/assets/blender/mbb/

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local lot = os.clock()
minetest.log("action", "[advtrains] Loading...")

-- Boilerplate to support localized strings if intllib mod is installed.
if minetest.get_modpath("intllib") then
    attrans = intllib.Getter()
else
    attrans = function(s,a,...)a={a,...}return s:gsub("@(%d+)",function(n)return a[tonumber(n)]end)end
end

--advtrains

--Constant for maximum connection value/division of the circle
AT_CMAX = 16

advtrains = {trains={}, player_to_train_mapping={}}

--pcall
local no_action=false

local function reload_saves()
	atwarn("Restoring saved state in 1 second...")
	no_action=true
	--read last save state and continue, as if server was restarted
	for aoi, le in pairs(minetest.luaentities) do
		if le.is_wagon then
			le.object:remove()
		end
	end
	minetest.after(1, function()
		advtrains.load()
		atwarn("Reload successful!")
		advtrains.ndb.restore_all()
	end)
end

function advtrains.pcall(fun)
	if no_action then return end
	
	local succ, return1, return2, return3, return4=xpcall(fun, function(err)
			atwarn("Lua Error occured: ", err)
			atwarn(debug.traceback())
			if advtrains.atprint_context_tid then
				advtrains.path_print(advtrains.trains[advtrains.atprint_context_tid], atdebug)
			end
		end)
	if not succ then
		reload_saves()
	else
		return return1, return2, return3, return4
	end
end


advtrains.modpath = minetest.get_modpath("advtrains")

function advtrains.print_concat_table(a)
	local str=""
	local stra=""
	local t
	for i=1,20 do
		t=a[i]
		if t==nil then
			stra=stra.."nil "
		else
			str=str..stra
			stra=""
			if type(t)=="table" then
				if t.x and t.y and t.z then
					str=str..minetest.pos_to_string(t)
				elseif t.p and t.s then -- interlocking sigd
					str=str.."("..minetest.pos_to_string(t.p).."/"..t.s..")"
				else
					str=str..dump(t)
				end
			elseif type(t)=="boolean" then
				if t then
					str=str.."true"
				else
					str=str.."false"
				end
			elseif type(t)=="function" then
				str=str.."<function>"
			elseif type(t)=="userdata" then
				str=str.."<userdata>"
			else
				str=str..t
			end
			str=str.." "
		end
	end
	return str
end

atprint=function() end
atlog=function(t, ...)
	local text=advtrains.print_concat_table({t, ...})
	minetest.log("action", "[advtrains]"..text)
end
atwarn=function(t, ...)
	local text=advtrains.print_concat_table({t, ...})
	minetest.log("warning", "[advtrains]"..text)
	minetest.chat_send_all("[advtrains] -!- "..text)
end
sid=function(id) if id then return string.sub(id, -6) end end


--ONLY use this function for temporary debugging. for consistent debug prints use atprint
atdebug=function(t, ...)
	local text=advtrains.print_concat_table({t, ...})
	minetest.log("action", "[advtrains]"..text)
	minetest.chat_send_all("[advtrains]"..text)
end

if minetest.settings:get_bool("advtrains_enable_debugging") then
	atprint=function(t, ...)
		local context=advtrains.atprint_context_tid or ""
		if not context then return end
		local text=advtrains.print_concat_table({t, ...})
		advtrains.drb_record(context, text)
		
		--atlog("@@",advtrains.atprint_context_tid,t,...)
	end
	dofile(advtrains.modpath.."/debugringbuffer.lua")
	
end

function assertt(var, typ)
	if type(var)~=typ then
		error("Assertion failed, variable has to be of type "..typ)
	end
end

dofile(advtrains.modpath.."/helpers.lua");
--dofile(advtrains.modpath.."/debugitems.lua");

advtrains.meseconrules = 
{{x=0,  y=0,  z=-1},
 {x=1,  y=0,  z=0},
 {x=-1, y=0,  z=0},
 {x=0,  y=0,  z=1},
 {x=1,  y=1,  z=0},
 {x=1,  y=-1, z=0},
 {x=-1, y=1,  z=0},
 {x=-1, y=-1, z=0},
 {x=0,  y=1,  z=1},
 {x=0,  y=-1, z=1},
 {x=0,  y=1,  z=-1},
 {x=0,  y=-1, z=-1},
 {x=0, y=-2, z=0}}