lua snippet to interact with portengine

scripts/s_portengine.lua

@@ -0,0 +1,33 @@
+ardour { ["type"] = "Snippet", name = "portengine" }
+function factory () return function ()
+
+	a = Session:engine()
+	print ("----- Port objects from Ardour's engine ----");
+	_, t = a:get_ports (ARDOUR.DataType("audio"), ARDOUR.PortList())
+	-- table 't' holds argument references. t[2] is the PortList
+	for p in t[2]:iter() do
+		print (p:name())
+	end
+
+	print ("----- Port names queries from the backend ----");
+	_, t = a:get_backend_ports ("", ARDOUR.DataType("audio"), 0, C.StringVector())
+	-- table 't' holds argument references. t[4] is the StringVector
+	for n in t[4]:iter() do
+		print (n)
+	end
+
+	print ("----- Connections from the backend ----");
+	_, t = a:get_backend_ports ("", ARDOUR.DataType("audio"), ARDOUR.PortFlags.IsOutput, C.StringVector())
+	for n in t[4]:iter() do
+		local printed_name = false;
+		_, ct = a:get_connections (n, C.StringVector())
+		for c in ct[2]:iter() do
+			if (not printed_name) then
+				printed_name = true;
+				print (n)
+			end
+			print (" ->", c)
+		end
+	end
+
+end end