glib/gio/gapplication.c

/*
 * Copyright © 2010 Codethink Limited
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2 of the licence or (at
 * your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Authors: Ryan Lortie <desrt@desrt.ca>
 */

/* Prologue {{{1 */
#include "gapplication.h"

#include "gapplicationcommandline.h"
#include "gapplicationimpl.h"

#include "gioenumtypes.h"
#include "gio-marshal.h"
#include "gioenums.h"
#include "gfile.h"

#include <string.h>

struct _GApplicationPrivate
{
  GApplicationFlags  flags;
  gchar             *id;

  GHashTable        *actions; /* string -> GApplicationAction */
  GMainLoop         *mainloop;

  guint              inactivity_timeout_id;
  guint              inactivity_timeout;
  guint              use_count;

  guint              is_registered : 1;
  guint              is_remote : 1;

  GApplicationImpl  *impl;
};

enum
{
  PROP_NONE,
  PROP_APPLICATION_ID,
  PROP_FLAGS,
  PROP_IS_REGISTERED,
  PROP_IS_REMOTE,
  PROP_INACTIVITY_TIMEOUT
};

enum
{
  SIGNAL_STARTUP,
  SIGNAL_ACTIVATE,
  SIGNAL_OPEN,
  SIGNAL_ACTION,
  SIGNAL_COMMAND_LINE,
  NR_SIGNALS
};

static guint g_application_signals[NR_SIGNALS];

G_DEFINE_TYPE (GApplication, g_application, G_TYPE_OBJECT)

/* vfunc defaults {{{1 */
static void
g_application_real_before_emit (GApplication *application,
                                GVariant     *platform_data)
{
}

static void
g_application_real_after_emit (GApplication *application,
                               GVariant     *platform_data)
{
}

static void
g_application_real_startup (GApplication *application)
{
}

static void
g_application_real_activate (GApplication *application)
{
  if (!g_signal_has_handler_pending (application,
                                     g_application_signals[SIGNAL_ACTIVATE],
                                     0, TRUE))
    {
      static gboolean warned;

      if (warned)
        return;

      g_warning ("Your application does not implement "
                 "g_application_activate() and has no handlers connected "
                 "to the 'activate' signal.  It should do one of these.");
      warned = TRUE;
    }
}

static void
g_application_real_open (GApplication  *application,
                         GFile        **files,
                         gint           n_files,
                         const gchar   *hint)
{
  if (!g_signal_has_handler_pending (application,
                                     g_application_signals[SIGNAL_OPEN],
                                     0, TRUE))
    {
      static gboolean warned;

      if (warned)
        return;

      g_warning ("Your application claims to support opening files "
                 "but does not implement g_application_open() and has no "
                 "handlers connected to the 'open' signal.");
      warned = TRUE;
    }
}

static int
g_application_real_command_line (GApplication            *application,
                                 GApplicationCommandLine *cmdline)
{
  static gboolean warned;

  if (warned) 
    return 1;

  g_warning ("Your application claims to support custom command line "
             "handling but does not implement g_application_command_line() "
             "and has no handlers connected to the 'command-line' signal.");

  warned = TRUE;

  return 1;
}

static gboolean
g_application_real_local_command_line (GApplication  *application,
                                       GVariant     **arguments,
                                       int           *exit_status)
{
  if (application->priv->flags & G_APPLICATION_HANDLES_COMMAND_LINE)
    return FALSE;

  else
    {
      GError *error = NULL;
      gint n_args;

      if (!g_application_register (application, NULL, &error))
        {
          g_critical ("%s", error->message);
          g_error_free (error);
          *exit_status = 1;
          return TRUE;
        }

      n_args = g_variant_n_children (*arguments);

      if (application->priv->flags & G_APPLICATION_IS_SERVICE)
        {
          if (n_args > 1)
            {
              g_printerr ("GApplication service mode takes no arguments.\n");
              application->priv->flags &= ~G_APPLICATION_IS_SERVICE;
            }

          return TRUE;
        }

      if (n_args <= 1)
        {
          g_application_activate (application);
          *exit_status = 0;
        }

      else
        {
          if (~application->priv->flags & G_APPLICATION_HANDLES_OPEN)
            {
              g_critical ("This application can not open files.");
              *exit_status = 1;
            }
          else
            {
              GFile **files;
              gint n_files;
              gint i;

              n_files = n_args - 1;
              files = g_new (GFile *, n_files);

              for (i = 0; i < n_files; i++)
                {
                  const gchar *arg;

                  g_variant_get_child (*arguments, i + 1, "^&ay", &arg);
                  files[i] = g_file_new_for_commandline_arg (arg);
                }

              g_application_open (application, files, n_files, "");

              for (i = 0; i < n_files; i++)
                g_object_unref (files[i]);
              g_free (files);

              *exit_status = 0;
            }
        }

      return TRUE;
    }
}

static void
g_application_real_add_platform_data (GApplication    *application,
                                      GVariantBuilder *builder)
{
}

static void
g_application_real_quit_mainloop (GApplication *application)
{
  if (application->priv->mainloop != NULL)
    g_main_loop_quit (application->priv->mainloop);
}

static void
g_application_real_run_mainloop (GApplication *application)
{
  if (application->priv->mainloop == NULL)
    application->priv->mainloop = g_main_loop_new (NULL, FALSE);

  g_main_loop_run (application->priv->mainloop);
}

/* GObject implementation stuff {{{1 */
static void
g_application_set_property (GObject *object, guint prop_id,
                            const GValue *value, GParamSpec *pspec)
{
  GApplication *application = G_APPLICATION (object);

  switch (prop_id)
    {
    case PROP_APPLICATION_ID:
      g_application_set_application_id (application,
                                        g_value_get_string (value));
      break;

    case PROP_FLAGS:
      g_application_set_flags (application, g_value_get_flags (value));
      break;

    case PROP_INACTIVITY_TIMEOUT:
      g_application_set_inactivity_timeout (application,
                                            g_value_get_uint (value));
      break;

    default:
      g_assert_not_reached ();
    }
}

static void
g_application_get_property (GObject *object, guint prop_id,
                            GValue *value, GParamSpec *pspec)
{
  GApplication *application = G_APPLICATION (object);

  switch (prop_id)
    {
    case PROP_APPLICATION_ID:
      g_value_set_string (value,
                          g_application_get_application_id (application));
      break;

    case PROP_FLAGS:
      g_value_set_flags (value,
                         g_application_get_flags (application));
      break;

    case PROP_IS_REGISTERED:
      g_value_set_boolean (value,
                           g_application_get_is_registered (application));
      break;

    case PROP_IS_REMOTE:
      g_value_set_boolean (value,
                           g_application_get_is_remote (application));
      break;

    case PROP_INACTIVITY_TIMEOUT:
      g_value_set_uint (value,
                        g_application_get_inactivity_timeout (application));
      break;

    default:
      g_assert_not_reached ();
    }
}

static void
g_application_constructed (GObject *object)
{
  GApplication *application = G_APPLICATION (object);

  g_assert (application->priv->id != NULL);
}

static void
g_application_finalize (GObject *object)
{
  GApplication *application = G_APPLICATION (object);

  if (application->priv->impl)
    g_application_impl_destroy (application->priv->impl);
  g_free (application->priv->id);

  if (application->priv->mainloop)
    g_main_loop_unref (application->priv->mainloop);

  G_OBJECT_CLASS (g_application_parent_class)
    ->finalize (object);
}

static void
g_application_init (GApplication *application)
{
  application->priv = G_TYPE_INSTANCE_GET_PRIVATE (application,
                                                   G_TYPE_APPLICATION,
                                                   GApplicationPrivate);
}

static gboolean
first_wins_accumulator (GSignalInvocationHint *ihint,
                        GValue                *return_accu,
                        const GValue          *handler_return,
                        gpointer               data)
{
  g_value_copy (handler_return, return_accu);

  return FALSE;
}

static void
g_application_class_init (GApplicationClass *class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);

  object_class->constructed = g_application_constructed;
  object_class->finalize = g_application_finalize;
  object_class->get_property = g_application_get_property;
  object_class->set_property = g_application_set_property;

  class->before_emit = g_application_real_before_emit;
  class->after_emit = g_application_real_after_emit;
  class->startup = g_application_real_startup;
  class->activate = g_application_real_activate;
  class->open = g_application_real_open;
  class->command_line = g_application_real_command_line;
  class->local_command_line = g_application_real_local_command_line;
  class->add_platform_data = g_application_real_add_platform_data;
  class->quit_mainloop = g_application_real_quit_mainloop;
  class->run_mainloop = g_application_real_run_mainloop;

  g_object_class_install_property (object_class, PROP_APPLICATION_ID,
    g_param_spec_string ("application-id", "application identifier",
                         "Unique identifier for the application",
                         NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
                         G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (object_class, PROP_FLAGS,
    g_param_spec_flags ("flags", "application flags",
                        "Flags specifying the behaviour of the application",
                         G_TYPE_APPLICATION_FLAGS, G_APPLICATION_FLAGS_NONE,
                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (object_class, PROP_IS_REGISTERED,
    g_param_spec_boolean ("is-registered", "is registered",
                          "If g_application_register() has been called",
                          FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (object_class, PROP_IS_REMOTE,
    g_param_spec_boolean ("is-remote", "is remote",
                          "If this application instance is remote",
                          FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (object_class, PROP_INACTIVITY_TIMEOUT,
    g_param_spec_boolean ("inactivity-timeout", "inactivity timeout",
                          "time (ms) to stay alive after becoming idle",
                          0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));


  g_application_signals[SIGNAL_STARTUP] =
    g_signal_new ("startup", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GApplicationClass, startup),
                  NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);

  g_application_signals[SIGNAL_ACTIVATE] =
    g_signal_new ("activate", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GApplicationClass, activate),
                  NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);

  g_application_signals[SIGNAL_OPEN] =
    g_signal_new ("open", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GApplicationClass, open),
                  NULL, NULL, _gio_marshal_VOID__POINTER_INT_STRING,
                  G_TYPE_NONE, 3, G_TYPE_POINTER, G_TYPE_INT, G_TYPE_STRING);

  g_application_signals[SIGNAL_COMMAND_LINE] =
    g_signal_new ("command-line", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (GApplicationClass, command_line),
                  first_wins_accumulator, NULL, _gio_marshal_INT__OBJECT,
                  G_TYPE_INT, 1, G_TYPE_APPLICATION_COMMAND_LINE);

  g_type_class_add_private (class, sizeof (GApplicationPrivate));
}

static GVariant *
get_platform_data (GApplication *application)
{
  GVariantBuilder *builder;
  GVariant *result;

  builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));

  {
    gchar *cwd = g_get_current_dir ();
    g_variant_builder_add (builder, "{sv}", "cwd",
                           g_variant_new_bytestring (cwd));
    g_free (cwd);
  }

  G_APPLICATION_GET_CLASS (application)->
    add_platform_data (application, builder);

  result = g_variant_builder_end (builder);
  g_variant_builder_unref (builder);

  return result;
}

/* Application ID validity {{{1 */

/**
 * g_application_id_is_valid:
 * @application_id: a potential application identifier
 * @returns: %TRUE if @application_id is valid
 *
 * Checks if @application_id is a valid application ID.  A valid ID is
 * required for calls to g_application_new() and
 * g_application_set_application_id().
 **/
gboolean
g_application_id_is_valid (const gchar *application_id)
{
  gboolean allow_dot;

  if (strlen (application_id) > 255)
    return FALSE;

  if (!g_ascii_isalpha (*application_id))
    return FALSE;

  application_id++;
  allow_dot = FALSE;
  for (; *application_id; application_id++)
    {
      if (g_ascii_isalnum (*application_id) ||
          (*application_id == '-') ||
          (*application_id == '_'))
        allow_dot = TRUE;
      else if (allow_dot && *application_id == '.')
        allow_dot = FALSE;
      else
        return FALSE;
    }

  return TRUE;
}

/* Public Constructor {{{1 */
/**
 * g_application_new:
 * @application_id: the application id
 * @flags: the application flags
 * @returns: a new #GApplication instance
 *
 * Creates a new #GApplication instance.
 *
 * This function calls g_type_init() for you.
 *
 * The application id must be valid.  See g_application_id_is_valid().
 **/
GApplication *
g_application_new (const gchar       *application_id,
                   GApplicationFlags  flags)
{
  g_return_val_if_fail (g_application_id_is_valid (application_id), NULL);

  g_type_init ();

  return g_object_new (G_TYPE_APPLICATION,
                       "application-id", application_id,
                       "flags", flags,
                       NULL);
}

/* Simple get/set: application id, flags, inactivity timeout {{{1 */
/**
 * g_application_get_application_id:
 * @application: a #GApplication
 * @returns: the identifier for @application, owned by @application
 *
 * Gets the unique identifier for @application.
 *
 * Since: 2.28
 **/
const gchar *
g_application_get_application_id (GApplication *application)
{
  g_return_val_if_fail (G_IS_APPLICATION (application), NULL);

  return application->priv->id;
}

/**
 * g_application_set_application_id:
 * @application: a #GApplication
 * @application_id: the identifier for @application
 *
 * Sets the unique identifier for @application.
 *
 * The application id can only be modified if @application has not yet
 * been registered.
 *
 * The application id must be valid.  See g_application_id_is_valid().
 *
 * Since: 2.28
 **/
void
g_application_set_application_id (GApplication *application,
                                  const gchar  *application_id)
{
  g_return_if_fail (G_IS_APPLICATION (application));

  if (g_strcmp0 (application->priv->id, application_id) != 0)
    {
      g_return_if_fail (g_application_id_is_valid (application_id));
      g_return_if_fail (!application->priv->is_registered);

      g_free (application->priv->id);
      application->priv->id = g_strdup (application_id);

      g_object_notify (G_OBJECT (application), "application-id");
    }
}

/**
 * g_application_get_flags:
 * @application: a #GApplication
 * @returns: the flags for @application
 *
 * Gets the flags for @application.
 *
 * See #GApplicationFlags.
 *
 * Since: 2.28
 **/
GApplicationFlags
g_application_get_flags (GApplication *application)
{
  g_return_val_if_fail (G_IS_APPLICATION (application), 0);

  return application->priv->flags;
}

/**
 * g_application_set_flags:
 * @application: a #GApplication
 * @flags: the flags for @application
 *
 * Sets the flags for @application.
 *
 * The flags can only be modified if @application has not yet been
 * registered.
 *
 * See #GApplicationFlags.
 *
 * Since: 2.28
 **/
void
g_application_set_flags (GApplication      *application,
                         GApplicationFlags  flags)
{
  g_return_if_fail (G_IS_APPLICATION (application));

  if (application->priv->flags != flags)
    {
      g_return_if_fail (!application->priv->is_registered);

      application->priv->flags = flags;

      g_object_notify (G_OBJECT (application), "flags");
    }
}

/**
 * g_application_get_inactivity_timeout:
 * @application: a #GApplication
 *
 * Gets the current inactivity timeout for the application.
 *
 * This is the amount of time (in milliseconds) after the last call to
 * g_application_release() before the application stops running.
 *
 * Returns: the timeout, in milliseconds
 *
 * Since: 2.28
 **/
guint
g_application_get_inactivity_timeout (GApplication *application)
{
  g_return_val_if_fail (G_IS_APPLICATION (application), 0);

  return application->priv->inactivity_timeout;
}

/**
 * g_application_set_inactivity_timeout:
 * @application: a #GApplication
 * @inactivity_timeout: the timeout, in milliseconds
 *
 * Sets the current inactivity timeout for the application.
 *
 * This is the amount of time (in milliseconds) after the last call to
 * g_application_release() before the application stops running.
 *
 * This call has no side effects of its own.  The value set here is only
 * used for next time g_application_release() drops the use count to
 * zero.  Any timeouts currently in progress are not impacted.
 *
 * Returns: the timeout, in milliseconds
 *
 * Since: 2.28
 **/
void
g_application_set_inactivity_timeout (GApplication *application,
                                      guint         inactivity_timeout)
{
  g_return_if_fail (G_IS_APPLICATION (application));

  if (application->priv->inactivity_timeout != inactivity_timeout)
    {
      application->priv->inactivity_timeout = inactivity_timeout;

      g_object_notify (G_OBJECT (application), "inactivity-timeout");
    }
}
/* Read-only property getters (is registered, is remote) {{{1 */
/**
 * g_application_get_is_registered:
 * @application: a #GApplication
 * @returns: %TRUE if @application is registered
 *
 * Checks if @application is registered.
 *
 * An application is registered if g_application_register() has been
 * successfully called.
 *
 * Since: 2.28
 **/
gboolean
g_application_get_is_registered (GApplication *application)
{
  g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);

  return application->priv->is_registered;
}

/**
 * g_application_get_is_remote:
 * @application: a #GApplication
 * @returns: %TRUE if @application is remote
 *
 * Checks if @application is remote.
 *
 * If @application is remote then it means that another instance of
 * application already exists (the 'primary' instance).  Calls to
 * perform actions on @application will result in the actions being
 * performed by the primary instance.
 *
 * The value of this property can not be accessed before
 * g_application_register() has been called.  See
 * g_application_get_is_registered().
 *
 * Since: 2.28
 **/
gboolean
g_application_get_is_remote (GApplication *application)
{
  g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
  g_return_val_if_fail (application->priv->is_registered, FALSE);

  return application->priv->is_remote;
}

/* Register {{{1 */
/**
 * g_application_register:
 * @application: a #GApplication
 * @cancellable: a #GCancellable, or %NULL
 * @error: a pointer to a NULL #GError, or %NULL
 * @returns: %TRUE if registration succeeded
 *
 * Attempts registration of the application.
 *
 * This is the point at which the application discovers if it is the
 * primary instance or merely acting as a remote for an already-existing
 * primary instance.
 *
 * If the application has already been registered then %TRUE is
 * returned with no work performed.
 *
 * The startup() virtual function is invoked if registration succeeds
 * and @application is the primary instance.
 *
 * In the event of an error (such as @cancellable being cancelled, or a
 * failure to connect to the session bus), %FALSE is returned and @error
 * is set appropriately.
 *
 * Note: the return value of this function is not an indicator that this
 * instance is or is not the primary instance of the application.  See
 * g_application_get_is_remote() for that.
 *
 * Since: 2.28
 **/
gboolean
g_application_register (GApplication  *application,
                        GCancellable  *cancellable,
                        GError       **error)
{
  g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);

  if (!application->priv->is_registered)
    {
      gboolean is_remote;
      gboolean try;

      /* don't try to be the primary instance if
       * G_APPLICATION_IS_LAUNCHER was specified.
       */
      try = !(application->priv->flags & G_APPLICATION_IS_LAUNCHER);

      application->priv->impl =
        g_application_impl_register (application, application->priv->id,
                                     application->priv->flags,
                                     &is_remote, cancellable, error);

      if (application->priv->impl == NULL)
        return FALSE;

      application->priv->is_remote = is_remote;
      application->priv->is_registered = TRUE;

      g_object_notify (G_OBJECT (application), "is-registered");

      if (!is_remote)
        g_signal_emit (application, g_application_signals[SIGNAL_STARTUP], 0);
    }

  return TRUE;
}

/* Hold/release {{{1 */
/**
 * g_application_hold:
 * @application: a #GApplication
 *
 * Increases the use count of @application.
 *
 * Use this function to indicate that the application has a reason to
 * continue to run.  For example, g_application_hold() is called by Gtk
 * when a toplevel window is on the screen.
 *
 * To cancel the hold, call g_application_release().
 **/
void
g_application_hold (GApplication *application)
{
  if (application->priv->inactivity_timeout_id)
    {
      g_source_remove (application->priv->inactivity_timeout_id);
      application->priv->inactivity_timeout_id = 0;
    }

  application->priv->use_count++;
}

static gboolean
inactivity_timeout_expired (gpointer data)
{
  GApplication *application = G_APPLICATION (data);

  G_APPLICATION_GET_CLASS (application)
    ->quit_mainloop (application);

  return FALSE;
}


/**
 * g_application_release:
 * @application: a #GApplication
 *
 * Decrease the use count of @application.
 *
 * When the use count reaches zero, the application will stop running.
 *
 * Never call this function except to cancel the effect of a previous
 * call to g_application_hold().
 **/
void
g_application_release (GApplication *application)
{
  application->priv->use_count--;

  if (application->priv->use_count == 0)
    {
      if (application->priv->inactivity_timeout)
        application->priv->inactivity_timeout_id =
          g_timeout_add (application->priv->inactivity_timeout,
                         inactivity_timeout_expired, application);

      else
        G_APPLICATION_GET_CLASS (application)
          ->quit_mainloop (application);
    }
}

/* Activate, Open {{{1 */
/**
 * g_application_activate:
 * @application: a #GApplication
 *
 * Activates the application.
 *
 * In essence, this results in the activate() virtual function being
 * invoked in the primary instance.
 *
 * The application must be registered before calling this function.
 *
 * Since: 2.28
 **/
void
g_application_activate (GApplication *application)
{
  g_return_if_fail (G_IS_APPLICATION (application));
  g_return_if_fail (application->priv->is_registered);

  if (application->priv->is_remote)
    g_application_impl_activate (application->priv->impl,
                                 get_platform_data (application));

  else
    g_signal_emit (application, g_application_signals[SIGNAL_ACTIVATE], 0);
}

/**
 * g_application_open:
 * @application: a #GApplication
 * @files: an array of #GFile<!-- -->s to open
 * @n_files: the length of the @files array
 * @hint: a hint (or ""), but never %NULL
 *
 * Opens the given files.
 *
 * In essence, this results in the open() virtual function being invoked
 * in the primary instance.
 *
 * @n_files must be greater than zero.
 *
 * @hint is simply passed through to the open() virtual function.  It is
 * intended to be used by applications that have multiple modes for
 * opening files (eg: "view" vs "edit", etc).  Unless you have a need
 * for this functionality, you should use "".
 *
 * The application must be registered before calling this function and
 * it must have the %G_APPLICATION_CAN_OPEN flag set.  The open()
 * virtual function should also be implemented in order for anything
 * meaningful to happen.
 *
 * Since: 2.28
 **/
void
g_application_open (GApplication  *application,
                    GFile        **files,
                    gint           n_files,
                    const gchar   *hint)
{
  g_return_if_fail (G_IS_APPLICATION (application));
  g_return_if_fail (application->priv->flags &
                    G_APPLICATION_HANDLES_OPEN);
  g_return_if_fail (application->priv->is_registered);

  if (application->priv->is_remote)
    g_application_impl_open (application->priv->impl,
                             files, n_files, hint,
                             get_platform_data (application));

  else
    g_signal_emit (application, g_application_signals[SIGNAL_OPEN],
                   0, files, n_files, hint);
}

/* Run {{{1 */
/**
 * g_application_run:
 * @application: a #GApplication
 * @argc: the argc from main()
 * @argv: the argv from main()
 * @returns: the exit status
 *
 * Runs the application.
 *
 * This function is intended to be run from main() and its return value
 * is intended to be returned by main().
 *
 * First, the handle_command_line() virtual function is invoked.  This
 * function always runs on the local instance.  If that function returns
 * %FALSE then the application is registered and the command_line()
 * virtual function is invoked in the primary instance (which may or may
 * not be this instance).
 *
 * If the application has the %G_APPLICATION_REMOTE_COMMAND_LINE
 * flag set then the default implementation of handle_command_line()
 * always returns %FALSE immediately, resulting in the commandline
 * always being handled in the primary instance.
 *
 * Otherwise, the default implementation of handle_command_line() tries
 * to do a couple of things that are probably reasoanble for most
 * applications.  First, g_application_register() is called to attempt
 * to register the application.  If that works, then the command line
 * arguments are inspected.  If no commandline arguments are given, then
 * g_application_activate() is called.  If commandline arguments are
 * given and the %G_APPLICATION_CAN_OPEN flags is set then they
 * are assumed to be filenames and g_application_open() is called.
 *
 * If you are interested in doing more complicated local handling of the
 * commandline then you should override handle_command_line().
 *
 * If, after the above is done, the use count of the application is zero
 * then the exit status is returned immediately.  If the use count is
 * non-zero then the mainloop is run until the use count falls to zero,
 * at which point 0 is returned.
 *
 * Since: 2.28
 **/
int
g_application_run (GApplication  *application,
                   int            argc,
                   char         **argv)
{
  g_return_val_if_fail (G_IS_APPLICATION (application), 1);
  g_return_val_if_fail (argc == 0 || argv != NULL, 1);

  return g_application_run_with_arguments (application,
    g_variant_new_bytestring_array ((const gchar **) argv, argc));
}

/**
 * g_application_run_with_arguments:
 * @application: a #GApplication
 * @arguments: a bytestring array #GVariant
 * @returns: the exit status
 *
 * This is a bindings-friendly version of g_application_run().
 *
 * This function will consume @arguments if it is floating.
 **/
int
g_application_run_with_arguments (GApplication *application,
                                  GVariant     *arguments)
{
  int status;

  g_return_val_if_fail (G_IS_APPLICATION (application), 1);
  g_return_val_if_fail (G_IS_APPLICATION (application), 1);

  g_variant_ref_sink (arguments);

  if (g_get_prgname () == NULL && g_variant_n_children (arguments))
    {
      const gchar *argv0;
      gchar *prgname;

      g_variant_get_child (arguments, 0, "^&ay", &argv0);
      prgname = g_path_get_basename (argv0);
      g_set_prgname (prgname);
      g_free (prgname);
    }

  if (!G_APPLICATION_GET_CLASS (application)
        ->local_command_line (application, &arguments, &status))
    {
      GError *error = NULL;

      if (!g_application_register (application, NULL, &error))
        {
          g_printerr ("%s", error->message);
          g_error_free (error);
          return 1;
        }

      if (application->priv->is_remote)
        {
          GVariant *platform_data;

          platform_data = get_platform_data (application);
          status = g_application_impl_command_line (application->priv->impl,
                                                    arguments, platform_data);
        }
      else
        {
          GApplicationCommandLine *cmdline;

          cmdline = g_object_new (G_TYPE_APPLICATION_COMMAND_LINE,
                                  "arguments", arguments, NULL);
          g_signal_emit (application,
                         g_application_signals[SIGNAL_COMMAND_LINE],
                         0, cmdline, &status);
          g_object_unref (cmdline);
        }
    }

  g_variant_unref (arguments);

  if (application->priv->flags & G_APPLICATION_IS_SERVICE &&
      !application->priv->use_count &&
      !application->priv->inactivity_timeout_id)
    {
      application->priv->inactivity_timeout_id =
        g_timeout_add (10000, inactivity_timeout_expired, application);
    }

  if (application->priv->use_count ||
      application->priv->inactivity_timeout_id)
    {
      G_APPLICATION_GET_CLASS (application)
        ->run_mainloop (application);
      status = 0;
    }

  if (application->priv->impl)
    g_application_impl_flush (application->priv->impl);

  return status;
}

/* Epilogue {{{1 */
/* vim:set foldmethod=marker: */