nc_contraptions/init.lua

local minetest, vector, nodecore, include
    = minetest, vector, nodecore, include

local search      = include("search")
local contraption = include("contraption")

local mod_name    = minetest.get_current_modname()

local i_stick = "nc_tree:stick"
local i_staff = "nc_tree:staff"
local i_frame = "nc_woodwork:frame"
local i_form  = "nc_woodwork:form"
local i_plank = "nc_woodwork:plank"

local t_plank = "nc_woodwork_plank.png"
local t_frame_log = "(nc_tree_tree_side.png^[mask:nc_api_storebox_frame.png^[opacity:127)"

-- Load and save contraptions.
contraption.on_startup()
minetest.register_on_shutdown(contraption.on_shutdown)

-- `on_global_step` updates and moves around active contraptions.
minetest.register_globalstep(contraption.on_global_step)

-- Punching a contraption applies some force to it.
-- Multiple players can push a contraption more effectively.
minetest.register_on_punchnode(function(pos, node, puncher, pointed_thing)
    local contrap = contraption.find(pos)
    if not contrap then return end

    if (not pointed_thing.above) or (not pointed_thing.under) then return end
    local dir = vector.subtract(pointed_thing.under, pointed_thing.above)
    contrap:push(puncher, dir)
end)

-- TODO: Provide a method to register additional types of contraption blocks.
minetest.register_node(mod_name .. ":contraption_wood", {
    description = "Wooden Contraption",
    tiles = { t_plank .. "^" .. t_frame_log },
    sounds = nodecore.sounds("nc_tree_woody"),
    groups = {
        choppy = 1,
        flammable = 2,
        fire_fuel = 5,
    },
    on_dig = function(pos, node, digger)
        local contrap = contraption.find(pos)
        if contrap then contrap:destroy()
        else minetest.node_dig(pos, node, digger) end
    end,
    drop_in_place = "nc_woodwork:plank",
})

-- TODO: Take priority over or hook into frame-to-form recipe to do our thing instead.
nodecore.register_craft({
    label = "assemble wooden contraption",
    action = "pummel",
    priority = 1,
    toolgroups = { thumpy = 3 },
    indexkeys = { i_frame },
    nodes = { { match = i_frame } },
    check = function(pos, data)
        data.found_square = search.find_rectangle(pos, i_frame)
        return not not data.found_square
    end,
    after = function(pos, data)
        contraption.create(data.found_square)
    end,
})