quick and friendly bash terminal colors

Just published vtfmt, a small bash utility to quickly colorize strings without either dragging in a huge library with too much features or having to manually put (and remember) ANSI escape codes. I have tried to keep it as minimal as possible and I am still surprised how far can just three lines go!

The implementation is pretty straightforward. An associative array with friendly names for the different ANSI color codes and a function that appends these as a mode between \033[ and m :)

#!/usr/bin/env bash

declare -A FMT_SET=(
  # Set
  [reset]=0
  [bold]=1
  [dim]=2
  [underline]=4
  [blink]=5
  [reverse]=7
  [hidden]=8
  # fg colors
  [fg:default]=39
  [fg:black]=30
  [fg:red]=31
  [fg:green]=32
  [fg:yellow]=33
  [fg:blue]=34
  [fg:magenta]=35
  [fg:cyan]=36
  [fg:light-gray]=37
  [fg:dark-gray]=90
  [fg:light-red]=91
  [fg:light-green]=92
  [fg:light-yellow]=93
  [fg:light-blue]=94
  [fg:light-magenta]=95
  [fg:light-cyan]=96
  [fg:white]=97
  # bg colors
  [bg:default]=49
  [bg:black]=40
  [bg:red]=41
  [bg:green]=42
  [bg:yellow]=43
  [bg:blue]=44
  [bg:magenta]=45
  [bg:cyan]=46
  [bg:light-gray]=47
  [bg:dark-gray]=100
  [bg:light-red]=101
  [bg:light-green]=102
  [bg:light-yellow]=103
  [bg:light-blue]=104
  [bg:light-magenta]=105
  [bg:light-cyan]=106
  [bg:white]=107
)

function vtfmt {
  local out=(); for comp in "$@"; do out+=("${FMT_SET[$comp]}"); done
  IFS=';' ; echo "\033[${out[*]}m"
}

# script is not sourced
if [[ ${#BASH_SOURCE[@]} -lt 2 ]]; then
  # has arguments
  if [[ $# -gt 0 ]]; then
    vtfmt "$@"
  else
    echo -en "$(vtfmt bg:light-magenta fg:black bold) vtfmt $(vtfmt reset) "
    echo -e "This utility is by no means $(vtfmt fg:green)feature $(vtfmt underline)complete.$(vtfmt reset) "
    echo -e "And yet it can do quite some things considering how $(vtfmt bold)small$(vtfmt normal) it is!"
    echo ""
    declare -f vtfmt
    echo ""

    # or basically anywhere to compose different color modes
    WARN_C="$(vtfmt bg:yellow fg:black) WARN $(vtfmt reverse) %s$(vtfmt reset)\n"
    INF_C="$(vtfmt bg:green fg:black) INFO $(vtfmt reverse) %s$(vtfmt reset)\n"
    ERR_C="$(vtfmt bg:red fg:black)  ERR $(vtfmt reverse) %s$(vtfmt reset)\n"

    function inf  { printf "$INF_C" "$*" ; }
    function err  { printf "$ERR_C" "$*" ; }
    function warn { printf "$WARN_C" "$*" ; }

    inf "some info"
    warn "you have been warned"
    err "such an error"
  fi
fi