Decrease the amount of garbage saved in save files

1 files changed, 15 insertions, 0 deletions

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

+