write something there

mods/minetest_game/binoculars/init.lua

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+-- binoculars/init.lua
+
+-- Mod global namespace
+
+binoculars = {}
+
+-- Load support for MT game translation.
+local S = minetest.get_translator("binoculars")
+
+
+-- Update player property
+-- Global to allow overriding
+
+function binoculars.update_player_property(player)
+	local new_zoom_fov = 0
+
+	if player:get_inventory():contains_item(
+			"main", "binoculars:binoculars") then
+		new_zoom_fov = 10
+	elseif minetest.is_creative_enabled(player:get_player_name()) then
+		new_zoom_fov = 15
+	end
+
+	-- Only set property if necessary to avoid player mesh reload
+	if player:get_properties().zoom_fov ~= new_zoom_fov then
+		player:set_properties({zoom_fov = new_zoom_fov})
+	end
+end
+
+
+-- Set player property 'on joinplayer'
+
+minetest.register_on_joinplayer(function(player)
+	binoculars.update_player_property(player)
+end)
+
+
+-- Cyclic update of player property
+
+local function cyclic_update()
+	for _, player in ipairs(minetest.get_connected_players()) do
+		binoculars.update_player_property(player)
+	end
+	minetest.after(4.7, cyclic_update)
+end
+
+minetest.after(4.7, cyclic_update)
+
+
+-- Binoculars item
+
+minetest.register_craftitem("binoculars:binoculars", {
+	description = S("Binoculars") .. "\n" .. S("Use with 'Zoom' key"),
+	inventory_image = "binoculars_binoculars.png",
+	stack_max = 1,
+	groups = {tool = 1},
+
+	on_use = function(itemstack, user, pointed_thing)
+		binoculars.update_player_property(user)
+	end,
+})
+
+
+-- Crafting
+
+minetest.register_craft({
+	output = "binoculars:binoculars",
+	recipe = {
+		{"default:obsidian_glass", "", "default:obsidian_glass"},
+		{"default:bronze_ingot", "default:bronze_ingot", "default:bronze_ingot"},
+		{"default:obsidian_glass", "", "default:obsidian_glass"},
+	}
+})