add initial support for tapping technic power cables

class_layout.lua

@@ -36,7 +36,8 @@ function DigtronLayout.create(pos, player)
 	self.all = {}
 	self.inventories = {}
 	self.fuelstores = {}
-	self.battery_holders = {}
+	self.battery_holders = {} -- technic batteries
+	self.power_connectors = {} -- technic power cable
 	self.diggers = {}
 	self.builders = {}
 	self.extents = {}
@@ -123,6 +124,8 @@ function DigtronLayout.create(pos, player)
 				table.insert(self.fuelstores, node_image)
 			elseif group_number == 7 then
 				table.insert(self.battery_holders, node_image)
+			elseif group_number == 8 then
+				table.insert(self.power_connectors, node_image)
 			end
 			
 			if is_protected then
@@ -320,6 +323,14 @@ function DigtronLayout.write_layout_image(self, player)
 		local old_meta = minetest.get_meta(oldpos)
 		local old_def = minetest.registered_nodes[old_node.name]
 		minetest.remove_node(oldpos)
+		
+		for _, callback in ipairs(minetest.registered_on_dignodes) do
+			-- Copy pos and node because callback can modify them
+			local pos_copy = {x=oldpos.x, y=oldpos.y, z=oldpos.z}
+			local oldnode_copy = {name=old_node.name, param1=old_node.param1, param2=old_node.param2}
+			callback(pos_copy, oldnode_copy, player)
+		end
+		
 		minetest.log("action", string.format("%s removes Digtron component %s at (%d, %d, %d)", player:get_player_name(), old_node.name, oldpos.x, oldpos.y, oldpos.z))
 		if old_def.after_dig_node ~= nil then
 			old_def.after_dig_node(oldpos, old_node, old_meta, player)
@@ -329,10 +340,21 @@ function DigtronLayout.write_layout_image(self, player)
 
 	-- create the new one
 	for k, node_image in pairs(self.all) do
-		minetest.set_node(node_image.pos, node_image.node)
-		minetest.get_meta(node_image.pos):from_table(node_image.meta)
+		local new_pos = node_image.pos
+		local new_node = node_image.node
+		local old_node = minetest.get_node(new_pos)
+		minetest.set_node(new_pos, new_node)
+		minetest.get_meta(new_pos):from_table(node_image.meta)
 		minetest.log("action", string.format("%s adds Digtron component %s at (%d, %d, %d)", player:get_player_name(), node_image.node.name, node_image.pos.x, node_image.pos.y, node_image.pos.z))
 
+		for _, callback in ipairs(minetest.registered_on_placenodes) do
+			-- Copy pos and node because callback can modify them
+			local pos_copy = {x=new_pos.x, y=new_pos.y, z=new_pos.z}
+			local oldnode_copy = {name=old_node.name, param1=old_node.param1, param2=old_node.param2}
+			local newnode_copy = {name=new_node.name, param1=new_node.param1, param2=new_node.param2}
+			callback(pos_copy, newnode_copy, player, oldnode_copy)
+		end
+
 		local new_def = minetest.registered_nodes[node_image.node.name]
 		if new_def.after_place_node ~= nil then
 			new_def.after_place_node(node_image.pos, player)

init.lua

@@ -39,6 +39,8 @@ dofile( digtron_modpath .. "/nodes/node_axle.lua" ) -- Rotation controller
 dofile( digtron_modpath .. "/nodes/node_crate.lua" ) -- Digtron portability support
 dofile( digtron_modpath .. "/nodes/recipes.lua" )
 
+dofile( digtron_modpath .. "/nodes/node_power_connector.lua")
+
 dofile( digtron_modpath .. "/upgrades.lua" ) -- various LBMs for upgrading older versions of Digtron.
 
 -- digtron group numbers:

nodes/node_crate.lua

@@ -30,7 +30,16 @@ minetest.register_node("digtron:empty_crate", {
 		
 		-- destroy everything. Note that this includes the empty crate, which will be bundled up with the layout.
 		for _, node_image in pairs(layout.all) do
-			minetest.remove_node(node_image.pos)
+			local old_pos = node_image.pos
+			local old_node = node_image.node
+			minetest.remove_node(old_pos)
+			
+			for _, callback in ipairs(minetest.registered_on_dignodes) do
+				-- Copy pos and node because callback can modify them
+				local pos_copy = {x=old_pos.x, y=old_pos.y, z=old_pos.z}
+				local oldnode_copy = {name=old_node.name, param1=old_node.param1, param2=old_node.param2}
+				callback(pos_copy, oldnode_copy, clicker)
+			end			
 		end
 		
 		-- Create the loaded crate node

nodes/node_power_connector.lua

@@ -0,0 +1,69 @@
+-- internationalization boilerplate
+local MP = minetest.get_modpath(minetest.get_current_modname())
+local S, NS = dofile(MP.."/intllib.lua")
+
+local size = 3/16
+
+local max_dig_cost = math.max(digtron.config.dig_cost_cracky, digtron.config.dig_cost_crumbly, digtron.config.dig_cost_choppy, digtron.config.dig_cost_default)
+
+minetest.register_node("digtron:power_connector", {
+	description = S("DPC"),
+	_doc_items_longdesc = digtron.doc.power_connector_longdesc,
+    _doc_items_usagehelp = digtron.doc.power_connector_usagehelp,
+	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 8, technic_machine=1, technic_hv=1},
+	tiles = {"digtron_plate.png"},
+	connect_sides = {"bottom", "top", "left", "right", "front", "back"},
+	drawtype = "nodebox",
+	sounds = digtron.metal_sounds,
+	paramtype = "light",
+	paramtype2 = "facedir",
+	is_ground_content = false,
+--	node_box = {
+--		type = "fixed",
+--		fixed = {
+--			{-0.5, 0.5, -0.5, 0.5, 0, 0.5}, -- NodeBox1
+--			{-0.1875, 0, -0.1875, 0.1875, -0.5, 0.1875}, -- NodeBox2
+--			{-0.3125, -0.0625, -0.3125, 0.3125, -0.1875, 0.3125}, -- NodeBox3
+--			{-0.3125, -0.25, -0.3125, 0.3125, -0.375, 0.3125}, -- NodeBox4
+--		}
+--	},
+	
+	connects_to = {"group:technic_hv_cable"},
+	node_box = {
+		type = "connected",
+		fixed          = {
+			{-0.5, -0.5, -0.5, 0.5, 0, 0.5}, -- NodeBox1
+			{-0.1875, 0, -0.1875, 0.1875, 0.5, 0.1875}, -- NodeBox2
+			{-0.3125, 0.0625, -0.3125, 0.3125, 0.1875, 0.3125}, -- NodeBox3
+			{-0.3125, 0.25, -0.3125, 0.3125, 0.375, 0.3125}, -- NodeBox4
+		},
+		connect_front  = {-size, -size, -0.5,  size,  size, size}, -- z-
+		connect_back   = {-size, -size,  size, size,  size, 0.5 }, -- z+
+		connect_left   = {-0.5,  -size, -size, size,  size, size}, -- x-
+		connect_right  = {-size, -size, -size, 0.5,   size, size}, -- x+
+	},
+	
+	technic_run = function(pos, node)
+		local meta = minetest.get_meta(pos)
+		local eu_input = meta:get_int("HV_EU_input")
+		local demand = meta:get_int("HV_EU_demand")
+		meta:set_string("infotext", S("Digtron Power @1/@2\nRight-click to update", eu_input, demand))
+	end,
+	
+	on_rightclick = function(pos, node, player, itemstack, pointed_thing)
+		local layout = DigtronLayout.create(pos, player)
+		local max_cost = 0
+		for _, node_image in pairs(layout.builders) do
+			max_cost = max_cost + digtron.config.build_cost
+		end 
+		for _, node_image in pairs(layout.diggers) do
+			max_cost = max_cost + max_dig_cost
+		end
+		local meta = minetest.get_meta(pos)
+		meta:set_int("HV_EU_demand", max_cost * digtron.config.power_ratio)		
+	end,
+
+})
+
+
+technic.register_machine("HV", "digtron:power_connector", technic.receiver)

util_execute_cycle.lua

@@ -208,9 +208,24 @@ digtron.execute_dig_cycle = function(pos, clicker)
 	local test_fuel_needed = test_build_fuel_cost + digging_fuel_cost - fuel_burning
 	local test_fuel_burned = 0
 
-	if test_fuel_needed > 0 then
+	local power_from_cables = 0
+	if minetest.get_modpath("technic") then
+		local power_inputs = {}
+		for _, power_connector in pairs(layout.power_connectors) do
+			if power_connector.meta.fields.HV_network and power_connector.meta.fields.HV_EU_input then
+				power_inputs[power_connector.meta.fields.HV_network] = tonumber(power_connector.meta.fields.HV_EU_input)
+			end
+		end
+		for _, power in pairs(power_inputs) do
+			power_from_cables = power_from_cables + power
+		end
+		power_from_cables = power_from_cables / digtron.config.power_ratio
+		test_fuel_burned = power_from_cables
+		
+		if test_fuel_needed - test_fuel_burned > 0 then
 			-- check for the available electrical power
-	      test_fuel_burned = digtron.tap_batteries(layout.battery_holders, test_fuel_needed, true)
+			test_fuel_burned = test_fuel_burned + digtron.tap_batteries(layout.battery_holders, test_fuel_needed, true)
+		end
 	end
 	if (test_fuel_needed < test_fuel_burned) then
 		exhaust = 0 -- all power needs met by electricity, don't blow smoke
@@ -313,10 +328,12 @@ digtron.execute_dig_cycle = function(pos, clicker)
 		status_text = S("Digtron unexpectedly failed to execute one or more build operations, likely due to an inventory error.") .. "\n"
 	end
 	
+	local total_fuel_cost = math.max(digging_fuel_cost + building_fuel_cost - power_from_cables, 0)
+	
 	-- actually burn the fuel needed
-	fuel_burning = fuel_burning - digging_fuel_cost
+	fuel_burning = fuel_burning - total_fuel_cost
 	if digtron.config.particle_effects and exhaust == 1 then
-		table.insert(particle_systems, burn_smoke(pos, digging_fuel_cost))
+		table.insert(particle_systems, burn_smoke(pos, total_fuel_cost))
 	end
 	if fuel_burning < 0 then
 		-- we tap into the batteries either way