Allow setting autosave interval to a custom number of real-time minutes

src/lang/english.txt

@@ -1037,10 +1037,13 @@ STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_3_MONTHS               :Every 3 months
 STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_6_MONTHS               :Every 6 months
 STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_12_MONTHS              :Every 12 months
 STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_DAYS_CUSTOM_LABEL      :Custom interval (days)
+STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_MINUTES_CUSTOM_LABEL   :Custom interval (real-time minutes)
 STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_DAYS_CUSTOM            :Every {COMMA}{NBSP}days
 STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_DAYS_CUSTOM_SINGULAR   :Every day
+STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_MINUTES_CUSTOM         :Every {COMMA} real-time minutes
 
-STR_GAME_OPTIONS_AUTOSAVE_QUERY_CAPT                            :{WHITE}Autosave interval in days
+STR_GAME_OPTIONS_AUTOSAVE_DAYS_QUERY_CAPT                       :{WHITE}Autosave interval in days
+STR_GAME_OPTIONS_AUTOSAVE_MINUTES_QUERY_CAPT                    :{WHITE}Autosave interval in real-time minutes
 
 STR_GAME_OPTIONS_LANGUAGE                                       :{BLACK}Language
 STR_GAME_OPTIONS_LANGUAGE_TOOLTIP                               :{BLACK}Select the interface language to use
@@ -1796,6 +1799,9 @@ STR_CONFIG_SETTING_AUTOSAVE_HELPTEXT                            :Select interval
 STR_CONFIG_SETTING_AUTOSAVE_CUSTOM_DAYS                         :Custom autosave interval in days: {STRING2}
 STR_CONFIG_SETTING_AUTOSAVE_CUSTOM_DAYS_HELPTEXT                :Set custom days interval between automatic game saves
 
+STR_CONFIG_SETTING_AUTOSAVE_CUSTOM_MINUTES                      :Custom autosave interval in real-time minutes: {STRING2}
+STR_CONFIG_SETTING_AUTOSAVE_CUSTOM_MINUTES_HELPTEXT             :Set custom real-time minutes of game time interval between automatic game saves
+
 STR_CONFIG_SETTING_AUTOSAVE_ON_NETWORK_DISCONNECT               :Autosave on network disconnection: {STRING2}
 STR_CONFIG_SETTING_AUTOSAVE_ON_NETWORK_DISCONNECT_HELPTEXT      :When enabled, multiplayer clients automatically save the game when disconnected from the server
 

src/openttd.cpp

@@ -1893,6 +1893,14 @@ void StateGameLoop()
 		_tick_skip_counter++;
 		_scaled_tick_counter++; // This must update in lock-step with _tick_skip_counter, such that it always matches what SetScaledTickVariables would return.
 		_scaled_date_ticks++;   // "
+
+		if (_settings_client.gui.autosave == 6 && !(_game_mode == GM_MENU || _game_mode == GM_BOOTSTRAP) &&
+				(_scaled_date_ticks % (_settings_client.gui.autosave_custom_minutes * (60000 / MILLISECONDS_PER_TICK))) == 0) {
+			_do_autosave = true;
+			_check_special_modes = true;
+			SetWindowDirty(WC_STATUS_BAR, 0);
+		}
+
 		if (_tick_skip_counter < _settings_game.economy.day_length_factor) {
 			AnimateAnimatedTiles();
 			CallVehicleTicks();

src/settings_gui.cpp

@@ -62,6 +62,7 @@ static const StringID _autosave_dropdown[] = {
 	STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_6_MONTHS,
 	STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_12_MONTHS,
 	STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_DAYS_CUSTOM_LABEL,
+	STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_MINUTES_CUSTOM_LABEL,
 	INVALID_STRING_ID,
 };
 
@@ -173,6 +174,7 @@ struct GameOptionsWindow : Window {
 	enum class QueryTextItem {
 		None,
 		AutosaveCustomDays,
+		AutosaveCustomRealTimeMinutes,
 	};
 	QueryTextItem current_query_text_item = QueryTextItem::None;
 
@@ -319,6 +321,9 @@ struct GameOptionsWindow : Window {
 				if (_settings_client.gui.autosave == 5) {
 					SetDParam(0, _settings_client.gui.autosave_custom_days == 1 ? STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_DAYS_CUSTOM_SINGULAR : STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_DAYS_CUSTOM);
 					SetDParam(1, _settings_client.gui.autosave_custom_days);
+				} else if (_settings_client.gui.autosave == 6) {
+					SetDParam(0, STR_GAME_OPTIONS_AUTOSAVE_DROPDOWN_EVERY_MINUTES_CUSTOM);
+					SetDParam(1, _settings_client.gui.autosave_custom_minutes);
 				} else {
 					SetDParam(0, _autosave_dropdown[_settings_client.gui.autosave]);
 				}
@@ -553,7 +558,11 @@ struct GameOptionsWindow : Window {
 				if (index == 5) {
 					this->current_query_text_item = QueryTextItem::AutosaveCustomDays;
 					SetDParam(0, _settings_client.gui.autosave_custom_days);
-					ShowQueryString(STR_JUST_INT, STR_GAME_OPTIONS_AUTOSAVE_QUERY_CAPT, 4, this, CS_NUMERAL, QSF_ACCEPT_UNCHANGED);
+					ShowQueryString(STR_JUST_INT, STR_GAME_OPTIONS_AUTOSAVE_DAYS_QUERY_CAPT, 4, this, CS_NUMERAL, QSF_ACCEPT_UNCHANGED);
+				} else if (index == 6) {
+					this->current_query_text_item = QueryTextItem::AutosaveCustomRealTimeMinutes;
+					SetDParam(0, _settings_client.gui.autosave_custom_minutes);
+					ShowQueryString(STR_JUST_INT, STR_GAME_OPTIONS_AUTOSAVE_MINUTES_QUERY_CAPT, 4, this, CS_NUMERAL, QSF_ACCEPT_UNCHANGED);
 				} else {
 					_settings_client.gui.autosave = index;
 					this->SetDirty();
@@ -650,6 +659,12 @@ struct GameOptionsWindow : Window {
 					_settings_client.gui.autosave_custom_days = Clamp(value, 1, 4000);
 					this->SetDirty();
 					break;
+
+				case QueryTextItem::AutosaveCustomRealTimeMinutes:
+					_settings_client.gui.autosave = 6;
+					_settings_client.gui.autosave_custom_minutes = Clamp(value, 1, 8000);
+					this->SetDirty();
+					break;
 			}
 		}
 	}
@@ -1883,6 +1898,7 @@ static SettingsContainer &GetSettingsTree()
 			interface->Add(new SettingEntry("gui.fast_forward_speed_limit"));
 			interface->Add(new SettingEntry("gui.autosave"));
 			interface->Add(new ConditionallyHiddenSettingEntry("gui.autosave_custom_days", []() -> bool { return _settings_client.gui.autosave != 5; }));
+			interface->Add(new ConditionallyHiddenSettingEntry("gui.autosave_custom_minutes", []() -> bool { return _settings_client.gui.autosave != 6; }));
 			interface->Add(new SettingEntry("gui.autosave_on_network_disconnect"));
 			interface->Add(new SettingEntry("gui.savegame_overwrite_confirm"));
 			interface->Add(new SettingEntry("gui.toolbar_pos"));

src/settings_type.h

@@ -148,6 +148,7 @@ struct GUISettings : public TimeSettings {
 	ZoomLevel sprite_zoom_min;               ///< maximum zoom level at which higher-resolution alternative sprites will be used (if available) instead of scaling a lower resolution sprite
 	byte   autosave;                         ///< how often should we do autosaves?
 	uint16 autosave_custom_days;             ///< custom autosave interval in days
+	uint16 autosave_custom_minutes;          ///< custom autosave interval in real-time minutes
 	bool   threaded_saves;                   ///< should we do threaded saves?
 	bool   keep_all_autosave;                ///< name the autosave in a different way
 	bool   autosave_on_exit;                 ///< save an autosave when you quit the game, but do not ask "Do you really want to quit?"

src/table/settings/gameopt_settings.ini

@@ -27,7 +27,7 @@ static_assert(_locale_currencies.size() == CURRENCY_END);
 static constexpr std::initializer_list<const char*> _locale_units{"imperial", "metric", "si", "gameunits"};
 static constexpr std::initializer_list<const char*> _town_names{"english", "french", "german", "american", "latin", "silly", "swedish", "dutch", "finnish", "polish", "slovak", "norwegian", "hungarian", "austrian", "romanian", "czech", "swiss", "danish", "turkish", "italian", "catalan"};
 static constexpr std::initializer_list<const char*> _climates{"temperate", "arctic", "tropic", "toyland"};
-static constexpr std::initializer_list<const char*> _autosave_interval{"off", "monthly", "quarterly", "half year", "yearly", "custom_days"};
+static constexpr std::initializer_list<const char*> _autosave_interval{"off", "monthly", "quarterly", "half year", "yearly", "custom_days", "custom_realtime_minutes"};
 static constexpr std::initializer_list<const char*> _roadsides{"left", "right"};
 static constexpr std::initializer_list<const char*> _savegame_date{"long", "short", "iso"};
 static constexpr std::initializer_list<const char*> _savegame_overwrite_confirm{"no", "different", "not same", "yes"};

src/table/settings/settings.ini

@@ -4085,7 +4085,7 @@ var      = gui.autosave
 type     = SLE_UINT8
 flags    = SF_NOT_IN_SAVE | SF_NO_NETWORK_SYNC | SF_GUI_DROPDOWN
 def      = 1
-max      = 5
+max      = 6
 full     = _autosave_interval
 str      = STR_CONFIG_SETTING_AUTOSAVE
 strhelp  = STR_CONFIG_SETTING_AUTOSAVE_HELPTEXT
@@ -4106,6 +4106,19 @@ strhelp  = STR_CONFIG_SETTING_AUTOSAVE_CUSTOM_DAYS_HELPTEXT
 strval   = STR_TIMETABLE_DAYS
 cat      = SC_BASIC
 
+[SDTC_VAR]
+var      = gui.autosave_custom_minutes
+type     = SLE_UINT16
+flags    = SF_NOT_IN_SAVE | SF_NO_NETWORK_SYNC
+def      = 30
+min      = 3
+max      = 8000
+interval = 10
+str      = STR_CONFIG_SETTING_AUTOSAVE_CUSTOM_MINUTES
+strhelp  = STR_CONFIG_SETTING_AUTOSAVE_CUSTOM_MINUTES_HELPTEXT
+strval   = STR_TIMETABLE_MINUTES
+cat      = SC_BASIC
+
 [SDTC_BOOL]
 var      = gui.threaded_saves
 flags    = SF_NOT_IN_SAVE | SF_NO_NETWORK_SYNC