From 07442cfe8ff1a23053446c18e2ada854eeed18d8 Mon Sep 17 00:00:00 2001
From: orwell96 <orwell@bleipb.de>
Date: Sun, 7 Jan 2018 19:00:43 +0100
Subject: Decrease the amount of garbage saved in save files

---
 advtrains/helpers.lua | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'advtrains/helpers.lua')

diff --git a/advtrains/helpers.lua b/advtrains/helpers.lua
index 3864d81..5f5521f 100644
--- a/advtrains/helpers.lua
+++ b/advtrains/helpers.lua
@@ -150,6 +150,13 @@ function advtrains.merge_tables(a, ...)
 	end
 	return new
 end
+function advtrains.save_keys(tbl, keys)
+	local new={}
+	for _,key in ipairs(keys) do
+		new[key] = tbl[key]
+	end
+	return new
+end
 function advtrains.yaw_from_3_positions(prev, curr, next)
 	local pts=minetest.pos_to_string
 	--atprint("p3 "..pts(prev)..pts(curr)..pts(next))
@@ -315,3 +322,11 @@ function advtrains.get_matching_conn(conn, nconns)
 	return connlku[nconns][conn]
 end
 
+function advtrains.random_id()
+	local idst=""
+	for i=0,5 do
+		idst=idst..(math.random(0,9))
+	end
+	return idst
+end
+
-- 
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