set up color mappings into associative arrays

colorset.bash

#!/usr/bin/env bash

${ZSH_VERSION+false} || emulate ksh
${BASH_VERSION+shopt -s lastpipe extglob}

# colorSet [ --setaf | --setab | --misc ] var
# Assigns the selected set of escape mappings to the given associative array names.
function colorSet {
	typeset -a clrs msc
	typeset x
	clrs=(black red green orange blue magenta cyan grey darkgrey ltred ltgreen yellow ltblue ltmagenta ltcyan white)
	msc=(sgr0 bold dim smul blink rev invis)

	while ! ${2:+false}; do
		${KSH_VERSION:+eval typeset -n "$2"=\$2}
		case ${1#--} in
			setaf|setab)
				for x in "${!clrs[@]}"; do
					eval "$2"'[${clrs[x]}]=$(tput "${1#--}" "$x")'
				done
				;;
			misc)
				for x in "${msc[@]}"; do
					eval "$2"'[$x]=$(tput "$x")'
				done
				;;
			*)
				return 1
		esac
		shift 2
	done
}

# Example code
function main {
	typeset -A fgColors bgColors miscEscapes
	if colorSet --setaf fgColors --setab bgColors --misc miscEscapes; then
		if ! ${1:+${fgColors[$1]:+false}}; then
			printf '%s%s%s\n' "${fgColors[$1]}" "this text is ${1}" "${miscEscapes[sgr0]}" >&3
		else
			printf '%s, %s\n' "${1:-Empty}" 'no such color.'
			typeset x y
			for x in fgColors bgColors miscEscapes; do
				typeset -a keys
				eval 'keys=("${!'"$x"'[@]}")'
				printf '%s=( ' "$x"
				for y in "${keys[@]}"; do
					eval 'printf "[%q]=%q " "$y" "${'"$x"'[$y]}"'
				done
				printf ')\n'
			done
			return 1
		fi
	else
		echo 'Failed setting color arrays.'
		return 1
	fi 3>&1 >&2
}

main "$@"

# vim: set fenc=utf-8 ff=unix ft=sh :