add colour to keyboard

wordle

@@ -33,6 +33,7 @@ function main() {
   declare -g ANSWER
   declare -g POOL='QWERTYUIOPASDFGHJKLZXCVBNM'
   declare -Ag YELLOWS
+  declare -Ag KEYS
   ANSWER=$(select_random_word)
 
   set_options "$@"
@@ -262,7 +263,12 @@ function render_keyboard() {
     elif [[ $i == 19 ]]; then
       echo -en "${NEWLINE}  "
     fi
-    echo -n "${POOL:$i:1} "
+    declare key="${POOL:$i:1}"
+    if [[ -n "${KEYS[$key]}" ]]; then
+      echo -n "${KEYS[$key]}${BOLD}${LETTER}${key}${RESET} "
+    else
+      echo -n "${key} "
+    fi
   done
   echo -en "${NEWLINE}"
 }
@@ -333,6 +339,7 @@ function check_guess() {
 
     if [[ "${_char}" == "${_answer:$c:1}" ]]; then
       greens[c]="${_char}"
+      KEYS[$_char]="${GREEN}"
       BOARD[$_row,$c]="${GREEN}${BOLD}${LETTER} ${_char} ${UNBOLD}"
       continue
     fi
@@ -341,6 +348,7 @@ function check_guess() {
       chars="${chars/${_char}/}"
       yellows[c]="${_char}"         # volatile - stores previous row yellows
       YELLOWS[$_row,$c]="${_char}"  # stores all yellow from all rounds
+      [[ "${KEYS[$_char]}" != "${GREEN}" ]] && KEYS[$_char]="${YELLOW}"
       BOARD[$_row,$c]="${YELLOW}${BOLD}${LETTER} ${_char} ${UNBOLD}"
     fi
     [[ "${ANSWER}" =~ ${_char} ]] && continue
@@ -384,6 +392,10 @@ function save_game() {
     echo "YELLOWS[$key]='${YELLOWS[$key]}'" >> "${PROGRESS_FILE}"
   done
 
+  for key in "${!KEYS[@]}"; do
+    echo "KEYS[$key]='${KEYS[$key]}'" >> "${PROGRESS_FILE}"
+  done
+
   {
     echo "ROW=${ROW}"
     echo "POOL=${POOL}"