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VoxeLibre/mods/CORE/mcl_util/init.lua

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mcl_util = {}
-- Updates all values in t using values from to*.
function table.update(t, ...)
for _, to in ipairs{...} do
for k,v in pairs(to) do
t[k] = v
end
end
return t
end
-- Updates nil values in t using values from to*.
function table.update_nil(t, ...)
for _, to in ipairs{...} do
for k,v in pairs(to) do
if t[k] == nil then
t[k] = v
end
end
end
return t
end
-- Based on minetest.rotate_and_place
--[[
Attempt to predict the desired orientation of the pillar-like node
defined by `itemstack`, and place it accordingly in one of 3 possible
orientations (X, Y or Z).
Stacks are handled normally if the `infinitestacks`
field is false or omitted (else, the itemstack is not changed).
* `invert_wall`: if `true`, place wall-orientation on the ground and ground-
orientation on wall
This function is a simplified version of minetest.rotate_and_place.
The Minetest function is seen as inappropriate because this includes mirror
images of possible orientations, causing problems with pillar shadings.
]]
function mcl_util.rotate_axis_and_place(itemstack, placer, pointed_thing, infinitestacks, invert_wall)
local unode = minetest.get_node_or_nil(pointed_thing.under)
if not unode then
return
end
local undef = minetest.registered_nodes[unode.name]
if undef and undef.on_rightclick then
undef.on_rightclick(pointed_thing.under, unode, placer,
itemstack, pointed_thing)
return
end
local fdir = minetest.dir_to_facedir(placer:get_look_dir())
local wield_name = itemstack:get_name()
local above = pointed_thing.above
local under = pointed_thing.under
local is_x = (above.x ~= under.x)
local is_y = (above.y ~= under.y)
local is_z = (above.z ~= under.z)
local anode = minetest.get_node_or_nil(above)
if not anode then
return
end
local pos = pointed_thing.above
local node = anode
if undef and undef.buildable_to then
pos = pointed_thing.under
node = unode
end
if minetest.is_protected(pos, placer:get_player_name()) then
minetest.record_protection_violation(pos, placer:get_player_name())
return
end
local ndef = minetest.registered_nodes[node.name]
if not ndef or not ndef.buildable_to then
return
end
local p2
if is_y then
if invert_wall then
if fdir == 3 or fdir == 1 then
p2 = 12
else
p2 = 6
end
end
elseif is_x then
if invert_wall then
p2 = 0
else
p2 = 12
end
elseif is_z then
if invert_wall then
p2 = 0
else
p2 = 6
end
end
minetest.set_node(pos, {name = wield_name, param2 = p2})
if not infinitestacks then
itemstack:take_item()
return itemstack
end
end
-- Wrapper of above function for use as `on_place` callback (Recommended).
-- Similar to minetest.rotate_node.
function mcl_util.rotate_axis(itemstack, placer, pointed_thing)
mcl_util.rotate_axis_and_place(itemstack, placer, pointed_thing,
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minetest.is_creative_enabled(placer:get_player_name()),
placer:get_player_control().sneak)
return itemstack
end
-- Returns position of the neighbor of a double chest node
-- or nil if node is invalid.
-- This function assumes that the large chest is actually intact
-- * pos: Position of the node to investigate
-- * param2: param2 of that node
-- * side: Which "half" the investigated node is. "left" or "right"
function mcl_util.get_double_container_neighbor_pos(pos, param2, side)
if side == "right" then
if param2 == 0 then
return {x=pos.x-1, y=pos.y, z=pos.z}
elseif param2 == 1 then
return {x=pos.x, y=pos.y, z=pos.z+1}
elseif param2 == 2 then
return {x=pos.x+1, y=pos.y, z=pos.z}
elseif param2 == 3 then
return {x=pos.x, y=pos.y, z=pos.z-1}
end
else
if param2 == 0 then
return {x=pos.x+1, y=pos.y, z=pos.z}
elseif param2 == 1 then
return {x=pos.x, y=pos.y, z=pos.z-1}
elseif param2 == 2 then
return {x=pos.x-1, y=pos.y, z=pos.z}
elseif param2 == 3 then
return {x=pos.x, y=pos.y, z=pos.z+1}
end
end
end
-- Iterates through all items in the given inventory and
-- returns the slot of the first item which matches a condition.
-- Returns nil if no item was found.
--- source_inventory: Inventory to take the item from
--- source_list: List name of the source inventory from which to take the item
--- destination_inventory: Put item into this inventory
--- destination_list: List name of the destination inventory to which to put the item into
--- condition: Function which takes an itemstack and returns true if it matches the desired item condition.
--- If set to nil, the slot of the first item stack will be taken unconditionally.
-- dst_inventory and dst_list can also be nil if condition is nil.
function mcl_util.get_eligible_transfer_item_slot(src_inventory, src_list, dst_inventory, dst_list, condition)
local size = src_inventory:get_size(src_list)
local stack
for i=1, size do
stack = src_inventory:get_stack(src_list, i)
if not stack:is_empty() and (condition == nil or condition(stack, src_inventory, src_list, dst_inventory, dst_list)) then
return i
end
end
return nil
end
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-- Returns true if itemstack is a shulker box
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local function is_not_shulker_box(itemstack)
local g = minetest.get_item_group(itemstack:get_name(), "shulker_box")
return g == 0 or g == nil
end
-- Moves a single item from one inventory to another.
--- source_inventory: Inventory to take the item from
--- source_list: List name of the source inventory from which to take the item
--- source_stack_id: The inventory position ID of the source inventory to take the item from (-1 for first occupied slot)
--- destination_inventory: Put item into this inventory
--- destination_list: List name of the destination inventory to which to put the item into
-- Returns true on success and false on failure
-- Possible failures: No item in source slot, destination inventory full
function mcl_util.move_item(source_inventory, source_list, source_stack_id, destination_inventory, destination_list)
if source_stack_id == -1 then
source_stack_id = mcl_util.get_first_occupied_inventory_slot(source_inventory, source_list)
if source_stack_id == nil then
return false
end
end
if not source_inventory:is_empty(source_list) then
local stack = source_inventory:get_stack(source_list, source_stack_id)
if not stack:is_empty() then
local new_stack = ItemStack(stack)
new_stack:set_count(1)
if not destination_inventory:room_for_item(destination_list, new_stack) then
return false
end
stack:take_item()
source_inventory:set_stack(source_list, source_stack_id, stack)
destination_inventory:add_item(destination_list, new_stack)
return true
end
end
return false
end
-- Moves a single item from one container node into another. Performs a variety of high-level
-- checks to prevent invalid transfers such as shulker boxes into shulker boxes
--- source_pos: Position ({x,y,z}) of the node to take the item from
--- destination_pos: Position ({x,y,z}) of the node to put the item into
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--- source_list (optional): List name of the source inventory from which to take the item. Default is normally "main"; "dst" for furnace
--- source_stack_id (optional): The inventory position ID of the source inventory to take the item from (-1 for slot of the first valid item; -1 is default)
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--- destination_list (optional): List name of the destination inventory. Default is normally "main"; "src" for furnace
-- Returns true on success and false on failure.
function mcl_util.move_item_container(source_pos, destination_pos, source_list, source_stack_id, destination_list)
local dpos = table.copy(destination_pos)
local spos = table.copy(source_pos)
local snode = minetest.get_node(spos)
local dnode = minetest.get_node(dpos)
local dctype = minetest.get_item_group(dnode.name, "container")
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local sctype = minetest.get_item_group(snode.name, "container")
-- Container type 7 does not allow any movement
if sctype == 7 then
return false
end
-- Normalize double container by forcing to always use the left segment first
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local function normalize_double_container(pos, node, ctype)
if ctype == 6 then
pos = mcl_util.get_double_container_neighbor_pos(pos, node.param2, "right")
if not pos then
return false
end
node = minetest.get_node(pos)
ctype = minetest.get_item_group(node.name, "container")
-- The left segment seems incorrect? We better bail out!
if ctype ~= 5 then
return false
end
end
return pos, node, ctype
end
spos, snode, sctype = normalize_double_container(spos, snode, sctype)
dpos, dnode, dctype = normalize_double_container(dpos, dnode, dctype)
if not spos or not dpos then return false end
local smeta = minetest.get_meta(spos)
local dmeta = minetest.get_meta(dpos)
local sinv = smeta:get_inventory()
local dinv = dmeta:get_inventory()
-- Default source lists
if not source_list then
-- Main inventory for most container types
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if sctype == 2 or sctype == 3 or sctype == 5 or sctype == 6 or sctype == 7 then
source_list = "main"
-- Furnace: output
elseif sctype == 4 then
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source_list = "dst"
-- Unknown source container type. Bail out
else
return false
end
end
-- Automatically select stack slot ID if set to automatic
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if not source_stack_id then
source_stack_id = -1
end
if source_stack_id == -1 then
local cond = nil
-- Prevent shulker box inception
if dctype == 3 then
cond = is_not_shulker_box
end
source_stack_id = mcl_util.get_eligible_transfer_item_slot(sinv, source_list, dinv, dpos, cond)
if not source_stack_id then
-- Try again if source is a double container
if sctype == 5 then
spos = mcl_util.get_double_container_neighbor_pos(spos, snode.param2, "left")
smeta = minetest.get_meta(spos)
sinv = smeta:get_inventory()
source_stack_id = mcl_util.get_eligible_transfer_item_slot(sinv, source_list, dinv, dpos, cond)
if not source_stack_id then
return false
end
else
return false
end
end
end
-- Abort transfer if shulker box wants to go into shulker box
if dctype == 3 then
local stack = sinv:get_stack(source_list, source_stack_id)
if stack and minetest.get_item_group(stack:get_name(), "shulker_box") == 1 then
return false
end
end
-- Container type 7 does not allow any placement
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if dctype == 7 then
return false
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end
-- If it's a container, put it into the container
if dctype ~= 0 then
-- Automatically select a destination list if omitted
if not destination_list then
-- Main inventory for most container types
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if dctype == 2 or dctype == 3 or dctype == 5 or dctype == 6 or dctype == 7 then
destination_list = "main"
-- Furnace source slot
elseif dctype == 4 then
destination_list = "src"
end
end
if destination_list then
-- Move item
local ok = mcl_util.move_item(sinv, source_list, source_stack_id, dinv, destination_list)
-- Try transfer to neighbor node if transfer failed and double container
if not ok and dctype == 5 then
dpos = mcl_util.get_double_container_neighbor_pos(dpos, dnode.param2, "left")
dmeta = minetest.get_meta(dpos)
dinv = dmeta:get_inventory()
ok = mcl_util.move_item(sinv, source_list, source_stack_id, dinv, destination_list)
end
-- Update furnace
if ok and dctype == 4 then
-- Start furnace's timer function, it will sort out whether furnace can burn or not.
minetest.get_node_timer(dpos):start(1.0)
end
return ok
end
end
return false
end
-- Returns the ID of the first non-empty slot in the given inventory list
-- or nil, if inventory is empty.
function mcl_util.get_first_occupied_inventory_slot(inventory, listname)
return mcl_util.get_eligible_transfer_item_slot(inventory, listname)
end
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function mcl_util.drop_items_from_meta_container(listname)
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return function(pos, oldnode, oldmetadata)
local meta = minetest.get_meta(pos)
local meta2 = meta:to_table()
if oldmetadata then
meta:from_table(oldmetadata)
end
local inv = meta:get_inventory()
for i = 1, inv:get_size(listname) do
local stack = inv:get_stack(listname, i)
if not stack:is_empty() then
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local p = vector.add(pos, vector.new(math.random() - 0.5, 0, math.random(0, 10)/10 - 0.5))
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minetest.add_item(p, stack)
end
end
meta:from_table(meta2)
end
end
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-- Returns true if item (itemstring or ItemStack) can be used as a furnace fuel.
-- Returns false otherwise
function mcl_util.is_fuel(item)
return minetest.get_craft_result({method="fuel", width=1, items={item}}).time ~= 0
end
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-- Returns a on_place function for plants
-- * condition: function(pos, node, itemstack)
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-- * A function which is called by the on_place function to check if the node can be placed
-- * Must return true, if placement is allowed, false otherwise.
-- * If it returns a string, placement is allowed, but will place this itemstring as a node instead
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-- * pos, node: Position and node table of plant node
-- * itemstack: Itemstack to place
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function mcl_util.generate_on_place_plant_function(condition)
return function(itemstack, placer, pointed_thing)
if pointed_thing.type ~= "node" then
-- no interaction possible with entities
return itemstack
end
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-- Call on_rightclick if the pointed node defines it
local node = minetest.get_node(pointed_thing.under)
if placer and not placer:get_player_control().sneak then
if minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].on_rightclick then
return minetest.registered_nodes[node.name].on_rightclick(pointed_thing.under, node, placer, itemstack) or itemstack
end
end
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local place_pos
local def_under = minetest.registered_nodes[minetest.get_node(pointed_thing.under).name]
local def_above = minetest.registered_nodes[minetest.get_node(pointed_thing.above).name]
if not def_under or not def_above then
return itemstack
end
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if def_under.buildable_to then
place_pos = pointed_thing.under
elseif def_above.buildable_to then
place_pos = pointed_thing.above
else
return itemstack
end
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-- Check placement rules
local result, param2 = condition(place_pos, node, itemstack)
if result == true then
local idef = itemstack:get_definition()
local new_itemstack, success = minetest.item_place_node(itemstack, placer, pointed_thing, param2)
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if success then
if idef.sounds and idef.sounds.place then
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minetest.sound_play(idef.sounds.place, {pos=pointed_thing.above, gain=1}, true)
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end
end
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itemstack = new_itemstack
end
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return itemstack
end
end
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-- adjust the y level of an object to the center of its collisionbox
-- used to get the origin position of entity explosions
function mcl_util.get_object_center(obj)
local collisionbox = obj:get_properties().collisionbox
local pos = obj:get_pos()
local ymin = collisionbox[2]
local ymax = collisionbox[5]
pos.y = pos.y + (ymax - ymin) / 2.0
return pos
end
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function mcl_util.get_color(colorstr)
local mc_color = mcl_colors[colorstr:upper()]
if mc_color then
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colorstr = mc_color
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elseif #colorstr ~= 7 or colorstr:sub(1, 1) ~= "#" then
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return
end
local hex = tonumber(colorstr:sub(2, 7), 16)
if hex then
return colorstr, hex
end
end
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function mcl_util.call_on_rightclick(itemstack, player, pointed_thing)
-- Call on_rightclick if the pointed node defines it
if pointed_thing and pointed_thing.type == "node" then
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local pos = pointed_thing.under
local node = minetest.get_node(pos)
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if player and not player:get_player_control().sneak then
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local nodedef = minetest.registered_nodes[node.name]
local on_rightclick = nodedef and nodedef.on_rightclick
if on_rightclick then
return on_rightclick(pos, node, player, itemstack, pointed_thing) or itemstack
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end
end
end
end
function mcl_util.calculate_durability(itemstack)
local unbreaking_level = mcl_enchanting.get_enchantment(itemstack, "unbreaking")
local armor_uses = minetest.get_item_group(itemstack:get_name(), "mcl_armor_uses")
local uses
if armor_uses > 0 then
uses = armor_uses
if unbreaking_level > 0 then
uses = uses / (0.6 + 0.4 / (unbreaking_level + 1))
end
else
local def = itemstack:get_definition()
if def then
local fixed_uses = def._mcl_uses
if fixed_uses then
uses = fixed_uses
if unbreaking_level > 0 then
uses = uses * (unbreaking_level + 1)
end
end
end
local _, groupcap = next(itemstack:get_tool_capabilities().groupcaps)
uses = uses or (groupcap or {}).uses
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end
return uses or 0
end
function mcl_util.use_item_durability(itemstack, n)
local uses = mcl_util.calculate_durability(itemstack)
itemstack:add_wear(65535 / uses * n)
end
function mcl_util.deal_damage(target, damage, mcl_reason)
local luaentity = target:get_luaentity()
if luaentity then
if luaentity.deal_damage then
luaentity:deal_damage(damage, mcl_reason or {type = "generic"})
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return
elseif luaentity._cmi_is_mob then
-- local puncher = mcl_reason and mcl_reason.direct or target
-- target:punch(puncher, 1.0, {full_punch_interval = 1.0, damage_groups = {fleshy = damage}}, vector.direction(puncher:get_pos(), target:get_pos()), damage)
if luaentity.health > 0 then
luaentity.health = luaentity.health - damage
end
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return
end
end
local hp = target:get_hp()
if hp > 0 then
target:set_hp(hp - damage, {_mcl_reason = mcl_reason})
end
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end
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function mcl_util.get_hp(obj)
local luaentity = obj:get_luaentity()
if luaentity and luaentity._cmi_is_mob then
return luaentity.health
else
return obj:get_hp()
end
end
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function mcl_util.get_inventory(object, create)
if object:is_player() then
return object:get_inventory()
else
local luaentity = object:get_luaentity()
local inventory = luaentity.inventory
if create and not inventory and luaentity.create_inventory then
inventory = luaentity:create_inventory()
end
return inventory
end
end
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function mcl_util.get_wielded_item(object)
if object:is_player() then
return object:get_wielded_item()
else
-- ToDo: implement getting wielditems from mobs as soon as mobs have wielditems
return ItemStack()
end
end
function mcl_util.get_object_name(object)
if object:is_player() then
return object:get_player_name()
else
local luaentity = object:get_luaentity()
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if not luaentity then
return tostring(object)
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end
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return luaentity.nametag and luaentity.nametag ~= "" and luaentity.nametag or luaentity.description or luaentity.name
end
end
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function mcl_util.replace_mob(obj, mob)
local rot = obj:get_yaw()
local pos = obj:get_pos()
obj:remove()
obj = minetest.add_entity(pos, mob)
obj:set_yaw(rot)
return obj
end
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function mcl_util.get_pointed_thing(player, liquid)
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local pos = vector.offset(player:get_pos(), 0, player:get_properties().eye_height, 0)
local look_dir = vector.multiply(player:get_look_dir(), 5)
local pos2 = vector.add(pos, look_dir)
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local ray = minetest.raycast(pos, pos2, false, liquid)
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if ray then
for pointed_thing in ray do
return pointed_thing
end
end
end