Add a Lua script to send multiple tracks to an aux-bus.

scripts/send_to_bus.lua

@@ -0,0 +1,43 @@
+ardour { ["type"] = "EditorAction", name = "Send Tracks to Bus",
+	license     = "MIT",
+	author      = "Ardour Team",
+	description = [[Create a Bus and add aux-sends from all selected tracks]]
+}
+
+function factory () return function ()
+	-- find number of channels to use for the new bus, follow master-bus' inputs
+	local chn = 2
+	local mst = Session:master_out();
+	if not mst:isnil() then
+		chn = mst:n_inputs():n_audio()
+	end
+	mst = nil -- explicitly drop reference
+
+	local sel = Editor:get_selection () -- get selection
+	local tracks = ARDOUR.RouteListPtr() -- create a new list
+
+	-- find selected *tracks*, add to tracks list
+	for r in sel.tracks:routelist ():iter () do
+		if r:to_track():isnil() then
+			goto next
+		end
+		tracks:push_back (r)
+		::next::
+	end
+
+	if tracks:size() > 0 then
+		local bus = Session:new_audio_route (chn, chn, nil, 1, "", ARDOUR.PresentationInfo.Flag.AudioBus, ARDOUR.PresentationInfo.max_order)
+		if bus:size () > 0 then
+			Session:add_internal_sends (bus:front(), ARDOUR.Placement.PostFader, tracks);
+		end
+	end
+end end
+
+function icon (params) return function (ctx, width, height, fg)
+	local txt = Cairo.PangoLayout (ctx, "ArdourMono ".. math.ceil(math.min (width, height) * .5) .. "px")
+	txt:set_text ("\u{2192}B") -- "->B"
+	local tw, th = txt:get_pixel_size ()
+	ctx:move_to (.5 * (width - tw), .5 * (height - th))
+	ctx:set_source_rgba (ARDOUR.LuaAPI.color_to_rgba (fg))
+	txt:show_in_cairo_context (ctx)
+end end