If digilines is enabled, create digiline conducting copies of all

registered pole nodes, with simple texture overlays to make it evident.

Also, create suitable spawners for these, but only if the light source
to be spawned is also digilines compatible.

When using a digiline-compat spawner, you can set the channel for the
light source (and thus all future lights you place) by shift-punching
while wielding the spawner.  This setting persists until the next
restart, or until you change it with another shift-punch.

depends.txt

@@ -6,3 +6,4 @@ gloopblocks?
 homedecor_fences?
 homedecor_lighting?
 streetspoles?
+digilines?

simple.lua

@@ -1,4 +1,3 @@
-
 local fdir_to_right = {
 	{  1,  0 },
 	{  0, -1 },
@@ -6,16 +5,72 @@ local fdir_to_right = {
 	{  0,  1 }
 }
 
+--digilines compatibility
+
+local rules_alldir = {
+	{x =  0, y =  0, z = -1},  -- borrowed from lightstones
+	{x =  1, y =  0, z =  0},
+	{x = -1, y =  0, z =  0},
+	{x =  0, y =  0, z =  1},
+	{x =  1, y =  1, z =  0},
+	{x =  1, y = -1, z =  0},
+	{x = -1, y =  1, z =  0},
+	{x = -1, y = -1, z =  0},
+	{x =  0, y =  1, z =  1},
+	{x =  0, y = -1, z =  1},
+	{x =  0, y =  1, z = -1},
+	{x =  0, y = -1, z = -1},
+	{x =  0, y = -1, z =  0},
+}
+
+local enable_digilines = minetest.get_modpath("digilines")
+
+ilights.player_channels = {} -- last light source channel name that was set by a given player
+
+if enable_digilines then
+
+	minetest.register_on_player_receive_fields(function(player, formname, fields)
+		if not player then return end
+		if fields.channel and fields.channel ~= "" and formname == "simple_streetlights:set_channel" then
+			local playername = player:get_player_name()
+			minetest.chat_send_player(playername, "*** The light source on all streetlights placed from now on will have the channel set to \""..fields.channel.."\"")
+			ilights.player_channels[playername] = fields.channel
+		end
+	end)
+
+	function ilights.digiline_on_use(itemstack, user, pointed_thing)
+		if user and user:get_player_control().sneak then
+			local name = user:get_player_name()
+			local form = "field[channel;Set a channel for future streetlights;]"
+			minetest.show_formspec(name, "simple_streetlights:set_channel", form)
+		end
+	end
+end
+
+local digiline_wire_node = "digilines:wire_std_00000000"
+
+-- clone node
+
+local function clone_node(name)
+	local node2 = {}
+	local node = minetest.registered_nodes[name]
+	for k,v in pairs(node) do
+		node2[k]=v
+	end
+	return node2
+end
+
 minetest.register_privilege("streetlight", {
 	description = "Allows using streetlight spawners",
 	give_to_singleplayer = true
 })
 
-local function check_and_place(itemstack, placer, pointed_thing, pole, light, param2)
+local function check_and_place(itemstack, placer, pointed_thing, pole, light, param2, needs_digiline_wire)
 	local sneak = placer:get_player_control().sneak
 	if not placer then return end
+	local playername = placer:get_player_name()
 	if not minetest.check_player_privs(placer, "streetlight") then
-		minetest.chat_send_player(placer:get_player_name(), "*** You don't have permission to use a streetlight spawner.")
+		minetest.chat_send_player(playername, "*** You don't have permission to use a streetlight spawner.")
 		return
 	end
 	local player_name = placer:get_player_name()
@@ -63,18 +118,23 @@ local function check_and_place(itemstack, placer, pointed_thing, pole, light, pa
 	if not creative.is_enabled_for(player_name) then
 		local inv = placer:get_inventory()
 		if not inv:contains_item("main", pole.." 6") then
-			minetest.chat_send_player(placer:get_player_name(), "*** You don't have enough "..pole.." in your inventory!")
+			minetest.chat_send_player(playername, "*** You don't have enough "..pole.." in your inventory!")
 			return
 		end
 
 		if not inv:contains_item("main", light) then
-			minetest.chat_send_player(placer:get_player_name(), "*** You don't have any "..light.." in your inventory!")
+			minetest.chat_send_player(playername, "*** You don't have any "..light.." in your inventory!")
+			return
+		end
+
+		if needs_digiline_wire and not inv:contains_item("main", digiline_wire_node) then
+			minetest.chat_send_player(playername, "*** You don't have any digiline wires in your inventory!")
 			return
 		end
 
 		if sneak then
 			if not inv:contains_item("main", streetlights.concrete) then
-				minetest.chat_send_player(placer:get_player_name(), "*** You don't have any concrete in your inventory!")
+				minetest.chat_send_player(playername, "*** You don't have any concrete in your inventory!")
 				return
 			else
 				inv:remove_item("main", streetlights.concrete)
@@ -83,6 +143,7 @@ local function check_and_place(itemstack, placer, pointed_thing, pole, light, pa
 
 		inv:remove_item("main", pole.." 6")
 		inv:remove_item("main", light)
+		inv:remove_item("main", digiline_wire_node)
 
 	end
 
@@ -96,6 +157,10 @@ local function check_and_place(itemstack, placer, pointed_thing, pole, light, pa
 	end
 	minetest.set_node(pos3, { name = pole    })
 	minetest.set_node(pos4, { name = light, param2 = param2 })
+
+	if needs_digiline_wire and ilights.player_channels[playername] then
+		minetest.get_meta(pos4):set_string("channel", ilights.player_channels[playername])
+	end
 end
 
 local poles_tab = {
@@ -127,6 +192,36 @@ for _, pole in ipairs(poles_tab) do
 			local lightnode =   light[3]
 			local lightparam2 = light[4] or 0
 
+			if enable_digilines then
+				local def = clone_node(matnode)
+				local dl_overlay
+
+				if def.drawtype == "fencelike" then
+					dl_overlay = "simple_streetlights_pole_digiline_overlay_fl.png"
+				else
+					dl_overlay = "simple_streetlights_pole_digiline_overlay_cnb.png"
+				end
+
+				for i,t in ipairs(def.tiles) do
+					def.tiles[i] = t.."^"..dl_overlay
+				end
+				def.description = def.description.." (digilines conducting)"
+				def.digiline = {
+					wire = {
+						rules = {
+							{x= 0, y= 0, z=-1},
+							{x= 0, y= 0, z= 1},
+							{x= 1, y= 0, z= 0},
+							{x=-1, y= 0, z= 0},
+							{x= 0, y=-1, z= 0},
+							{x= 0, y= 1, z= 0},
+							{x= 0, y=-2, z= 0}
+						}
+					}
+				}
+				minetest.register_node(":"..matnode.."_digilines", def)
+			end
+
 			if minetest.get_modpath(lightmod) then
 
 				minetest.register_tool("simple_streetlights:spawner_"..matname.."_"..lightname, {
@@ -154,6 +249,35 @@ for _, pole in ipairs(poles_tab) do
 					}
 				})
 
+				if enable_digilines and minetest.registered_nodes[lightnode].digiline then
+					minetest.register_tool("simple_streetlights:spawner_"..matname.."_"..lightname.."_digilines", {
+						description = "Streetlight spawner ("..matname.." pole, with "..lightname..", digilines conducting pole)",
+						inventory_image = "simple_streetlights_inv_pole_"..matname..".png"..
+										  "^simple_streetlights_inv_pole_digiline_overlay.png"..
+										  "^simple_streetlights_inv_light_source_"..lightname..".png",
+						use_texture_alpha = true,
+						tool_capabilities = { full_punch_interval=0.1 },
+						on_place = function(itemstack, placer, pointed_thing)
+							check_and_place(itemstack, placer, pointed_thing, matnode.."_digilines", lightnode, lightparam2, true)
+						end,
+						on_use = ilights.digiline_on_use
+					})
+
+					minetest.register_craft({
+						output = "simple_streetlights:spawner_"..matname.."_"..lightname.."_digilines",
+						type = "shapeless",
+						recipe = {
+							matnode,
+							matnode,
+							matnode,
+							matnode,
+							matnode,
+							matnode,
+							lightnode,
+							digiline_wire_node,
+						}
+					})
+				end
 			end
 		end
 	end