Indicate routesetting trigger if a route is set

A player observed an issue with a certain setup where ARS is constantly
triggered and the route cannot (easily) be canceled. This patch helps
troubleshoot this issue by indicating the specific cause for
routesetting (in particular, which train triggered ARS).

3 files changed, 13 insertions, 6 deletions

diff --git a/advtrains_interlocking/ars.lua b/advtrains_interlocking/ars.lua
index 393878a..99401d4 100644
--- a/advtrains_interlocking/ars.lua
+++ b/advtrains_interlocking/ars.lua
@@ -70,6 +70,7 @@
 ]]
 
 local il = advtrains.interlocking
+local S = il.translate
 
 local function parse_trainlen(tlstr)
 	mins, maxs = string.match(tlstr, "^(%d*)%-(%d+)$")
@@ -385,7 +386,7 @@ function advtrains.interlocking.ars_check(signalpos, train, trig_from_dst)
 			--atdebug("Ars setting ",rteid)
 			--delay routesetting, it should not occur inside train step
 			-- using after here is OK because that gets called on every path recalculation
-			minetest.after(0, il.route.update_route, sigd, tcbs, rteid, nil)
+			minetest.after(0, il.route.update_route, sigd, tcbs, rteid, nil, S("Train @1", train.id))
 		end
 	end
 end
diff --git a/advtrains_interlocking/routesetting.lua b/advtrains_interlocking/routesetting.lua
index 2332040..eec1460 100644
--- a/advtrains_interlocking/routesetting.lua
+++ b/advtrains_interlocking/routesetting.lua
@@ -329,6 +329,7 @@ function ilrs.cancel_route_from(sigd)
 		c_tcbs.route_aspect = nil
 		c_tcbs.route_remote = nil
 		c_tcbs.routeset = nil
+		c_tcbs.routeset_trigger = nil
 		c_tcbs.route_auto = nil
 		c_tcbs.route_origin = nil
 		
@@ -369,7 +370,8 @@ end
 -- sigd, tcbs: self-explanatory
 -- newrte: If a new route should be set, the route index of it (in tcbs.routes). Can also be a table (multi-ars). nil otherwise
 -- cancel: true in combination with newrte=nil causes cancellation of the current route.
-function ilrs.update_route(sigd, tcbs, newrte, cancel)
+-- trigger: The reason for setting the route
+function ilrs.update_route(sigd, tcbs, newrte, cancel, trigger)
 	--atdebug("Update_Route for",sigd,tcbs.signal_name)
 	local has_changed_aspect = false
 	if tcbs.route_origin and not sigd_equal(tcbs.route_origin, sigd) then
@@ -388,6 +390,7 @@ function ilrs.update_route(sigd, tcbs, newrte, cancel)
 		tcbs.route_remote = nil
 		has_changed_aspect = true
 		tcbs.routeset = nil
+		tcbs.routeset_trigger = nil
 		tcbs.route_auto = nil
 	end
 	if newrte or tcbs.routeset then
@@ -399,11 +402,13 @@ function ilrs.update_route(sigd, tcbs, newrte, cancel)
 				error("update_route got multi-ARS with empty table, this is not allowed")
 			end
 			tcbs.routeset = newrte
+			tcbs.routeset_trigger = trigger
 		else
 			if type(tcbs.routeset)=="table" and not next(tcbs.routeset) then
 				-- just unset, don't error
 				atwarn(sigd, "had multi-ARS route set with empty list! Cancelled!")
 				tcbs.routeset = nil
+				tcbs.routeset_trigger = nil
 				return
 			end
 		end
diff --git a/advtrains_interlocking/tcb_ts_ui.lua b/advtrains_interlocking/tcb_ts_ui.lua
index c9cae07..a44fd66 100755
--- a/advtrains_interlocking/tcb_ts_ui.lua
+++ b/advtrains_interlocking/tcb_ts_ui.lua
@@ -858,12 +858,13 @@ function advtrains.interlocking.show_signalling_form(sigd, pname, sel_rte, calle
 			form = form.."label[0.5,2.5;"..S("A route is requested from this signal:").."]"
 			form = form.."label[0.5,3.0;"..minetest.formspec_escape(rte.name).."]"
 		end
+		form = form .. "label[0.5,3.5;" .. core.formspec_escape(S("Routesetting trigger: @1", tcbs.routeset_trigger or S("Unknown reason"))) .. "]"
 		if tcbs.route_committed then
-			form = form.."label[0.5,3.5;"..S("Route has been set.").."]"
+			form = form.."label[0.5,4;"..S("Route has been set.").."]"
 		else
-			form = form.."label[0.5,3.5;"..S("Waiting for route to be set...").."]"
+			form = form.."label[0.5,4;"..S("Waiting for route to be set...").."]"
 			if tcbs.route_rsn then
-				form = form.."label[0.5,4;"..minetest.formspec_escape(tcbs.route_rsn).."]"
+				form = form.."label[0.5,4.5;"..minetest.formspec_escape(tcbs.route_rsn).."]"
 			end
 		end
 		if not tcbs.route_auto then
@@ -1044,7 +1045,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 			end
 			if sel_rte and tcbs.routes[sel_rte] then
 				if fields.setroute then
-					ilrs.update_route(sigd, tcbs, sel_rte)
+					ilrs.update_route(sigd, tcbs, sel_rte, nil, S("Manual routesetting by @1", pname))
 				end
 				if fields.dsproute then
 					local t = os.clock()