oh-my-zsh/lib/spectrum.zsh

#! /bin/zsh
# A script to make using 256 colors in zsh less painful.
# P.C. Shyamshankar <sykora@lucentbeing.com>
# Copied from http://github.com/sykora/etc/blob/master/zsh/functions/spectrum/
 
typeset -Ag FX FG BG
 
FX=(
reset ""
bold "" no-bold ""
italic "" no-italic ""
underline "" no-underline ""
blink "" no-blink ""
reverse "" no-reverse ""
)
 
for color in {000..255}; do
FG[$color]="[38;5;${color}m"
BG[$color]="[48;5;${color}m"
done