treat Ctrl-D at the guess prompt like Enter

Ctrl-D doesn't move the cursor to a new line, but the retry prompts
move up a line assuming Enter was pressed, so each Ctrl-D climbed up
the screen over the keyboard and board. It also quit the game, losing
an offline game to a stray key press.

On a terminal, print the missing newline and carry on as if Enter was
pressed. Only exit when input has really ended (not a terminal), so a
closed pipe still can't spin the retry loop.

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

wordle

@@ -58,7 +58,7 @@ function main() {
   for (( ROW; ROW<HEIGHT; ROW++ )); do
     declare GUESS
     [[ "${KEYBOARD}" == 1 ]] && render_keyboard
-    GUESS=$(retrieve_guess)
+    GUESS=$(retrieve_guess) || { echo -en "${NEWLINE}"; exit 0; }
     check_guess "${GUESS}" "${ROW}" ; WIN=$?
 
     # Save before the reveal so quitting or disconnecting can't undo a guess
@@ -83,12 +83,7 @@ function main() {
     fi 
   done
 
-  [[ "${BORDER}" == 1 ]] && echo -en "${CLEAR_DOWN}${INDENT}${INDENT}"
-  echo -en "${CLEAR_LINE}${BOLD}"
-  for (( i=0; i<WIDTH; i++ )); do
-    echo -en " ${ANSWER:$i:1} "
-  done
-  echo -en "${NEWLINE}${RESET}"
+  render_answer
 
   if [[ "${ONLINE}" == 1 && "${DAILY_DONE}" != 1 ]]; then
     echo "Share/view your game with -> curl \"${URL_BASE}/${RESULT_FILE}\""
@@ -243,29 +238,54 @@ function render_board() {
   [[ "${BORDER}" == 1 ]] && echo -e "└─────────────────┘"
 }
 
+function render_answer() {
+  [[ "${BORDER}" == 1 ]] && echo -en "${CLEAR_DOWN}${INDENT}${INDENT}"
+  echo -en "${CLEAR_LINE}${BOLD}"
+  for (( i=0; i<WIDTH; i++ )); do
+    echo -en " ${ANSWER:$i:1} "
+  done
+  echo -en "${NEWLINE}${RESET}"
+}
+
+# Exits non-zero when input has ended so the caller can quit
 function retrieve_guess() {
   if  [[ -n $1 ]]; then
-    read -r -p "${CLEAR_UP1}$1: " GUESS
+    read -r -p "${CLEAR_UP1}$1: " GUESS || end_of_input
   else
-    read -r -p "${CLEAR_2END}Enter Guess: " GUESS
+    read -r -p "${CLEAR_2END}Enter Guess: " GUESS || end_of_input
   fi
 
   while [[ ${#GUESS} -ne 5 ]] || [[ ! "${GUESS,,}" =~ ^[a-z]{5}$ ]]; do
-    read -r -p "${CLEAR_UP1}Must be 5 letters: " GUESS
-  done 
+    read -r -p "${CLEAR_UP1}Must be 5 letters: " GUESS || end_of_input
+  done
   declare valid_guess
   validate_guess "${GUESS}" ; valid_guess=$?
 
-  [[ ${valid_guess} == 1 ]] && GUESS=$(retrieve_guess "Not A Valid Word")
-  [[ ${valid_guess} == 2 ]] && GUESS=$(retrieve_guess "Not A Valid Guess")
-  [[ ${valid_guess} == 3 ]] && GUESS=$(retrieve_guess "GREEN Issue")
-  [[ ${valid_guess} == 4 ]] && GUESS=$(retrieve_guess "YELLOW Issue")
-  [[ ${valid_guess} == 5 ]] && GUESS=$(retrieve_guess "POOL Issue")
-  [[ ${valid_guess} == 6 ]] && GUESS=$(retrieve_guess "NEW Issue")
+  declare message
+  declare -r pos="${HARD_MODE_POS}"
+  declare -r letter="${GUESS:pos:1}"
+  declare -ra ordinals=(1st 2nd 3rd 4th 5th)
+  [[ ${valid_guess} == 1 ]] && message="Not A Valid Word"
+  [[ ${valid_guess} == 3 ]] && message="${ordinals[pos]} letter must be ${greens[pos]}"
+  [[ ${valid_guess} == 4 ]] && message="Must contain ${yellows[pos]}"
+  [[ ${valid_guess} == 5 ]] && message="${letter^^} is not in the word"
+  [[ ${valid_guess} == 6 ]] && message="${ordinals[pos]} letter can't be ${letter^^}"
+
+  if [[ -n "${message}" ]]; then
+    GUESS=$(retrieve_guess "${message}") || exit 1
+  fi
 
   echo -n "${GUESS^^}"
 }
 
+# Called when read gets Ctrl-D. On a terminal treat it like Enter, but if
+# input has really ended (closed pipe) exit, or the retry loop spins forever
+function end_of_input() {
+  [[ -t 0 ]] || exit 1
+  # Ctrl-D doesn't move to a new line like Enter, which the prompts expect
+  echo -en "${NEWLINE}" >&2
+}
+
 function render_keyboard() {
   declare pos=$(( BORDER*2+7 ))
   echo -en "${RESET}\e[$pos;0H" 
@@ -306,6 +326,8 @@ function hard_mode_check() {
   declare GUESS=$1
 
   for (( i=0; i<WIDTH; i++ )); do
+    HARD_MODE_POS=$i  # letter position that failed, for the error message
+
     if [[ "${STRICT_HARD_MODE}" == 1 ]]; then
       [[ "${POOL}" == *${GUESS:i:1}* ]] || return 5
     fi
@@ -321,7 +343,7 @@ function hard_mode_check() {
     for (( r=ROW-1; r>=0; r-- )); do
       CHAR="${GUESS:i:1}"
       PREV_CHAR="${YELLOWS[$r,$i]}"
-      [[ "${CHAR}" == "${PREV_CHAR}" ]] && return 4
+      [[ "${CHAR}" == "${PREV_CHAR}" ]] && return 6
     done
   done
 
@@ -432,19 +454,13 @@ function save_game() {
 
 function save_result() {
   [[ "${ONLINE}" == 0 ]] && return 0
-  [[ "${ONLINE}" == 1 ]] && update_stats
   if [[ "${ONLINE}" == 1 ]] && [[ "${DAILY_DONE}" != 1 ]]; then
+    update_stats
     render_board > "${RESULT_FILE}"
     render_board > "${CUR_RESULT_FILE}"
     if [[ $WIN != 5 ]]; then
-      [[ "${BORDER}" == 1 ]] && echo -en "${CLEAR_DOWN}${INDENT}${INDENT}" >> "${RESULT_FILE}"
-      echo -en "${CLEAR_LINE}${BOLD}" >> "${RESULT_FILE}"
-      for (( i=0; i<WIDTH; i++ )); do
-        echo -en " ${ANSWER:$i:1} " >> "${RESULT_FILE}"
-        echo -en " ${ANSWER:$i:1} " >> "${CUR_RESULT_FILE}"
-      done
-      echo -en "${NEWLINE}${RESET}" >> "${RESULT_FILE}"
-      echo -en "${NEWLINE}${RESET}" >> "${CUR_RESULT_FILE}"
+      render_answer >> "${RESULT_FILE}"
+      render_answer >> "${CUR_RESULT_FILE}"
     fi
   fi
   echo 'PLAYED=1' > "${PROGRESS_FILE}"