livetrax/gtk2_ardour/ardour_ui_session.cc

/*
 * Copyright (C) 2005-2007 Doug McLain <doug@nostar.net>
 * Copyright (C) 2005-2017 Tim Mayberry <mojofunk@gmail.com>
 * Copyright (C) 2005-2019 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2005 Karsten Wiese <fzuuzf@googlemail.com>
 * Copyright (C) 2005 Taybin Rutkin <taybin@taybin.com>
 * Copyright (C) 2006-2015 David Robillard <d@drobilla.net>
 * Copyright (C) 2007-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2008-2010 Sakari Bergen <sakari.bergen@beatwaves.net>
 * Copyright (C) 2012-2019 Robin Gareus <robin@gareus.org>
 * Copyright (C) 2013-2015 Colin Fletcher <colin.m.fletcher@googlemail.com>
 * Copyright (C) 2013-2016 John Emmas <john@creativepost.co.uk>
 * Copyright (C) 2013-2016 Nick Mainsbridge <mainsbridge@gmail.com>
 * Copyright (C) 2014-2018 Ben Loftis <ben@harrisonconsoles.com>
 * Copyright (C) 2015 André Nusser <andre.nusser@googlemail.com>
 * Copyright (C) 2016-2018 Len Ovens <len@ovenwerks.net>
 * Copyright (C) 2017 Johannes Mueller <github@johannes-mueller.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifdef WAF_BUILD
#include "gtk2ardour-config.h"
#include "gtk2ardour-version.h"
#endif

#include <glibmm/error.h>

#include <gtkmm/progressbar.h>
#include <gtkmm/stock.h>

#include "pbd/basename.h"
#include "pbd/localtime_r.h"
#include "pbd/unwind.h"

#include "gtkmm2ext/application.h"
#include "gtkmm2ext/doi.h"

#include "widgets/prompter.h"

#include "ardour/audioengine.h"
#include "ardour/filename_extensions.h"
#include "ardour/plugin_manager.h"
#include "ardour/profile.h"
#include "ardour/session.h"
#include "ardour/session_utils.h"
#include "ardour/session_state_utils.h"
#include "ardour/session_directory.h"

#include "ardour_message.h"
#include "ardour_ui.h"
#include "engine_dialog.h"
#include "missing_filesource_dialog.h"
#include "missing_plugin_dialog.h"
#include "opts.h"
#include "plugin_scan_dialog.h"
#include "public_editor.h"
#include "save_as_dialog.h"
#include "session_dialog.h"
#include "session_archive_dialog.h"
#include "timers.h"
#include "ui_config.h"
#include "utils.h"

#ifdef WINDOWS_VST_SUPPORT
#include <fst.h>
#endif

#include "pbd/i18n.h"

using namespace ARDOUR;
using namespace ARDOUR_UI_UTILS;
using namespace PBD;
using namespace Gtk;
using namespace std;
using namespace ArdourWidgets;

bool
ARDOUR_UI::ask_about_loading_existing_session (const std::string& session_path)
{
	std::string str = string_compose (_("This session\n%1\nalready exists. Do you want to open it?"), session_path);

	ArdourMessageDialog msg (str,
	                         false,
	                         Gtk::MESSAGE_WARNING,
	                         Gtk::BUTTONS_YES_NO,
	                         true);

	msg.set_name (X_("OpenExistingDialog"));
	msg.set_title (_("Open Existing Session"));
	msg.set_wmclass (X_("existing_session"), PROGRAM_NAME);
	msg.set_position (Gtk::WIN_POS_CENTER);

	switch (msg.run()) {
	case RESPONSE_YES:
		return true;
		break;
	}
	return false;
}

void
ARDOUR_UI::build_session_from_dialog (SessionDialog& sd, const std::string& session_path, const std::string& session_name, std::string const& session_template, Temporal::TimeDomain domain)
{
	BusProfile bus_profile;

	if (nsm) {
		bus_profile.master_out_channels = 2;
	} else if (Profile->get_mixbus ()) {
		bus_profile.master_out_channels = 2;
	} else {
		/* get settings from advanced section of NSD */
		bus_profile.master_out_channels = (uint32_t) sd.master_channel_count();
	}

	build_session (session_path, session_name, session_template, bus_profile, false, !sd.was_new_name_edited(), domain);
}

/** This is only ever used once Ardour is already running with a session
 * loaded. The startup case is handled by StartupFSM
 */
void
ARDOUR_UI::start_session_load (bool create_new)
{
	/* deal with any existing DIRTY session now, rather than later. don't
	 * treat a non-dirty session this way, so that it stays visible
	 * as we bring up the new session dialog.
	 */

	if (_session && ARDOUR_UI::instance()->video_timeline) {
		ARDOUR_UI::instance()->video_timeline->sync_session_state();
	}

	if (_session && _session->dirty()) {
		if (unload_session (false)) {
			/* unload cancelled by user */
			return;
		}
	}

	SessionDialog* session_dialog = new SessionDialog (create_new ? SessionDialog::New : SessionDialog::Recent, string(), Config->get_default_session_parent_dir(), string(), true);
	session_dialog->signal_response().connect (sigc::bind (sigc::mem_fun (*this, &ARDOUR_UI::session_dialog_response_handler), session_dialog));
	session_dialog->set_position (WIN_POS_CENTER);
	session_dialog->present ();
}

void
ARDOUR_UI::session_dialog_response_handler (int response, SessionDialog* session_dialog)
{
	string session_name;
	string session_path;
	string template_name;
	Temporal::TimeDomain session_domain;
	bool likely_new = false;

	session_path = "";
	session_name = "";

	switch (response) {
	case RESPONSE_ACCEPT:
		break;
	default:
		return; /* back to main event loop */
	}

	session_name = session_dialog->session_name (likely_new);
	session_path = session_dialog->session_folder ();
	session_domain = session_dialog->session_domain ();

	if (nsm) {
		likely_new = true;
	}

	/* could be an archived session, so test for that and use the
	 * result if it was
	 */

	if (!likely_new) {
		int rv = ARDOUR::inflate_session (session_name, Config->get_default_session_parent_dir(), session_path, session_name);

		if (rv < 0) {
			ArdourMessageDialog msg (*session_dialog, string_compose (_("Extracting session-archive failed: %1"), inflate_error (rv)));
			msg.run ();
			return; /* back to main event loop */
		} else if (rv == 0) {
			session_dialog->set_provided_session (session_name, session_path);
		} else {

			rv = new_session_from_aaf (session_name, Config->get_default_session_parent_dir(), session_path, session_name);
			if (rv < 0) {
				ArdourMessageDialog msg (*session_dialog, _("Extracting AAF failed"));
				msg.run ();
				return; /* back to main event loop */
			} else if (rv == 0) {
				session_dialog->set_provided_session (session_name, session_path);
				/* we got a session now */
				session_dialog->hide ();
				delete_when_idle (session_dialog);
				return;
			}
		}
	}

	string::size_type suffix = session_name.find (statefile_suffix);

	if (suffix != string::npos) {
		session_name = session_name.substr (0, suffix);
	}

	/* this shouldn't happen, but we catch it just in case it does */

	if (session_name.empty()) {
		return; /* back to main event loop */
	}

	if (session_dialog->use_session_template()) {
		template_name = session_dialog->session_template_name();
		_session_is_new = true;
	}

	if (session_name[0] == G_DIR_SEPARATOR ||
#ifdef PLATFORM_WINDOWS
	    (session_name.length() > 3 && session_name[1] == ':' && session_name[2] == G_DIR_SEPARATOR)
#else
	    (session_name.length() > 2 && session_name[0] == '.' && session_name[1] == G_DIR_SEPARATOR) ||
	    (session_name.length() > 3 && session_name[0] == '.' && session_name[1] == '.' && session_name[2] == G_DIR_SEPARATOR)
#endif
		)
	{

		/* absolute path or cwd-relative path specified for session name: infer session folder
		   from what was given.
		*/

		session_path = Glib::path_get_dirname (session_name);
		session_name = Glib::path_get_basename (session_name);

	} else {

		session_path = session_dialog->session_folder();

		std::string const& illegal = Session::session_name_is_legal (session_name);

		if (!illegal.empty()) {
			ArdourMessageDialog msg (*session_dialog,
			                         string_compose (_("To ensure compatibility with various systems\n"
			                                           "session names may not contain a '%1' character"),
			                                         illegal));
			msg.run ();
			return; /* back to main event loop */
		}
	}

	if (Glib::file_test (session_path, Glib::FileTest (G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR))) {


		if (likely_new && !nsm) {

			std::string existing = Glib::build_filename (session_path, session_name);

			if (!ask_about_loading_existing_session (existing)) {
				return; /* back to main event loop */
			}
		}

		_session_is_new = false;

	} else {

		if (!likely_new) {
			ArdourMessageDialog msg (string_compose (_("There is no existing session at \"%1\""), session_path));
			msg.run ();
			return; /* back to main event loop */
		}

		std::string const& illegal = Session::session_name_is_legal (session_name);

		if (!illegal.empty()) {
			ArdourMessageDialog msg (*session_dialog, string_compose(_("To ensure compatibility with various systems\n"
			                                                           "session names may not contain a '%1' character"), illegal));
			msg.run ();
			return; /* back to main event loop */

		}

		_session_is_new = true;
	}


	/* OK, parameters provided ... good to go. */

	session_dialog->hide ();
	delete_when_idle (session_dialog);

	if (!template_name.empty() || likely_new) {

		build_session_from_dialog (*session_dialog, session_path, session_name, template_name, session_domain);

	} else {

		load_session (session_path, session_name, template_name);
	}
}

void
ARDOUR_UI::close_session()
{
	if (unload_session (true)) {
		return;
	}

	start_session_load (false);
}


/** @param snap_name Snapshot name (without .ardour suffix).
 *  @return -2 if the load failed because we are not connected to the AudioEngine.
 */
int
ARDOUR_UI::load_session (const std::string& path, const std::string& snap_name, std::string mix_template)
{
	/* load_session calls flush_pending() which allows
	 * GUI interaction and potentially loading another session
	 * (that was easy via snapshot sidebar).
	 * Recursing into load_session() from load_session() and recursive
	 * event loops causes all kind of crashes.
	 */
	assert (!session_load_in_progress);
	if (session_load_in_progress) {
		return -1;
	}
	PBD::Unwinder<bool> lsu (session_load_in_progress, true);

	int unload_status;
	bool had_session = false;

	if (_session) {
		had_session = true;

		unload_status = unload_session ();

		if (unload_status != 0) {
			hide_splash ();
			return -1;
		}
	}

	if (had_session) {
		float sr;
		SampleFormat sf;
		string pv;

		Session::get_info_from_path (Glib::build_filename (path, snap_name + statefile_suffix), sr, sf, pv);

		/* this will stop the engine if the SR is different */

		audio_midi_setup->set_desired_sample_rate (sr);

		if (!AudioEngine::instance()->running()) {
			audio_midi_setup->set_position (WIN_POS_CENTER);
			audio_midi_setup->present ();
			_engine_dialog_connection = audio_midi_setup->signal_response().connect (sigc::bind (sigc::mem_fun (*this, &ARDOUR_UI::audio_midi_setup_reconfigure_done), path, snap_name, mix_template));
			/* not done yet, but we're avoiding modal dialogs */
			return 0;
		}
	}

	return load_session_stage_two (path, snap_name, mix_template);
}

void
ARDOUR_UI::audio_midi_setup_reconfigure_done (int response, std::string path, std::string snap_name, std::string mix_template)
{
	_engine_dialog_connection.disconnect ();

	switch (response) {
	case Gtk::RESPONSE_DELETE_EVENT:
		break;
	default:
		if (!AudioEngine::instance()->running()) {
			return; // keep dialog visible, maybe try again
		}
	}

	audio_midi_setup->hide();

	(void) load_session_stage_two (path, snap_name, mix_template);
}

int
ARDOUR_UI::load_session_stage_two (const std::string& path, const std::string& snap_name, std::string mix_template)
{
	Session *new_session;
	int retval = -1;

	BootMessage (string_compose (_("Please wait while %1 loads your session"), PROGRAM_NAME));

	try {
		new_session = new Session (*AudioEngine::instance(), path, snap_name, 0, mix_template);
	}

	/* this one is special */

	catch (AudioEngine::PortRegistrationFailure const& err) {

		ArdourMessageDialog msg (err.what(),
		                         true,
		                         Gtk::MESSAGE_INFO,
		                         Gtk::BUTTONS_CLOSE);

		msg.set_title (_("Port Registration Error"));
		msg.set_secondary_text (_("Click the Close button to try again."));
		msg.set_position (Gtk::WIN_POS_CENTER);

		int response = msg.run ();
		msg.hide ();

		switch (response) {
		case RESPONSE_CANCEL:
			exit (EXIT_FAILURE);
		default:
			break;
		}
		goto out;
	}
	catch (SessionException const& e) {
		gchar* escaped_error_txt = 0;
		stringstream ss;
		dump_errors (ss, 6);
		dump_errors (cerr);
		clear_errors ();

		{
			const std::string& tmp = ss.str();
			escaped_error_txt = g_markup_escape_text (tmp.c_str(), -1);
		}

		ArdourMessageDialog msg (string_compose(
			                         _("Session \"%1 (snapshot %2)\" did not load successfully:\n%3%4%5"),
			                         path, snap_name, e.what(), ss.str().empty() ? "" : "\n\n---", escaped_error_txt),
		                         false,
		                         Gtk::MESSAGE_INFO,
		                         BUTTONS_OK);

		msg.set_title (_("Loading Error"));
		msg.set_position (Gtk::WIN_POS_CENTER);

		(void) msg.run ();
		msg.hide ();
		g_free (escaped_error_txt);

		goto out;
	}
	catch (Glib::Error const& e) {
		const std::string& glib_what = e.what();
		gchar* escaped_error_txt = 0;
		stringstream ss;
		dump_errors (ss, 6);
		dump_errors (cerr);
		clear_errors ();

		{
			const std::string& tmp = ss.str();
			escaped_error_txt = g_markup_escape_text (tmp.c_str(), -1);
		}

		ArdourMessageDialog msg (string_compose(
		                           _("Session \"%1 (snapshot %2)\" did not load successfully.\nGlib Error\nDomain: %3\nCode: %4\nWhat: %5\n%6%7"),
		                           path, snap_name,
		                           g_quark_to_string(e.domain()), e.code(), glib_what.c_str(),
		                           ss.str().empty() ? "" : "\n\n---", escaped_error_txt),
		                         true,
		                         Gtk::MESSAGE_INFO,
		                         BUTTONS_OK);

		msg.set_title (_("Loading Error"));
		msg.set_position (Gtk::WIN_POS_CENTER);

		(void) msg.run ();
		msg.hide ();
		g_free (escaped_error_txt);

		goto out;
	}
	catch (...) {
		gchar* escaped_error_txt = 0;
		stringstream ss;
		dump_errors (ss, 6);
		dump_errors (cerr);
		clear_errors ();

		{
			const std::string& tmp = ss.str();
			escaped_error_txt = g_markup_escape_text (tmp.c_str(), -1);
		}

		ArdourMessageDialog msg (string_compose(
		                           _("Session \"%1 (snapshot %2)\" did not load successfully.%3%4"),
		                           path, snap_name, ss.str().empty() ? "" : "\n\n---", escaped_error_txt),
		                         true,
		                         Gtk::MESSAGE_INFO,
		                         BUTTONS_OK);

		msg.set_title (_("Loading Error"));
		msg.set_position (Gtk::WIN_POS_CENTER);

		(void) msg.run ();
		msg.hide ();
		g_free (escaped_error_txt);

		goto out;
	}

	if (new_session->had_destructive_tracks()) {
		ArdourMessageDialog msg (string_compose (_("This session (from an older version of %1) used at least\none \"tape track\" (aka \"destructive recording\".\n\n"
		                                           "This is no longer supported by the program. The tape track(s) have been setup as normal tracks.\n\n"
		                                           "If you need to continue using tape tracks/destructive recording\n"
		                                           "please use an older version of %1 to work on this session"), PROGRAM_NAME),

		                         true,
		                         Gtk::MESSAGE_INFO,
		                         BUTTONS_OK);

		msg.set_title (_("Tape Tracks No Longer Supported"));
		msg.set_position (Gtk::WIN_POS_CENTER);
		(void) msg.run ();
		msg.hide ();
	}

	{
		list<string> const u = new_session->missing_filesources (DataType::MIDI);
		if (!u.empty()) {
			MissingFileSourceDialog d (_main_window, _session, u, DataType::MIDI);
			d.run ();
		}
	}
	{
		list<string> const u = new_session->unknown_processors ();
		bool scan_now = false;
		if (!u.empty()) {
			MissingPluginDialog d (_main_window, _session, u, PluginManager::instance ().cache_valid ());
			if (d.run () == RESPONSE_YES) {
				scan_now = true;
			}
		}
		if (scan_now) {
			PluginScanDialog psd (false, true);
			psd.start ();
		}
		if (!u.empty()) {
			if (scan_now || UIConfiguration::instance().get_show_manager_if_plugins_are_missing ()) {
				show_plugin_manager ();
			}
		}
	}

	if (!new_session->writable()) {
		ArdourMessageDialog msg (_("This session has been opened in read-only mode.\n\nYou will not be able to record or save."),
		                         true,
		                         Gtk::MESSAGE_INFO,
		                         BUTTONS_OK);

		msg.set_title (_("Read-only Session"));
		msg.set_position (Gtk::WIN_POS_CENTER);
		(void) msg.run ();
		msg.hide ();
	}


	/* Now the session been created, add the transport controls */
	new_session->add_controllable(roll_controllable);
	new_session->add_controllable(stop_controllable);
	new_session->add_controllable(goto_start_controllable);
	new_session->add_controllable(goto_end_controllable);
	new_session->add_controllable(auto_loop_controllable);
	new_session->add_controllable(play_selection_controllable);
	new_session->add_controllable(rec_controllable);

	set_session (new_session);

	if (_session) {
		_session->set_clean ();
	}

	{
		Timers::TimerSuspender t;
		flush_pending (10);
	}

	retval = 0;

	if (!mix_template.empty ()) {
		/* if mix_template is given, assume this is a new session */
		string metascript = Glib::build_filename (mix_template, "template.lua");
		meta_session_setup (metascript);
	}


  out:
	/* For successful session load the splash is hidden by ARDOUR_UI::first_idle,
	 * which is queued by set_session().
	 * If session-loading fails we hide it explicitly.
	 * This covers both cases in a central place.
	 */
	if (retval) {
		hide_splash ();
	}
	return retval;
}

int
ARDOUR_UI::build_session (const std::string& path, const std::string& snap_name, const std::string& session_template, BusProfile const& bus_profile, bool from_startup_fsm, bool unnamed, Temporal::TimeDomain domain)
{
	int x;

	x = unload_session ();

	if (x < 0) {
		return -1;
	} else if (x > 0) {
		return 0;
	}

	_session_is_new = true;

	/* when running from startup FSM all is fine,
	 * engine should be running and the FSM will also have
	 * asked for the SR (even if try-autostart-engine is set)
	 */
	if (from_startup_fsm && AudioEngine::instance()->running ()) {
		return build_session_stage_two (path, snap_name, session_template, bus_profile, unnamed, domain);
	}
	/* Sample-rate cannot be changed when JACK is running */
	if (!ARDOUR::AudioEngine::instance()->setup_required () && AudioEngine::instance()->running ()) {
		return build_session_stage_two (path, snap_name, session_template, bus_profile, unnamed, domain);
	}

	/* Work-around missing "OK" button:
	 * When the engine is running. The way to proceed w/o engine re-start
	 * is to simply close the dialog. This is not obvious.
	 *
	 * Ideally an engine restart should be avoided since it can invalidate
	 * latency-calibration.
	 */
	ARDOUR::AudioEngine::instance()->stop();

	/* Ask for the Sample-rate to use with the new session */
	audio_midi_setup->set_position (WIN_POS_CENTER);
	audio_midi_setup->set_modal ();
	audio_midi_setup->present ();
	_engine_dialog_connection = audio_midi_setup->signal_response().connect (boost::bind (&ARDOUR_UI::audio_midi_setup_for_new_session_done, this, _1, path, snap_name, session_template, bus_profile, unnamed, domain));

	/* not done yet, but we're avoiding modal dialogs */
	return 0;
}


void
ARDOUR_UI::audio_midi_setup_for_new_session_done (int response, std::string path, std::string snap_name, std::string template_name, BusProfile const& bus_profile, bool unnamed, Temporal::TimeDomain domain)
{
	_engine_dialog_connection.disconnect ();

	switch (response) {
		case Gtk::RESPONSE_DELETE_EVENT:
			audio_midi_setup->set_modal (false);
			break;
		default:
			break;
	}

	if (!AudioEngine::instance()->running()) {
		return; // keep dialog visible, maybe try again
	}
	audio_midi_setup->set_modal (false);
	audio_midi_setup->hide();

	build_session_stage_two (path, snap_name, template_name, bus_profile, unnamed, domain);
}

int
ARDOUR_UI::build_session_stage_two (std::string const& path, std::string const& snap_name, std::string const& session_template, BusProfile const& bus_profile, bool unnamed, Temporal::TimeDomain domain, samplecnt_t samplerate)
{
	Session* new_session;

	bool meta_session = !session_template.empty() && session_template.substr (0, 11) == "urn:ardour:";

	try {
		new_session = new Session (*AudioEngine::instance(), path, snap_name, bus_profile.master_out_channels > 0 ? &bus_profile : NULL, meta_session ? "" : session_template, unnamed, samplerate);
	}
	catch (SessionException const& e) {
		gchar* escaped_error_txt = 0;
		stringstream ss;
		dump_errors (ss, 6);
		cerr << "Here are the errors associated with this failed session:\n";
		dump_errors (cerr);
		cerr << "---------\n";
		clear_errors ();

		{
			const std::string& tmp = ss.str();
			escaped_error_txt = g_markup_escape_text (tmp.c_str(), -1);
		}

		ArdourMessageDialog msg (string_compose(_("Could not create session in \"%1\": %2%3%4"), path, e.what(), ss.str().empty() ? "" : "\n\n---", escaped_error_txt));
		msg.set_title (_("Loading Error"));
		msg.set_position (Gtk::WIN_POS_CENTER);
		msg.run ();
		g_free (escaped_error_txt);
		return -1;
	}
	catch (Glib::Error const& e) {
		const std::string& glib_what = e.what();
		gchar* escaped_error_txt = 0;
		stringstream ss;
		dump_errors (ss, 6);
		dump_errors (cerr);
		clear_errors ();

		{
			const std::string& tmp = ss.str();
			escaped_error_txt = g_markup_escape_text (tmp.c_str(), -1);
		}

		ArdourMessageDialog msg (string_compose(
		                           _("Could not create session in \"%1\".\n\nGlib Error\nDomain: %2\nCode: %3\nWhat: %4\n%5%6"),
		                           path,
		                           g_quark_to_string(e.domain()), e.code(), glib_what.c_str(),
		                           ss.str().empty() ? "" : "\n\n---", escaped_error_txt));
		msg.set_title (_("Loading Error"));
		msg.set_position (Gtk::WIN_POS_CENTER);
		msg.run ();
		g_free (escaped_error_txt);
		return -1;
	}
	catch (...) {
		gchar* escaped_error_txt = 0;
		stringstream ss;
		dump_errors (ss, 6);
		cerr << "Here are the errors associated with this failed session:\n";
		dump_errors (cerr);
		cerr << "---------\n";
		clear_errors ();

		{
			const std::string& tmp = ss.str();
			escaped_error_txt = g_markup_escape_text (tmp.c_str(), -1);
		}

		ArdourMessageDialog msg (string_compose(_("Could not create session in \"%1\"%2%3"), path, ss.str().empty() ? "" : "\n\n---", escaped_error_txt));
		msg.set_title (_("Loading Error"));
		msg.set_position (Gtk::WIN_POS_CENTER);
		msg.run ();
		g_free (escaped_error_txt);
		return -1;
	}

	/* Give the new session the default GUI state, if such things exist */

	XMLNode* n;
	n = Config->instant_xml (X_("Editor"));
	if (n) {
		n->remove_nodes_and_delete ("Selection"); // no not apply selection to new sessions.
		new_session->add_instant_xml (*n, false);
	}
	n = Config->instant_xml (X_("Mixer"));
	if (n) {
		new_session->add_instant_xml (*n, false);
	}

	n = Config->instant_xml (X_("Preferences"));
	if (n) {
		new_session->add_instant_xml (*n, false);
	}

	/* Put the playhead at 0 and scroll fully left */
	n = new_session->instant_xml (X_("Editor"));
	if (n) {
		n->set_property (X_("playhead"), X_("0"));
		n->set_property (X_("left-frame"), X_("0"));
	}

	new_session->config.set_default_time_domain(domain);

	set_session (new_session);

	new_session->save_state(new_session->name());

	if (meta_session) {
		meta_session_setup (session_template.substr (11));
	}

	return 0;
}

/** Ask the user for the name of a new snapshot and then take it.
 */

void
ARDOUR_UI::snapshot_session (bool switch_to_it)
{
	if (switch_to_it && _session->dirty()) {
		vector<string> actions;
		actions.push_back (_("Abort saving snapshot"));
		actions.push_back (_("Don't save now, just snapshot"));
		actions.push_back (_("Save it first"));
		switch (ask_about_saving_session(actions)) {
			case -1:
				return;
				break;
			case 1:
				if (save_state_canfail ("")) {
					ArdourMessageDialog msg (_main_window,
							string_compose (_("\
%1 was unable to save your session.\n\n\
If you still wish to proceed, please use the\n\n\
\"Don't save now\" option."), PROGRAM_NAME));
					msg.run ();
					return;
				}
				/* fallthrough */
			case 0:
				_session->remove_pending_capture_state ();
				break;
		}
	}

	Prompter prompter (true);
	prompter.set_name ("Prompter");
	prompter.add_button (Gtk::Stock::SAVE, Gtk::RESPONSE_ACCEPT);
	if (switch_to_it) {
		prompter.set_title (_("Snapshot and switch"));
		prompter.set_prompt (_("New session name"));
	} else {
		prompter.set_title (_("Take Snapshot"));
		prompter.set_prompt (_("Name of new snapshot"));
	}

	if (switch_to_it) {
		prompter.set_initial_text (_session->snap_name());
	} else {
		Glib::DateTime tm (g_date_time_new_now_local ());
		prompter.set_initial_text (tm.format ("%FT%H.%M.%S"));
	}

	bool finished = false;
	while (!finished) {
		switch (prompter.run()) {
		case RESPONSE_ACCEPT:
		{
			finished = process_snapshot_session_prompter (prompter, switch_to_it);
			break;
		}

		default:
			finished = true;
			break;
		}
	}
}

/** Ask the user for a new session name and then rename the session to it.
 */

void
ARDOUR_UI::rename_session (bool for_unnamed)
{
	if (!_session) {
		return;
	}

	Prompter prompter (true, false);
	string name;

	prompter.set_name ("Prompter");

	prompter.add_button (Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
	prompter.add_button (Gtk::Stock::SAVE, Gtk::RESPONSE_ACCEPT);

	if (for_unnamed) {
		prompter.set_title (_("Name Session"));
		prompter.set_prompt (_("Session name"));
	} else {
		prompter.set_title (_("Rename Session"));
		prompter.set_prompt (_("New session name"));
	}

  again:
	switch (prompter.run()) {
	case RESPONSE_ACCEPT:
	{
		prompter.get_result (name);

		bool do_rename = (name.length() != 0);

		if (do_rename) {
			std::string const& illegal = Session::session_name_is_legal (name);

			if (!illegal.empty()) {
				ArdourMessageDialog msg (string_compose (_("To ensure compatibility with various systems\n"
				                                     "session names may not contain a '%1' character"), illegal));
				msg.run ();
				goto again;
			}

			switch (_session->rename (name)) {
			case -1: {
				ArdourMessageDialog msg (_("That name is already in use by another directory/folder. Please try again."));
				msg.run ();
				goto again;
				break;
			}
			case 0:
				break;
			default: {
				ArdourMessageDialog msg (_("Renaming this session failed.\nThings could be seriously messed up at this point"));
				msg.run ();
				break;
			}
			}
		}

		break;
	}

	default:
		break;
	}
}

bool
ARDOUR_UI::save_as_progress_update (float fraction, int64_t cnt, int64_t total, Gtk::Label* label, Gtk::ProgressBar* bar)
{
	char buf[256];

	snprintf (buf, sizeof (buf), _("Copied %" PRId64 " of %" PRId64), cnt, total);

	label->set_text (buf);
	bar->set_fraction (fraction);

	/* process events, redraws, etc. */

	while (gtk_events_pending()) {
		gtk_main_iteration ();
	}

	return true; /* continue with save-as */
}

void
ARDOUR_UI::save_session_as ()
{
	if (!_session) {
		return;
	}

	if (_session->unnamed()) {
		save_state ("", false);
		return;
	}

	if (_session->dirty()) {
		vector<string> actions;
		actions.push_back (_("Abort save-as"));
		actions.push_back (_("Don't save now, just save-as"));
		actions.push_back (_("Save it first"));
		switch (ask_about_saving_session(actions)) {
			case -1:
				return;
				break;
			case 1:
				if (save_state_canfail ("")) {
					ArdourMessageDialog msg (_main_window,
							string_compose (_("\
%1 was unable to save your session.\n\n\
If you still wish to proceed, please use the\n\n\
\"Don't save now\" option."), PROGRAM_NAME));
					msg.run ();
					return;
				}
				/* fallthrough */
			case 0:
				_session->remove_pending_capture_state ();
				break;
		}
	}

	if (!save_as_dialog) {
		save_as_dialog = new SaveAsDialog;
	}

	save_as_dialog->set_name (_session->name());

	int response = save_as_dialog->run ();

	save_as_dialog->hide ();

	switch (response) {
		case Gtk::RESPONSE_OK:
			break;
		default:
			return;
	}


	Session::SaveAs sa;

	sa.new_parent_folder = save_as_dialog->new_parent_folder ();
	sa.new_name = save_as_dialog->new_name ();
	sa.switch_to = save_as_dialog->switch_to();
	sa.copy_media = save_as_dialog->copy_media();
	sa.copy_external = save_as_dialog->copy_external();
	sa.include_media = save_as_dialog->include_media ();

	/* Only bother with a progress dialog if we're going to copy
	   media into the save-as target. Without that choice, this
	   will be very fast because we're only talking about a few kB's to
	   perhaps a couple of MB's of data.
	*/

	ArdourDialog progress_dialog (_("Save As"), true);
	ScopedConnection c;

	if (sa.include_media && sa.copy_media) {

		Gtk::Label* label = manage (new Gtk::Label());
		Gtk::ProgressBar* progress_bar = manage (new Gtk::ProgressBar ());

		progress_dialog.get_vbox()->pack_start (*label);
		progress_dialog.get_vbox()->pack_start (*progress_bar);
		label->show ();
		progress_bar->show ();

		/* this signal will be emitted from within this, the calling thread,
		 * after every file is copied. It provides information on percentage
		 * complete (in terms of total data to copy), the number of files
		 * copied so far, and the total number to copy.
		 */

		sa.Progress.connect_same_thread (c, boost::bind (&ARDOUR_UI::save_as_progress_update, this, _1, _2, _3, label, progress_bar));

		progress_dialog.show_all ();
		progress_dialog.present ();
	}

	if (_session->save_as (sa)) {
		/* ERROR MESSAGE */
		ArdourMessageDialog msg (string_compose (_("Save As failed: %1"), sa.failure_message));
		msg.run ();
	}

	/* the logic here may seem odd: why isn't the condition sa.switch_to ?
	 * the trick is this: if the new session was copy with media included,
	 * then Session::save_as() will have already done a neat trick to avoid
	 * us having to unload and load the new state. But if the media was not
	 * included, then this is required (it avoids us having to otherwise
	 * drop all references to media (sources).
	 */

	if (!sa.include_media && sa.switch_to) {
		unload_session (false);
		load_session (sa.final_session_folder_name, sa.new_name);
	}
}

void
ARDOUR_UI::archive_session ()
{
	if (!_session) {
		return;
	}

	Glib::DateTime gdt (Glib::DateTime::create_now_local ());

	SessionArchiveDialog sad;
	sad.set_name (_session->name() + gdt.format ("_%F_%H%M%S"));
	int response = sad.run ();

	if (response != Gtk::RESPONSE_OK) {
		sad.hide ();
		return;
	}

	if (_session->archive_session (sad.target_folder(), sad.name(), sad.encode_option (), sad.compression_level (), sad.only_used_sources (), &sad)) {
		ArdourMessageDialog msg (_("Session Archiving failed."));
		msg.run ();
	}
}

void
ARDOUR_UI::quick_snapshot_session (bool switch_to_it)
{
	if (switch_to_it && _session->dirty ()) {
		save_state_canfail ("");
	}

	save_state (Glib::DateTime::create_now_local().format ("%FT%H.%M.%S"), switch_to_it);
}


bool
ARDOUR_UI::process_snapshot_session_prompter (Prompter& prompter, bool switch_to_it)
{
	string snapname;

	prompter.get_result (snapname);

	bool do_save = (snapname.length() != 0);

	if (do_save) {
		std::string const& illegal = Session::session_name_is_legal (snapname);
		if (!illegal.empty()) {
			ArdourMessageDialog msg (string_compose (_("To ensure compatibility with various systems\n"
			                                           "snapshot names may not contain a '%1' character"), illegal));
			msg.run ();
			return false;
		}
	}

	vector<std::string> n = Session::possible_states (_session->session_directory().root_path());

	if (find (n.begin(), n.end(), snapname) != n.end()) {

		do_save = overwrite_file_dialog (prompter,
						 _("Confirm Snapshot Overwrite"),
						 _("A snapshot already exists with that name. Do you want to overwrite it?"));
	}

	if (do_save) {
		save_state (snapname, switch_to_it);
	}
	else {
		return false;
	}

	return true;
}


void
ARDOUR_UI::open_session ()
{
	if (!check_audioengine (_main_window)) {
		return;
	}

	SessionDialog* session_dialog = new SessionDialog (SessionDialog::Open, string(), Config->get_default_session_parent_dir(), string(), true);
	session_dialog->signal_response().connect (sigc::bind (sigc::mem_fun (*this, &ARDOUR_UI::session_dialog_response_handler), session_dialog));
	session_dialog->present ();
}

void
ARDOUR_UI::open_recent_session ()
{
	SessionDialog* session_dialog = new SessionDialog (SessionDialog::Recent, string(), Config->get_default_session_parent_dir(), string(), true);
	session_dialog->signal_response().connect (sigc::bind (sigc::mem_fun (*this, &ARDOUR_UI::session_dialog_response_handler), session_dialog));
	session_dialog->present ();
}

int
ARDOUR_UI::ask_about_saving_session (const vector<string>& actions)
{
	ArdourDialog window (_("Unsaved Session"));
	Gtk::HBox dhbox;  // the hbox for the image and text
	Gtk::Label  prompt_label;
	Gtk::Image* dimage = manage (new Gtk::Image(Stock::DIALOG_WARNING,  Gtk::ICON_SIZE_DIALOG));

	string msg;

	assert (actions.size() >= 3);

	window.add_button (actions[0], RESPONSE_REJECT);
	window.add_button (actions[1], RESPONSE_APPLY);
	window.add_button (actions[2], RESPONSE_ACCEPT);

	window.set_default_response (RESPONSE_ACCEPT);
	window.set_keep_above (true);

	Gtk::Button noquit_button (msg);
	noquit_button.set_name ("EditorGTKButton");

	string prompt;

	if (_session->snap_name() == _session->name()) {
		prompt = string_compose(_("The session \"%1\"\nhas not been saved.\n\nAny changes made this time\nwill be lost unless you save it.\n\nWhat do you want to do?"),
					_session->snap_name());
	} else {
		prompt = string_compose(_("The snapshot \"%1\"\nhas not been saved.\n\nAny changes made this time\nwill be lost unless you save it.\n\nWhat do you want to do?"),
					_session->snap_name());
	}

	prompt_label.set_text (prompt);
	prompt_label.set_name (X_("PrompterLabel"));
	prompt_label.set_alignment(ALIGN_START, ALIGN_START);

	dimage->set_alignment(ALIGN_CENTER, ALIGN_START);
	dhbox.set_homogeneous (false);
	dhbox.pack_start (*dimage, false, false, 5);
	dhbox.pack_start (prompt_label, true, false, 5);
	window.get_vbox()->pack_start (dhbox);

	window.set_name (_("Prompter"));
	window.set_modal (true);
	window.set_resizable (false);

	dhbox.show();
	prompt_label.show();
	dimage->show();
	window.show();
	window.present ();

	ResponseType r = (ResponseType) window.run();

	window.hide ();

	switch (r) {
	case RESPONSE_ACCEPT: // save and get out of here
		return 1;
	case RESPONSE_APPLY:  // get out of here
		return 0;
	default:
		break;
	}

	return -1;
}


void
ARDOUR_UI::save_session_at_its_request (std::string snapshot_name)
{
	if (_session) {
		_session->save_state (snapshot_name, true);
	}
}

gint
ARDOUR_UI::autosave_session ()
{
	if (g_main_depth() > 1) {
		/* inside a recursive main loop,
		   give up because we may not be able to
		   take a lock.
		*/
		return 1;
	}

	if (!Config->get_periodic_safety_backups()) {
		return 1;
	}

	if (_session) {
		_session->maybe_write_autosave();
	}

	return 1;
}