emulate -L zsh -o extendedglob
# Function:  cvt_256_colors_2_rgb_hex_fmt
local     E N c
local -a  T S XC NRGB
local -aU RGB
for N ({0..255}) {
  :
  read -s -t1 -d $'\a' $'c?\e]4;'${N}$';?\a' && XC+=("$N ${c##*;}")
}
for E ($XC) {
  S=(${(z)E}) ; T=(${(s./.)S[2]#*:})
  NRGB+=("${(l.3..0.)S[1]} ${${T[1]}[1,2]}${${T[2]}[1,2]}${${T[3]}[1,2]}")
  RGB+=("${${T[1]}[1,2]}${${T[2]}[1,2]}${${T[3]}[1,2]}")
}
#print -- "XC: $#XC   NRGB: $#NRGB   RGB: $#RGB"
#print -- "$XC[1]   $XC[256]"
#print -- "$NRGB[1]   $NRGB[256]"
#print -- "$RGB[1]   $RGB[256]"
#print -l -- $XC
#print -l -- $NRGB
#print -l -- $RGB
# Next line is just output to see if read command is doing something strange
for E (${(ok)parameters}) print -- $E
# vim: ts=2 sw=2 sts=2 sta ai et ft=zsh :