initial draft

.luacheckrc

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+
+globals = {
+	"minetest"
+}
+
+read_globals = {
+	-- Stdlib
+	string = {fields = {"split"}},
+	table = {fields = {"copy", "getn"}},
+
+	-- Minetest
+	"vector", "ItemStack",
+	"dump", "VoxelArea"
+}

.travis.yml

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+jobs:
+ include:
+  - stage: luacheck
+    language: generic
+    sudo: false
+    addons:
+     apt:
+      packages:
+       - luarocks
+    before_install:
+     - luarocks install --local luacheck
+    script:
+     - $HOME/.luarocks/bin/luacheck --no-color .

init.lua

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+
+local update_formspec = function(meta)
+	local pos = meta:get_string("pos")
+
+	meta:set_string("infotext", "Add item block: pos=" .. pos)
+
+	meta:set_string("formspec", "size[8,7;]" ..
+		"field[0.2,0.5;4,1;amount;Amount;${amount}]" ..
+		"field[4.2,0.5;4,1;amount;Amount;${amount}]" ..
+
+		"button_exit[6.1,1.5;2,1;save;Save]" ..
+		"list[context;main;0.1,1.5;1,1;]" ..
+
+		"list[current_player;main;0,3;8,4;]" ..
+		"listring[]" ..
+		"")
+end
+
+minetest.register_node("particlefountain:particlefountain", {
+	description = "Particlefountain",
+	tiles = {
+		"default_gold_block.png^default_mese_crystal.png"
+	},
+	groups = {cracky=3,oddly_breakable_by_hand=3},
+
+	on_construct = function(pos)
+    local meta = minetest.get_meta(pos)
+		meta:set_int("amount", 4)
+		meta:set_int("glow", 9)
+
+		local inv = meta:get_inventory()
+		inv:set_size("main", 1)
+
+    update_formspec(meta, pos)
+		minetest.get_node_timer(pos):start(2)
+  end,
+
+  on_receive_fields = function(pos, _, fields, sender)
+		if not sender or minetest.is_protected(pos, sender:get_player_name()) then
+			-- not allowed
+			return
+		end
+
+		local meta = minetest.get_meta(pos);
+
+		if fields.save then
+			meta:set_int("amount", tonumber(fields.amount) or 4)
+			meta:set_int("glow", tonumber(fields.glow) or 9)
+		end
+
+		update_formspec(meta)
+  end,
+
+	allow_metadata_inventory_put = function(pos, _, _, stack, player)
+		if minetest.is_protected(pos, player:get_player_name()) then
+			return 0
+		end
+
+		return stack:get_count()
+	end,
+
+	allow_metadata_inventory_take = function(pos, _, _, stack, player)
+		if minetest.is_protected(pos, player:get_player_name()) then
+			return 0
+		end
+
+		return stack:get_count()
+	end,
+
+	on_timer = function(pos)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		local stack = inv:get_stack("main", 1)
+		local node_name = stack:get_name()
+		if node_name == "ignore" or node_name == "" then
+			return true
+		end
+
+		local def = minetest.registered_items[node_name]
+		if not def then
+			return true
+		end
+
+		local texture = "default_mese_crystal.png"
+
+		if def.inventory_image then
+			texture = def.inventory_image
+
+		elseif def.tiles then
+			if type(def.tiles) == "string" then
+				texture = def.tiles
+
+			elseif type(def.tiles) == "table" then
+				texture = def.tiles[1]
+
+			end
+		end
+
+		minetest.add_particlespawner({
+			amount = meta:get_int("amount"),
+			time = 2,
+			minpos = vector.add(pos, {x=-0.2, y=0, z=-0.2}),
+			maxpos = vector.add(pos, {x=0.2, y=0, z=0.2}),
+			minvel = {x=0, y=1, z=0},
+			maxvel = {x=0, y=2, z=0},
+			minacc = {x=0, y=0, z=0},
+			maxacc = {x=0, y=0, z=0},
+			minexptime = 1,
+			maxexptime = 2,
+			minsize = 1,
+			maxsize = 1.7,
+			collisiondetection = false,
+			collision_removal = false,
+			object_collision = false,
+			vertical = false,
+			texture = texture,
+      glow = meta:get_int("glow")
+		})
+
+		return true
+	end
+})

license.txt

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+License of source code
+----------------------
+
+The MIT License (MIT)
+Copyright (C) 2018-2019 Thomas Rudin
+
+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) 2019 Thomas Rudin
+
+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.

mod.conf

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+name = particlefountain
+description = decorative and configurable particle spawner

readme.md

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+
+particlefountain
+-----------------
+
+A mod for [minetest](http://www.minetest.net)
+
+[![Build Status](https://travis-ci.org/damocles-minetest/particlefountain.svg?branch=master)](https://travis-ci.org/damocles-minetest/particlefountain)
+
+# Overview
+
+decorative and configurable particle spawner
+
+# License
+
+## Code
+
+* MIT