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Lua License
-----------

Lua is licensed under the terms of the MIT license reproduced below.
This means that Lua is free software and can be used for both academic
and commercial purposes at absolutely no cost.

For details and rationale, see http://www.lua.org/license.html .

===============================================================================

Copyright (C) 1994-2008 Lua.org, PUC-Rio.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

===============================================================================

(end of COPYRIGHT)
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--clipboard = {trainlen = number, [n] = {type = string, flipped = bool, }

-- Yaw is in radians. There are 2pi rad in a circle. North is the 0 point and the angle increases anticlockwise.
-- 4.712389 = 1.5pi; sin(1.5pi) = -1
-- 7.853981 = 2.5pi; sin(2.5pi) = 1

minetest.register_tool("advtrains:copytool", {
	description = attrans("Train copy/paste tool\n\nLeft-click: copy train\nRight-click: paste train"),
	inventory_image = "advtrains_copytool.png",
	wield_image = "advtrains_copytool.png",
	stack_max = 1,
	-- Paste: Take the clipboard and the player yaw, and attempt to place a new train in the world.
	-- The front of the train is used as the start of the new train and it proceeds backwards from
	-- the direction of travel.
	on_place = function(itemstack, placer, pointed_thing)
			return advtrains.pcall(function()
				if ((not pointed_thing.type == "node") or (not placer.get_player_name)) then
					return
				end
				local pname = placer:get_player_name()

				local node=minetest.get_node_or_nil(pointed_thing.under)
				if not node then atprint("[advtrains]Ignore at placer position") return itemstack end
				local nodename=node.name
				if(not advtrains.is_track_and_drives_on(nodename, {default=true})) then
					atprint("no track here, not placing.")
					return itemstack
				end
				if not minetest.check_player_privs(placer, {train_operator = true }) then
					minetest.chat_send_player(pname, "You don't have the train_operator privilege.")
					return itemstack
				end
				if not minetest.check_player_privs(placer, {train_admin = true }) and minetest.is_protected(pointed_thing.under, placer:get_player_name()) then
					return itemstack
				end
				local tconns=advtrains.get_track_connections(node.name, node.param2)
				local yaw = placer:get_look_horizontal()
				local plconnid = advtrains.yawToClosestConn(yaw, tconns)

				local prevpos = advtrains.get_adjacent_rail(pointed_thing.under, tconns, plconnid, {default=true})
				if not prevpos then