fix pump issue (silo source items can disappear)

liquids/node_api.lua

@@ -162,6 +162,17 @@ function liquid.take(pos, outdir, name, amount, player_name)
 	return taken, item_name
 end
 
+function liquid.untake(pos, outdir, name, amount, player_name)
+	for _,item in ipairs(get_network_table(pos, outdir, "tank")) do
+		local liquid = LQD(item.pos)
+		if liquid and liquid.untake then
+			amount = liquid.untake(item.pos, item.indir, name, amount)
+			if not amount or amount == 0 then break end
+		end
+	end
+	return amount or 0
+end
+
 --
 -- Server local functions
 --

liquids/pump.lua

@@ -70,7 +70,7 @@ local function pumping(pos, nvm, state, capa)
 	if taken > 0 then
 		local leftover = liquid.put(pos, outdir, name, taken, starter)
 		if leftover and leftover == taken then
-			liquid.put(pos, Flip[outdir], name, leftover)
+			liquid.untake(pos, Flip[outdir], name, leftover)
 			state:blocked(pos, nvm)
 			return
 		end

liquids/silo.lua

@@ -126,6 +126,15 @@ local tLiquid = {
 		end
 		return 0
 	end,
+	untake = function(pos, indir, name, amount)
+		local inv = M(pos):get_inventory()
+		local stack = ItemStack(name.." "..amount)
+		if inv:room_for_item("main", stack) then
+			inv:add_item("main", stack)
+			return 0
+		end
+		return amount
+	end,
 }
 
 local tNetworks = {

liquids/tank.lua

@@ -67,6 +67,15 @@ local function put_liquid(pos, indir, name, amount)
 	return amount
 end
 
+local function untake_liquid(pos, indir, name, amount)
+	local leftover = liquid.srv_put(pos, indir, name, amount)
+	if techage.is_activeformspec(pos) then
+		local nvm = techage.get_nvm(pos)
+		M(pos):set_string("formspec", liquid.formspec(pos, nvm))
+	end
+	return leftover
+end
+
 local networks_def = {
 	pipe2 = {
 		sides = techage.networks.AllSides, -- Pipe connection sides
@@ -110,6 +119,7 @@ minetest.register_node("techage:ta3_tank", {
 		peek = liquid.srv_peek,
 		put = put_liquid,
 		take = take_liquid,
+		untake = untake_liquid,
 	},
 	networks = networks_def,
 	on_rightclick = on_rightclick,
@@ -168,6 +178,7 @@ minetest.register_node("techage:oiltank", {
 		peek = liquid.srv_peek,
 		put = put_liquid,
 		take = take_liquid,
+		untake = untake_liquid,
 	},
 	networks = networks_def,
 	on_rightclick = on_rightclick,
@@ -216,6 +227,7 @@ minetest.register_node("techage:ta4_tank", {
 		peek = liquid.srv_peek,
 		put = put_liquid,
 		take = take_liquid,
+		untake = untake_liquid,
 	},
 	networks = networks_def,
 	on_rightclick = on_rightclick,