minetest_game/mods/fireflies/init.lua

-- firefly
minetest.register_node("fireflies:firefly", {
	description = "Firefly",
	drawtype = "plantlike",
	tiles = {{
		name = "fireflies_firefly_animated.png",
		animation = {
			type = "vertical_frames",
			aspect_w = 16,
			aspect_h = 16,
			length = 1.5
		},
	}},
	inventory_image = "fireflies_firefly.png",
	wield_image =  "fireflies_firefly.png",
	waving = 1,
	paramtype = "light",
	sunlight_propagates = true,
	buildable_to = true,
	walkable = false,
	groups = {catchable = 1},
	selection_box = {
		type = "fixed",
		fixed = {-0.1, -0.1, -0.1, 0.1, 0.1, 0.1},
	},
	light_source = 6,
	floodable = true,
	on_place = function(itemstack, placer, pointed_thing)
		local player_name = placer:get_player_name()
		local pos = pointed_thing.above

		if not minetest.is_protected(pos, player_name) and
				not minetest.is_protected(pointed_thing.under, player_name) and
				minetest.get_node(pos).name == "air" then
			minetest.set_node(pos, {name = "fireflies:firefly"})
			minetest.get_node_timer(pos):start(1)
			itemstack:take_item()
		end
		return itemstack
	end,
	on_timer = function(pos, elapsed)
		if minetest.get_node_light(pos) > 11 then
			minetest.set_node(pos, {name = "fireflies:hidden_firefly"})
		end
		minetest.get_node_timer(pos):start(30)
	end
})

minetest.register_node("fireflies:hidden_firefly", {
	description = "Hidden Firefly",
	drawtype = "airlike",
	inventory_image = "fireflies_firefly.png",
	wield_image =  "fireflies_firefly.png",
	paramtype = "light",
	sunlight_propagates = true,
	walkable = false,
	pointable = false,
	diggable = false,
	buildable_to = true,
	drop = "",
	groups = {not_in_creative_inventory = 1},
	floodable = true,
	on_place = function(itemstack, placer, pointed_thing)
		local player_name = placer:get_player_name()
		local pos = pointed_thing.above

		if not minetest.is_protected(pos, player_name) and
				not minetest.is_protected(pointed_thing.under, player_name) and
				minetest.get_node(pos).name == "air" then
			minetest.set_node(pos, {name = "fireflies:hidden_firefly"})
			minetest.get_node_timer(pos):start(1)
			itemstack:take_item()
		end
		return itemstack
	end,
	on_timer = function(pos, elapsed)
		if minetest.get_node_light(pos) <= 11 then
			minetest.set_node(pos, {name = "fireflies:firefly"})
		end
		minetest.get_node_timer(pos):start(30)
	end
})


-- bug net
minetest.register_tool("fireflies:bug_net", {
	description = "Bug Net",
	inventory_image = "fireflies_bugnet.png",
	on_use = function(itemstack, player, pointed_thing)
		if not pointed_thing or pointed_thing.type ~= "node" or
				minetest.is_protected(pointed_thing.under, player:get_player_name()) then
			return
		end
		local node_name = minetest.get_node(pointed_thing.under).name
		local inv = player:get_inventory()
		if minetest.get_item_group(node_name, "catchable") == 1 then
			minetest.set_node(pointed_thing.under, {name = "air"})
			local stack = ItemStack(node_name.." 1")
			local leftover = inv:add_item("main", stack)
			if leftover:get_count() > 0 then
				minetest.add_item(pointed_thing.under, node_name.." 1")
			end
		end
		if not (creative and creative.is_enabled_for(player:get_player_name())) then
			itemstack:add_wear(256)
			return itemstack
		end
	end
})

minetest.register_craft( {
	output = "fireflies:bug_net",
	recipe = {
		{"farming:string", "farming:string", ""},
		{"farming:string", "farming:string", ""},
		{"default:stick", "", ""}
	}
})


-- firefly in a bottle
minetest.register_node("fireflies:firefly_bottle", {
	description = "Firefly in a Bottle",
	inventory_image = "fireflies_bottle.png",
	wield_image = "fireflies_bottle.png",
	tiles = {{
		name = "fireflies_bottle_animated.png",
		animation = {
			type = "vertical_frames",
			aspect_w = 16,
			aspect_h = 16,
			length = 1.5
		},
	}},
	drawtype = "plantlike",
	paramtype = "light",
	sunlight_propagates = true,
	light_source = 9,
	walkable = false,
	groups = {dig_immediate = 3, attached_node = 1},
	selection_box = {
		type = "fixed",
		fixed = {-0.25, -0.5, -0.25, 0.25, 0.3, 0.25}
	},
	sounds = default.node_sound_glass_defaults(),
	on_rightclick = function(pos, node, player, itemstack, pointed_thing)
		local lower_pos = {x = pos.x, y = pos.y + 1, z = pos.z}
		if minetest.is_protected(pos, player:get_player_name()) or
				minetest.get_node(lower_pos).name ~= "air" then
			return
		end

		local upper_pos = {x = pos.x, y = pos.y + 2, z = pos.z}
		local firefly_pos

		if not minetest.is_protected(upper_pos, player:get_player_name()) and
				minetest.get_node(upper_pos).name == "air" then
			firefly_pos = upper_pos
		elseif not minetest.is_protected(lower_pos, player:get_player_name()) then
			firefly_pos = lower_pos
		end

		if firefly_pos then
			minetest.set_node(pos, {name = "vessels:glass_bottle"})
			minetest.set_node(firefly_pos, {name = "fireflies:firefly"})
			minetest.get_node_timer(firefly_pos):start(1)
		end
	end
})

minetest.register_craft( {
	output = "fireflies:firefly_bottle",
	recipe = {
		{"", "", ""},
		{"", "fireflies:firefly", ""},
		{"", "vessels:glass_bottle", ""}
	}
})


-- register fireflies as decorations

if minetest.get_mapgen_setting("mg_name") == "v6" then

	minetest.register_decoration({
		name = "fireflies:firefly_low",
		deco_type = "simple",
		place_on = "default:dirt_with_grass",
		place_offset_y = 2,
		sidelen = 80,
		fill_ratio = 0.0002,
		y_max = 31000,
		y_min = 1,
		decoration = "fireflies:hidden_firefly",
	})

	minetest.register_decoration({
		name = "fireflies:firefly_high",
		deco_type = "simple",
		place_on = "default:dirt_with_grass",
		place_offset_y = 3,
		sidelen = 80,
		fill_ratio = 0.0002,
		y_max = 31000,
		y_min = 1,
		decoration = "fireflies:hidden_firefly",
	})

else

	minetest.register_decoration({
		name = "fireflies:firefly_low",
		deco_type = "simple",
		place_on = {
			"default:dirt_with_grass",
			"default:dirt_with_coniferous_litter",
			"default:dirt_with_rainforest_litter",
			"default:dirt"
		},
		place_offset_y = 2,
		sidelen = 80,
		fill_ratio = 0.0005,
		biomes = {
			"deciduous_forest",
			"coniferous_forest",
			"rainforest",
			"rainforest_swamp"
		},
		y_max = 31000,
		y_min = -1,
		decoration = "fireflies:hidden_firefly",
	})

	minetest.register_decoration({
		name = "fireflies:firefly_high",
		deco_type = "simple",
		place_on = {
			"default:dirt_with_grass",
			"default:dirt_with_coniferous_litter",
			"default:dirt_with_rainforest_litter",
			"default:dirt"
		},
		place_offset_y = 3,
		sidelen = 80,
		fill_ratio = 0.0005,
		biomes = {
			"deciduous_forest",
			"coniferous_forest",
			"rainforest",
			"rainforest_swamp"
		},
		y_max = 31000,
		y_min = -1,
		decoration = "fireflies:hidden_firefly",
	})

end


-- get decoration IDs
local firefly_low = minetest.get_decoration_id("fireflies:firefly_low")
local firefly_high = minetest.get_decoration_id("fireflies:firefly_high")

minetest.set_gen_notify({decoration = true}, {firefly_low, firefly_high})

-- start nodetimers
minetest.register_on_generated(function(minp, maxp, blockseed)
	local gennotify = minetest.get_mapgen_object("gennotify")
	local poslist = {}

	for _, pos in ipairs(gennotify["decoration#"..firefly_low] or {}) do
		local firefly_low_pos = {x = pos.x, y = pos.y + 3, z = pos.z}
		table.insert(poslist, firefly_low_pos)
	end
	for _, pos in ipairs(gennotify["decoration#"..firefly_high] or {}) do
		local firefly_high_pos = {x = pos.x, y = pos.y + 4, z = pos.z}
		table.insert(poslist, firefly_high_pos)
	end

	if #poslist ~= 0 then
		for i = 1, #poslist do
			local pos = poslist[i]
			minetest.get_node_timer(pos):start(1)
		end
	end
end)