Implemented digiline support for spacecannon (new commands are 'get' and 'fire').

cannon.lua

@@ -111,6 +111,17 @@ local register_spacecannon = function(def)
 		connects_to = {"group:technic_hv_cable"},
 		connect_sides = {"bottom", "top", "left", "right", "front", "back"},
 
+		digiline = {
+			receptor = {
+				rules = spacecannon.digiline_rules,
+				action = function() end
+			},
+			effector = {
+				rules = spacecannon.digiline_rules,
+				action = spacecannon.digiline_effector
+			},
+		},
+
 		after_place_node = function(pos, placer)
 			local meta = minetest.get_meta(pos)
 			meta:set_string("owner", placer:get_player_name() or "")
@@ -123,6 +134,9 @@ local register_spacecannon = function(def)
 			meta:set_int("HV_EU_input", 0)
 			meta:set_int("HV_EU_demand", 0)
 
+			-- Set default digiline channel (do before updating formspec).
+			meta:set_string("channel", "spacecannon")
+
 			spacecannon.update_formspec(meta)
 		end,
 
@@ -146,9 +160,17 @@ local register_spacecannon = function(def)
 		end,
 
 		on_receive_fields = function(pos, formname, fields, sender)
+			local meta = minetest.get_meta(pos)
+
 			if fields.fire then
 				spacecannon.fire(pos, def.color, def.speed, def.range)
 			end
+
+			if fields.set_digiline_channel and fields.digiline_channel then
+				meta:set_string("channel", fields.digiline_channel)
+			end
+
+			spacecannon.update_formspec(meta)
 		end
 
 	})

depends.txt

@@ -1,3 +1,4 @@
 default
 technic
+digilines?
 mesecons?

digiline.lua

@@ -0,0 +1,82 @@
+spacecannon.digiline_rules = {
+	-- digilines.rules.default
+	{x= 1,y= 0,z= 0},{x=-1,y= 0,z= 0}, -- along x beside
+	{x= 0,y= 0,z= 1},{x= 0,y= 0,z=-1}, -- along z beside
+	{x= 1,y= 1,z= 0},{x=-1,y= 1,z= 0}, -- 1 node above along x diagonal
+	{x= 0,y= 1,z= 1},{x= 0,y= 1,z=-1}, -- 1 node above along z diagonal
+	{x= 1,y=-1,z= 0},{x=-1,y=-1,z= 0}, -- 1 node below along x diagonal
+	{x= 0,y=-1,z= 1},{x= 0,y=-1,z=-1}, -- 1 node below along z diagonal
+	-- added rules for digi cable
+	{x= 0,y= 1,z= 0},{x= 0,y=-1,z= 0}, -- along y above and below
+}
+
+spacecannon.digiline_handler_get = function(pos, node, channel, msg)
+	local meta = minetest.get_meta(pos)
+
+	local input = meta:get_int("HV_EU_input")
+	local demand = meta:get_int("HV_EU_demand")
+	local powerstorage = meta:get_int("powerstorage")
+
+	local resp = {
+		ready = (demand == 0) and (powerstorage > 0),
+		HV_EU_input = input,
+		HV_EU_demand = demand,
+		powerstorage = powerstorage,
+		dir = spacecannon.facedir_to_down_dir(node.param2),
+		name = node.name,
+		origin = channel,
+		pos = pos
+	}
+
+	digilines.receptor_send(pos, spacecannon.digiline_rules, channel, resp)
+end
+
+spacecannon.digiline_handler_fire = function(pos, node, channel, msg)
+	local meta = minetest.get_meta(pos)
+
+	-- TODO: Add ability to set "target node" in the msg, and if its within
+	-- 45 degree angle of where the cannon is aimed, then allow the projectile
+	-- to travel at a suitable angle to pass through the target node.
+
+	-- TODO: Modify "spacecannon.fire" to return success/failure, so we can
+	-- return that to the digiline receptor.
+	-- For now, if we've consumed powerstorage, then assume success.
+	local powerstorage_before = meta:get_int("powerstorage")
+
+	-- We cannot directly call "spacecannon.fire", as we don't know the
+	-- cannon's registered color, speed and range; we'll trampoline through
+	-- the mesecons effector.
+	local mesecons = minetest.registered_nodes[node.name]['mesecons']
+	if mesecons then
+		mesecons.effector.action_on(pos, node)
+	end
+
+	local powerstorage_after = meta:get_int("powerstorage")
+
+	local resp = {
+		action = "fire",
+		success = (powerstorage_before > 0) and (powerstorage_after == 0),
+		origin = channel,
+		pos = pos
+	}
+
+	digilines.receptor_send(pos, spacecannon.digiline_rules, channel, resp)
+end
+
+spacecannon.digiline_effector = function(pos, node, channel, msg)
+	if type(msg) ~= "table" then
+		return
+	end
+
+	local meta = minetest.get_meta(pos)
+
+	if channel ~= meta:get_string("channel") then
+		return
+	end
+
+	if msg.command == "get" then
+		spacecannon.digiline_handler_get(pos, node, channel, msg)
+	elseif msg.command == "fire" then
+		spacecannon.digiline_handler_fire(pos, node, channel, msg)
+	end
+end

init.lua

@@ -13,7 +13,8 @@ spacecannon = {
 local MP = minetest.get_modpath("spacecannon")
 
 dofile(MP.."/util.lua")
+dofile(MP.."/digiline.lua")
 dofile(MP.."/cannon.lua")
 dofile(MP.."/node_resilience.lua")
 
-print("[OK] Spacecannon")
+print("[OK] Spacecannon")

util.lua

@@ -1,7 +1,30 @@
+local has_digilines = minetest.get_modpath("digilines")
+
+spacecannon.update_formspec_digilines = function(meta)
+	local channel = meta:get_string("channel") or ""
+
+	local formspec =
+		"formspec_version[4]" ..
+		"size[6,4;]" ..
+
+		-- Digiline channel
+		"field[0.5,0.5;3.5,1;digiline_channel;Digiline Channel;" ..
+		channel .. "]" ..
+		"button_exit[4.5,0.5;1,1;set_digiline_channel;Set]" ..
+
+		-- Manual "fire" button
+		"button_exit[0.5,2.5;5,1;fire;Fire]"
+
+	meta:set_string("formspec", formspec)
+end
 
 spacecannon.update_formspec = function(meta)
-	meta:set_string("formspec", "size[8,2;]" ..
+	if has_digilines then
-		"button_exit[0,1;8,1;fire;Fire]")
+		spacecannon.update_formspec_digilines(meta)
+	else
+		meta:set_string("formspec", "size[8,2;]" ..
+			"button_exit[0,1;8,1;fire;Fire]")
+	end
 end
 
 spacecannon.can_shoot = function(pos)