update

bashrc.d/90-memory-question.bash

@@ -1,6 +1,8 @@
 # shellcheck shell=bash
 
 _memory_file="${XDG_CONFIG_HOME:-$HOME/.config}/bash/memory.tsv"
+_memory_state_dir="${XDG_STATE_HOME:-$HOME/.local/state}/bash"
+_memory_state_file="$_memory_state_dir/memory-question"
 _memory_question_color='\033[38;5;11m'
 _memory_names=()
 _memory_questions=()
@@ -40,18 +42,141 @@ else
 fi
 
 if [[ $_memory_invalid -eq 0 && ${#_memory_names[@]} -gt 0 ]]; then
-	_memory_day=$(date -d "$(date +%F) 00:00" +%s)
-	_memory_index=$(( (_memory_day / 86400) % ${#_memory_names[@]} ))
-	_MEMORY_ANSWER=${_memory_answers[$_memory_index]}
+	_memory_load_state() {
+		local -a fields=() state_deck=()
+		local state_date state_index item
+		local -A state_seen=()
+
+		[[ -r "$_memory_state_file" ]] || return 1
+		IFS=$'\t' read -r -a fields < "$_memory_state_file"
+		[[ ${#fields[@]} -eq $((${#_memory_names[@]} + 2)) ]] || return 1
+
+		state_date=${fields[0]}
+		state_index=${fields[1]}
+		state_deck=("${fields[@]:2}")
+		[[ $state_index =~ ^[0-9]+$ && $state_index -lt ${#state_deck[@]} ]] || return 1
+
+		for item in "${state_deck[@]}"; do
+			[[ -n ${_memory_seen[$item]:-} && -z ${state_seen[$item]:-} ]] || return 1
+			state_seen[$item]=1
+		done
+
+		_memory_state_date=$state_date
+		_memory_index=$state_index
+		_memory_deck=("${state_deck[@]}")
+	}
+
+	_memory_shuffle_deck() {
+		local previous_name=$1
+		local i j swap
+
+		_memory_deck=("${_memory_names[@]}")
+		for ((i = ${#_memory_deck[@]} - 1; i > 0; i--)); do
+			j=$((RANDOM % (i + 1)))
+			swap=${_memory_deck[$i]}
+			_memory_deck[i]=${_memory_deck[j]}
+			_memory_deck[j]=$swap
+		done
+
+		if [[ ${#_memory_deck[@]} -gt 1 && ${_memory_deck[0]} == "$previous_name" ]]; then
+			swap=${_memory_deck[0]}
+			_memory_deck[0]=${_memory_deck[1]}
+			_memory_deck[1]=$swap
+		fi
+
+		_memory_index=0
+	}
+
+	_memory_save_state() {
+		local state_tmp="${_memory_state_file}.$$"
+		local item
+
+		mkdir -p "$_memory_state_dir" || return 1
+		{
+			printf '%s\t%s' "$_memory_state_date" "$_memory_index"
+			for item in "${_memory_deck[@]}"; do
+				printf '\t%s' "$item"
+			done
+			printf '\n'
+		} > "$state_tmp" || return 1
+		mv -f -- "$state_tmp" "$_memory_state_file"
+	}
+
+	_memory_select_current() {
+		local current_name=${_memory_deck[$_memory_index]}
+		local i
+
+		for ((i = 0; i < ${#_memory_names[@]}; i++)); do
+			if [[ ${_memory_names[$i]} == "$current_name" ]]; then
+				_MEMORY_ANSWER=${_memory_answers[$i]}
+				_MEMORY_QUESTION=${_memory_questions[$i]}
+				return
+			fi
+		done
+
+		return 1
+	}
+
+	_memory_advance() {
+		local previous_name=${_memory_deck[$_memory_index]}
+
+		((_memory_index++))
+		if [[ $_memory_index -ge ${#_memory_deck[@]} ]]; then
+			_memory_shuffle_deck "$previous_name"
+		fi
+
+		_memory_select_current
+		_memory_save_state
+	}
+
+	_memory_sync_day() {
+		local today
+
+		today=$(date +%F)
+		[[ $_memory_state_date != "$today" ]] || return 0
+
+		_memory_state_date=$today
+		_memory_advance
+	}
+
+	_memory_print_question() {
+		printf '%b%s%b (answerpls, refreshpls)\n\n' \
+			"$_memory_question_color" "$_MEMORY_QUESTION" "$_NC"
+	}
+
+	_memory_today=$(date +%F)
+	if _memory_load_state; then
+		_memory_select_current
+		_memory_sync_day
+	else
+		_memory_state_date=$_memory_today
+		_memory_shuffle_deck ''
+		_memory_select_current
+		_memory_save_state
+	fi
 
 	answerpls() {
 		printf '%s\n' "$_MEMORY_ANSWER"
 	}
 
-	printf '%b%s%b (answerpls)\n\n' \
-		"$_memory_question_color" "${_memory_questions[$_memory_index]}" "$_NC"
+	refreshpls() {
+		if _memory_load_state; then
+			_memory_select_current
+		else
+			_memory_state_date=$(date +%F)
+			_memory_shuffle_deck "${_memory_deck[$_memory_index]:-}"
+			_memory_select_current
+			_memory_save_state
+		fi
+
+		_memory_sync_day
+		_memory_advance
+		_memory_print_question
+	}
+
+	_memory_print_question
 fi
 
-unset _memory_file _memory_question_color _memory_names _memory_questions _memory_answers
-unset _memory_seen _memory_invalid _memory_line_number _memory_name _memory_question
-unset _memory_answer _memory_extra _memory_day _memory_index
+unset _memory_file
+unset _memory_invalid _memory_line_number _memory_name _memory_question
+unset _memory_answer _memory_extra _memory_today