Fixes Issue mt-mods#64

Uses a simple boolean setting in default_settings.lua to decide which digiline rules to use in common.lua

common.lua

@@ -15,7 +15,17 @@ pipeworks.rules_all = {{x=0, y=0, z=1},{x=0, y=0, z=-1},{x=1, y=0, z=0},{x=-1, y
 		{x=0, y=1, z=0}, {x=0, y=-1, z=0}}
 
 pipeworks.mesecons_rules={{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=1,y=0,z=0},{x=-1,y=0,z=0},{x=0,y=1,z=0},{x=0,y=-1,z=0}}
-pipeworks.digilines_rules={{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=1,y=0,z=0},{x=-1,y=0,z=0},{x=0,y=1,z=0},{x=0,y=-1,z=0}}
+
+local digilines_enabled = minetest.get_modpath("digilines") ~= nil
+if digilines_enabled and pipeworks.use_default_digilines_rules then
+	pipeworks.digilines_rules=digilines.rules.default
+else
+	-- These rules break vertical connectivity to deployers, node breakers, dispensers, and digiline filter injectors
+	-- via digiline conducting tubes. Changing them may break some builds on some servers, so the setting was added
+	-- for server admins to be able to revert to the old "broken" behavior as some builds may use it as a "feature".
+	-- See https://github.com/mt-mods/pipeworks/issues/64
+	pipeworks.digilines_rules={{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=1,y=0,z=0},{x=-1,y=0,z=0},{x=0,y=1,z=0},{x=0,y=-1,z=0}}
+end
 
 pipeworks.liquid_texture = minetest.registered_nodes[pipeworks.liquids.water.flowing].tiles[1]
 if type(pipeworks.liquid_texture) == "table" then pipeworks.liquid_texture = pipeworks.liquid_texture.name end

default_settings.lua

@@ -31,6 +31,7 @@ local settings = {
 	delete_item_on_clearobject = true,
 	use_real_entities = true,
 	entity_update_interval = 0,
+	use_default_digilines_rules = true,
 }
 
 pipeworks.toggles = {}

settingtypes.txt

@@ -85,6 +85,11 @@ pipeworks_use_real_entities (Use Real Entities) bool true
 #A value 0.2 or above may cause issues with accelerator tubes.
 pipeworks_entity_update_interval (Entity Update Interval) float 0 0 0.8
 
+# Use the default rules from the digilines mod.
+# If enabled pipeworks devices (filter injector, deployer, dispenser, node breaker, 
+# teleport tube, lua tube, etc) will conduct digiline signals vertically.
+pipeworks_use_default_digilines_rules (Use the default rules from the digilines mod) bool true
+
 # if set to true, items passing through teleport tubes will log log where they came from and where they went.
 pipeworks_log_teleport_tubes (Log Teleport Tubes) bool false