dotfiles/.config/zsh/functions/ansi-colours

#!/usr/bin/env zsh
# Prints ANSI colours along with their escape codes. Let the first argument be
# 8 to limit output to classic colours.
# https://tintin.mudhalla.net/info/256color/
# https://gist.github.com/Prakasaka/219fe5695beeb4d6311583e79933a009

function _ansi-colors_8()
{
    local title="${1}"
    local start="${2}"

    print "\e[1;97m${title}\e[0m:"
    print "Regular   Bold      Underline Backgr.   Dim       Reversed  Blinking"
    for n in {${start}..$(( ${start}+7 ))}; do
        local nbg=$(( ${n}+10 ))
        print -c "\e[0;${n}m\\\e[0;${n}m\e[m" "\e[1;${n}m\\\e[1;${n}m\e[m" \
              "\e[4;${n}m\\\e[4;${n}m\e[m" "\e[${nbg}m\\\e[${nbg}m\e[m" \
              "\e[2;${n}m\\\e[2;${n}m\e[m" "\e[7;${n}m\\\e[7;${n}m\e[m" \
              "\e[5;${n}m\\\e[5;${n}m\e[m"
    done
}

function _ansi-colors_256()
{
    print "\n\e[1;97m256 colour pallette:\e[0m"
    local -a colours
    for n in {0..15}; do
        colours+="\e[38;5;${n}m\\\e[38;5;${n}m\e[0m"
    done
    print -C 2 ${colours}
    colours=()
    for n in {16..255}; do
        colours+="\e[38;5;${n}m\\\e[38;5;${n}m\e[0m"
    done
    print -C 6 -a ${colours}

    print "\n\e[1;97m256 colour background:\e[0m 48 instead of 38"
    print "\e[1;97mTrue colour:\e[0m \\\e[38;2;\e[0;31mR\e[0m;\e[0;32mG\e[0m;\e[0;34mB\e[0mm" \
          "and \\\e[48;2;\e[0;41mR\e[0m;\e[0;42mG\e[0m;\e[0;44mB\e[0mm"
}

_ansi-colors_8 "Classic colours" 30
print
_ansi-colors_8 "High intensity colours" 90

[[ -v 1 && "${1[1]}" == "8" ]] || _ansi-colors_256

print "\n\e[1;97mReset:\e[0m \\\e[0m"
unfunction _ansi-colors_8 _ansi-colors_256