update plugin-utils Lua example script

diff --git a/scripts/s_pluginutils.lua b/scripts/s_pluginutils.lua
index 3af803a03e4223d6ccfb051dfc2d499c36fc7a50..2f42160b0a8e4abc8357c691dab4de2968dcd15a 100644 (file)
--- a/scripts/s_pluginutils.lua
+++ b/scripts/s_pluginutils.lua
@@ -8,6 +8,7 @@ function factory () return function ()
        for r in Session:get_routes():iter() do
                if (string.match (r:name(), "dru") and r:n_inputs():n_audio() == 1) then
                        local proc = ARDOUR.LuaAPI.new_plugin(Session, "http://gareus.org/oss/lv2/fil4#mono", ARDOUR.PluginType.LV2, "cutbass");
+                       assert (not proc:isnil())
                        r:add_processor_by_index(proc, 0, nil, true)
                end
        end
@@ -16,9 +17,12 @@ function factory () return function ()
        -------------------------------------------------------------------------------
        -- load a plugin preset
        route = Session:get_remote_nth_route(2)
+       assert (route)
        -- to 4th plugin (from top), ardour starts counting at zero
        plugin = route:nth_plugin(3):to_insert():plugin(0)
+       assert (not plugin:isnil())
        ps = plugin:preset_by_label("cutbass") -- get preset by name
+       assert (ps)
        print (ps.uri)
        plugin:load_preset (ps)
 
@@ -27,7 +31,12 @@ function factory () return function ()
        -- add a LuaProcessor (here "Scope") to all tracks
        for t in Session:get_tracks():iter() do
                local pos = 0 -- insert at the top
-               local proc = ARDOUR.LuaAPI.new_luaproc(Session, "Inline Scope");
+
+               -- the following two lines are equivalent
+               --local proc = ARDOUR.LuaAPI.new_luaproc(Session, "a-Inline Scope");
+               local proc = ARDOUR.LuaAPI.new_plugin (Session, "a-Inline Scope", ARDOUR.PluginType.Lua, "");
+               assert (not proc:isnil())
+
                t:add_processor_by_index(proc, pos, nil, true)
                -- optionally set some parameters
                ARDOUR.LuaAPI.set_processor_param (proc, 0, 5) -- timescale 5sec