add howlight command

chatcommands.lua

@@ -0,0 +1,17 @@
+minetest.register_chatcommand("howlight", {
+	description = "Show the light level of the ground below you",
+	func = function(name)
+		local player = minetest.get_player_by_name(name)
+		if player then
+			local player_pos = vector.round(player:get_pos())
+			-- local pos = vector.new(player_pos.x, player_pos.y - 1 , player_pos.z)
+			local pos = player_pos
+			-- underground, light is always zero, so z-1 doesn't work.
+			local pos_string = minetest.pos_to_string(pos)
+			minetest.chat_send_player(name, "Light level at " .. pos_string .. " is " .. minetest.get_node_light(pos) .. ".")
+			return true
+		else
+			return false, "You are not connected to minetestserver."
+		end
+	end
+})

init.lua

@@ -20,6 +20,7 @@ local nodelock = {}
 
 local modpath = minetest.get_modpath("metatools")
 dofile(modpath .. "/assertions.lua")
+dofile(modpath .. "/chatcommands.lua")
 
 minetest.register_craftitem("metatools:stick",{
 	description = "Meta stick",