adding crafting recipes

crafting.lua

@@ -0,0 +1,92 @@
+--"waterworks:pipe"
+if minetest.get_modpath("pipeworks") then
+minetest.register_craft( {
+    output = "waterworks:pipe 12",
+    recipe = {
+        { "default:steel_ingot", "", "default:steel_ingot" },
+        { "default:steel_ingot", "", "default:steel_ingot" },
+        { "default:steel_ingot", "", "default:steel_ingot" }
+    },
+})
+else
+minetest.register_craft( {
+    output = "waterworks:pipe 12",
+    recipe = {
+        { "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" },
+        { "", "", "" },
+        { "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+    },
+})
+end
+
+--"waterworks:valve_on"
+minetest.register_craft( {
+    output = "waterworks:valve_on",
+    recipe = {
+        { "default:steel_ingot", "", "default:steel_ingot" },
+        { "", "waterworks:pipe", "" },
+        { "default:steel_ingot", "", "default:steel_ingot" }
+    },
+})
+
+--"waterworks:inlet"
+minetest.register_craft( {
+    output = "waterworks:inlet",
+    recipe = {
+        { "default:steel_ingot", "", "" },
+        { "", "waterworks:pipe", "" },
+        { "default:steel_ingot", "", "" }
+    },
+})
+--"waterworks:pumped_inlet"
+minetest.register_craft( {
+    output = "waterworks:pumped_inlet",
+    recipe = {
+        { "default:steel_ingot", "", "" },
+        { "default:mese_crystal_fragment", "waterworks:pipe", "" },
+        { "default:steel_ingot", "", "" }
+    },
+})
+minetest.register_craft( {
+    output = "waterworks:pumped_inlet",
+    recipe = {
+        { "default:mese_crystal_fragment", "waterworks:inlet"},
+    },
+})
+
+--"waterworks:outlet"
+minetest.register_craft( {
+    output = "waterworks:outlet",
+    recipe = {
+        { "", "", "default:steel_ingot" },
+        { "", "waterworks:pipe", "" },
+        { "", "", "default:steel_ingot" }
+    },
+})
+
+--"waterworks:grate"
+minetest.register_craft( {
+    output = "waterworks:grate",
+    recipe = {
+        { "", "default:steel_ingot", "" },
+        { "", "waterworks:pipe", "" },
+        { "", "default:steel_ingot", "" }
+    },
+})
+
+-- Allow the basic connectors to be cycled through
+minetest.register_craft( {
+    output = "waterworks:inlet",
+	type = "shapeless",
+    recipe = { "waterworks:outlet"},
+})
+minetest.register_craft( {
+    output = "waterworks:outlet",
+	type = "shapeless",
+    recipe = {"waterworks:grate"},
+})
+minetest.register_craft( {
+    output = "waterworks:grate",
+	type = "shapeless",
+    recipe = {"waterworks:inlet"},
+})

execute.lua

@@ -1,3 +1,5 @@
+local pressure_margin = 20
+
 local pipe_cache = {}
 
 local cardinal_dirs = {
@@ -124,10 +126,12 @@ waterworks.execute_pipes = function(net_index, net_capacity)
 	local inlets
 	local outlets
 	
-	if net.cache_valid then	
+	if net.cache_valid then
+		-- We don't need to recalculate, nothing about the pipe network has changed since last time
 		inlets = pipe_cache[net_index].inlets
 		outlets = pipe_cache[net_index].outlets
 	else
+		-- Find all the inlets and outlets and sort them by pressure
 		inlets = {}
 		if net.connected.inlet ~= nil then
 			for _, inlet_set in pairs(net.connected.inlet) do
@@ -148,6 +152,7 @@ waterworks.execute_pipes = function(net_index, net_capacity)
 		end
 		table.sort(outlets, sort_by_pressure)
 		
+		-- Cache the results
 		pipe_cache[net_index] = {}
 		pipe_cache[net_index].inlets = inlets
 		pipe_cache[net_index].outlets = outlets
@@ -171,7 +176,9 @@ waterworks.execute_pipes = function(net_index, net_capacity)
 		--minetest.debug("source: " .. dump(source))
 		--minetest.debug("sink: " .. dump(sink))
 		
-		if source.pressure >= sink.pressure then
+		-- pressure_margin allows us to check sources that are a little bit below sinks,
+		-- in case the extra pressure from their water depth is sufficient to force water through
+		if source.pressure + pressure_margin >= sink.pressure then 
 			local source_pos = find_source(source.target)
 			local sink_pos
 			if source_pos ~= nil then

init.lua

@@ -6,6 +6,7 @@ dofile(modpath .. "/globalstep.lua")
 dofile(modpath .. "/network.lua")
 dofile(modpath .. "/execute.lua")
 dofile(modpath .. "/nodes.lua")
+dofile(modpath .. "/crafting.lua")
 
 if minetest.settings:get_bool("waterworks_make_default_water_non_renewable") then
 	local override_def = {liquid_renewable = false}
@@ -14,8 +15,8 @@ if minetest.settings:get_bool("waterworks_make_default_water_non_renewable") the
 
 end
 
--- For test purposes, this rebuilds pipe networks without needing to persist them.
--- May be useful later for fixing broken stuff.
+-- This rebuilds pipe networks whenever the map block is loaded.
+-- May be useful for fixing broken stuff.
 -- Note that this doesn't *remove* pipes that are inappropriately listed in the network,
 -- that may be tricky.
 --minetest.register_lbm({

nodes.lua

@@ -88,9 +88,10 @@ minetest.register_node("waterworks:valve_off", {
         connect_left = {-0.5, -0.375, -0.375, -0.4375, 0.375, 0.375},
     },
 	paramtype = "light",
+	drops = "waterworks:valve_on",
 
 	is_ground_content = false,
-	groups = {oddly_breakable_by_hand = 1, waterworks_inert = 1},
+	groups = {oddly_breakable_by_hand = 1, waterworks_inert = 1, not_in_creative_inventory = 1},
 	sounds = default.node_sound_metal_defaults(),
 	on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
 		node.name = "waterworks:valve_on"