zero pad decimal part of average guesses

An average of 3.04 was shown as 3.4 because the hundredths weren't
padded. Pad with parameter expansion to keep the script bash-only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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 "$@"
@@ -50,7 +51,7 @@ function main() {
     init_board
   fi
 
-  [[ "${ONLINE}" == 1 ]] && save_game "NO_EXIT"
+  [[ "${ONLINE}" == 1 ]] && save_game "${ROW}"
 
   render_board
 
@@ -60,14 +61,21 @@ function main() {
     GUESS=$(retrieve_guess)
     check_guess "${GUESS}" "${ROW}" ; WIN=$?
 
+    # Save before the reveal so quitting or disconnecting can't undo a guess
+    if [[ $WIN == 5 ]] || (( ROW+1 == HEIGHT )); then
+      save_result
+    elif [[ "${ONLINE}" == 1 ]]; then
+      save_game "$(( ROW+1 ))"
+    fi
+
     reveal_row "${ROW}"
 
     if [[ $WIN == 5 ]]; then
-      save_result
       echo -e "${CLEAR_DOWN}YOU WIN"
       if [[ "${ONLINE}" == 1 && "${DAILY_DONE}" != 1 ]]; then 
         echo "Share/view your game with -> curl \"${URL_BASE}/${RESULT_FILE}\""
         echo "Share/view your stats with -> curl \"${URL_BASE}/stats/${USER}\""
+        echo "Check out the new homepage in your browser -> ${URL_BASE}"
         while read -r board_line; do echo "${board_line//[A-Z]/ }"; done < "${RESULT_FILE}"
       fi
       echo "Guess - $(( ROW+1 ))/6"
@@ -82,10 +90,10 @@ function main() {
   done
   echo -en "${NEWLINE}${RESET}"
 
-  save_result
   if [[ "${ONLINE}" == 1 && "${DAILY_DONE}" != 1 ]]; then
     echo "Share/view your game with -> curl \"${URL_BASE}/${RESULT_FILE}\""
     echo "Share/view your stats with -> curl \"${URL_BASE}/stats/${USER}\""
+    echo "Check out the new homepage in your browser -> ${URL_BASE}"
     while read -r board_line; do echo "${board_line//[A-Z]/ }"; done < "${RESULT_FILE}"
   fi
   exit 0
@@ -137,9 +145,15 @@ function set_options() {
         echo -en "${CLEAR_SCREEN}"
 
         declare -g USER
-        read -r -p "Username: " USER
+        read -r -p "Username: " USER || exit 1
         USER="${USER,,}"
 
+        # Username is used in file names and URLs so only allow safe characters
+        while [[ -z "${USER}" || "${USER}" == *[!a-z0-9_]* || ${#USER} -gt 32 ]]; do
+          read -r -p "${CLEAR_UP1}Username (letters, numbers and _ only): " USER || exit 1
+          USER="${USER,,}"
+        done
+
         declare -g DAY
         DAY=$(( EPOCHSECONDS / 86400 ))
         
@@ -173,14 +187,15 @@ function set_options() {
           fi
         fi
 
-        trap save_game SIGINT
+        # Progress is saved after every guess so Ctrl-C only needs to tidy the terminal
+        trap 'echo -en "${SHOW_CURSOR}${RESET}"; exit 0' SIGINT
         ;;
       d)
         DELAY=0
         ;;
       h)
         echo -e \
-"Usage: <program_name> [OPTIONS]
+"Usage: wordle [OPTIONS]
 Play a game for Wordle
 
 Options:
@@ -260,7 +275,12 @@ 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}"
 }
@@ -331,6 +351,7 @@ function check_guess() {
 
     if [[ "${_char}" == "${_answer:$c:1}" ]]; then
       greens[c]="${_char}"
+      KEYS[$_char]="${GREEN}"
       BOARD[$_row,$c]="${GREEN}${BOLD}${LETTER} ${_char} ${UNBOLD}"
       continue
     fi
@@ -339,6 +360,7 @@ function check_guess() {
       chars="${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}" =~ ${_char} ]] && continue
@@ -370,8 +392,9 @@ function load_game() {
   source "${PROGRESS_FILE}"
 }
 
-# shellcheck disable=SC2317  # Don't warn about unreachable commands in this function
+# Takes the row the game should resume from
 function save_game() {
+  declare -r row=$1
   : > "${PROGRESS_FILE}"
 
   for key in "${!BOARD[@]}"; do
@@ -382,8 +405,21 @@ function save_game() {
     echo "YELLOWS[$key]='${YELLOWS[$key]}'" >> "${PROGRESS_FILE}"
   done
 
+  for key in "${!KEYS[@]}"; do
+    echo "KEYS[$key]='${KEYS[$key]}'" >> "${PROGRESS_FILE}"
+  done
+
+  # Previous row's hints, needed by hard_mode_check after a resume
+  for key in "${!greens[@]}"; do
+    echo "greens[$key]='${greens[$key]}'" >> "${PROGRESS_FILE}"
+  done
+
+  for key in "${!yellows[@]}"; do
+    echo "yellows[$key]='${yellows[$key]}'" >> "${PROGRESS_FILE}"
+  done
+
   {
-    echo "ROW=${ROW}"
+    echo "ROW=${row}"
     echo "POOL=${POOL}"
     echo "HARD_MODE=${HARD_MODE}"
     echo "STRICT_HARD_MODE=${STRICT_HARD_MODE}"
@@ -392,9 +428,6 @@ function save_game() {
     echo "IN_PROGRESS=1"
     [[ "${PLAYED}" == 1 ]] && echo 'PLAYED=1'
   } >> "${PROGRESS_FILE}"
-
-  echo -en "${RESET}"
-  [[ -z $1 ]] && exit 0
 }
 
 function save_result() {
@@ -451,6 +484,7 @@ function update_stats() {
     integer_part=$(( result / 100 ))
     decimal_part=$(( result % 100 ))
 
+    [[ ${decimal_part} -lt 10 ]] && decimal_part="0${decimal_part}"
     AVERAGE="${integer_part}.${decimal_part}"
   fi