Split up lua bindings a bit

```lua
local render = devilutionx.render

local function drawGreet ()
  render.string("Hello from " .. _VERSION, 10, 40)
end
Events.OnGameDrawComplete.Add(drawGreet)
```

Source/CMakeLists.txt

@@ -132,6 +132,10 @@ set(libdevilutionx_SRCS
   levels/town.cpp
   levels/trigs.cpp
 
+  lua/lua.cpp
+  lua/modules/render.cpp
+  lua/modules/log.cpp
+
   panels/charpanel.cpp
   panels/info_box.cpp
   panels/mainpanel.cpp
@@ -160,7 +164,6 @@ set(libdevilutionx_SRCS
   utils/format_int.cpp
   utils/language.cpp
   utils/logged_fstream.cpp
-  utils/lua.cpp
   utils/paths.cpp
   utils/parse_int.cpp
   utils/pcx_to_clx.cpp

Source/debug.cpp

@@ -23,6 +23,7 @@
 #include "inv.h"
 #include "levels/setmaps.h"
 #include "lighting.h"
+#include "lua/lua.hpp"
 #include "monstdat.h"
 #include "monster.h"
 #include "pack.h"
@@ -35,7 +36,6 @@
 #include "utils/file_util.h"
 #include "utils/language.h"
 #include "utils/log.hpp"
-#include "utils/lua.hpp"
 #include "utils/parse_int.hpp"
 #include "utils/str_case.hpp"
 #include "utils/str_cat.hpp"

Source/diablo.cpp

@@ -52,6 +52,7 @@
 #include "levels/trigs.h"
 #include "lighting.h"
 #include "loadsave.h"
+#include "lua/lua.hpp"
 #include "menu.h"
 #include "minitext.h"
 #include "missiles.h"
@@ -81,7 +82,6 @@
 #include "utils/console.h"
 #include "utils/display.h"
 #include "utils/language.h"
-#include "utils/lua.hpp"
 #include "utils/parse_int.hpp"
 #include "utils/paths.h"
 #include "utils/screen_reader.hpp"

Source/engine/render/scrollrt.cpp

@@ -28,6 +28,7 @@
 #include "init.h"
 #include "inv.h"
 #include "lighting.h"
+#include "lua/lua.hpp"
 #include "minitext.h"
 #include "missiles.h"
 #include "nthread.h"
@@ -46,7 +47,6 @@
 #include "utils/display.h"
 #include "utils/endian.hpp"
 #include "utils/log.hpp"
-#include "utils/lua.hpp"
 #include "utils/str_cat.hpp"
 
 #ifndef USE_SDL1

Source/lua/lua.cpp

@@ -1,16 +1,14 @@
-#include "utils/lua.hpp"
+#include "lua/lua.hpp"
 
 #include <optional>
 #include <string_view>
 
-#include <fmt/args.h>
-#include <fmt/format.h>
 #include <sol/sol.hpp>
 #include <sol/utility/to_string.hpp>
 
 #include "engine/assets.hpp"
-#include "engine/dx.h"
+#include "lua/modules/log.hpp"
-#include "engine/render/text_render.hpp"
+#include "lua/modules/render.hpp"
 #include "plrmsg.h"
 #include "utils/console.h"
 #include "utils/log.hpp"
@@ -75,68 +73,6 @@ void LuaPanic(sol::optional<std::string> message)
 	    message.value_or("unknown error"));
 }
 
-void LuaLogMessage(LogPriority priority, std::string_view fmt, sol::variadic_args args)
-{
-	std::string formatted;
-	FMT_TRY
-	{
-		fmt::dynamic_format_arg_store<fmt::format_context> store;
-		for (const sol::stack_proxy arg : args) {
-			switch (arg.get_type()) {
-			case sol::type::boolean:
-				store.push_back(arg.as<bool>());
-				break;
-			case sol::type::number:
-				if (lua_isinteger(arg.lua_state(), arg.stack_index())) {
-					store.push_back(lua_tointeger(arg.lua_state(), arg.stack_index()));
-				} else {
-					store.push_back(lua_tonumber(arg.lua_state(), arg.stack_index()));
-				}
-				break;
-			case sol::type::string:
-				store.push_back(arg.as<std::string>());
-				break;
-			default:
-				store.push_back(sol::utility::to_string(sol::stack_object(arg)));
-				break;
-			}
-		}
-		formatted = fmt::vformat(fmt, store);
-	}
-	FMT_CATCH(const fmt::format_error &e)
-	{
-#if FMT_EXCEPTIONS
-		// e.what() is undefined if exceptions are disabled, so we wrap the whole block
-		// with an `FMT_EXCEPTIONS` check.
-		std::string error = StrCat("Format error, fmt: ", fmt, " error: ", e.what());
-		SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION, "%s", error.c_str());
-		return;
-#endif
-	}
-	SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, static_cast<SDL_LogPriority>(priority), "%s", formatted.c_str());
-}
-
-void LuaLog(std::string_view fmt, sol::variadic_args args)
-{
-	LuaLogMessage(LogPriority::Info, fmt, std::move(args));
-}
-void LuaLogVerbose(std::string_view fmt, sol::variadic_args args)
-{
-	LuaLogMessage(LogPriority::Verbose, fmt, std::move(args));
-}
-void LuaLogDebug(std::string_view fmt, sol::variadic_args args)
-{
-	LuaLogMessage(LogPriority::Debug, fmt, std::move(args));
-}
-void LuaLogWarn(std::string_view fmt, sol::variadic_args args)
-{
-	LuaLogMessage(LogPriority::Warn, fmt, std::move(args));
-}
-void LuaLogError(std::string_view fmt, sol::variadic_args args)
-{
-	LuaLogMessage(LogPriority::Error, fmt, std::move(args));
-}
-
 } // namespace
 
 void Sol2DebugPrintStack(lua_State *state)
@@ -174,13 +110,9 @@ void LuaInitialize()
 	// Registering devilutionx object table
 	lua.create_named_table(
 	    "devilutionx",
-	    "message", [](std::string_view text) { EventPlrMsg(text, UiFlags::ColorRed); },
+	    "log", LuaLogModule(lua),
-	    "drawString", [](std::string_view text, int x, int y) { DrawString(GlobalBackBuffer(), text, { x, y }); },
+	    "render", LuaRenderModule(lua),
-	    "log", LuaLog,
+	    "message", [](std::string_view text) { EventPlrMsg(text, UiFlags::ColorRed); });
-	    "logVerbose", LuaLogVerbose,
-	    "logDebug", LuaLogDebug,
-	    "logWarn", LuaLogWarn,
-	    "logError", LuaLogError);
 
 	RunScript("lua/init.lua");
 	RunScript("lua/user.lua");

Source/lua/modules/log.cpp

@@ -0,0 +1,93 @@
+#include "lua/modules/log.hpp"
+
+#include <SDL.h>
+
+#include <fmt/args.h>
+#include <fmt/format.h>
+#include <sol/sol.hpp>
+#include <sol/utility/to_string.hpp>
+
+#include "utils/log.hpp"
+
+#ifdef USE_SDL1
+#include "utils/sdl2_to_1_2_backports.h"
+#endif
+
+namespace devilution {
+
+namespace {
+
+void LuaLogMessage(LogPriority priority, std::string_view fmt, sol::variadic_args args)
+{
+	std::string formatted;
+	FMT_TRY
+	{
+		fmt::dynamic_format_arg_store<fmt::format_context> store;
+		for (const sol::stack_proxy arg : args) {
+			switch (arg.get_type()) {
+			case sol::type::boolean:
+				store.push_back(arg.as<bool>());
+				break;
+			case sol::type::number:
+				if (lua_isinteger(arg.lua_state(), arg.stack_index())) {
+					store.push_back(lua_tointeger(arg.lua_state(), arg.stack_index()));
+				} else {
+					store.push_back(lua_tonumber(arg.lua_state(), arg.stack_index()));
+				}
+				break;
+			case sol::type::string:
+				store.push_back(arg.as<std::string>());
+				break;
+			default:
+				store.push_back(sol::utility::to_string(sol::stack_object(arg)));
+				break;
+			}
+		}
+		formatted = fmt::vformat(fmt, store);
+	}
+	FMT_CATCH(const fmt::format_error &e)
+	{
+#if FMT_EXCEPTIONS
+		// e.what() is undefined if exceptions are disabled, so we wrap the whole block
+		// with an `FMT_EXCEPTIONS` check.
+		std::string error = StrCat("Format error, fmt: ", fmt, " error: ", e.what());
+		SDL_LogCritical(SDL_LOG_CATEGORY_APPLICATION, "%s", error.c_str());
+		return;
+#endif
+	}
+	SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, static_cast<SDL_LogPriority>(priority), "%s", formatted.c_str());
+}
+
+void LuaLogInfo(std::string_view fmt, sol::variadic_args args)
+{
+	LuaLogMessage(LogPriority::Info, fmt, std::move(args));
+}
+void LuaLogVerbose(std::string_view fmt, sol::variadic_args args)
+{
+	LuaLogMessage(LogPriority::Verbose, fmt, std::move(args));
+}
+void LuaLogDebug(std::string_view fmt, sol::variadic_args args)
+{
+	LuaLogMessage(LogPriority::Debug, fmt, std::move(args));
+}
+void LuaLogWarn(std::string_view fmt, sol::variadic_args args)
+{
+	LuaLogMessage(LogPriority::Warn, fmt, std::move(args));
+}
+void LuaLogError(std::string_view fmt, sol::variadic_args args)
+{
+	LuaLogMessage(LogPriority::Error, fmt, std::move(args));
+}
+} // namespace
+
+sol::table LuaLogModule(sol::state_view &lua)
+{
+	return lua.create_table_with(
+	    "info", LuaLogInfo,
+	    "verbose", LuaLogVerbose,
+	    "debug", LuaLogDebug,
+	    "warn", LuaLogWarn,
+	    "error", LuaLogError);
+}
+
+} // namespace devilution

Source/lua/modules/log.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <sol/sol.hpp>
+
+namespace devilution {
+
+sol::table LuaLogModule(sol::state_view &lua);
+
+} // namespace devilution

Source/lua/modules/render.cpp

@@ -0,0 +1,16 @@
+#include "lua/modules/render.hpp"
+
+#include <sol/sol.hpp>
+
+#include "engine/dx.h"
+#include "engine/render/text_render.hpp"
+
+namespace devilution {
+
+sol::table LuaRenderModule(sol::state_view &lua)
+{
+	return lua.create_table_with(
+	    "string", [](std::string_view text, int x, int y) { DrawString(GlobalBackBuffer(), text, { x, y }); });
+}
+
+} // namespace devilution

Source/lua/modules/render.hpp

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <sol/sol.hpp>
+
+namespace devilution {
+
+sol::table LuaRenderModule(sol::state_view &lua);
+
+} // namespace devilution

Source/utils/log.hpp

@@ -9,7 +9,7 @@
 #include "utils/str_cat.hpp"
 
 #ifdef USE_SDL1
-#include "sdl2_to_1_2_backports.h"
+#include "utils/sdl2_to_1_2_backports.h"
 #endif
 
 namespace devilution {

test/timedemo_test.cpp

@@ -4,11 +4,11 @@
 
 #include "diablo.h"
 #include "engine/demomode.h"
+#include "lua/lua.hpp"
 #include "options.h"
 #include "pfile.h"
 #include "playerdat.hpp"
 #include "utils/display.h"
-#include "utils/lua.hpp"
 #include "utils/paths.h"
 
 using namespace devilution;