check if YARM has required interface

ignore blueprints containing only concrete/stone paths
init globals when updating FARL
don't try to start on curves (needs reqrite first)

FARL.lua

@@ -153,7 +153,7 @@ FARL = {
       farl = FARL.new(player)
       table.insert(global.farl, farl)
     end
-    if remote.interfaces.YARM then
+    if remote.interfaces.YARM  and remote.interfaces.YARM.hide_expando then
       farl.settings.YARM_old_expando = remote.call("YARM", "hide_expando", player.index)
     end
     --apiCalls = {find={item=0,tree=0,stone=0,other=0},canplace=0,create=0,count={item=0,tree=0,stone=0,other=0}}
@@ -166,7 +166,7 @@ FARL = {
         f:deactivate()
         f.driver = false
         f.destroy = tick
-        if remote.interfaces.YARM and f.settings.YARM_old_expando then
+        if remote.interfaces.YARM and remote.interfaces.YARM.show_expando and f.settings.YARM_old_expando then
           remote.call("YARM", "show_expando", player.index)
         end
         --f.settings = false
@@ -659,6 +659,10 @@ FARL = {
 
       local maintenance = self.maintenance and 10 or false
       self.lastrail = self:findLastRail(maintenance)
+      if self.lastrail.name == self.settings.rail.curved then
+        self:deactivate({"msg-error-curves"}, true)
+        return
+      end
       self.lastCheckIndex = 1
       if self.lastrail then
         self:findLastPole()
@@ -938,6 +942,9 @@ FARL = {
       local vertSignal = signalOffset[0]
       local diagSignal = signalOffset[1]
       local e = bp[j].get_blueprint_entities()
+      if not e then -- blueprint with only tiles in it
+        break
+      end
       local offsets = {pole=false, chain=false, poleEntities={}, rails={}, signals={}}
       local bpType = false
       local rails = 0

control.lua

@@ -69,7 +69,7 @@ local function init_global()
   global.godmode = false
   godmode = global.godmode
   global.destroyNextTick = global.destroyNextTick or {}
-
+  global.version = global.version or "0.4.41"
   setMetatables()
 end
 
@@ -100,15 +100,10 @@ local function on_configuration_changed(data)
     local newVersion = data.mod_changes[MOD_NAME].new_version
     local oldVersion = data.mod_changes[MOD_NAME].old_version
     -- mod was added to existing save
-    if not oldVersion then
-      init_global()
-      init_players()
-      global.electricInstalled = remote.interfaces.dim_trains and remote.interfaces.dim_trains.railCreated
-    else
-      if oldVersion < "0.4.4" then
-        global.electricInstalled = remote.interfaces.dim_trains and remote.interfaces.dim_trains.railCreated
-      end
-    end
+    init_global()
+    init_players()
+    global.electricInstalled = remote.interfaces.dim_trains and remote.interfaces.dim_trains.railCreated
+    global.version = "0.4.41"
   end
   if data.mod_changes["5dim_trains"] then
     --5dims_trains was added/updated
@@ -131,17 +126,17 @@ end
 
 local function on_gui_click(event)
   local status, err = pcall(function()
-  local index = event.player_index
-  local player = game.players[index]
-  if player.gui.left.farl ~= nil then --and player.gui.left.farlAI == nil then
-    local farl = FARL.findByPlayer(player)
-    if farl then
-      GUI.onGuiClick(event, farl, player)
-    else
-      player.print("Gui without train, wrooong!")
-      GUI.destroyGui(player)
+    local index = event.player_index
+    local player = game.players[index]
+    if player.gui.left.farl ~= nil then --and player.gui.left.farlAI == nil then
+      local farl = FARL.findByPlayer(player)
+      if farl then
+        GUI.onGuiClick(event, farl, player)
+      else
+        player.print("Gui without train, wrooong!")
+        GUI.destroyGui(player)
+      end
     end
-  end
   end)
   if not status then
     debugDump("Unexpected error:",true)

info.json

@@ -1,6 +1,6 @@
 {
   "name": "FARL",
-  "version": "0.4.4",
+  "version": "0.4.41",
   "title": "Fully Automated Rail Layer",
   "author": "Choumiko",
   "contact": "www.factorioforums.com",