Add a map imitation

The map item just enables the minimap. It's pretty overpowered at the moment.

mods/ITEMS/mcl_maps/init.lua

@@ -0,0 +1,81 @@
+-- Turn empty map into filled map by rightclick
+local make_filled_map = function(itemstack, placer, pointed_thing)
+	local new_map = ItemStack("mcl_maps:filled_map")
+	itemstack:take_item()
+	if itemstack:is_empty() then
+		return new_map
+	else
+		local inv = placer:get_inventory()
+		if inv:room_for_item("main", new_map) then
+			inv:add_item("main", new_map)
+		else
+			minetest.add_item(placer:getpos(), new_map)
+		end
+		return itemstack
+	end
+end
+
+minetest.register_craftitem("mcl_maps:empty_map", {
+	description = "Empty Map",
+	inventory_image = "mcl_maps_map_empty.png",
+	groups = { not_in_creative_inventory = 1 },
+	on_place = make_filled_map,
+	on_secondary_use = make_filled_map,
+	stack_max = 64,
+})
+
+-- Enables minimap if carried in hotbar.
+-- If this item is NOT in the hotbar, the minimap is unavailable
+-- Note: This is not at all like Minecraft right now. Minetest's minimap is pretty overpowered, it
+-- has a very greatly zoomed-out version and even a radar mode
+minetest.register_craftitem("mcl_maps:filled_map", {
+	description = "Map",
+	inventory_image = "mcl_maps_map_filled.png^(mcl_maps_map_filled_markings.png^[colorize:#000000)",
+	stack_max = 1,
+})
+
+minetest.register_craft({
+	output = "mcl_maps:filled_map",
+	recipe = {
+		{ "mcl_core:paper", "mcl_core:paper", "mcl_core:paper" },
+		{ "mcl_core:paper", "group:compass", "mcl_core:paper" },
+		{ "mcl_core:paper", "mcl_core:paper", "mcl_core:paper" },
+	}
+})
+
+local function has_item_in_hotbar(player, item)
+	-- Requirement: player carries the tool in the hotbar
+	local inv = player:get_inventory()
+	local hotbar = player:hud_get_hotbar_itemcount()
+	for i=1, hotbar do
+		if inv:get_stack("main", i):get_name() == item then
+			return true
+		end
+	end
+	return false
+end
+
+-- Checks if player is still allowed to display the minimap
+local function update_minimap(player)
+	if has_item_in_hotbar(player, "mcl_maps:filled_map") then
+		player:hud_set_flags({minimap = true})
+	else
+		player:hud_set_flags({minimap = false})
+	end
+end
+
+minetest.register_on_joinplayer(function(player)
+	update_minimap(player)
+end)
+
+local updatetimer = 0
+minetest.register_globalstep(function(dtime)
+	updatetimer = updatetimer + dtime
+	if updatetimer > 0.1 then
+		local players = minetest.get_connected_players()
+		for i=1, #players do
+			update_minimap(players[i])
+		end
+		updatetimer = updatetimer - dtime
+	end
+end)

mods/ITEMS/mcl_maps/mod.conf

@@ -0,0 +1 @@
+name = mcl_maps

mods/PLAYER/mcl_player/init.lua

@@ -148,9 +148,8 @@ minetest.register_on_joinplayer(function(player)
 	-- Minecraft has no sneak glitch
 	-- sneak is also disabled because it is buggy in Minetest (can be used to negate fall damage)
 	player:set_physics_override({sneak_glitch=false})
-	-- Minecraft also offers no minimap for free
-	player:hud_set_flags({minimap=false})
 	player:set_local_animation({x=0, y=79}, {x=168, y=187}, {x=189, y=198}, {x=200, y=219}, 30)
+	-- Note: Minimap is now handled in mcl_maps
 end)
 
 minetest.register_on_leaveplayer(function(player)