new flow logic: abm_register.lua: add extra safeguarding for conditional activation of new flow logic

new_flow_logic/abm_register.lua

@@ -1,30 +1,26 @@
 -- register new flow logic ABMs
 -- written 2017 by thetaepsilon
 
-
-
 local register = {}
 pipeworks.flowlogic.abmregister = register
 
 local flowlogic = pipeworks.flowlogic
 
--- A possible DRY violation here...
--- DISCUSS: should it be possible later on to raise the the rate of ABMs, or lower the chance?
--- Currently all the intervals and chances are hardcoded below.
-
-
-
 -- register node list for the main logic function.
 -- see flowlogic.run() in abms.lua.
 
 local register_flowlogic_abm = function(nodename)
-	minetest.register_abm({
-		nodenames = { nodename },
-		interval = 1,
-		chance = 1,
-		action = function(pos, node, active_object_count, active_object_count_wider)
-			flowlogic.run(pos, node)
-		end
-	})
+	if pipeworks.toggles.pressure_logic then
+		minetest.register_abm({
+			nodenames = { nodename },
+			interval = 1,
+			chance = 1,
+			action = function(pos, node, active_object_count, active_object_count_wider)
+				flowlogic.run(pos, node)
+			end
+		})
+	else
+		minetest.log("warning", "pipeworks pressure_logic not enabled but register.flowlogic() requested")
+	end
 end
 register.flowlogic = register_flowlogic_abm