From 30f4e342fdc6bd74c72bcbb649d4e1ccf974bcab Mon Sep 17 00:00:00 2001
From: Gabriel Pérez-Cerezo <gabriel@gpcf.eu>
Date: Wed, 30 Jun 2021 23:46:00 +0200
Subject: Make the collision mode configurable

If the advtrains_forgiving_collision setting is set to true, then the
train only collides with nodes that do not have normal
drawtype. Otherwise the old behavior is restored. This change is being
made because there were users and mods relying on the old behavior,
such as the railroad_paraphernalia mod's track blocker.
---
 advtrains/settingtypes.txt |  5 ++++
 advtrains/trainlogic.lua   | 62 +++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 58 insertions(+), 9 deletions(-)

diff --git a/advtrains/settingtypes.txt b/advtrains/settingtypes.txt
index 6acff80..2b627cb 100644
--- a/advtrains/settingtypes.txt
+++ b/advtrains/settingtypes.txt
@@ -56,3 +56,8 @@ advtrains_dtime_limit (DTime Limit for slow-down) float 0.2 0 5
 #    Time interval in seconds in which advtrains stores its save data to disk
 #    Nevertheless, advtrains saves all data when shutting down the server.
 advtrains_save_interval (Save Interval) int 60 20 3600
+
+#    Enable forgiving collision mode
+#    If enabled, trains only collide with nodes with "normal" drawtype.
+advtrains_forgiving_collision (Forgiving Collision mode) bool false
+
diff --git a/advtrains/trainlogic.lua b/advtrains/trainlogic.lua
index 7093929..0f2a66e 100644
--- a/advtrains/trainlogic.lua
+++ b/advtrains/trainlogic.lua
@@ -1368,17 +1368,61 @@ function advtrains.invalidate_path(id)
 end
 
 --not blocking trains group
-function advtrains.train_collides(node)
-	if node and minetest.registered_nodes[node.name] then
-		local ndef = minetest.registered_nodes[node.name]
-		-- if the node is drawtype normal (that is a full cube) then it does collide
-		if ndef.drawtype == "normal" then
-			-- except if it is not_blocking_trains
-			if ndef.groups.not_blocking_trains and ndef.groups.not_blocking_trains ~= 0 then
-				return false
+
+if minetest.settings:get_bool("advtrains_forgiving_collision") then
+	function advtrains.train_collides(node)
+		if node and minetest.registered_nodes[node.name] then
+			local ndef = minetest.registered_nodes[node.name]
+			-- if the node is drawtype normal (that is a full cube) then it does collide
+			if ndef.drawtype == "normal" then
+				-- except if it is not_blocking_trains
+				if ndef.groups.not_blocking_trains and ndef.groups.not_blocking_trains ~= 0 then
+					return false
+				end
+				return true
 			end
+		end
+		return false
+	end
+else
+	function advtrains.train_collides(node)
+		if node and minetest.registered_nodes[node.name] and minetest.registered_nodes[node.name].walkable then
+		if not minetest.registered_nodes[node.name].groups.not_blocking_trains then
 			return true
 		end
+		end
+		return false
 	end
-	return false
+	
+	local nonblocknodes={
+		"default:fence_wood",
+		"default:fence_acacia_wood",
+		"default:fence_aspen_wood",
+		"default:fence_pine_wood",
+		"default:fence_junglewood",
+		"default:torch",
+		"bones:bones",
+		
+		"default:sign_wall",
+		"signs:sign_wall",
+		"signs:sign_wall_blue",
+		"signs:sign_wall_brown",
+		"signs:sign_wall_orange",
+		"signs:sign_wall_green",
+		"signs:sign_yard",
+		"signs:sign_wall_white_black",
+		"signs:sign_wall_red",
+		"signs:sign_wall_white_red",
+		"signs:sign_wall_yellow",
+		"signs:sign_post",
+		"signs:sign_hanging",
+		
+	}
+	minetest.after(0, function()
+							for _,name in ipairs(nonblocknodes) do
+								if minetest.registered_nodes[name] then
+									minetest.registered_nodes[name].groups.not_blocking_trains=1
+								end
+							end
+	end)
 end
-- 
cgit v1.2.3