[BREAKING] Add compat with Lua >=5.2

The luaocc library is no longer put into the global namespace

.gitlab-ci.yml

@@ -2,7 +2,10 @@ test:
     stage: test
     image: archlinux
     script:
-        - pacman -Syu --noconfirm luarocks lua51 gcc opencc
-        - luarocks install --lua-version 5.1 busted
-        - luarocks make --lua-version 5.1
-        - busted busted_unittest.lua
+        - pacman -Syu --noconfirm luarocks gcc opencc lua51 lua52 lua53 lua
+        - for i in 5.1 5.2 5.3 5.4; do
+        - luarocks install --lua-version $i busted
+        - luarocks make --lua-version $i
+        - busted busted_unittest.lua
+        - luarocks remove --lua-version $i busted
+        - done

luaocc-0.1-2.rockspec

@@ -10,7 +10,7 @@ description = {
    license = "Apache"
 }
 dependencies = {
-   "lua ~> 5.1"
+   "lua >= 5.1 <= 5.4"
 }
 external_dependencies = {
    OPENCC = {

main.c

@@ -35,21 +35,26 @@ static int L_close(lua_State *L) {
 	return 0;
 }
 
-static const struct luaL_reg occlib[] = {
+static const struct luaL_Reg occlib[] = {
 	{"open", L_open},
 	{"convert", L_convert},
 	{NULL, NULL}
 };
 
-static const struct luaL_reg occmt[] = {
+static const struct luaL_Reg occmt[] = {
 	{"__call", L_convert},
 	{"__gc", L_close},
 	{NULL, NULL}
 };
 
+#if (LUA_VERSION_NUM >= 502)
+	#define luaL_register(L, _, l) luaL_setfuncs(L, l, 0)
+#endif
+
 int luaopen_luaocc(lua_State *L) {
 	luaL_newmetatable(L, "luaocc");
 	luaL_register(L, NULL, occmt);
-	luaL_register(L, "luaocc", occlib);
+	lua_newtable(L);
+	luaL_register(L, NULL, occlib);
 	return 1;
-}
+}