Minetest-WorldEditAdditions/worldeditadditions/lib/copy.lua

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local wea_c = worldeditadditions_core
local Vector3 = wea_c.Vector3
---
-- @module worldeditadditions
-- TODO add `minetest.find_nodes_with_meta(pos1, pos2)` support ref https://github.com/minetest/minetest/blob/5.9.1/doc/lua_api.md?plain=1#L6112 for locked chests, inventories etc. Perhaps for copy add a flag to allow for disabling such support?
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--- Copies a region to another location, potentially overwriting the exiting region.
-- @param source_pos1 Vector3 pos1 of the source region to copy.
-- @param source_pos2 Vector3 pos2 of the source region to copy.
-- @param target_pos1 Vector3 pos1 of the target region to copy to.
-- @param target_pos2 Vector3 pos2 of the target region to copy to.
-- @param airapply=false bool Whether to only replace target nodes that are air-like, leaving those that are not air-like. If false, then all target nodes are replaced regardless of whether they are air-like nodes or not.
-- @returns bool,numbers 1. Whether the copy operation was successful or not
-- 2. The total number of nodes copied.
function worldeditadditions.copy(source_pos1, source_pos2, target_pos1, target_pos2, airapply)
if airapply == nil then airapply = false end
source_pos1, source_pos2 = Vector3.sort(source_pos1, source_pos2)
target_pos1, target_pos2 = Vector3.sort(target_pos1, target_pos2)
local offset = source_pos1:subtract(target_pos1)
-- {source,target}_pos2 will always have the highest co-ordinates now
-- Fetch the nodes in the source area
local manip_source, area_source = worldedit.manip_helpers.init(source_pos1, source_pos2)
local data_source = manip_source:get_data()
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local data_source_param2 = manip_source:get_param2_data()
-- Fetch a manip for the target area
local manip_target, area_target = worldedit.manip_helpers.init(target_pos1, target_pos2)
local data_target = manip_target:get_data()
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local data_target_param2 = manip_target:get_param2_data()
-- z y x is the preferred loop order (because CPU cache, since then we're iterating linearly through the data array backwards. This only holds true for little-endian machines however)
local total_replaced = 0
for z = source_pos2.z, source_pos1.z, -1 do
for y = source_pos2.y, source_pos1.y, -1 do
for x = source_pos2.x, source_pos1.x, -1 do
local source = Vector3.new(x, y, z)
local source_i = area_source:index(x, y, z)
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local target = source - offset
local target_i = area_target:index(target.x, target.y, target.z)
local should_replace = true
if airapply then
should_replace = wea_c.is_airlike(data_target[target_i])
end
if should_replace then
data_target[target_i] = data_source[source_i]
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data_target_param2[target_i] = data_source_param2[source_i]
total_replaced = total_replaced + 1
end
end
end
end
-- Save the modified nodes back to disk & return
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manip_target:set_param2_data(data_target_param2)
worldedit.manip_helpers.finish(manip_target, data_target)
return true, total_replaced
end