Require a water supply if pipeworks is installed

README

@@ -1,3 +1,3 @@
 This mod adds an ice machine, ice bin, and ice cubes.
 
-To make the machine work, place it on top of an ice bin and turn it on. It will slowly produce ice cubes and eject them into the bin. The cubes can then be crafted (9 at a time) into ice blocks. If technic is installed, these ice blocks can then be ground into snow if desired.
+To make the machine work, place it on top of an ice bin and turn it on. If pipeworks is installed, a pipe carrying water must be within 1m of the machine. After right-clicking and turning the machine on, it will slowly produce ice cubes and eject them into the bin. The cubes can then be crafted (9 at a time) into ice blocks. If technic is installed, these ice blocks can then be ground into snow if desired.

init.lua

@@ -1,11 +1,31 @@
-local function set_formspec(meta,enabled,full)
+local pipeworks_installed = minetest.get_modpath("pipeworks")
+
+local function find_water_supply(pos)
+	if not pipeworks_installed then return true end
+	local minp = vector.add(pos,vector.new(-1,-1,-1))
+	local maxp = vector.add(pos,vector.new(1,1,1))
+	local nodes = minetest.find_nodes_in_area(minp,maxp,"group:pipe")
+	for _,pos in pairs(nodes) do
+		local node = minetest.get_node(pos)
+		if string.match(node.name,"^pipeworks:.*_loaded$") then
+			return true
+		end
+	end
+	return false
+end
+
+local function set_formspec(meta,enabled,full,water)
 	local status
 	if enabled then
+		if water then
 			if full then
 				status = "Full Bin"
 			else
 				status = "Making Ice"
 			end
+		else
+			status = "Water Error"
+		end
 	else
 		status = "Off"
 	end
@@ -23,17 +43,23 @@ local function update_status(pos,meta,ice)
 		timer:stop()
 		set_formspec(meta,false)
 	else
+		local water = find_water_supply(pos)
 		local binpos = vector.add(pos,vector.new(0,-1,0))
 		local binnode = minetest.get_node(binpos)
 		local binmeta = minetest.get_meta(binpos)
 		local bininv = binmeta:get_inventory()
 		if binnode.name ~= "icemachine:bin" or not bininv:room_for_item("ice","icemachine:cube") then
 			timer:stop()
-			set_formspec(meta,true,true)
+			set_formspec(meta,true,true,true)
 		else
+			if water then
 				if not timer:is_started() then timer:start(30) end
 				if ice then bininv:add_item("ice","icemachine:cube 9") end
-			set_formspec(meta,true,false)
+				set_formspec(meta,true,false,true)
+			else
+				timer:stop()
+				set_formspec(meta,true,false,false)
+			end
 		end
 	end
 end