Merge 029b4ea474 into dd34dffa45

game_api.txt

@@ -194,6 +194,26 @@ xpanes.register_pane(subname, def)
 	^ Recipe field only
 }
 
+Raillike definitions
+--------------------
+The following nodes use the group `connect_to_raillike` and will only connect to
+raillike nodes within this group and the same group value:
+
+| Node type		| Group value
++-----------------------+----------------------------------
+| default:rail		| default.connect_to_raillike.rails
+
+This is an overview of currently used groups:
+| Group value				| Description
++---------------------------------------+------------
+| default.connect_to_raillike.rails	| Rails
+
+Example:
+If you want to add a new rail type and want it to connect with default:rail,
+add `connect_to_raillike=default.connect_to_raillike.rails` into the `groups` table
+of your node.
+
+
 Default sounds
 --------------
 Sounds inside the default table can be used within the sounds field of node definitions.

mods/default/init.lua

@@ -13,6 +13,10 @@ default.gui_bg = "bgcolor[#080808BB;true]"
 default.gui_bg_img = "background[5,5;1,1;gui_formbg.png;true]"
 default.gui_slots = "listcolors[#00000069;#5A5A5A;#141318;#30434C;#FFF]"
 
+-- connect_to_raillike group values
+default.connect_to_raillike = {}
+default.connect_to_raillike.rails = 2
+
 function default.get_hotbar_bg(x,y)
 	local out = ""
 	for i=0,7,1 do

mods/default/nodes.lua

@@ -1541,7 +1541,7 @@ minetest.register_node("default:rail", {
                 -- but how to specify the dimensions for curved and sideways rails?
                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 	},
-	groups = {bendy=2,dig_immediate=2,attached_node=1},
+	groups = {bendy=2,dig_immediate=2,attached_node=1,connect_to_raillike=default.connect_to_raillike.rails},
 })