Add butterflies mod

mods/butterflies/README.txt

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+Minetest Game mod: Butterflies
+==============================
+Adds butterflies to the world on mapgen, which can be caught in a net if the
+fireflies mod is also enabled.
+
+Authors of source code
+----------------------
+Shara RedCat (MIT)
+
+Authors of media (textures)
+---------------------------
+Shara RedCat (CC BY-SA 3.0):
+  butterflies_butterfly_*.png
+  butterflies_butterfly_*_animated.png

mods/butterflies/depends.txt

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+default
+flowers

mods/butterflies/init.lua

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+-- register butterflies
+local butter_list = {
+	{"white", "White"},
+	{"red", "Red"},
+	{"violet", "Violet"}
+}
+
+for i in ipairs (butter_list) do
+	local name = butter_list[i][1]
+	local desc = butter_list[i][2]
+
+	minetest.register_node("butterflies:butterfly_"..name, {
+		description = desc.." Butterfly",
+		drawtype = "plantlike",
+		tiles = {{
+			name = "butterflies_butterfly_"..name.."_animated.png",
+			animation = {
+				type = "vertical_frames",
+				aspect_w = 16,
+				aspect_h = 16,
+				length = 3
+			},
+		}},
+		inventory_image = "butterflies_butterfly_"..name..".png",
+		wield_image =  "butterflies_butterfly_"..name..".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},
+		},
+		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 = "butterflies:butterfly_"..name})
+				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 = "butterflies:hidden_butterfly_"..name})
+			end
+			minetest.get_node_timer(pos):start(30)
+		end
+	})
+
+	minetest.register_node("butterflies:hidden_butterfly_"..name, {
+		description = "Hidden "..desc.." Butterfly",
+		drawtype = "airlike",
+		inventory_image = "insects_butterfly_"..name..".png",
+		wield_image =  "insects_butterfly_"..name..".png",
+		paramtype = "light",
+		sunlight_propagates = true,
+		walkable = false,
+		pointable = false,
+		diggable = false,
+		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 = "butterflies:hidden_butterfly_"..name})
+				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 = "butterflies:butterfly_"..name})
+			end
+			minetest.get_node_timer(pos):start(30)
+		end
+	})
+end
+
+-- register decoration
+minetest.register_decoration({
+	name = "butterflies:butterfly",
+	deco_type = "simple",
+	place_on = {"default:dirt_with_grass"},
+	place_offset_y = 2,
+	sidelen = 80,
+	fill_ratio = 0.005,
+	biomes = {"grassland", "deciduous_forest", "floatland_grassland"},
+	y_max = 31000,
+	y_min = 1,
+	decoration = {
+		"butterflies:butterfly_white",
+		"butterflies:butterfly_red",
+		"butterflies:butterfly_violet"
+	},
+	spawn_by = "group:flower",
+	num_spawn_by = 1
+})
+
+-- get decoration ID
+local butterflies = minetest.get_decoration_id("butterflies:butterfly")
+minetest.set_gen_notify({decoration = true}, {butterflies})
+
+-- 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#"..butterflies] or {}) do
+		local deco_pos = {x = pos.x, y = pos.y + 3, z = pos.z}
+		table.insert(poslist, deco_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)

mods/butterflies/license.txt

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+License of source code
+----------------------
+
+The MIT License (MIT)
+Copyright (c) 2018 Shara RedCat
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+For more details:
+https://opensource.org/licenses/MIT
+
+Licenses of media (textures)
+----------------------------
+
+Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
+Copyright (C) 2018 Shara RedCat
+
+You are free to:
+Share — copy and redistribute the material in any medium or format.
+Adapt — remix, transform, and build upon the material for any purpose, even commercially.
+The licensor cannot revoke these freedoms as long as you follow the license terms.
+
+Under the following terms:
+
+Attribution — You must give appropriate credit, provide a link to the license, and
+indicate if changes were made. You may do so in any reasonable manner, but not in any way
+that suggests the licensor endorses you or your use.
+
+ShareAlike — If you remix, transform, or build upon the material, you must distribute
+your contributions under the same license as the original.
+
+No additional restrictions — You may not apply legal terms or technological measures that
+legally restrict others from doing anything the license permits.
+
+Notices:
+
+You do not have to comply with the license for elements of the material in the public
+domain or where your use is permitted by an applicable exception or limitation.
+No warranties are given. The license may not give you all of the permissions necessary
+for your intended use. For example, other rights such as publicity, privacy, or moral
+rights may limit how you use the material.
+
+For more details:
+http://creativecommons.org/licenses/by-sa/3.0/