Support metadata in piston pushing (so that microcontrollers and such can be...

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

@@ -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")

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