From cbb335fec24267f2f560d376154cb14265be8998 Mon Sep 17 00:00:00 2001
From: YoshiRulz <OSSYoshiRulz@gmail.com>
Date: Sun, 11 Dec 2022 13:13:11 +1000
Subject: [PATCH] Fix Lua `require` not looking in Lua dir on Linux

see #3485
thanks to @CasualPokePlayer for research and initial implementation
---
 src/BizHawk.Client.EmuHawk/tools/Lua/Win32LuaLibraries.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/BizHawk.Client.EmuHawk/tools/Lua/Win32LuaLibraries.cs b/src/BizHawk.Client.EmuHawk/tools/Lua/Win32LuaLibraries.cs
index c1f06dec30..e2e26afe16 100644
--- a/src/BizHawk.Client.EmuHawk/tools/Lua/Win32LuaLibraries.cs
+++ b/src/BizHawk.Client.EmuHawk/tools/Lua/Win32LuaLibraries.cs
@@ -104,6 +104,14 @@ namespace BizHawk.Client.EmuHawk
 			}
 
 			_lua.RegisterFunction("print", this, typeof(Win32LuaLibraries).GetMethod(nameof(Print)));
+			if (OSTailoredCode.IsUnixHost)
+			{
+				// add %exe%/Lua to library resolution pathset (LUA_PATH)
+				// this is done already on windows, but not on linux it seems?
+				var packageTable = (LuaTable) _lua["package"];
+				var luaPath = PathEntries.LuaAbsolutePath();
+				packageTable["path"] = $"{luaPath}/?.lua;{luaPath}?/init.lua;{packageTable["path"]}";
+			}
 
 			EmulationLuaLibrary.FrameAdvanceCallback = Frameadvance;
 			EmulationLuaLibrary.YieldCallback = EmuYield;