wordle.sh

#!/usr/bin/env bash
mapfile -t words < <(grep -x '[a-z]\{5\}' "${WORDLIST:-/usr/share/dict/words}")
word=${words[RANDOM % ${#words[@]}]} pool=abcdefghijklmnopqrstuvwxyz
for ((round=1; round <= ${ROUNDS:=6}; round++)); do
	while chars="" && read -rp "$round/$ROUNDS: " guess || exit 1; do
		case " ${words[@]} " in *" ${guess,,} "*) guess=${guess,,}; break; esac
	done; for ((i=0; i < ${#word}; i++)); do
		[[ ${word:i:1} != ${guess:i:1} ]] && chars+=${word:i:1}
	done; i=0; while char=${guess:i:1} && ((i < ${#guess})) ; do
		{ [[ ${word:i++:1} == $char ]] && color=2; } ||
		{ [[ $chars == *$char* ]] && color=3 chars=${chars/$char/}; } ||
		{ color=7; }
		[[ $word != *$char* ]] && pool=${pool/$char/}
		printf '\033[30;4%dm %s \033[0m' "$color" "${char^^}"
	done
	printf ' %s\n' "$pool"
	[[ $guess == $word ]] && exit
done
printf 'The word was "%s"\n' "$word"
exit 1