# @param {string} $2 Test text.
##
function print_true_color() {
  local RGB=$(printf "%d %d %d" 0x${1:0:2} 0x${1:2:2} 0x${1:4:2})

  typeset -g tone
  foreach tone ('R' 'G' 'B') {
    local i=${i:-1}
    local $tone=$(printf $RGB | cut --fields=$i --delimiter=' ')
    let i++
  }
  unset tone

  local fg_lc="%{\e[38;2;"
  local bg_lc="%{\e[48;2;"
  local rc="m%}$2%{\e[0m%}"

  print -P "${fg_lc}${R};${G};${B}${rc}"
}