globalstep based formspec updating

mods/formspec_edit/init.lua

@@ -10,7 +10,8 @@ minetest.register_alias("mapgen_water_source", "air")
 --Variables
 local modpath = minetest.get_modpath("formspec_edit")
 local insecure_env = minetest.request_insecure_environment()
-local auto_update_time = 0.2 --seconds
+local update_time = 0.2 --seconds
+
 local error_formspec = [[
 formspec_version[4]
 size[8,2]
@@ -19,11 +20,17 @@ label[0.375,0.5;Error:formspec.spec is either ]
 label[0.375,1;non-existent,or empty]
 ]]
 
+--Crash if not singleplayer
+--TODO: hide the 'Host server' checkbox in main menu then possible
+if not minetest.is_singleplayer() then
+	error("[formspec_editor] This game doesn't work in multiplayer!")
+end
+
 --function declarations
 local update_formspec = nil
 local load_formspec = nil
-local auto_update = nil
 local turn_off_hud = nil
+local set_sky
 
 --Registrations
 
@@ -32,7 +39,6 @@ local turn_off_hud = nil
 -----------------------------------
 minetest.register_on_joinplayer(
 function(player_ref,_)
-    auto_update(player_ref:get_player_name())
 	turn_off_hud(player_ref)
 	set_sky(player_ref)
 end
@@ -51,14 +57,6 @@ end
 
 --function definitions
 
------------------------------------
---auto_update()
------------------------------------
-auto_update = function(player_name)
-    update_formspec(player_name)
-    minetest.after(auto_update_time,auto_update,player_name)
-end
-
 -----------------------------------
 --update_formspec()
 -----------------------------------
@@ -117,3 +115,15 @@ set_sky = function(player_ref)
 	player_ref:set_sky(sky)
 	player_ref:override_day_night_ratio(0)
 end
+
+local time = 0
+minetest.register_globalstep(function(dtime)
+	time = time + dtime
+	if time >= update_time then
+		local player = minetest.get_connected_players()[1]
+		if player then
+			update_formspec(player:get_player_name())
+		end
+		time = 0
+	end
+end)