Add love.system.getTheme()

This function returns wetever the device theme is dark theme, light theme, or unknown.

src/modules/system/System.cpp

@@ -89,6 +89,11 @@ bool System::getConstant(System::PowerState in, const char *&out)
 	return powerStates.find(in, out);
 }
 
+bool System::getConstant(System::SystemTheme in, const char *&out)
+{
+	return systemThemes.find(in, out);
+}
+
 StringMap<System::PowerState, System::POWER_MAX_ENUM>::Entry System::powerEntries[] =
 {
 	{"unknown", System::POWER_UNKNOWN},
@@ -100,5 +105,14 @@ StringMap<System::PowerState, System::POWER_MAX_ENUM>::Entry System::powerEntrie
 
 StringMap<System::PowerState, System::POWER_MAX_ENUM> System::powerStates(System::powerEntries, sizeof(System::powerEntries));
 
+StringMap<System::SystemTheme, System::THEME_MAX_ENUM>::Entry System::systemThemeEntries[] =
+{
+	{"unknown", System::THEME_UNKNOWN},
+	{"light", System::THEME_LIGHT},
+	{"dark", System::THEME_DARK}
+};
+
+StringMap<System::SystemTheme, System::THEME_MAX_ENUM> System::systemThemes(System::systemThemeEntries, sizeof(System::systemThemeEntries));
+
 } // system
 } // love

src/modules/system/System.h

@@ -48,6 +48,14 @@ public:
 		POWER_MAX_ENUM
 	};
 
+	enum SystemTheme
+	{
+		THEME_UNKNOWN,
+		THEME_LIGHT,
+		THEME_DARK,
+		THEME_MAX_ENUM
+	};
+
 	System(const char *name);
 	virtual ~System() {}
 
@@ -91,6 +99,13 @@ public:
 	 **/
 	virtual PowerState getPowerInfo(int &seconds, int &percent) const = 0;
 
+	/**
+	 * Get information about the system theme.
+	 *
+	 * @return System theme, which can be either light, dark, or unknown.
+	 **/
+	virtual SystemTheme getTheme() const = 0;
+
 	/**
 	 * Opens the specified URL with the user's default program to handle that
 	 * particular URL type.
@@ -131,11 +146,14 @@ public:
 
 	static bool getConstant(const char *in, PowerState &out);
 	static bool getConstant(PowerState in, const char *&out);
+	static bool getConstant(SystemTheme in, const char *&out);
 
 private:
 
 	static StringMap<PowerState, POWER_MAX_ENUM>::Entry powerEntries[];
 	static StringMap<PowerState, POWER_MAX_ENUM> powerStates;
+	static StringMap<SystemTheme, THEME_MAX_ENUM>::Entry systemThemeEntries[];
+	static StringMap<SystemTheme, THEME_MAX_ENUM> systemThemes;
 
 }; // System
 

src/modules/system/sdl/System.cpp

@@ -93,6 +93,15 @@ love::system::System::PowerState System::getPowerInfo(int &seconds, int &percent
 	return state;
 }
 
+System::SystemTheme System::getTheme() const
+{
+	SDL_SystemTheme sdlstate = SDL_GetSystemTheme();
+	SystemTheme state = THEME_UNKNOWN;
+	systemThemes.find(sdlstate, state);
+
+	return state;
+}
+
 bool System::openURL(const std::string &url) const
 {
 	return SDL_OpenURL(url.c_str());
@@ -128,6 +137,15 @@ EnumMap<System::PowerState, SDL_PowerState, System::POWER_MAX_ENUM>::Entry Syste
 
 EnumMap<System::PowerState, SDL_PowerState, System::POWER_MAX_ENUM> System::powerStates(System::powerEntries, sizeof(System::powerEntries));
 
+EnumMap<System::SystemTheme, SDL_SystemTheme, System::THEME_MAX_ENUM>::Entry System::systemThemeEntries[] =
+{
+	{System::THEME_UNKNOWN, SDL_SYSTEM_THEME_UNKNOWN},
+	{System::THEME_LIGHT, SDL_SYSTEM_THEME_LIGHT},
+	{System::THEME_DARK, SDL_SYSTEM_THEME_DARK},
+};
+
+EnumMap<System::SystemTheme, SDL_SystemTheme, System::THEME_MAX_ENUM> System::systemThemes(System::systemThemeEntries, sizeof(System::systemThemeEntries));
+
 } // sdl
 } // system
 } // love

src/modules/system/sdl/System.h

@@ -27,6 +27,7 @@
 
 // SDL
 #include <SDL3/SDL_power.h>
+#include <SDL3/SDL_system.h>
 
 namespace love
 {
@@ -49,6 +50,7 @@ public:
 	std::string getClipboardText() const override;
 
 	PowerState getPowerInfo(int &seconds, int &percent) const override;
+	SystemTheme getTheme() const override;
 	bool openURL(const std::string &url) const override;
 	std::vector<std::string> getPreferredLocales() const override;
 
@@ -58,6 +60,8 @@ private:
 
 	static EnumMap<PowerState, SDL_PowerState, POWER_MAX_ENUM>::Entry powerEntries[];
 	static EnumMap<PowerState, SDL_PowerState, POWER_MAX_ENUM> powerStates;
+	static EnumMap<SystemTheme, SDL_SystemTheme, THEME_MAX_ENUM>::Entry systemThemeEntries[];
+	static EnumMap<SystemTheme, SDL_SystemTheme, THEME_MAX_ENUM> systemThemes;
 
 }; // System
 

src/modules/system/wrap_System.cpp

@@ -87,6 +87,15 @@ int w_getPowerInfo(lua_State *L)
 	return 3;
 }
 
+int w_getTheme(lua_State *L)
+{
+	System::SystemTheme theme = instance()->getTheme();
+	const char *str = "unknown";
+	System::getConstant(theme, str);
+	lua_pushstring(L, str);
+	return 1;
+}
+
 int w_openURL(lua_State *L)
 {
 	std::string url = luax_checkstring(L, 1);
@@ -131,6 +140,7 @@ static const luaL_Reg functions[] =
 	{ "setClipboardText", w_setClipboardText },
 	{ "getClipboardText", w_getClipboardText },
 	{ "getPowerInfo", w_getPowerInfo },
+	{ "getTheme", w_getTheme },
 	{ "openURL", w_openURL },
 	{ "vibrate", w_vibrate },
 	{ "hasBackgroundMusic", w_hasBackgroundMusic },