spawners/spawners_mobs/spawners_mobs.lua

--[[
    Let the player craft Mob Spawners. Mobs are spawning randomly in a short intervals, giving the option of creating mob farms and grinders.
    Copyright (C) 2016 - 2023 SaKeL <juraj.vajda@gmail.com>

    This library is free software; you can redistribute it and/or
    modify it pos the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to juraj.vajda@gmail.com
--]]

--
-- CREATE ALL SPAWNERS NODES
--
function spawners_mobs.create(mob_table, idx)
    local mob_name = mob_table.name
    local mod_prefix = mob_table.mod_prefix
    local size = mob_table.dummy_size
    local mesh = mob_table.dummy_mesh
    local texture = mob_table.dummy_texture

    --
    -- DUMMY INSIDE THE SPAWNER
    --
    minetest.register_entity('spawners_mobs:dummy_' .. mod_prefix .. '_' .. mob_name, {
        hp_max = 1,
        visual = 'mesh',
        visual_size = size,
        collisionbox = { 0, 0, 0, 0, 0, 0 },
        mesh = mesh,
        textures = texture,
        physical = false,
        makes_footstep_sound = false,
        automatic_rotate = math.pi * -3,
        static_save = false,

        on_activate = function(self, staticdata, dtime_s)
            self.object:set_velocity({ x = 0, y = 0, z = 0 })
            self.object:set_acceleration({ x = 0, y = 0, z = 0 })
            self.object:set_armor_groups({ immortal = 1 })
        end
    })

    --
    -- DEFAULT SPAWNER
    --
    minetest.register_node('spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner', {
        description = mod_prefix .. '_' .. mob_name .. ' spawner',
        paramtype = 'light',
        paramtype2 = 'glasslikeliquidlevel',
        drawtype = 'glasslike_framed_optional',
        walkable = true,
        sounds = default.node_sound_metal_defaults(),
        sunlight_propagates = true,
        tiles = { 'spawners_mobs_spawner_16.png' },
        is_ground_content = false,
        groups = { cracky = 1, level = 2 },
        stack_max = 1,
        light_source = 6,

        on_timer = spawners_mobs.on_timer,

        on_construct = function(pos)
            -- set meta
            local meta = minetest.get_meta(pos)
            meta:set_int('idx', idx)
            meta:set_int('tick', 0)
            meta:set_int('tick_short', 0)

            spawners_mobs.set_status(pos, 'active')
            spawners_mobs.tick_short(pos)
        end,

        after_place_node = function(pos, placer, itemstack, pointed_thing)
            local meta = minetest.get_meta(pos)
            meta:set_string('owner', placer:get_player_name())

            meta:set_string('infotext', mob_name .. ' spawner\nowner: ' .. placer:get_player_name() .. '\nspawner is active')
        end,

        on_destruct = function(pos)
            -- delete particles and remove dummy
            spawners_mobs.set_status(pos, 'waiting')
        end
    })

    table.insert(spawners_mobs.registered_spawners_names, 'spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner')

    --
    -- WAITING SPAWNER
    --
    minetest.register_node('spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner_waiting', {
        description = mod_prefix .. '_' .. mob_name .. ' spawner waiting',
        paramtype = 'light',
        paramtype2 = 'glasslikeliquidlevel',
        drawtype = 'glasslike_framed_optional',
        sounds = default.node_sound_metal_defaults(),
        walkable = true,
        sunlight_propagates = true,
        tiles = {
            {
                name = 'spawners_mobs_spawner_waiting_animated_16.png',
                animation = {
                    type = 'vertical_frames',
                    aspect_w = 16,
                    aspect_h = 16,
                    length = 2.0
                },
            }
        },
        is_ground_content = false,
        groups = { cracky = 1, level = 2, not_in_creative_inventory = 1 },
        light_source = 4,
        drop = 'spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner',

        on_timer = spawners_mobs.on_timer
    })

    --
    -- RUSTY SPAWNER
    --
    minetest.register_node('spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner_rusty', {
        description = mod_prefix .. '_' .. mob_name .. ' spawner rusty',
        paramtype = 'light',
        paramtype2 = 'glasslikeliquidlevel',
        drawtype = 'glasslike_framed_optional',
        sounds = default.node_sound_metal_defaults(),
        walkable = true,
        sunlight_propagates = true,
        tiles = { 'spawners_mobs_spawner_rusty.png' },
        is_ground_content = false,
        groups = { cracky = 1, level = 2, not_in_creative_inventory = 1 },
        drop = 'spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner'
    })

    --
    -- replacement LBM for pre-nodetimer spawners
    --
    minetest.register_lbm({
        name = 'spawners_mobs:start_nodetimer_' .. mod_prefix .. '_' .. mob_name .. '_spawner',
        nodenames = 'spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner',
        action = function(pos)
            spawners_mobs.tick_short(pos)
        end,
    })

    --
    -- COMPATIBILITY
    --
    minetest.register_alias('spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner_active', 'spawners_mobs:' .. mod_prefix .. '_' .. mob_name .. '_spawner')
end

--
-- INIT 'CREATE' FOR ALL SPAWNERS
--
for i, mob_table in ipairs(spawners_mobs.mob_tables) do
    spawners_mobs.create(mob_table, i)
end