Some improvements and fixes for raylua.dll/raylua.so.

makefile

@@ -49,7 +49,7 @@ libraylua.a: src/raylua.o
 	$(AR) rcu $@ $^
 
 raylua.dll: src/raylua.o
-	$(CC) -shared -fPIE -o $@ $^ $(LDFLAGS)
+	$(CC) -shared -fPIE -o $@ $^ $(LDFLAGS) -llua5.1
 
 raylua.so: src/raylua.o
 	$(CC) -shared -fPIE -o $@ $^ $(LDFLAGS)

src/raylib.lua

@@ -24,7 +24,7 @@ end
 local ffi = require "ffi"
 local C = ffi.C
 
-rl = {}
+local rl = {}
 setmetatable(rl, rl)
 
 -- structs definition
@@ -894,3 +894,5 @@ end
 rl.__newindex = function ()
   error "rl table is readonly"
 end
+
+_G.rl = rl

src/raylua.c

@@ -39,7 +39,8 @@
 
 extern const char *raylua_boot_str;
 
-void raylua_boot(lua_State *L, lua_CFunction loadfile, lua_CFunction listfiles, bool repl)
+void raylua_boot(lua_State *L, lua_CFunction loadfile, lua_CFunction listfiles,
+  bool repl)
 {
   lua_newtable(L);
 
@@ -72,5 +73,8 @@ void raylua_boot(lua_State *L, lua_CFunction loadfile, lua_CFunction listfiles,
 int luaopen_raylua(lua_State *L)
 {
   raylua_boot(L, NULL, NULL, false);
-  return 0;
+
+  lua_getglobal(L, "rl");
+  lua_getglobal(L, "raylua");
+  return 2;
 }

src/raylua.h

@@ -20,7 +20,8 @@
 #include <stdbool.h>
 #include <lua.h>
 
-void raylua_boot(lua_State *L, lua_CFunction loadfile, lua_CFunction listfiles, bool repl);
+void raylua_boot(lua_State *L, lua_CFunction loadfile, lua_CFunction listfiles,
+  bool repl);
 
 /* raylua_boot alias to allow direct loading */
 int luaopen_raylua(lua_State *L);

src/raylua.lua

@@ -73,7 +73,7 @@ if raylua.loadfile then
   end
 end
 
-if arg[1] then
+if arg and arg[1] then
   dofile(arg[1])
   return
 end