Tweak generic audio-track template

* Demo Factory method producing different functions
* Allow to run interactively as Action script

scripts/_route_template_generic_audio.lua

@@ -1,7 +1,7 @@
 ardour {
 	["type"]    = "EditorAction",
 	name        = "Generic Audio Track",
-	description = [[Example ]]
+	description = [[Add Audio tracks, by default as many as there are physical inputs]]
 }
 
 -- If a route_setup function is present in an Editor Action Script
@@ -28,8 +28,9 @@ function route_setup ()
 	}
 end
 
--- The Script can be used as EditorAction in which case it can
--- optionally provide instantiation parmaters
+-- The Script can be used as EditorAction in which case it *could*
+-- optionally provide instantiation parmaters..
+--[[
 function action_params ()
 	return
 	{
@@ -37,38 +38,82 @@ function action_params ()
 		["name"]     = { title = "Track Name Prefix", default = "Audio" },
 	}
 end
+--]]
 
 
-function factory (params) return function ()
-	-- When called from the AddRouteDialog, 'params' will be a table with
-	-- keys as described in route_setup() above.
+function factory (p)
+	-- when used from the AddRouteDialog (or w/action_params)
+	if type (p) == 'table' and p['how_many'] ~= nil then
+		return function ()
+			-- When called from the AddRouteDialog, 'p' will be a table with
+			-- keys as described in route_setup() above.
+			local name      = p["name"] or 'Audio'
+			local how_many  = p["how_many"] or 1
+			local channels  = p["channels"] or 1
+			local insert_at = p["insert_at"] or ARDOUR.PresentationInfo.max_order;
+			local group     = p["group"] or nil
+			local mode      = p["track_mode"] or ARDOUR.TrackMode.Normal
+			local strict_io = p["strict_io"] or false
+			local chan_out  = 0
 
-	local p         = params or route_setup ()
-	local name      = p["name"] or 'Audio'
-	local how_many  = p["how_many"] or 1
-	local channels  = p["channels"] or 1
-	local insert_at = p["insert_at"] or ARDOUR.PresentationInfo.max_order;
-	local group     = p["group"] or nil
-	local mode      = p["track_mode"] or ARDOUR.TrackMode.Normal
-	local strict_io = p["strict_io"] or false
-	local chan_out  = 0
+			if ARDOUR.config():get_output_auto_connect() == ARDOUR.AutoConnectOption.AutoConnectMaster then
+				if not Session:master_out():isnil() then
+					chan_out = Session:master_out():n_inputs ():n_audio ()
+				end
+			end
 
-	if ARDOUR.config():get_output_auto_connect() == ARDOUR.AutoConnectOption.AutoConnectMaster then
-		if not Session:master_out():isnil() then
-			chan_out = Session:master_out():n_inputs ():n_audio ()
+			if chan_out == 0 then
+				chan_out = channels;
+			end
+
+			local tl = Session:new_audio_track (channels, chan_out, group, how_many, name, insert_at, mode)
+
+			if strict_io then
+				for t in tl:iter() do
+					t:set_strict_io (true)
+				end
+			end
 		end
 	end
+	-- when used as standalone (no action parameters): interactive
+	return function ()
+		local e = Session:engine()
+		local _, t = e:get_backend_ports ("", ARDOUR.DataType("audio"), ARDOUR.PortFlags.IsOutput | ARDOUR.PortFlags.IsPhysical, C.StringVector())
+		local tracks = t[4]:size();
 
-	if chan_out == 0 then
-		chan_out = channels;
-	end
+		local dialog_options = {
+			{ type = "number",   key = "tracks", title = "Create Tracks",  min = 1, max = 128, step = 1, digits = 0, default = tracks },
+			{ type = "entry",    key = "name",   default = 'Audio', title = "Name Prefix" },
+			{ type = "checkbox", key = "stereo", default = false, title = "Stereo" },
+			{ type = "checkbox", key = "recarm", default = false, title = "Record Arm Tracks" },
+		}
 
-	local tl = Session:new_audio_track (channels, chan_out, group, how_many, name, insert_at, mode)
+		local dlg = LuaDialog.Dialog ("Create Audio Tracks", dialog_options)
+		local rv = dlg:run()
+		if (not rv or rv['tracks'] == 0) then
+			return
+		end
 
-	if strict_io then
-		for t in tl:iter() do
-			t:set_strict_io (true)
+		local chan_in = stereo and 2 or 1
+		local chan_out  = 0
+
+		if ARDOUR.config():get_output_auto_connect() == ARDOUR.AutoConnectOption.AutoConnectMaster then
+			if not Session:master_out():isnil() then
+				chan_out = Session:master_out():n_inputs ():n_audio ()
+			end
+		end
+
+		if chan_out == 0 then
+			chan_out = chan_in;
+		end
+
+		-- create tracks
+		local tl = Session:new_audio_track (chan_in, chan_out, nil, rv['tracks'], "", ARDOUR.PresentationInfo.max_order, ARDOUR.TrackMode.Normal)
+		-- and optionally record-arm them
+		if rv['recarm'] then
+			for track in tl:iter() do
+				track:rec_enable_control ():set_value (1, PBD.GroupControlDisposition.NoGroup)
+			end
 		end
 	end
-
-end end
+end