From 6fd845baec0f5aa8b7cdee1adf8d05061a643242 Mon Sep 17 00:00:00 2001
From: orwell <orwell@bleipb.de>
Date: Thu, 23 May 2024 00:58:24 +0200
Subject: Connect the ropes, start on making the UI work

---
 advtrains_interlocking/database.lua                |   2 +-
 advtrains_interlocking/distant.lua                 | 200 -----------
 advtrains_interlocking/init.lua                    |   3 -
 advtrains_interlocking/route_ui.lua                |  18 +-
 advtrains_interlocking/routesetting.lua            |  15 +-
 advtrains_interlocking/signal_api.lua              | 220 +++----------
 advtrains_interlocking/signal_aspect_accessors.lua | 163 ---------
 advtrains_interlocking/signal_aspect_ui.lua        | 366 ++++++++-------------
 advtrains_interlocking/tcb_ts_ui.lua               |  11 +-
 9 files changed, 207 insertions(+), 791 deletions(-)
 delete mode 100644 advtrains_interlocking/distant.lua
 delete mode 100644 advtrains_interlocking/signal_aspect_accessors.lua

(limited to 'advtrains_interlocking')

diff --git a/advtrains_interlocking/database.lua b/advtrains_interlocking/database.lua
index 4213c3d..e2df547 100644
--- a/advtrains_interlocking/database.lua
+++ b/advtrains_interlocking/database.lua
@@ -1006,7 +1006,7 @@ end
 function ildb.get_ip_signal_asp(pts, connid)
 	local p = ildb.get_ip_signal(pts, connid)
 	if p then
-		local asp = advtrains.interlocking.signal_get_aspect(p)
+		local asp = advtrains.interlocking.signal.get_aspect(p)
 		if not asp then
 			atlog("Clearing orphaned signal influence point", pts, "/", connid)
 			ildb.clear_ip_signal(pts, connid)
diff --git a/advtrains_interlocking/distant.lua b/advtrains_interlocking/distant.lua
deleted file mode 100644
index 32ada82..0000000
--- a/advtrains_interlocking/distant.lua
+++ /dev/null
@@ -1,200 +0,0 @@
---- Distant signaling.
--- This module implements a database backend for distant signal assignments.
--- The actual modifications to signal aspects are still done by signal aspect accessors.
--- @module advtrains.interlocking.distant
-
-local db_distant = {}
-local db_distant_of = {}
-
-local pts = advtrains.encode_pos
-local stp = advtrains.decode_pos
-
---- Replace the distant signal assignment database.
--- @function load
--- @param db The new database to load.
-local function db_load(x)
-	if type(x) ~= "table" then
-		return
-	end
-	db_distant = x.distant
-	db_distant_of = x.distant_of
-end
-
---- Retrieve the current distant signal assignment database.
--- @function save
--- @return The current database.
-local function db_save()
-	return {
-		distant = db_distant,
-		distant_of = db_distant_of,
-	}
-end
-
-local update_signal, update_main, update_dst
-
---- Unassign a distant signal.
--- @function unassign_dst
--- @param dst The position of the distant signal.
--- @param[opt=false] force Whether to skip callbacks.
-local function unassign_dst(dst, force)
-	local pts_dst = pts(dst)
-	local main = db_distant_of[pts_dst]
-	db_distant_of[pts_dst] = nil
-	if main then
-		local pts_main = main[1]
-		local t = db_distant[pts_main]
-		if t then
-			t[pts_dst] = nil
-		end
-	end
-	if not force then
-		update_dst(dst)
-	end
-end
-
---- Unassign a main signal.
--- @function unassign_main
--- @param main The position of the main signal.
--- @param[opt=false] force Whether to skip callbacks.
-local function unassign_main(main, force)
-	local pts_main = pts(main)
-	local t = db_distant[pts_main]
-	if not t then
-		return
-	end
-	for pts_dst in pairs(t) do
-		local realmain = db_distant_of[pts_dst]
-		if realmain and realmain[1] == pts_main then
-			db_distant_of[pts_dst] = nil
-			if not force then
-				local dst = stp(pts_dst)
-				update_dst(dst)
-			end
-		end
-	end
-	db_distant[pts_main] = nil
-end
-
---- Remove all (main and distant) signal assignments from a signal.
--- @function unassign_all
--- @param pos The position of the signal.
--- @param[opt=false] force Whether to skip callbacks.
-local function unassign_all(pos, force)
-	unassign_main(pos)
-	unassign_dst(pos, force)
-end
-
---- Check whether a signal is "appropriate" for the distant signal system.
--- Currently, a signal is considered appropriate if its signal aspect can be set.
--- @function appropriate_signal
--- @param pos The position of the signal
-local function appropriate_signal(pos)
-	local node = advtrains.ndb.get_node(pos)
-	local ndef = minetest.registered_nodes[node.name] or {}
-	if not ndef then
-		return false
-	end
-	local atdef = ndef.advtrains
-	if not atdef then
-		return false
-	end
-	return atdef.supported_aspects and atdef.set_aspect and true
-end
-
---- Assign a distant signal to a main signal.
--- @function assign
--- @param main The position of the main signal.
--- @param dst The position of the distant signal.
--- @param[opt="manual"] by The method of assignment.
--- @param[opt=false] skip_update Whether to skip callbacks.
-local function assign(main, dst, by, skip_update)
-	if not (appropriate_signal(main) and appropriate_signal(dst)) then
-		return
-	end
-	local pts_main = pts(main)
-	local pts_dst = pts(dst)
-	local t = db_distant[pts_main]
-	if not t then
-		t = {}
-		db_distant[pts_main] = t
-	end
-	if not by then
-		by = "manual"
-	end
-	unassign_dst(dst, true)
-	t[pts_dst] = by
-	db_distant_of[pts_dst] = {pts_main, by}
-	if not skip_update then
-		update_dst(dst)
-	end
-end
-
---- Get the distant signals assigned to a main signal.
--- @function get_distant
--- @param main The position of the main signal.
--- @treturn {[pos]=by,...} A table of distant signals, with the positions encoded using `advtrains.encode_pos`.
-local function get_distant(main)
-	local pts_main = pts(main)
-	return db_distant[pts_main] or {}
-end
-
---- Get the main signal assigned the a distant signal.
--- @function get_main
--- @param dst The position of the distant signal.
--- @return The position of the main signal.
--- @return The method of assignment.
-local function get_main(dst)
-	local pts_dst = pts(dst)
-	local main = db_distant_of[pts_dst]
-	if not main then
-		return
-	end
-	if main[1] then
-		return stp(main[1]), unpack(main, 2)
-	else
-		return unpack(main)
-	end
-end
-
---- Update all distant signals assigned to a main signal.
--- @function update_main
--- @param main The position of the main signal.
-update_main = function(main)
-	local pts_main = pts(main)
-	local t = get_distant(main)
-	for pts_dst in pairs(t) do
-		local dst = stp(pts_dst)
-		advtrains.interlocking.signal_readjust_aspect(dst)
-	end
-end
-
---- Update the aspect of a distant signal.
--- @function update_dst
--- @param dst The position of the distant signal.
-update_dst = function(dst)
-	advtrains.interlocking.signal_readjust_aspect(dst)
-end
-
---- Update the aspect of a combined (main and distant) signal and all distant signals assigned to it.
--- @function update_signal
--- @param pos The position of the signal.
-update_signal = function(pos)
-	update_main(pos)
-	update_dst(pos)
-end
-
-advtrains.distant = {
-	load = db_load,
-	save = db_save,
-	assign = assign,
-	unassign_dst = unassign_dst,
-	unassign_main = unassign_main,
-	unassign_all = unassign_all,
-	get_distant = get_distant,
-	get_dst = get_distant,
-	get_main = get_main,
-	update_main = update_main,
-	update_dst = update_dst,
-	update_signal = update_signal,
-	appropriate_signal = appropriate_signal,
-}
diff --git a/advtrains_interlocking/init.lua b/advtrains_interlocking/init.lua
index dd08b4a..c397aa6 100644
--- a/advtrains_interlocking/init.lua
+++ b/advtrains_interlocking/init.lua
@@ -15,9 +15,6 @@ local modpath = minetest.get_modpath(minetest.get_current_modname()) .. DIR_DELI
 --advtrains.interlocking.aspect = dofile(modpath.."aspect.lua")
 
 dofile(modpath.."database.lua")
-dofile(modpath.."distant.lua")
-dofile(modpath.."distant_ui.lua")
-dofile(modpath.."signal_aspect_accessors.lua")
 dofile(modpath.."signal_api.lua")
 dofile(modpath.."signal_aspect_ui.lua")
 dofile(modpath.."demosignals.lua")
diff --git a/advtrains_interlocking/route_ui.lua b/advtrains_interlocking/route_ui.lua
index a1a331d..982c579 100644
--- a/advtrains_interlocking/route_ui.lua
+++ b/advtrains_interlocking/route_ui.lua
@@ -33,7 +33,7 @@ function atil.show_route_edit_form(pname, sigd, routeid)
 	local function itab(t)
 		tab[#tab+1] = minetest.formspec_escape(string.gsub(t, ",", " "))
 	end
-	itab("TCB "..sigd_to_string(sigd).." ("..(tcbs.signal_name or "")..") Route #"..routeid)
+	itab("("..(tcbs.signal_name or "+")..") Route #"..routeid)
 	
 	-- this code is partially copy-pasted from routesetting.lua
 	-- we start at the tc designated by signal
@@ -56,13 +56,14 @@ function atil.show_route_edit_form(pname, sigd, routeid)
 		c_rseg = route[i]
 		c_lckp = {}
 		
-		itab(""..i.." Entry "..sigd_to_string(c_sigd).." -> Sec. "..(c_ts and c_ts.name or "-").." -> Exit "..(c_rseg.next and sigd_to_string(c_rseg.next) or "END"))
+		itab(""..i.." "..sigd_to_string(c_sigd))
+		itab("= "..(c_ts and c_ts.name or "-").." =")
 		
 		if c_rseg.locks then
 			for pts, state in pairs(c_rseg.locks) do
 				
 				local pos = minetest.string_to_pos(pts)
-				itab("  Lock: "..pts.." -> "..state)
+				itab("L "..pts.." -> "..state)
 				if not advtrains.is_passive(pos) then
 					itab("-!- No passive component at "..pts..". Please reconfigure route!")
 					break
@@ -75,16 +76,17 @@ function atil.show_route_edit_form(pname, sigd, routeid)
 	end
 	if c_sigd then
 		local e_tcbs = ildb.get_tcbs(c_sigd)
-		itab("Route end: "..sigd_to_string(c_sigd).." ("..(e_tcbs and e_tcbs.signal_name or "-")..")")
+		local signame = "-"
+		if e_tcbs and e_tcbs.signal then signame = e_tcbs.signal_name or "+" end
+		itab("E "..sigd_to_string(c_sigd).." ("..signame..")")
 	else
-		itab("Route ends on dead-end")
+		itab("E (none)")
 	end
 	
-	form = form.."textlist[0.5,2;7.75,3.9;rtelog;"..table.concat(tab, ",").."]"
+	form = form.."textlist[0.5,2;3,3.9;rtelog;"..table.concat(tab, ",").."]"
 	
 	form = form.."button[0.5,6;3,1;back;<<< Back to signal]"
-	form = form.."button[4.5,6;2,1;aspect;Signal Aspect]"
-	form = form.."button[6.5,6;2,1;delete;Delete Route]"
+	form = form.."button[5.5,6;3,1;delete;Delete Route]"
 	
 	--atdebug(route.ars)
 	form = form.."style[ars;font=mono]"
diff --git a/advtrains_interlocking/routesetting.lua b/advtrains_interlocking/routesetting.lua
index 24b3199..a576139 100644
--- a/advtrains_interlocking/routesetting.lua
+++ b/advtrains_interlocking/routesetting.lua
@@ -138,7 +138,7 @@ function ilrs.set_route(signal, route, try)
 			}
 			if c_tcbs.signal then
 				c_tcbs.route_committed = true
-				c_tcbs.aspect = route.aspect or advtrains.interlocking.FULL_FREE
+				c_tcbs.aspect = advtrains.interlocking.signal.MASP_FREE
 				c_tcbs.route_origin = signal
 				signals[#signals+1] = c_tcbs
 			end
@@ -166,7 +166,7 @@ function ilrs.set_route(signal, route, try)
 			if (not nodst) and (not assigned_by or assigned_by == "routesetting") then
 				advtrains.distant.assign(lastsig, pos, "routesetting", true)
 			end
-			advtrains.interlocking.update_signal_aspect(tcbs, i ~= 1)
+			advtrains.interlocking.signal.update_route_aspect(tcbs, i ~= 1)
 		end
 	end
 	
@@ -278,14 +278,7 @@ function ilrs.cancel_route_from(sigd)
 		c_tcbs.route_auto = nil
 		c_tcbs.route_origin = nil
 		
-		if c_tcbs.signal then
-			local pos = c_tcbs.signal
-			local _, assigned_by = advtrains.distant.get_main(pos)
-			if assigned_by == "routesetting" then
-				advtrains.distant.unassign_dst(pos, true)
-			end
-		end
-		advtrains.interlocking.update_signal_aspect(c_tcbs)
+		advtrains.interlocking.signal.update_route_aspect(c_tcbs)
 		
 		c_ts_id = c_tcbs.ts_id
 		if not c_tcbs then
@@ -370,7 +363,7 @@ function ilrs.update_route(sigd, tcbs, newrte, cancel)
 	end
 	if has_changed_aspect then
 		-- FIX: prevent an minetest.after() loop caused by update_signal_aspect dispatching path invalidation, which in turn calls ARS again
-		advtrains.interlocking.update_signal_aspect(tcbs)
+		advtrains.interlocking.signal.update_route_aspect(tcbs)
 	end
 	advtrains.interlocking.update_player_forms(sigd)
 end
diff --git a/advtrains_interlocking/signal_api.lua b/advtrains_interlocking/signal_api.lua
index d27a045..5216594 100644
--- a/advtrains_interlocking/signal_api.lua
+++ b/advtrains_interlocking/signal_api.lua
@@ -5,9 +5,15 @@ local F = advtrains.formspec
 local signal = {}
 
 signal.MASP_HALT = {
-	name = "halt",
-	description = "HALT",
-	halt = true,
+	name = nil,
+	speed = nil,
+	remote = nil,
+}
+
+signal.MASP_FREE = {
+	name = "_free",
+	speed = -1,
+	remote = nil,
 }
 
 signal.ASPI_HALT = {
@@ -50,11 +56,12 @@ Note that once apply_aspect returns, there is no need for advtrains anymore to q
 When the signal, for any reason, wants to change its aspect by itself *without* going through the signal API then
 it should update the aspect info cache by calling advtrains.interlocking.signal.update_aspect_info(pos)
 
-Note that the apply_aspect function MUST accept the following main aspect, even if it is not defined in the main_aspects table:
-{ name = "halt", halt = true }
-It should cause the signal to show its most restrictive aspect. Typically it is a halt aspect, but e.g. for distant-only
+Apply_aspect may also receive nil as the main aspect. It usually means that the signal is not assigned to anything particular,
+and it should cause the signal to show its most restrictive aspect. Typically it is a halt aspect, but e.g. for distant-only
 signals this would be "expect stop".
 
+Main aspect names starting with underscore (e.g. "_default") are reserved and must not be used!
+
 == Aspect Info ==
 The actual signal aspect in the already-known format. This is what the trains use to determine halt/proceed and speed.
 asp = {
@@ -152,7 +159,7 @@ end
 -- - Storing the main aspect and dst pos for this signal permanently (until next change)
 -- - Assigning the distant signal for this signal
 -- - Calling apply_aspect() in the signal's node definition to make the signal show the aspect
--- - Calling apply_aspect() again whenever the distant signal changes its aspect
+-- - Calling apply_aspect() again whenever the remote signal changes its aspect
 -- - Notifying this signal's distant signals about changes to this signal (unless skip_dst_notify is specified)
 function signal.set_aspect(pos, main_asp_name, main_asp_speed, rem_pos, skip_dst_notify)
 	local main_pts = advtrains.encode_pos(pos)
@@ -252,10 +259,7 @@ function signal.get_aspect(pos)
 end
 
 local function cache_mainaspects(ndefat)
-	ndefat.main_aspects_lookup = {
-		-- always define halt aspect
-		halt = signal.MASP_HALT
-	}
+	ndefat.main_aspects_lookup = {}
 	for _,ma in ipairs(ndefat.main_aspects) do
 		ndefat.main_aspects_lookup[ma.name] = ma
 	end
@@ -264,7 +268,7 @@ end
 function signal.get_aspect_internal(pos, aspt)
 	if not aspt then
 		-- oh, no main aspect, nevermind
-		return nil, aspt.remote, nil
+		return nil, nil, nil
 	end
 	atdebug("get_aspect_internal",pos,aspt)
 	-- look aspect in nodedef
@@ -277,6 +281,10 @@ function signal.get_aspect_internal(pos, aspt)
 			cache_mainaspects(ndefat)
 		end
 		local masp = ndefat.main_aspects_lookup[aspt.name]
+		-- special handling for the default free aspect ("_free")
+		if aspt.name == "_free" then
+			masp = ndefat.main_aspects[1]
+		end
 		if not masp then
 			atwarn(pos,"invalid main aspect",aspt.name,"valid are",ndefat.main_aspects_lookup)
 			return nil, aspt.remote, node, ndef
@@ -355,10 +363,30 @@ end
 function signal.update_route_aspect(tcbs, skip_dst_notify)
 	if tcbs.signal then
 		local asp = tcbs.aspect or signal.MASP_HALT
-		signal.set_aspect(tcbs.signal, asp, skip_dst_notify)
+		signal.set_aspect(tcbs.signal, asp.name, asp.speed, asp.remote, skip_dst_notify)
 	end
 end
 
+-- Returns how capable the signal is with regards to aspect setting
+-- 0: not a signal at all
+-- 1: signal has get_aspect_info() but the aspect is not variable (e.g. a sign)
+-- 2: signal has apply_aspect() but does not have main aspects (e.g. a pure distant signal)
+-- 3: Full capabilities, signal has main aspects and can be used as main/shunt signal (can be start/endpoint of a route)
+function signal.get_signal_cap_level(pos)
+	local node = advtrains.ndb.get_node_or_nil(pos)
+	local ndef = node and minetest.registered_nodes[node.name]
+	local ndefat = ndef and ndef.advtrains
+	if ndefat and ndefat.get_aspect_info then
+		if ndefat.apply_aspect  then
+			if ndefat.main_aspects then
+				return 3
+			end
+			return 2
+		end
+		return 1
+	end
+	return 0
+end
 
 ----------------
 
@@ -366,7 +394,7 @@ function signal.can_dig(pos)
 	return not advtrains.interlocking.db.get_sigd_for_signal(pos)
 end
 
-function advtrains.interlocking.signal_after_dig(pos)
+function signal.after_dig(pos)
 	-- TODO clear influence point
 	advtrains.interlocking.signal.clear_aspect(pos)
 end
@@ -374,169 +402,7 @@ end
 function signal.on_rightclick(pos, node, player, itemstack, pointed_thing)
 	local pname = player:get_player_name()
 	local control = player:get_player_control()
-	if control.aux1 then
-		advtrains.interlocking.show_ip_form(pos, pname)
-		return
-	end
-	advtrains.interlocking.show_signal_form(pos, node, pname)
-end
-
-function advtrains.interlocking.show_signal_form(pos, node, pname)
-	local sigd = advtrains.interlocking.db.get_sigd_for_signal(pos)
-	if sigd then
-		advtrains.interlocking.show_signalling_form(sigd, pname)
-	else
-		local ndef = minetest.registered_nodes[node.name]
-		if ndef.advtrains and ndef.advtrains.set_aspect then
-			-- permit to set aspect manually
-			local function callback(pname, aspect)
-				signal.set_aspect(pos, aspect)
-			end
-			local isasp = advtrains.interlocking.signal_get_aspect(pos, node)
-
-			advtrains.interlocking.show_signal_aspect_selector(
-				pname,
-				ndef.advtrains.supported_aspects,
-				pos, callback,
-				isasp)
-		else
-			--static signal - only IP
-			advtrains.interlocking.show_ip_form(pos, pname)
-		end
-	end
-end
-
-local players_assign_ip = {}
-
-local function ipmarker(ipos, connid)
-	local node_ok, conns, rhe = advtrains.get_rail_info_at(ipos, advtrains.all_tracktypes)
-	if not node_ok then return end
-	local yaw = advtrains.dir_to_angle(conns[connid].c)
-
-	-- using tcbmarker here
-	local obj = minetest.add_entity(vector.add(ipos, {x=0, y=0.2, z=0}), "advtrains_interlocking:tcbmarker")
-	if not obj then return end
-	obj:set_yaw(yaw)
-	obj:set_properties({
-		textures = { "at_il_signal_ip.png" },
-	})
-end
-
-function advtrains.interlocking.make_ip_formspec_component(pos, x, y, w)
-	advtrains.interlocking.db.check_for_duplicate_ip(pos)
-	local pts, connid = advtrains.interlocking.db.get_ip_by_signalpos(pos)
-	if pts then
-		return table.concat {
-			F.S_label(x, y, "Influence point is set at @1.", string.format("%s/%s", pts, connid)),
-			F.S_button_exit(x, y+0.5, w/2-0.125, "ip_set", "Modify"),
-			F.S_button_exit(x+w/2+0.125, y+0.5, w/2-0.125, "ip_clear", "Clear"),
-		}, pts, connid
-	else
-		return table.concat {
-			F.S_label(x, y, "Influence point is not set."),
-			F.S_button_exit(x, y+0.5, w, "ip_set", "Set influence point"),
-		}
-	end
-end
-
--- shows small info form for signal properties
--- This function is named show_ip_form because it was originally only intended
--- for assigning/changing the influence point.
--- only_notset: show only if it is not set yet (used by signal tcb assignment)
-function advtrains.interlocking.show_ip_form(pos, pname, only_notset)
-	if not minetest.check_player_privs(pname, "interlocking") then
-		return
-	end
-	local ipform, pts, connid = advtrains.interlocking.make_ip_formspec_component(pos, 0.5, 0.5, 7)
-	local form = {
-		"formspec_version[4]",
-		"size[8,2.25]",
-		ipform,
-	}
-	if pts then
-		local ipos = minetest.string_to_pos(pts)
-		ipmarker(ipos, connid)
-	end
-	if advtrains.distant.appropriate_signal(pos) then
-		form[#form+1] = advtrains.interlocking.make_dst_formspec_component(pos, 0.5, 2, 7, 4.25)
-		form[2] = "size[8,6.75]"
-	end
-	form = table.concat(form)
-	if not only_notset or not pts then
-		minetest.show_formspec(pname, "at_il_propassign_"..minetest.pos_to_string(pos), form)
-	end
+	advtrains.interlocking.show_signal_form(pos, node, pname, control.aux1)
 end
 
-function advtrains.interlocking.handle_ip_formspec_fields(pname, pos, fields)
-	if not (pos and minetest.check_player_privs(pname, {train_operator=true, interlocking=true})) then
-		return
-	end
-	if fields.ip_set then
-		advtrains.interlocking.signal_init_ip_assign(pos, pname)
-	elseif fields.ip_clear then
-		advtrains.interlocking.db.clear_ip_by_signalpos(pos)
-	end
-end
-
-minetest.register_on_player_receive_fields(function(player, formname, fields)
-	local pname = player:get_player_name()
-	local pts = string.match(formname, "^at_il_propassign_([^_]+)$")
-	local pos
-	if pts then
-		pos = minetest.string_to_pos(pts)
-	end
-	if pos then
-		advtrains.interlocking.handle_ip_formspec_fields(pname, pos, fields)
-		advtrains.interlocking.handle_dst_formspec_fields(pname, pos, fields)
-	end
-end)
-
--- inits the signal IP assignment process
-function signal.init_ip_assign(pos, pname)
-	if not minetest.check_player_privs(pname, "interlocking") then
-		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
-		return
-	end
-	--remove old IP
-	--advtrains.interlocking.db.clear_ip_by_signalpos(pos)
-	minetest.chat_send_player(pname, "Configuring Signal: Please look in train's driving direction and punch rail to set influence point.")
-	
-	players_assign_ip[pname] = pos
-end
-
-minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
-	local pname = player:get_player_name()
-	if not minetest.check_player_privs(pname, "interlocking") then
-		return
-	end
-	-- IP assignment
-	local signalpos = players_assign_ip[pname]
-	if signalpos then
-		if vector.distance(pos, signalpos)<=50 then
-			local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
-			if node_ok and #conns == 2 then
-				
-				local yaw = player:get_look_horizontal()
-				local plconnid = advtrains.yawToClosestConn(yaw, conns)
-				
-				-- add assignment if not already present.
-				local pts = advtrains.roundfloorpts(pos)
-				if not advtrains.interlocking.db.get_ip_signal_asp(pts, plconnid) then
-					advtrains.interlocking.db.set_ip_signal(pts, plconnid, signalpos)
-					ipmarker(pos, plconnid)
-					minetest.chat_send_player(pname, "Configuring Signal: Successfully set influence point")
-				else
-					minetest.chat_send_player(pname, "Configuring Signal: Influence point of another signal is already present!")
-				end
-			else
-				minetest.chat_send_player(pname, "Configuring Signal: This is not a normal two-connection rail! Aborted.")
-			end
-		else
-			minetest.chat_send_player(pname, "Configuring Signal: Node is too far away. Aborted.")
-		end
-		players_assign_ip[pname] = nil
-	end
-end)
-
-
 advtrains.interlocking.signal = signal
diff --git a/advtrains_interlocking/signal_aspect_accessors.lua b/advtrains_interlocking/signal_aspect_accessors.lua
deleted file mode 100644
index d91df31..0000000
--- a/advtrains_interlocking/signal_aspect_accessors.lua
+++ /dev/null
@@ -1,163 +0,0 @@
---- Signal aspect accessors
--- @module advtrains.interlocking
-
-local A = advtrains.interlocking.aspect
-local D = advtrains.distant
-local I = advtrains.interlocking
-local N = advtrains.ndb
-local pts = advtrains.roundfloorpts
-
-local get_aspect
-
-local supposed_aspects = {}
-
---- Replace the signal aspect cache.
--- @function load_supposed_aspects
--- @param db The new database.
-function I.load_supposed_aspects(tbl)
-	if tbl then
-		supposed_aspects = {}
-		for k, v in pairs(tbl) do
-			supposed_aspects[k] = A(v)
-		end
-	end
-end
-
---- Retrieve the signal aspect cache.
--- @function save_supposed_aspects
--- @return The current database in use.
-function I.save_supposed_aspects()
-	local t = {}
-	for k, v in pairs(supposed_aspects) do
-		t[k] = v:plain(true)
-	end
-	return t
-end
-
---- Read the aspect of a signal strictly from cache.
--- @param pos The position of the signal.
--- @return[1] The aspect of the signal (if present in cache).
--- @return[2] The nil constant (otherwise).
-local function get_supposed_aspect(pos)
-	return supposed_aspects[pts(pos)]
-end
-
---- Update the signal aspect information in cache.
--- @param pos The position of the signal.
--- @param asp The new signal aspect
-local function set_supposed_aspect(pos, asp)
-	supposed_aspects[pts(pos)] = asp
-end
-
---- Get the definition of a node.
--- @param pos The position of the node.
--- @return[1] The definition of the node (if present).
--- @return[2] An empty table (otherwise).
-local function get_ndef(pos)
-	local node = N.get_node(pos)
-	return (minetest.registered_nodes[node.name] or {}), node
-end
-
---- Get the aspects supported by a signal.
--- @function signal_get_supported_aspects
--- @param pos The position of the signal.
--- @return[1] The table of supported aspects (if present).
--- @return[2] The nil constant (otherwise).
-local function get_supported_aspects(pos)
-	local ndef = get_ndef(pos)
-	if ndef.advtrains and ndef.advtrains.supported_aspects then
-		return ndef.advtrains.supported_aspects
-	end
-	return nil
-end
-
---- Adjust a new signal aspect to fit a signal.
--- @param pos The position of the signal.
--- @param asp The new signal aspect.
--- @return The adjusted signal aspect.
--- @return The information to pass to the `advtrains.set_aspect` field in the node definitions.
-local function adjust_aspect(pos, asp)
-	local asp = A(asp)
-
-	local mainpos = D.get_main(pos)
-	local nxtasp
-	if mainpos then
-		nxtasp = get_aspect(mainpos)
-	end
-	local suppasp = get_supported_aspects(pos)
-	if not suppasp then
-		return asp
-	end
-	return asp:adjust_distant(nxtasp, suppasp.dst_shift):to_group(suppasp.group)
-end
-
---- Get the aspect of a signal without accessing the cache.
--- For most cases, `get_aspect` should be used instead.
--- @function signal_get_real_aspect
--- @param pos The position of the signal.
--- @return[1] The signal aspect adjusted using `adjust_aspect` (if present).
--- @return[2] The nil constant (otherwise).
-local function get_real_aspect(pos)
-	local ndef, node = get_ndef(pos)
-	if ndef.advtrains and ndef.advtrains.get_aspect then
-		local asp = ndef.advtrains.get_aspect(pos, node) or I.DANGER
-		return adjust_aspect(pos, asp)
-	end
-	return nil
-end
-
---- Get the aspect of a signal.
--- @function signal_get_aspect
--- @param pos The position of the signal.
--- @return[1] The aspect of the signal (if present).
--- @return[2] The nil constant (otherwise).
-get_aspect = function(pos)
-	local asp = get_supposed_aspect(pos)
-	if not asp then
-		asp = get_real_aspect(pos)
-		set_supposed_aspect(pos, asp)
-	end
-	return asp
-end
-
---- Set the aspect of a signal.
--- @function signal_set_aspect
--- @param pos The position of the signal.
--- @param asp The new signal aspect.
--- @param[opt=false] skipdst Whether to skip updating distant signals.
-local function set_aspect(pos, asp, skipdst)
-	local node = N.get_node(pos)
-	local ndef = minetest.registered_nodes[node.name]
-	if ndef and ndef.advtrains and ndef.advtrains.set_aspect then
-		local oldasp = I.signal_get_aspect(pos) or DANGER
-		local newasp = adjust_aspect(pos, asp)
-		set_supposed_aspect(pos, newasp)
-		ndef.advtrains.set_aspect(pos, node, newasp)
-		I.signal_on_aspect_changed(pos)
-		local aspect_changed = oldasp ~= newasp
-		if (not skipdst) and aspect_changed then
-			D.update_main(pos)
-		end
-	end
-end
-
---- Remove a signal from cache.
--- @function signal_clear_aspect
--- @param pos The position of the signal.
-local function clear_aspect(pos)
-	set_supposed_aspect(pos, nil)
-end
-
---- Readjust the aspect of a signal.
--- @function signal_readjust_aspect
--- @param pos The position of the signal.
-local function readjust_aspect(pos)
-	set_aspect(pos, get_aspect(pos))
-end
-
-I.signal_get_supported_aspects = get_supported_aspects
-I.signal_get_real_aspect = get_real_aspect
-I.signal_get_aspect = get_aspect
-I.signal_set_aspect = set_aspect
-I.signal_clear_aspect = clear_aspect
-I.signal_readjust_aspect = readjust_aspect
diff --git a/advtrains_interlocking/signal_aspect_ui.lua b/advtrains_interlocking/signal_aspect_ui.lua
index a81b7fe..e5d2003 100644
--- a/advtrains_interlocking/signal_aspect_ui.lua
+++ b/advtrains_interlocking/signal_aspect_ui.lua
@@ -1,262 +1,188 @@
 local F = advtrains.formspec
-local players_aspsel = {}
 
-local function describe_main_aspect(spv)
-	if spv == 0 then
-		return attrans("Danger (halt)")
-	elseif spv == -1 then
-		return attrans("Continue at maximum speed")
-	elseif not spv then
-		return attrans("Continue with current speed limit")
+function advtrains.interlocking.show_signal_form(pos, node, pname, aux_key)
+	local sigd = advtrains.interlocking.db.get_sigd_for_signal(pos)
+	if sigd and not aux_key then
+		advtrains.interlocking.show_signalling_form(sigd, pname)
 	else
-		return attrans("Continue with the speed limit of @1", tostring(spv))
-	end
-end
-
-local function describe_shunt_aspect(shunt)
-	if shunt then
-		return attrans("Shunting allowed")
-	else
-		return attrans("No shunting")
+		if advtrains.interlocking.signal.get_signal_cap_level(pos) >= 2 then
+			advtrains.interlocking.show_ip_sa_form(pos, pname)
+		else
+			advtrains.interlocking.show_ip_form(pos, pname)
+		end
 	end
 end
 
-local function describe_distant_aspect(spv)
-	if spv == 0 then
-		return attrans("Expect to stop at the next signal")
-	elseif spv == -1 then
-		return attrans("Expect to continue at maximum speed")
-	elseif not spv then
-		return attrans("No distant signal information")
-	else
-		return attrans("Expect to continue with a speed limit of @1", tostring(spv))
-	end
+local players_assign_ip = {}
+local players_assign_distant = {}
+
+local function ipmarker(ipos, connid)
+	local node_ok, conns, rhe = advtrains.get_rail_info_at(ipos, advtrains.all_tracktypes)
+	if not node_ok then return end
+	local yaw = advtrains.dir_to_angle(conns[connid].c)
+
+	-- using tcbmarker here
+	local obj = minetest.add_entity(vector.add(ipos, {x=0, y=0.2, z=0}), "advtrains_interlocking:tcbmarker")
+	if not obj then return end
+	obj:set_yaw(yaw)
+	obj:set_properties({
+		textures = { "at_il_signal_ip.png" },
+	})
 end
 
-advtrains.interlocking.describe_main_aspect = describe_main_aspect
-advtrains.interlocking.describe_shunt_aspect = describe_shunt_aspect
-advtrains.interlocking.describe_distant_aspect = describe_distant_aspect
-
-local function dsel(p, q, x, y)
-	if p == nil then
-		if q then
-			return x
-		else
-			return y
-		end
-	elseif p then
-		return x
+function advtrains.interlocking.make_ip_formspec_component(pos, x, y, w)
+	advtrains.interlocking.db.check_for_duplicate_ip(pos)
+	local pts, connid = advtrains.interlocking.db.get_ip_by_signalpos(pos)
+	if pts then
+		-- display marker
+		local ipos = minetest.string_to_pos(pts)
+		ipmarker(ipos, connid)
+		return table.concat {
+			F.S_label(x, y, "Influence point is set at @1.", string.format("%s/%s", pts, connid)),
+			F.S_button_exit(x, y+0.5, w/2-0.125, "ip_set", "Modify"),
+			F.S_button_exit(x+w/2+0.125, y+0.5, w/2-0.125, "ip_clear", "Clear"),
+		}
 	else
-		return y
+		return table.concat {
+			F.S_label(x, y, "Influence point is not set."),
+			F.S_button_exit(x, y+0.5, w, "ip_set", "Set influence point"),
+		}
 	end
 end
 
-local function describe_supported_aspects(suppasp, isasp)
-	local t = {}
-
-	local entries = {attrans("Use default value")}
-	local selid = 0
-	local mainasps = suppasp.main
-	if type(mainasps) ~= "table" then
-		mainasps = {mainasps}
-	end
-	for idx, spv in ipairs(mainasps) do
-		if isasp and spv == rawget(isasp, "main") then
-			selid = idx
-		end
-		entries[idx+1] = describe_main_aspect(spv)
-	end
-	t.main = entries
-	t.main_current = selid+1
-	t.main_string = tostring(isasp.main)
-	if t.main == nil then
-		t.main_string = ""
+-- shows small formspec to set the signal influence point
+-- only_notset: show only if it is not set yet (used by signal tcb assignment)
+function advtrains.interlocking.show_ip_form(pos, pname, only_notset)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		return
 	end
-
-	t.shunt = {
-		attrans("No shunting"),
-		attrans("Shunting allowed"),
-		attrans("Proceed as main"),
+	local ipform = advtrains.interlocking.make_ip_formspec_component(pos, 0.5, 0.5, 7)
+	local form = {
+		"formspec_version[4]",
+		"size[8,2.25]",
+		ipform,
 	}
-
-	t.shunt_current = dsel(suppasp.shunt, isasp.shunt, 2, 1)
-	if dsel(suppasp.proceed_as_main, isasp.proceed_as_main, t.shunt_current == 1) then
-		t.shunt_current = 3
-	end
-	t.shunt_const = suppasp.shunt ~= nil
-
-	if suppasp.group then
-		local gdef = advtrains.interlocking.aspect.get_group_definition(suppasp.group)
-		if gdef then
-			t.group = suppasp.group
-			t.groupdef = gdef
-			local entries = {}
-			local selid = 1
-			for idx, name in ipairs(suppasp.name or {}) do
-				entries[idx] = gdef.aspects[name].label
-				if suppasp.group == isasp.group and name == isasp.name then
-					selid = idx
-				end
-			end
-			t.name = entries
-			t.name_current = selid
-		end
+	if not only_notset or not pts then
+		minetest.show_formspec(pname, "at_il_ipsaform_"..minetest.pos_to_string(pos), table.concat(form))
 	end
-
-	return t
 end
 
-advtrains.interlocking.describe_supported_aspects = describe_supported_aspects
-
-local function make_signal_aspect_selector(suppasp, purpose, isasp)
-	local t = describe_supported_aspects(suppasp, isasp)
-	local formmode = 1
-
-	local pos
-	if type(purpose) == "table" then
-		formmode = 2
-		pos = purpose.pos
+-- shows larger formspec to set the signal influence point, main aspect and distant signal pos
+-- only_notset: show only if it is not set yet (used by signal tcb assignment)
+function advtrains.interlocking.show_ip_sa_form(pos, pname)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		return
 	end
-
+	local ipform = advtrains.interlocking.make_ip_formspec_component(pos, 0.5, 0.5, 7)
+	local ma, rpos = advtrains.interlocking.signal.get_aspect(pos)
+	local saform = F.S_button_exit(0, 2, 4, "sa_dst_assign", rpos and minetest.pos_to_string(rpos) or "<distant signal>")
+			.. F.S_button_exit(0, 3, 2, "sa_tmp_mainfree", "Main to free") .. F.S_button_exit(2, 3, 2, "sa_tmp_mainhalt", "Main to halt")
 	local form = {
 		"formspec_version[4]",
-		string.format("size[8,%f]", ({5.75, 10.75})[formmode]),
-		F.S_label(0.5, 0.5, "Select signal aspect"),
+		"size[8,4]",
+		ipform,
+		saform,
 	}
-	local h0 = ({0, 1.5})[formmode]
-	form[#form+1] = F.S_label(0.5, 1.5+h0, "Main aspect")
-	form[#form+1] = F.S_label(0.5, 3+h0, "Shunt aspect")
-	form[#form+1] = F.S_button_exit(0.5, 4.5+h0, 7, "asp_save", "Save signal aspect")
-	if formmode == 1 then
-		form[#form+1] = F.label(0.5, 1, purpose)
-		form[#form+1] = F.field(0.5, 2, 7, "asp_mainval", "", t.main_string)
-	elseif formmode == 2 then
-		if t.group then
-			form[#form+1] = F.S_label(0.5, 1.5, "Signal aspect group: @1", t.groupdef.label)
-			form[#form+1] = F.dropdown(0.5, 2, 7, "asp_namesel", t.name, t.name_current, true)
-		else
-			form[#form+1] = F.S_label(0.5, 1.5, "This signal does not belong to a signal aspect group.")
-			form[#form+1] = F.S_label(0.5, 2, "You can not use a predefined signal aspect.")
-		end
-		form[#form+1] = F.S_label(0.5, 1, "Signal at @1", minetest.pos_to_string(pos))
-		form[#form+1] = F.dropdown(0.5, 3.5, 7, "asp_mainsel", t.main, t.main_current, true)
-		form[#form+1] = advtrains.interlocking.make_ip_formspec_component(pos, 0.5, 7, 7)
-		form[#form+1] = advtrains.interlocking.make_short_dst_formspec_component(pos, 0.5, 8.5, 7)
-	end
+	minetest.show_formspec(pname, "at_il_ipsaform_"..minetest.pos_to_string(pos), table.concat(form))
+end
 
-	if formmode == 2 and t.shunt_const then
-		form[#form+1] = F.label(0.5, 3.5+h0, t.shunt[t.shunt_current])
-		form[#form+1] = F.S_label(0.5, 4+h0, "The shunt aspect cannot be changed.")
-	else
-		form[#form+1] = F.dropdown(0.5, 3.5+h0, 7, "asp_shunt", t.shunt, t.shunt_current, true)
+function advtrains.interlocking.handle_ip_sa_formspec_fields(pname, pos, fields)
+	if not (pos and minetest.check_player_privs(pname, {train_operator=true, interlocking=true})) then
+		return
+	end
+	if fields.ip_set then
+		advtrains.interlocking.init_ip_assign(pos, pname)
+	elseif fields.ip_clear then
+		advtrains.interlocking.db.clear_ip_by_signalpos(pos)
+	elseif fields.sa_dst_assign then
+		advtrains.interlocking.init_distant_assign(pos, pname)
+	elseif fields.sa_tmp_mainfree then
+		local ma, rpos = advtrains.interlocking.signal.get_aspect(pos)
+		advtrains.interlocking.signal.set_aspect(pos, "_free", -1, rpos)
+	elseif fields.sa_tmp_mainhalt then
+		local ma, rpos = advtrains.interlocking.signal.get_aspect(pos)
+		advtrains.interlocking.signal.set_aspect(pos, nil, nil, rpos)
 	end
-
-	return table.concat(form)
 end
 
-function advtrains.interlocking.show_signal_aspect_selector(pname, p_suppasp, p_purpose, callback, isasp)
-	local suppasp = p_suppasp or {
-		main = {0, -1},
-		dst = {false},
-		shunt = false,
-		info = {},
-	}
-	local purpose = p_purpose or ""
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	local pname = player:get_player_name()
+	local pts = string.match(formname, "^at_il_ipsaform_([^_]+)$")
 	local pos
-	if type(p_purpose) == "table" then
-		pos = p_purpose
-		purpose = {pname = pname, pos = pos}
+	if pts then
+		pos = minetest.string_to_pos(pts)
 	end
-
-	local form = make_signal_aspect_selector(suppasp, purpose, isasp)
-	if not form then
-		return
+	if pos then
+		advtrains.interlocking.handle_ip_sa_formspec_fields(pname, pos, fields)
 	end
+end)
 
-	local token = advtrains.random_id()
-	minetest.show_formspec(pname, "at_il_sigaspdia_"..token, form)
-	minetest.after(0, function()
-		players_aspsel[pname] = {
-			purpose = purpose,
-			suppasp = suppasp,
-			callback = callback,
-			token = token,
-		}
-	end)
-end
-
-local function usebool(sup, val, free)
-	if sup == nil then
-		return val == free
-	else
-		return sup
+-- inits the signal IP assignment process
+function advtrains.interlocking.init_ip_assign(pos, pname)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
 	end
+	--remove old IP
+	--advtrains.interlocking.db.clear_ip_by_signalpos(pos)
+	minetest.chat_send_player(pname, "Configuring Signal: Please look in train's driving direction and punch rail to set influence point.")
+	
+	players_assign_ip[pname] = pos
 end
 
-local function get_aspect_from_formspec(suppasp, fields, psl)
-	local namei, group, name = tonumber(fields.asp_namesel), suppasp.group, nil
-	local gdef = advtrains.interlocking.aspect.get_group_definition(group)
-	if gdef then
-		local names = suppasp.name or {}
-		name = names[namei] or names[names]
-	else
-		group = nil
-	end
-	local maini = tonumber(fields.asp_mainsel)
-	local main = (suppasp.main or {})[(maini or 0)-1]
-	if not maini then
-		local mainval = fields.asp_mainval
-		if mainval == "-1" then
-			main = -1
-		elseif mainval == "x" then
-			main = false
-		elseif string.match(mainval, "^%d+$") then
-			main = tonumber(mainval)
-		else
-			main = nil
-		end
-	elseif maini <= 1 then
-		main = nil
-	end
-	local shunti = tonumber(fields.asp_shunt)
-	local shunt = suppasp.shunt
-	if shunt == nil then
-		shunt = shunti == 2
-	end
-	local proceed_as_main = suppasp.proceed_as_main
-	if proceed_as_main == nil then
-		proceed_as_main = shunti == 3
+-- inits the distant signal assignment process
+function advtrains.interlocking.init_distant_assign(pos, pname)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		minetest.chat_send_player(pname, "Insufficient privileges to use this!")
+		return
 	end
-	return advtrains.interlocking.aspect {
-		main = main,
-		shunt = shunt,
-		proceed_as_main = proceed_as_main,
-		info = {},
-		name = name,
-		group = group,
-	}
+	minetest.chat_send_player(pname, "Set distant signal: Punch the main signal to assign!")
+	
+	players_assign_distant[pname] = pos
 end
 
-minetest.register_on_player_receive_fields(function(player, formname, fields)
+minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
 	local pname = player:get_player_name()
-	local psl = players_aspsel[pname]
-	if psl then
-		if formname == "at_il_sigaspdia_"..psl.token then
-			local suppasp = psl.suppasp
-			if fields.asp_save then
-				local asp
-				asp = get_aspect_from_formspec(suppasp, fields, psl)
-				if asp then
-					psl.callback(pname, asp)
+	if not minetest.check_player_privs(pname, "interlocking") then
+		return
+	end
+	-- IP assignment
+	local signalpos = players_assign_ip[pname]
+	if signalpos then
+		if vector.distance(pos, signalpos)<=50 then
+			local node_ok, conns, rhe = advtrains.get_rail_info_at(pos, advtrains.all_tracktypes)
+			if node_ok and #conns == 2 then
+				
+				local yaw = player:get_look_horizontal()
+				local plconnid = advtrains.yawToClosestConn(yaw, conns)
+				
+				-- add assignment if not already present.
+				local pts = advtrains.roundfloorpts(pos)
+				if not advtrains.interlocking.db.get_ip_signal_asp(pts, plconnid) then
+					advtrains.interlocking.db.set_ip_signal(pts, plconnid, signalpos)
+					ipmarker(pos, plconnid)
+					minetest.chat_send_player(pname, "Configuring Signal: Successfully set influence point")
+				else
+					minetest.chat_send_player(pname, "Configuring Signal: Influence point of another signal is already present!")
 				end
-			end
-			if type(psl.purpose) == "table" then
-				local pos = psl.purpose.pos
-				advtrains.interlocking.handle_ip_formspec_fields(pname, pos, fields)
-				advtrains.interlocking.handle_dst_formspec_fields(pname, pos, fields)
+			else
+				minetest.chat_send_player(pname, "Configuring Signal: This is not a normal two-connection rail! Aborted.")
 			end
 		else
-			players_aspsel[pname] = nil
+			minetest.chat_send_player(pname, "Configuring Signal: Node is too far away. Aborted.")
 		end
+		players_assign_ip[pname] = nil
+	end
+	-- DST assignment
+	signalpos = players_assign_distant[pname]
+	if signalpos then
+		-- get current mainaspect
+		local ma, rpos = advtrains.interlocking.signal.get_aspect(signalpos)
+		-- if punched pos is valid signal then set it as the new remote, otherwise nil
+		local nrpos
+		if advtrains.interlocking.signal.get_signal_cap_level(pos) > 1 then nrpos = pos end
+		advtrains.interlocking.signal.set_aspect(signalpos, ma.name, ma.speed, nrpos)
+		players_assign_distant[pname] = nil
 	end
 end)
+
diff --git a/advtrains_interlocking/tcb_ts_ui.lua b/advtrains_interlocking/tcb_ts_ui.lua
index bfec648..caf22e3 100755
--- a/advtrains_interlocking/tcb_ts_ui.lua
+++ b/advtrains_interlocking/tcb_ts_ui.lua
@@ -186,7 +186,7 @@ minetest.register_on_punchnode(function(pos, node, player, pointed_thing)
 			local is_signal = minetest.get_item_group(node.name, "advtrains_signal") >= 2
 			if is_signal then
 				local ndef = minetest.registered_nodes[node.name]
-				if ndef and ndef.advtrains and ndef.advtrains.set_aspect then
+				if ndef and ndef.advtrains and ndef.advtrains.apply_aspect then
 					local tcbs = ildb.get_tcbs(sigd)
 					if tcbs then
 						tcbs.signal = pos
@@ -464,7 +464,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		ts.route = nil
 		for _, sigd in ipairs(ts.tc_breaks) do
 			local tcbs = ildb.get_tcbs(sigd)
-			advtrains.interlocking.update_signal_aspect(tcbs)
+			advtrains.interlocking.signal.update_route_aspect(tcbs)
 		end
 		minetest.chat_send_player(pname, "Reset track section "..ts_id.."!")
 	end
@@ -642,7 +642,6 @@ function advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, calle
 				form = form.."button[0.5,8;2.5,1;newroute;New Route]"
 				form = form.."button[  3,8;2.5,1;unassign;Unassign Signal]"
 				form = form..string.format("checkbox[0.5,8.75;ars;Automatic routesetting;%s]", not tcbs.ars_disabled)
-				form = form..string.format("checkbox[0.5,9.25;dst;Distant signalling;%s]", not tcbs.nodst)
 			end
 		elseif sigd_equal(tcbs.route_origin, sigd) then
 			-- something has gone wrong: tcbs.routeset should have been set...
@@ -660,7 +659,7 @@ function advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, calle
 	-- always a good idea to update the signal aspect
 	if not called_from_form_update then
 	-- FIX prevent a callback loop
-		advtrains.interlocking.update_signal_aspect(tcbs)
+		advtrains.interlocking.signal.update_route_aspect(tcbs)
 	end
 end
 
@@ -769,10 +768,6 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		if fields.ars then
 			tcbs.ars_disabled = not minetest.is_yes(fields.ars)
 		end
-
-		if fields.dst then
-			tcbs.nodst = not minetest.is_yes(fields.dst)
-		end
 		
 		if fields.auto then
 			tcbs.route_auto = true
-- 
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