Auto-detect locale on first run

src/openrct2/config/Config.cpp

@@ -133,7 +133,7 @@ namespace Config
             model->autosave_frequency = reader->GetSint32("autosave", AUTOSAVE_EVERY_5MINUTES);
             model->confirmation_prompt = reader->GetBoolean("confirmation_prompt", false);
             model->construction_marker_colour = reader->GetBoolean("construction_marker_colour", false);
-            model->currency_format = reader->GetEnum<sint32>("currency_format", CURRENCY_POUNDS, Enum_Currency);
+            model->currency_format = reader->GetEnum<sint32>("currency_format", platform_get_locale_currency(), Enum_Currency);
             model->custom_currency_rate = reader->GetSint32("custom_currency_rate", 10);
             model->custom_currency_affix = reader->GetEnum<sint32>("custom_currency_affix", CURRENCY_SUFFIX, Enum_CurrencySymbolAffix);
             model->custom_currency_symbol = reader->GetCString("custom_currency_symbol", "Ctm");
@@ -144,13 +144,13 @@ namespace Config
             model->rct1_path = reader->GetCString("rct1_path", nullptr);
             model->rct2_path = reader->GetCString("game_path", nullptr);
             model->landscape_smoothing = reader->GetBoolean("landscape_smoothing", true);
-            model->language = reader->GetEnum<sint32>("language", LANGUAGE_ENGLISH_UK, Enum_LanguageEnum);
-            model->measurement_format = reader->GetEnum<sint32>("measurement_format", MEASUREMENT_FORMAT_METRIC, Enum_MeasurementFormat);
+            model->language = reader->GetEnum<sint32>("language", platform_get_locale_language(), Enum_LanguageEnum);
+            model->measurement_format = reader->GetEnum<sint32>("measurement_format", platform_get_locale_measurement_format(), Enum_MeasurementFormat);
             model->play_intro = reader->GetBoolean("play_intro", false);
             model->save_plugin_data = reader->GetBoolean("save_plugin_data", true);
             model->debugging_tools = reader->GetBoolean("debugging_tools", false);
             model->show_height_as_units = reader->GetBoolean("show_height_as_units", false);
-            model->temperature_format = reader->GetEnum<sint32>("temperature_format", TEMPERATURE_FORMAT_C, Enum_Temperature);
+            model->temperature_format = reader->GetEnum<sint32>("temperature_format", platform_get_locale_temperature_format(), Enum_Temperature);
             model->window_height = reader->GetSint32("window_height", -1);
             model->window_snap_proximity = reader->GetSint32("window_snap_proximity", 5);
             model->window_width = reader->GetSint32("window_width", -1);
@@ -161,7 +161,7 @@ namespace Config
             model->test_unfinished_tracks = reader->GetBoolean("test_unfinished_tracks", false);
 
             model->no_test_crashes = reader->GetBoolean("no_test_crashes", false);
-            model->date_format = reader->GetEnum<sint32>("date_format", DATE_FORMAT_DAY_MONTH_YEAR, Enum_DateFormat);
+            model->date_format = reader->GetEnum<sint32>("date_format", platform_get_locale_date_format(), Enum_DateFormat);
             model->auto_staff_placement = reader->GetBoolean("auto_staff", true);
             model->handymen_mow_default = reader->GetBoolean("handymen_mow_default", false);
             model->default_inspection_interval = reader->GetSint32("default_inspection_interval", 2);

src/openrct2/platform/platform.h

@@ -201,6 +201,8 @@ uint8 platform_get_currency_value(const char *currencyCode);
 uint16 platform_get_locale_language();
 uint8 platform_get_locale_measurement_format();
 uint8 platform_get_locale_temperature_format();
+uint8 platform_get_locale_date_format();
+
 #ifndef NO_TTF
 bool platform_get_font_path(TTFFontDescriptor *font, utf8 *buffer, size_t size);
 #endif // NO_TTF

src/openrct2/platform/windows.c

@@ -30,8 +30,10 @@
 #include <shlobj.h>
 #include <SDL_syswm.h>
 #include <sys/stat.h>
+#include <wchar.h>
 
 #include "../config/Config.h"
+#include "../localisation/date.h"
 #include "../localisation/language.h"
 #include "../OpenRCT2.h"
 #include "../util/util.h"
@@ -949,6 +951,50 @@ uint8 platform_get_locale_temperature_format()
 		return TEMPERATURE_FORMAT_C;
 }
 
+uint8 platform_get_locale_date_format()
+{
+	// Retrieve short date format, eg "MM/dd/yyyy"
+	wchar_t dateFormat[20];
+	if (GetLocaleInfoEx(LOCALE_NAME_USER_DEFAULT, LOCALE_SSHORTDATE, dateFormat, sizeof(dateFormat)) == 0)
+	{
+		return DATE_FORMAT_DAY_MONTH_YEAR;
+	}
+
+	// The only valid characters for format types are: dgyM
+	// We try to find 3 strings of format types, ignore any characters in between.
+	// We also ignore 'g', as it represents 'era' and we don't have that concept
+	// in our date formats.
+	// https://msdn.microsoft.com/en-us/library/windows/desktop/dd317787(v=vs.85).aspx
+	//
+	wchar_t first[sizeof(dateFormat)];
+	wchar_t second[sizeof(dateFormat)];
+	if (swscanf(dateFormat, L"%l[dyM]%*l[^dyM]%l[dyM]%*l[^dyM]%*l[dyM]", first, second) != 2) {
+		return DATE_FORMAT_DAY_MONTH_YEAR;
+	}
+
+	if (wcsncmp(L"d", first, 1) == 0)
+	{
+		return DATE_FORMAT_DAY_MONTH_YEAR;
+	}
+	else if (wcsncmp(L"M", first, 1) == 0)
+	{
+		return DATE_FORMAT_MONTH_DAY_YEAR;
+	}
+	else if (wcsncmp(L"y", first, 1) == 0)
+	{
+		if (wcsncmp(L"d", second, 1) == 0) {
+			return DATE_FORMAT_YEAR_DAY_MONTH;
+		}
+		else {
+			// Closest possible option
+			return DATE_FORMAT_YEAR_MONTH_DAY;
+		}	
+	}
+	
+	// Default fallback
+	return DATE_FORMAT_DAY_MONTH_YEAR;
+}
+
 bool platform_check_steam_overlay_attached()
 {
 	return GetModuleHandle("GameOverlayRenderer.dll") != NULL;