From 4406654fa4c031882aaffddd6608ba011b8174c3 Mon Sep 17 00:00:00 2001
From: Anthony Zhang <azhang9@gmail.com>
Date: Mon, 11 Mar 2013 17:37:50 -0400
Subject: [PATCH] Support metadata in piston pushing (so that microcontrollers
 and such can be pushed), support pushing chests (not locked ones though), and
 add two missing rules for pistons (z- top and bottom, but not z- itself).
 This still avoids the piston pushing power source issue.

---
 mesecons_mvps/init.lua    | 8 ++++++--
 mesecons_pistons/init.lua | 4 +++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/mesecons_mvps/init.lua b/mesecons_mvps/init.lua
index 9c94757..6107ba3 100644
--- a/mesecons_mvps/init.lua
+++ b/mesecons_mvps/init.lua
@@ -57,6 +57,7 @@ function mesecon:mvps_push(pos, dir, maximum) -- pos: pos of mvps; dir: directio
 
 	-- remove all nodes
 	for _, n in ipairs(nodes) do
+		n.meta = minetest.env:get_meta(n.pos):to_table()
 		minetest.env:remove_node(n.pos)
 	end
 
@@ -70,6 +71,7 @@ function mesecon:mvps_push(pos, dir, maximum) -- pos: pos of mvps; dir: directio
 	for _, n in ipairs(nodes) do
 		np = mesecon:addPosRule(n.pos, dir)
 		minetest.env:add_node(np, n.node)
+		minetest.env:get_meta(np):from_table(n.meta)
 	end
 
 	for i in ipairs(nodes) do
@@ -85,8 +87,10 @@ function mesecon:mvps_pull_single(pos, dir) -- pos: pos of mvps; direction: dire
 
 	if minetest.registered_nodes[nn.name].liquidtype == "none"
 	and not mesecon:is_mvps_stopper(nn, {x = -dir.x, y = -dir.y, z = -dir.z}, {{pos = np, node = nn}}, 1) then
+		local meta = minetest.env:get_meta(np):to_table()
 		minetest.env:remove_node(np)
 		minetest.env:add_node(pos, nn)
+		minetest.env:get_meta(pos):from_table(meta)
 
 		nodeupdate(np)
 		nodeupdate(pos)
@@ -107,7 +111,8 @@ function mesecon:mvps_pull_all(pos, direction) -- pos: pos of mvps; direction: d
 
 		local oldpos = {x=lpos2.x+direction.x, y=lpos2.y+direction.y, z=lpos2.z+direction.z}
 		repeat
-			minetest.env:add_node(oldpos, {name=minetest.env:get_node(lpos2).name})
+			lnode2 = minetest.env:get_node(lpos2)
+			minetest.env:add_node(oldpos, {name=lnode2.name})
 			nodeupdate(oldpos)
 			oldpos = {x=lpos2.x, y=lpos2.y, z=lpos2.z}
 			lpos2.x = lpos2.x-direction.x
@@ -118,6 +123,5 @@ function mesecon:mvps_pull_all(pos, direction) -- pos: pos of mvps; direction: d
 		minetest.env:remove_node(oldpos)
 end
 
-mesecon:register_mvps_stopper("default:chest")
 mesecon:register_mvps_stopper("default:chest_locked")
 mesecon:register_mvps_stopper("default:furnace")
diff --git a/mesecons_pistons/init.lua b/mesecons_pistons/init.lua
index d496b1e..4998ae6 100644
--- a/mesecons_pistons/init.lua
+++ b/mesecons_pistons/init.lua
@@ -8,7 +8,9 @@ piston_rules =
  {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=-1, z=-1}}
 
 local piston_get_rules = function (node)
 	local rules = piston_rules