[DEPRECATED ]A simple zsh function to output term colors

colortest

## color-test
colortest () {
  
  colortest_usage () {
    echo -e "Usage: colortest [[-v|--verbose] | [-a|--all] | [-h|--help]]\n\nPrint out colors available in this terminal emulator. The default output is a short list of colors. If -v or --verbose is specified, a table containing all combination of background and foreground colors is displayed. Alternatively, if -a or -all is specified, then both short list and the detailed table would be displayed.\n\nNote that there should be no argument to this programme.\n  -v, --verbose\t displays a table with detailed table of combinations of colors.\n  -a, --all    \t displays both brief and detailed results.\n  -h, --help   \t displays this help."
  }
  
  if [[ "$#" > 1 ]]; then
    echo -e "$0: Error(1): At most one flag is allowed." >&2 | logger
    colortest_usage
    unset colortest_usage
    return 1
  fi
  
  colortest_short () {
    ### gives the color table (text)
    echo -e "\033[0mNC (No color)"
    echo -e "\033[0;30mBLACK     \t\033[1;30mGRAY"
    echo -e "\033[0;31mRED       \t\033[1;31mLIGHT_RED"
    echo -e "\033[0;32mGREEN     \t\033[1;32mLIGHT_GREEN"
    echo -e "\033[0;33mYELLOW    \t\033[1;33mLIGHT_YELLOW"
    echo -e "\033[0;34mBLUE      \t\033[1;34mLIGHT_BLUE"
    echo -e "\033[0;35mPURPLE    \t\033[1;35mLIGHT_PURPLE"
    echo -e "\033[0;36mCYAN      \t\033[1;36mLIGHT_CYAN"
    echo -e "\033[0;37mLIGHT_GRAY\t\033[1;37mWHITE\033[0m"
  }
  
  if [[ "$#" -eq 0 ]]; then
    colortest_short
    unset -f colortest_usage colortest_short
    return 1
  fi
  
  option=$(getopt -q -o vha --long verbose,help,all -- "$@")
  if [[ ! "$?" -eq 0 ]]; then
    echo -e "$0: Error(1): Unrecognized option $1." >&2 | logger
    colortest_usage
    unset -f colortest_usage colortest_short
    unset option
    return 1
  fi
  
  colortest_long () {
    ### gives the color table
    printf "          "
    for b in 0 1 2 3 4 5 6 7; do
      printf "  4${b}m "
    done
    echo
    for f in "" 30 31 32 33 34 35 36 37; do
      for s in "" "1;"; do
        printf "%4sm" "${s}${f}"
        printf " \033[%sm%s\033[0m" "$s$f" "gYw "
        for b in 0 1 2 3 4 5 6 7; do
          printf " \033[4%s;%sm%s\033[0m" "$b" "$s$f" " gYw "
        done
        echo
      done
    done
  }
  
  while [[ "$#" > 0 ]]; do
    case "$1" in
      -h|--help) colortest_usage;;
      -v|--verbose) colortest_long;;
      -a|--all) colortest_short; colortest_long;;
      --) colortest_short;;
      *) echo "$0: Error(1): This function doesn't accept any argument." >&2 | logger; colortest_usage;unset -f colortest_usage colortest_short colortest_long; option; return 1;;
    esac
    shift
  done

  unset -f colortest_usage colortest_short colortest_long
  unset option
}

This implementation only works for zsh. It shall be put under $fpath and be autoloaded by zsh.

#-*- mode: shell-script -*-
# lscolor () {

emulate -RL zsh
setopt extendedglob

local myname usage opt lscolor_short
local -a lscolor_long
local b f s i

myname=${(%):-%N}

read -r -d '' usage <<EOT
Usage:
  $myname [options]

Print out colors available in this terminal emulator. The default output is a short list of colors, unless -v or -a flag is turned on.

Options:
-v,--verbose  display a table with all combination of background and foreground colors
-a,--all      display both the list of colors and the table of all combinations of foreground and backgroud colors.

-h,--help     display this help
EOT

option=$(getopt -q -o vha --long verbose,help,all -- "$@")

if [[ ! "$?" -eq 0 ]]; then
  echo -e "$0: Error(1): Unrecognized option $1." >&2 | logger
  print $usage
fi

read -r -d '' lscolor_short <<EOT
\033[0mNC (No color)
\033[0;30mBLACK     \t\033[1;30mGRAY
\033[0;31mRED       \t\033[1;31mLIGHT_RED
\033[0;32mGREEN     \t\033[1;32mLIGHT_GREEN
\033[0;33mYELLOW    \t\033[1;33mLIGHT_YELLOW
\033[0;34mBLUE      \t\033[1;34mLIGHT_BLUE
\033[0;35mPURPLE    \t\033[1;35mLIGHT_PURPLE
\033[0;36mCYAN      \t\033[1;36mLIGHT_CYAN
\033[0;37mLIGHT_GRAY\t\033[1;37mWHITE\033[0m
EOT

lscolor_long=("printf '          '")
for b in 0 1 2 3 4 5 6 7; do
  lscolor_long+="printf \"  4${b}m \""
done
for f in "" 30 31 32 33 34 35 36 37; do
  for s in "" "1;"; do
    lscolor_long+=("printf \"%4sm\" \"${s}${f}\"")
    lscolor_long+=("printf \" \033[%sm%s\033[0m\" \"$s$f\" \"gYw \"")
    for b in 0 1 2 3 4 5 6 7; do
      lscolor_long+=("printf \" \033[4%s;%sm%s\033[0m\" \"$b\" \"$s$f\" \" gYw \"")
    done
  done
done

if (( $# > 1 )); then
  print $usage
  return 1
fi

if (( $# == 0 )); then
  echo $lscolor_short
  return 0
fi

while getopts ":hva" opt; do
  case "${opt}" in
    h  ) echo $usage
         return 0
         ;;
    v  ) for i in $lscolor_long; do
           eval $i
         done
         return 0
         ;;
    a  ) print $lscolor_short
         for i in $lscolor_long; do
           eval $i
         done
         return 0
         ;;
  esac
done

#}