techpack/tubelib/blackhole.lua

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--[[
Tube Library
============
Copyright (C) 2017-2019 Joachim Stolberg
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LGPLv2.1+
See LICENSE.txt for more information
blackhole.lua:
Simple node which lets all items disappear.
The blackhole supports the following message:
- topic = "status", payload = nil,
response is the number of disappeared items (0..n)
]]--
-- +--------+
-- / /|
-- +--------+ |
-- IN (L) -->| BLACK | |
-- | HOLE | +
-- | |/
-- +--------+
minetest.register_node("tubelib:blackhole", {
description = "Tubelib Black Hole",
tiles = {
-- up, down, right, left, back, front
'tubelib_front.png',
'tubelib_front.png',
'tubelib_black_hole.png',
'tubelib_black_hole_inp.png',
"tubelib_black_hole.png",
"tubelib_black_hole.png",
},
after_place_node = function(pos, placer)
local meta = minetest.get_meta(pos)
local number = tubelib.add_node(pos, "tubelib:blackhole") -- <<=== tubelib
meta:set_string("number", number)
meta:set_int("disappeared", 0)
meta:set_string("infotext","0 items disappeared")
end,
after_dig_node = function(pos)
tubelib.remove_node(pos) -- <<=== tubelib
end,
on_rotate = screwdriver.disallow,
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paramtype = "light",
sunlight_propagates = true,
paramtype2 = "facedir",
groups = {choppy=2, cracky=2, crumbly=2},
is_ground_content = false,
sounds = default.node_sound_wood_defaults(),
})
minetest.register_craft({
output = "tubelib:blackhole 2",
recipe = {
{"group:wood", "", "group:wood"},
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{"tubelib:tubeS", "default:coal_lump", "default:coal_lump"},
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{"group:wood", "", "group:wood"},
},
})
--------------------------------------------------------------- tubelib
tubelib.register_node("tubelib:blackhole", {}, {
on_pull_item = nil, -- not needed
on_unpull_item = nil, -- not needed
on_push_item = function(pos, side, item)
if side == "L" then
local meta = minetest.get_meta(pos)
local disappeared = meta:get_int("disappeared") + 1
meta:set_int("disappeared", disappeared)
meta:set_string("infotext", disappeared.." items disappeared")
return true
end
return false
end,
on_recv_message = function(pos, topic, payload)
local node = minetest.get_node(pos)
if topic == "state" then
local meta = minetest.get_meta(pos)
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return meta:get_int("disappeared")
else
return "not supported"
end
end,
})
--------------------------------------------------------------- tubelib