gio/gapplication.c

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License as published
   6  * by the Free Software Foundation; either version 2 of the licence or (at
   7  * your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General
  15  * Public License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  *
  19  * Authors: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 /* Prologue {{{1 */
  23 #include "config.h"
  24
  25 #include "gapplication.h"
  26
  27 #include "gapplicationcommandline.h"
  28 #include "gsimpleactiongroup.h"
  29 #include "gremoteactiongroup.h"
  30 #include "gapplicationimpl.h"
  31 #include "gactiongroup.h"
  32 #include "gactionmap.h"
  33 #include "gmenumodel.h"
  34 #include "gsettings.h"
  35
  36 #include "gioenumtypes.h"
  37 #include "gioenums.h"
  38 #include "gfile.h"
  39
  40 #include "glibintl.h"
  41
  42 #include <string.h>
  43
  44 /**
  45  * SECTION:gapplication
  46  * @title: GApplication
  47  * @short_description: Core application class
  48  *
  49  * A #GApplication is the foundation of an application.  It wraps some
  50  * low-level platform-specific services and is intended to act as the
  51  * foundation for higher-level application classes such as
  52  * #GtkApplication or #MxApplication.  In general, you should not use
  53  * this class outside of a higher level framework.
  54  *
  55  * GApplication provides convenient life cycle management by maintaining
  56  * a <firstterm>use count</firstterm> for the primary application instance.
  57  * The use count can be changed using g_application_hold() and
  58  * g_application_release(). If it drops to zero, the application exits.
  59  * Higher-level classes such as #GtkApplication employ the use count to
  60  * ensure that the application stays alive as long as it has any opened
  61  * windows.
  62  *
  63  * Another feature that GApplication (optionally) provides is process
  64  * uniqueness.  Applications can make use of this functionality by
  65  * providing a unique application ID.  If given, only one application
  66  * with this ID can be running at a time per session.  The session
  67  * concept is platform-dependent, but corresponds roughly to a graphical
  68  * desktop login.  When your application is launched again, its
  69  * arguments are passed through platform communication to the already
  70  * running program.  The already running instance of the program is
  71  * called the <firstterm>primary instance</firstterm>. On Linux, the
  72  * D-Bus session bus is used for communication.
  73  *
  74  * If used, the expected form of an application identifier is very close
  75  * to that of of a
  76  * <ulink url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-interface">DBus bus name</ulink>.
  77  * Examples include: "com.example.MyApp", "org.example.internal-apps.Calculator".
  78  * For details on valid application identifiers, see g_application_id_is_valid().
  79  *
  80  * On Linux, the application identifier is claimed as a well-known bus name
  81  * on the user's session bus.  This means that the uniqueness of your
  82  * application is scoped to the current session.  It also means that your
  83  * application may provide additional services (through registration of other
  84  * object paths) at that bus name.  The registration of these object paths
  85  * should be done with the shared GDBus session bus.  Note that due to the
  86  * internal architecture of GDBus, method calls can be dispatched at any time
  87  * (even if a main loop is not running).  For this reason, you must ensure that
  88  * any object paths that you wish to register are registered before #GApplication
  89  * attempts to acquire the bus name of your application (which happens in
  90  * g_application_register()).  Unfortunately, this means that you cannot use
  91  * g_application_get_is_remote() to decide if you want to register object paths.
  92  *
  93  * GApplication also implements the #GActionGroup and #GActionMap
  94  * interfaces and lets you easily export actions by adding them with
  95  * g_action_map_add_action(). When invoking an action by calling
  96  * g_action_group_activate_action() on the application, it is always
  97  * invoked in the primary instance. The actions are also exported on
  98  * the session bus, and GIO provides the #GDBusActionGroup wrapper to
  99  * conveniently access them remotely. GIO provides a #GDBusMenuModel wrapper
 100  * for remote access to exported #GMenuModels.
 101  *
 102  * There is a number of different entry points into a GApplication:
 103  * <itemizedlist>
 104  * <listitem>via 'Activate' (i.e. just starting the application)</listitem>
 105  * <listitem>via 'Open' (i.e. opening some files)</listitem>
 106  * <listitem>by handling a command-line</listitem>
 107  * <listitem>via activating an action</listitem>
 108  * </itemizedlist>
 109  * The #GApplication::startup signal lets you handle the application
 110  * initialization for all of these in a single place.
 111  *
 112  * Regardless of which of these entry points is used to start the application,
 113  * GApplication passes some <firstterm id="platform-data">platform
 114  * data</firstterm> from the launching instance to the primary instance,
 115  * in the form of a #GVariant dictionary mapping strings to variants.
 116  * To use platform data, override the @before_emit or @after_emit virtual
 117  * functions in your #GApplication subclass. When dealing with
 118  * #GApplicationCommandLine objects, the platform data is directly
 119  * available via g_application_command_line_get_cwd(),
 120  * g_application_command_line_get_environ() and
 121  * g_application_command_line_get_platform_data().
 122  *
 123  * As the name indicates, the platform data may vary depending on the
 124  * operating system, but it always includes the current directory (key
 125  * "cwd"), and optionally the environment (ie the set of environment
 126  * variables and their values) of the calling process (key "environ").
 127  * The environment is only added to the platform data if the
 128  * %G_APPLICATION_SEND_ENVIRONMENT flag is set. #GApplication subclasses
 129  * can add their own platform data by overriding the @add_platform_data
 130  * virtual function. For instance, #GtkApplication adds startup notification
 131  * data in this way.
 132  *
 133  * To parse commandline arguments you may handle the
 134  * #GApplication::command-line signal or override the local_command_line()
 135  * vfunc, to parse them in either the primary instance or the local instance,
 136  * respectively.
 137  *
 138  * <example id="gapplication-example-open"><title>Opening files with a GApplication</title>
 139  * <programlisting>
 140  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-open.c">
 141  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 142  * </xi:include>
 143  * </programlisting>
 144  * </example>
 145  *
 146  * <example id="gapplication-example-actions"><title>A GApplication with actions</title>
 147  * <programlisting>
 148  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-actions.c">
 149  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 150  * </xi:include>
 151  * </programlisting>
 152  * </example>
 153  *
 154  * <example id="gapplication-example-menu"><title>A GApplication with menus</title>
 155  * <programlisting>
 156  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-menu.c">
 157  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 158  * </xi:include>
 159  * </programlisting>
 160  * </example>
 161  */
 162
 163 /**
 164  * GApplicationClass:
 165  * @startup: invoked on the primary instance immediately after registration
 166  * @shutdown: invoked only on the registered primary instance immediately
 167  *      after the main loop terminates
 168  * @activate: invoked on the primary instance when an activation occurs
 169  * @open: invoked on the primary instance when there are files to open
 170  * @command_line: invoked on the primary instance when a command-line is
 171  *   not handled locally
 172  * @local_command_line: invoked (locally) when the process has been invoked
 173  *     via commandline execution (as opposed to, say, D-Bus activation - which
 174  *     is not currently supported by GApplication). The virtual function has
 175  *     the chance to inspect (and possibly replace) the list of command line
 176  *     arguments. See g_application_run() for more information.
 177  * @before_emit: invoked on the primary instance before 'activate', 'open',
 178  *     'command-line' or any action invocation, gets the 'platform data' from
 179  *     the calling instance
 180  * @after_emit: invoked on the primary instance after 'activate', 'open',
 181  *     'command-line' or any action invocation, gets the 'platform data' from
 182  *     the calling instance
 183  * @add_platform_data: invoked (locally) to add 'platform data' to be sent to
 184  *     the primary instance when activating, opening or invoking actions
 185  * @quit_mainloop: Used to be invoked on the primary instance when the use
 186  *     count of the application drops to zero (and after any inactivity
 187  *     timeout, if requested). Not used anymore since 2.32
 188  * @run_mainloop: Used to be invoked on the primary instance from
 189  *     g_application_run() if the use-count is non-zero. Since 2.32,
 190  *     GApplication is iterating the main context directly and is not
 191  *     using @run_mainloop anymore
 192  *
 193  * Virtual function table for #GApplication.
 194  *
 195  * Since: 2.28
 196  */
 197
 198 struct _GApplicationPrivate
 199 {
 200   GApplicationFlags  flags;
 201   gchar             *id;
 202
 203   GActionGroup      *actions;
 204   GMenuModel        *app_menu;
 205   GMenuModel        *menubar;
 206
 207   guint              inactivity_timeout_id;
 208   guint              inactivity_timeout;
 209   guint              use_count;
 210
 211   guint              is_registered : 1;
 212   guint              is_remote : 1;
 213   guint              did_startup : 1;
 214   guint              did_shutdown : 1;
 215   guint              must_quit_now : 1;
 216
 217   GRemoteActionGroup *remote_actions;
 218   GApplicationImpl   *impl;
 219 };
 220
 221 enum
 222 {
 223   PROP_NONE,
 224   PROP_APPLICATION_ID,
 225   PROP_FLAGS,
 226   PROP_IS_REGISTERED,
 227   PROP_IS_REMOTE,
 228   PROP_INACTIVITY_TIMEOUT,
 229   PROP_ACTION_GROUP
 230 };
 231
 232 enum
 233 {
 234   SIGNAL_STARTUP,
 235   SIGNAL_SHUTDOWN,
 236   SIGNAL_ACTIVATE,
 237   SIGNAL_OPEN,
 238   SIGNAL_ACTION,
 239   SIGNAL_COMMAND_LINE,
 240   NR_SIGNALS
 241 };
 242
 243 static guint g_application_signals[NR_SIGNALS];
 244
 245 static void g_application_action_group_iface_init (GActionGroupInterface *);
 246 static void g_application_action_map_iface_init (GActionMapInterface *);
 247 G_DEFINE_TYPE_WITH_CODE (GApplication, g_application, G_TYPE_OBJECT,
 248  G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP, g_application_action_group_iface_init)
 249  G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_MAP, g_application_action_map_iface_init))
 250
 251 /* GApplicationExportedActions {{{1 */
 252
 253 /* We create a subclass of GSimpleActionGroup that implements
 254  * GRemoteActionGroup and deals with the platform data using
 255  * GApplication's before/after_emit vfuncs.  This is the action group we
 256  * will be exporting.
 257  *
 258  * We could implement GRemoteActionGroup on GApplication directly, but
 259  * this would be potentially extremely confusing to have exposed as part
 260  * of the public API of GApplication.  We certainly don't want anyone in
 261  * the same process to be calling these APIs...
 262  */
 263 typedef GSimpleActionGroupClass GApplicationExportedActionsClass;
 264 typedef struct
 265 {
 266   GSimpleActionGroup parent_instance;
 267   GApplication *application;
 268 } GApplicationExportedActions;
 269
 270 static GType g_application_exported_actions_get_type   (void);
 271 static void  g_application_exported_actions_iface_init (GRemoteActionGroupInterface *iface);
 272 G_DEFINE_TYPE_WITH_CODE (GApplicationExportedActions, g_application_exported_actions, G_TYPE_SIMPLE_ACTION_GROUP,
 273                          G_IMPLEMENT_INTERFACE (G_TYPE_REMOTE_ACTION_GROUP, g_application_exported_actions_iface_init))
 274
 275 static void
 276 g_application_exported_actions_activate_action_full (GRemoteActionGroup *remote,
 277                                                      const gchar        *action_name,
 278                                                      GVariant           *parameter,
 279                                                      GVariant           *platform_data)
 280 {
 281   GApplicationExportedActions *exported = (GApplicationExportedActions *) remote;
 282
 283   G_APPLICATION_GET_CLASS (exported->application)
 284     ->before_emit (exported->application, platform_data);
 285
 286   g_action_group_activate_action (G_ACTION_GROUP (exported), action_name, parameter);
 287
 288   G_APPLICATION_GET_CLASS (exported->application)
 289     ->after_emit (exported->application, platform_data);
 290 }
 291
 292 static void
 293 g_application_exported_actions_change_action_state_full (GRemoteActionGroup *remote,
 294                                                          const gchar        *action_name,
 295                                                          GVariant           *value,
 296                                                          GVariant           *platform_data)
 297 {
 298   GApplicationExportedActions *exported = (GApplicationExportedActions *) remote;
 299
 300   G_APPLICATION_GET_CLASS (exported->application)
 301     ->before_emit (exported->application, platform_data);
 302
 303   g_action_group_change_action_state (G_ACTION_GROUP (exported), action_name, value);
 304
 305   G_APPLICATION_GET_CLASS (exported->application)
 306     ->after_emit (exported->application, platform_data);
 307 }
 308
 309 static void
 310 g_application_exported_actions_init (GApplicationExportedActions *actions)
 311 {
 312 }
 313
 314 static void
 315 g_application_exported_actions_iface_init (GRemoteActionGroupInterface *iface)
 316 {
 317   iface->activate_action_full = g_application_exported_actions_activate_action_full;
 318   iface->change_action_state_full = g_application_exported_actions_change_action_state_full;
 319 }
 320
 321 static void
 322 g_application_exported_actions_class_init (GApplicationExportedActionsClass *class)
 323 {
 324 }
 325
 326 static GActionGroup *
 327 g_application_exported_actions_new (GApplication *application)
 328 {
 329   GApplicationExportedActions *actions;
 330
 331   actions = g_object_new (g_application_exported_actions_get_type (), NULL);
 332   actions->application = application;
 333
 334   return G_ACTION_GROUP (actions);
 335 }
 336
 337 /* vfunc defaults {{{1 */
 338 static void
 339 g_application_real_before_emit (GApplication *application,
 340                                 GVariant     *platform_data)
 341 {
 342 }
 343
 344 static void
 345 g_application_real_after_emit (GApplication *application,
 346                                GVariant     *platform_data)
 347 {
 348 }
 349
 350 static void
 351 g_application_real_startup (GApplication *application)
 352 {
 353   application->priv->did_startup = TRUE;
 354 }
 355
 356 static void
 357 g_application_real_shutdown (GApplication *application)
 358 {
 359   application->priv->did_shutdown = TRUE;
 360 }
 361
 362 static void
 363 g_application_real_activate (GApplication *application)
 364 {
 365   if (!g_signal_has_handler_pending (application,
 366                                      g_application_signals[SIGNAL_ACTIVATE],
 367                                      0, TRUE) &&
 368       G_APPLICATION_GET_CLASS (application)->activate == g_application_real_activate)
 369     {
 370       static gboolean warned;
 371
 372       if (warned)
 373         return;
 374
 375       g_warning ("Your application does not implement "
 376                  "g_application_activate() and has no handlers connected "
 377                  "to the 'activate' signal.  It should do one of these.");
 378       warned = TRUE;
 379     }
 380 }
 381
 382 static void
 383 g_application_real_open (GApplication  *application,
 384                          GFile        **files,
 385                          gint           n_files,
 386                          const gchar   *hint)
 387 {
 388   if (!g_signal_has_handler_pending (application,
 389                                      g_application_signals[SIGNAL_OPEN],
 390                                      0, TRUE) &&
 391       G_APPLICATION_GET_CLASS (application)->open == g_application_real_open)
 392     {
 393       static gboolean warned;
 394
 395       if (warned)
 396         return;
 397
 398       g_warning ("Your application claims to support opening files "
 399                  "but does not implement g_application_open() and has no "
 400                  "handlers connected to the 'open' signal.");
 401       warned = TRUE;
 402     }
 403 }
 404
 405 static int
 406 g_application_real_command_line (GApplication            *application,
 407                                  GApplicationCommandLine *cmdline)
 408 {
 409   if (!g_signal_has_handler_pending (application,
 410                                      g_application_signals[SIGNAL_COMMAND_LINE],
 411                                      0, TRUE) &&
 412       G_APPLICATION_GET_CLASS (application)->command_line == g_application_real_command_line)
 413     {
 414       static gboolean warned;
 415
 416       if (warned)
 417         return 1;
 418
 419       g_warning ("Your application claims to support custom command line "
 420                  "handling but does not implement g_application_command_line() "
 421                  "and has no handlers connected to the 'command-line' signal.");
 422
 423       warned = TRUE;
 424     }
 425
 426     return 1;
 427 }
 428
 429 static gboolean
 430 g_application_real_local_command_line (GApplication   *application,
 431                                        gchar        ***arguments,
 432                                        int            *exit_status)
 433 {
 434   if (application->priv->flags & G_APPLICATION_HANDLES_COMMAND_LINE)
 435     return FALSE;
 436
 437   else
 438     {
 439       GError *error = NULL;
 440       gint n_args;
 441
 442       if (!g_application_register (application, NULL, &error))
 443         {
 444           g_critical ("%s", error->message);
 445           g_error_free (error);
 446           *exit_status = 1;
 447           return TRUE;
 448         }
 449
 450       n_args = g_strv_length (*arguments);
 451
 452       if (application->priv->flags & G_APPLICATION_IS_SERVICE)
 453         {
 454           if ((*exit_status = n_args > 1))
 455             {
 456               g_printerr ("GApplication service mode takes no arguments.\n");
 457               application->priv->flags &= ~G_APPLICATION_IS_SERVICE;
 458             }
 459
 460           return TRUE;
 461         }
 462
 463       if (n_args <= 1)
 464         {
 465           g_application_activate (application);
 466           *exit_status = 0;
 467         }
 468
 469       else
 470         {
 471           if (~application->priv->flags & G_APPLICATION_HANDLES_OPEN)
 472             {
 473               g_critical ("This application can not open files.");
 474               *exit_status = 1;
 475             }
 476           else
 477             {
 478               GFile **files;
 479               gint n_files;
 480               gint i;
 481
 482               n_files = n_args - 1;
 483               files = g_new (GFile *, n_files);
 484
 485               for (i = 0; i < n_files; i++)
 486                 files[i] = g_file_new_for_commandline_arg ((*arguments)[i + 1]);
 487
 488               g_application_open (application, files, n_files, "");
 489
 490               for (i = 0; i < n_files; i++)
 491                 g_object_unref (files[i]);
 492               g_free (files);
 493
 494               *exit_status = 0;
 495             }
 496         }
 497
 498       return TRUE;
 499     }
 500 }
 501
 502 static void
 503 g_application_real_add_platform_data (GApplication    *application,
 504                                       GVariantBuilder *builder)
 505 {
 506 }
 507
 508 /* GObject implementation stuff {{{1 */
 509 static void
 510 g_application_set_property (GObject      *object,
 511                             guint         prop_id,
 512                             const GValue *value,
 513                             GParamSpec   *pspec)
 514 {
 515   GApplication *application = G_APPLICATION (object);
 516
 517   switch (prop_id)
 518     {
 519     case PROP_APPLICATION_ID:
 520       g_application_set_application_id (application,
 521                                         g_value_get_string (value));
 522       break;
 523
 524     case PROP_FLAGS:
 525       g_application_set_flags (application, g_value_get_flags (value));
 526       break;
 527
 528     case PROP_INACTIVITY_TIMEOUT:
 529       g_application_set_inactivity_timeout (application,
 530                                             g_value_get_uint (value));
 531       break;
 532
 533     case PROP_ACTION_GROUP:
 534       g_clear_object (&application->priv->actions);
 535       application->priv->actions = g_value_dup_object (value);
 536       break;
 537
 538     default:
 539       g_assert_not_reached ();
 540     }
 541 }
 542
 543 /**
 544  * g_application_set_action_group:
 545  * @application: a #GApplication
 546  * @action_group: (allow-none): a #GActionGroup, or %NULL
 547  *
 548  * This used to be how actions were associated with a #GApplication.
 549  * Now there is #GActionMap for that.
 550  *
 551  * Since: 2.28
 552  *
 553  * Deprecated:2.32:Use the #GActionMap interface instead.  Never ever
 554  * mix use of this API with use of #GActionMap on the same @application
 555  * or things will go very badly wrong.  This function is known to
 556  * introduce buggy behaviour (ie: signals not emitted on changes to the
 557  * action group), so you should really use #GActionMap instead.
 558  **/
 559 void
 560 g_application_set_action_group (GApplication *application,
 561                                 GActionGroup *action_group)
 562 {
 563   g_return_if_fail (G_IS_APPLICATION (application));
 564   g_return_if_fail (!application->priv->is_registered);
 565
 566   if (application->priv->actions != NULL)
 567     g_object_unref (application->priv->actions);
 568
 569   application->priv->actions = action_group;
 570
 571   if (application->priv->actions != NULL)
 572     g_object_ref (application->priv->actions);
 573 }
 574
 575 static void
 576 g_application_get_property (GObject    *object,
 577                             guint       prop_id,
 578                             GValue     *value,
 579                             GParamSpec *pspec)
 580 {
 581   GApplication *application = G_APPLICATION (object);
 582
 583   switch (prop_id)
 584     {
 585     case PROP_APPLICATION_ID:
 586       g_value_set_string (value,
 587                           g_application_get_application_id (application));
 588       break;
 589
 590     case PROP_FLAGS:
 591       g_value_set_flags (value,
 592                          g_application_get_flags (application));
 593       break;
 594
 595     case PROP_IS_REGISTERED:
 596       g_value_set_boolean (value,
 597                            g_application_get_is_registered (application));
 598       break;
 599
 600     case PROP_IS_REMOTE:
 601       g_value_set_boolean (value,
 602                            g_application_get_is_remote (application));
 603       break;
 604
 605     case PROP_INACTIVITY_TIMEOUT:
 606       g_value_set_uint (value,
 607                         g_application_get_inactivity_timeout (application));
 608       break;
 609
 610     default:
 611       g_assert_not_reached ();
 612     }
 613 }
 614
 615 static void
 616 g_application_constructed (GObject *object)
 617 {
 618   GApplication *application = G_APPLICATION (object);
 619
 620   if (g_application_get_default () == NULL)
 621     g_application_set_default (application);
 622 }
 623
 624 static void
 625 g_application_finalize (GObject *object)
 626 {
 627   GApplication *application = G_APPLICATION (object);
 628
 629   if (application->priv->impl)
 630     g_application_impl_destroy (application->priv->impl);
 631   g_free (application->priv->id);
 632
 633   if (g_application_get_default () == application)
 634     g_application_set_default (NULL);
 635
 636   if (application->priv->actions)
 637     g_object_unref (application->priv->actions);
 638
 639   G_OBJECT_CLASS (g_application_parent_class)
 640     ->finalize (object);
 641 }
 642
 643 static void
 644 g_application_init (GApplication *application)
 645 {
 646   application->priv = G_TYPE_INSTANCE_GET_PRIVATE (application,
 647                                                    G_TYPE_APPLICATION,
 648                                                    GApplicationPrivate);
 649
 650   application->priv->actions = g_application_exported_actions_new (application);
 651
 652   /* application->priv->actions is the one and only ref on the group, so when
 653    * we dispose, the action group will die, disconnecting all signals.
 654    */
 655   g_signal_connect_swapped (application->priv->actions, "action-added",
 656                             G_CALLBACK (g_action_group_action_added), application);
 657   g_signal_connect_swapped (application->priv->actions, "action-enabled-changed",
 658                             G_CALLBACK (g_action_group_action_enabled_changed), application);
 659   g_signal_connect_swapped (application->priv->actions, "action-state-changed",
 660                             G_CALLBACK (g_action_group_action_state_changed), application);
 661   g_signal_connect_swapped (application->priv->actions, "action-removed",
 662                             G_CALLBACK (g_action_group_action_removed), application);
 663 }
 664
 665 static void
 666 g_application_class_init (GApplicationClass *class)
 667 {
 668   GObjectClass *object_class = G_OBJECT_CLASS (class);
 669
 670   object_class->constructed = g_application_constructed;
 671   object_class->finalize = g_application_finalize;
 672   object_class->get_property = g_application_get_property;
 673   object_class->set_property = g_application_set_property;
 674
 675   class->before_emit = g_application_real_before_emit;
 676   class->after_emit = g_application_real_after_emit;
 677   class->startup = g_application_real_startup;
 678   class->shutdown = g_application_real_shutdown;
 679   class->activate = g_application_real_activate;
 680   class->open = g_application_real_open;
 681   class->command_line = g_application_real_command_line;
 682   class->local_command_line = g_application_real_local_command_line;
 683   class->add_platform_data = g_application_real_add_platform_data;
 684
 685   g_object_class_install_property (object_class, PROP_APPLICATION_ID,
 686     g_param_spec_string ("application-id",
 687                          P_("Application identifier"),
 688                          P_("The unique identifier for the application"),
 689                          NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
 690                          G_PARAM_STATIC_STRINGS));
 691
 692   g_object_class_install_property (object_class, PROP_FLAGS,
 693     g_param_spec_flags ("flags",
 694                         P_("Application flags"),
 695                         P_("Flags specifying the behaviour of the application"),
 696                         G_TYPE_APPLICATION_FLAGS, G_APPLICATION_FLAGS_NONE,
 697                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 698
 699   g_object_class_install_property (object_class, PROP_IS_REGISTERED,
 700     g_param_spec_boolean ("is-registered",
 701                           P_("Is registered"),
 702                           P_("If g_application_register() has been called"),
 703                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 704
 705   g_object_class_install_property (object_class, PROP_IS_REMOTE,
 706     g_param_spec_boolean ("is-remote",
 707                           P_("Is remote"),
 708                           P_("If this application instance is remote"),
 709                           FALSE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 710
 711   g_object_class_install_property (object_class, PROP_INACTIVITY_TIMEOUT,
 712     g_param_spec_uint ("inactivity-timeout",
 713                        P_("Inactivity timeout"),
 714                        P_("Time (ms) to stay alive after becoming idle"),
 715                        0, G_MAXUINT, 0,
 716                        G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 717
 718   g_object_class_install_property (object_class, PROP_ACTION_GROUP,
 719     g_param_spec_object ("action-group",
 720                          P_("Action group"),
 721                          P_("The group of actions that the application exports"),
 722                          G_TYPE_ACTION_GROUP,
 723                          G_PARAM_DEPRECATED | G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS));
 724
 725   /**
 726    * GApplication::startup:
 727    * @application: the application
 728    *
 729    * The ::startup signal is emitted on the primary instance immediately
 730    * after registration. See g_application_register().
 731    */
 732   g_application_signals[SIGNAL_STARTUP] =
 733     g_signal_new ("startup", G_TYPE_APPLICATION, G_SIGNAL_RUN_FIRST,
 734                   G_STRUCT_OFFSET (GApplicationClass, startup),
 735                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 736
 737   /**
 738    * GApplication::shutdown:
 739    * @application: the application
 740    *
 741    * The ::shutdown signal is emitted only on the registered primary instance
 742    * immediately after the main loop terminates.
 743    */
 744   g_application_signals[SIGNAL_SHUTDOWN] =
 745     g_signal_new ("shutdown", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 746                   G_STRUCT_OFFSET (GApplicationClass, shutdown),
 747                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 748
 749   /**
 750    * GApplication::activate:
 751    * @application: the application
 752    *
 753    * The ::activate signal is emitted on the primary instance when an
 754    * activation occurs. See g_application_activate().
 755    */
 756   g_application_signals[SIGNAL_ACTIVATE] =
 757     g_signal_new ("activate", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 758                   G_STRUCT_OFFSET (GApplicationClass, activate),
 759                   NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
 760
 761
 762   /**
 763    * GApplication::open:
 764    * @application: the application
 765    * @files: (array length=n_files) (element-type GFile): an array of #GFiles
 766    * @n_files: the length of @files
 767    * @hint: a hint provided by the calling instance
 768    *
 769    * The ::open signal is emitted on the primary instance when there are
 770    * files to open. See g_application_open() for more information.
 771    */
 772   g_application_signals[SIGNAL_OPEN] =
 773     g_signal_new ("open", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 774                   G_STRUCT_OFFSET (GApplicationClass, open),
 775                   NULL, NULL, NULL,
 776                   G_TYPE_NONE, 3, G_TYPE_POINTER, G_TYPE_INT, G_TYPE_STRING);
 777
 778   /**
 779    * GApplication::command-line:
 780    * @application: the application
 781    * @command_line: a #GApplicationCommandLine representing the
 782    *     passed commandline
 783    *
 784    * The ::command-line signal is emitted on the primary instance when
 785    * a commandline is not handled locally. See g_application_run() and
 786    * the #GApplicationCommandLine documentation for more information.
 787    *
 788    * Returns: An integer that is set as the exit status for the calling
 789    *   process. See g_application_command_line_set_exit_status().
 790    */
 791   g_application_signals[SIGNAL_COMMAND_LINE] =
 792     g_signal_new ("command-line", G_TYPE_APPLICATION, G_SIGNAL_RUN_LAST,
 793                   G_STRUCT_OFFSET (GApplicationClass, command_line),
 794                   g_signal_accumulator_first_wins, NULL,
 795                   NULL,
 796                   G_TYPE_INT, 1, G_TYPE_APPLICATION_COMMAND_LINE);
 797
 798   g_type_class_add_private (class, sizeof (GApplicationPrivate));
 799 }
 800
 801 static GVariant *
 802 get_platform_data (GApplication *application)
 803 {
 804   GVariantBuilder *builder;
 805   GVariant *result;
 806
 807   builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));
 808
 809   {
 810     gchar *cwd = g_get_current_dir ();
 811     g_variant_builder_add (builder, "{sv}", "cwd",
 812                            g_variant_new_bytestring (cwd));
 813     g_free (cwd);
 814   }
 815
 816   if (application->priv->flags & G_APPLICATION_SEND_ENVIRONMENT)
 817     {
 818       GVariant *array;
 819       gchar **envp;
 820
 821       envp = g_get_environ ();
 822       array = g_variant_new_bytestring_array ((const gchar **) envp, -1);
 823       g_strfreev (envp);
 824
 825       g_variant_builder_add (builder, "{sv}", "environ", array);
 826     }
 827
 828   G_APPLICATION_GET_CLASS (application)->
 829     add_platform_data (application, builder);
 830
 831   result = g_variant_builder_end (builder);
 832   g_variant_builder_unref (builder);
 833
 834   return result;
 835 }
 836
 837 /* Application ID validity {{{1 */
 838
 839 /**
 840  * g_application_id_is_valid:
 841  * @application_id: a potential application identifier
 842  *
 843  * Checks if @application_id is a valid application identifier.
 844  *
 845  * A valid ID is required for calls to g_application_new() and
 846  * g_application_set_application_id().
 847  *
 848  * For convenience, the restrictions on application identifiers are
 849  * reproduced here:
 850  * <itemizedlist>
 851  *   <listitem>Application identifiers must contain only the ASCII characters "[A-Z][a-z][0-9]_-." and must not begin with a digit.</listitem>
 852  *   <listitem>Application identifiers must contain at least one '.' (period) character (and thus at least three elements).</listitem>
 853  *   <listitem>Application identifiers must not begin or end with a '.' (period) character.</listitem>
 854  *   <listitem>Application identifiers must not contain consecutive '.' (period) characters.</listitem>
 855  *   <listitem>Application identifiers must not exceed 255 characters.</listitem>
 856  * </itemizedlist>
 857  *
 858  * Returns: %TRUE if @application_id is valid
 859  **/
 860 gboolean
 861 g_application_id_is_valid (const gchar *application_id)
 862 {
 863   gsize len;
 864   gboolean allow_dot;
 865   gboolean has_dot;
 866
 867   len = strlen (application_id);
 868
 869   if (len > 255)
 870     return FALSE;
 871
 872   if (!g_ascii_isalpha (application_id[0]))
 873     return FALSE;
 874
 875   if (application_id[len-1] == '.')
 876     return FALSE;
 877
 878   application_id++;
 879   allow_dot = TRUE;
 880   has_dot = FALSE;
 881   for (; *application_id; application_id++)
 882     {
 883       if (g_ascii_isalnum (*application_id) ||
 884           (*application_id == '-') ||
 885           (*application_id == '_'))
 886         {
 887           allow_dot = TRUE;
 888         }
 889       else if (allow_dot && *application_id == '.')
 890         {
 891           has_dot = TRUE;
 892           allow_dot = FALSE;
 893         }
 894       else
 895         return FALSE;
 896     }
 897
 898   if (!has_dot)
 899     return FALSE;
 900
 901   return TRUE;
 902 }
 903
 904 /* Public Constructor {{{1 */
 905 /**
 906  * g_application_new:
 907  * @application_id: (allow-none): the application id
 908  * @flags: the application flags
 909  *
 910  * Creates a new #GApplication instance.
 911  *
 912  * This function calls g_type_init() for you.
 913  *
 914  * If non-%NULL, the application id must be valid.  See
 915  * g_application_id_is_valid().
 916  *
 917  * If no application ID is given then some features of #GApplication
 918  * (most notably application uniqueness) will be disabled.
 919  *
 920  * Returns: a new #GApplication instance
 921  **/
 922 GApplication *
 923 g_application_new (const gchar       *application_id,
 924                    GApplicationFlags  flags)
 925 {
 926   g_return_val_if_fail (application_id == NULL || g_application_id_is_valid (application_id), NULL);
 927
 928   g_type_init ();
 929
 930   return g_object_new (G_TYPE_APPLICATION,
 931                        "application-id", application_id,
 932                        "flags", flags,
 933                        NULL);
 934 }
 935
 936 /* Simple get/set: application id, flags, inactivity timeout {{{1 */
 937 /**
 938  * g_application_get_application_id:
 939  * @application: a #GApplication
 940  *
 941  * Gets the unique identifier for @application.
 942  *
 943  * Returns: the identifier for @application, owned by @application
 944  *
 945  * Since: 2.28
 946  **/
 947 const gchar *
 948 g_application_get_application_id (GApplication *application)
 949 {
 950   g_return_val_if_fail (G_IS_APPLICATION (application), NULL);
 951
 952   return application->priv->id;
 953 }
 954
 955 /**
 956  * g_application_set_application_id:
 957  * @application: a #GApplication
 958  * @application_id: (allow-none): the identifier for @application
 959  *
 960  * Sets the unique identifier for @application.
 961  *
 962  * The application id can only be modified if @application has not yet
 963  * been registered.
 964  *
 965  * If non-%NULL, the application id must be valid.  See
 966  * g_application_id_is_valid().
 967  *
 968  * Since: 2.28
 969  **/
 970 void
 971 g_application_set_application_id (GApplication *application,
 972                                   const gchar  *application_id)
 973 {
 974   g_return_if_fail (G_IS_APPLICATION (application));
 975
 976   if (g_strcmp0 (application->priv->id, application_id) != 0)
 977     {
 978       g_return_if_fail (application_id == NULL || g_application_id_is_valid (application_id));
 979       g_return_if_fail (!application->priv->is_registered);
 980
 981       g_free (application->priv->id);
 982       application->priv->id = g_strdup (application_id);
 983
 984       g_object_notify (G_OBJECT (application), "application-id");
 985     }
 986 }
 987
 988 /**
 989  * g_application_get_flags:
 990  * @application: a #GApplication
 991  *
 992  * Gets the flags for @application.
 993  *
 994  * See #GApplicationFlags.
 995  *
 996  * Returns: the flags for @application
 997  *
 998  * Since: 2.28
 999  **/
1000 GApplicationFlags
1001 g_application_get_flags (GApplication *application)
1002 {
1003   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
1004
1005   return application->priv->flags;
1006 }
1007
1008 /**
1009  * g_application_set_flags:
1010  * @application: a #GApplication
1011  * @flags: the flags for @application
1012  *
1013  * Sets the flags for @application.
1014  *
1015  * The flags can only be modified if @application has not yet been
1016  * registered.
1017  *
1018  * See #GApplicationFlags.
1019  *
1020  * Since: 2.28
1021  **/
1022 void
1023 g_application_set_flags (GApplication      *application,
1024                          GApplicationFlags  flags)
1025 {
1026   g_return_if_fail (G_IS_APPLICATION (application));
1027
1028   if (application->priv->flags != flags)
1029     {
1030       g_return_if_fail (!application->priv->is_registered);
1031
1032       application->priv->flags = flags;
1033
1034       g_object_notify (G_OBJECT (application), "flags");
1035     }
1036 }
1037
1038 /**
1039  * g_application_get_inactivity_timeout:
1040  * @application: a #GApplication
1041  *
1042  * Gets the current inactivity timeout for the application.
1043  *
1044  * This is the amount of time (in milliseconds) after the last call to
1045  * g_application_release() before the application stops running.
1046  *
1047  * Returns: the timeout, in milliseconds
1048  *
1049  * Since: 2.28
1050  **/
1051 guint
1052 g_application_get_inactivity_timeout (GApplication *application)
1053 {
1054   g_return_val_if_fail (G_IS_APPLICATION (application), 0);
1055
1056   return application->priv->inactivity_timeout;
1057 }
1058
1059 /**
1060  * g_application_set_inactivity_timeout:
1061  * @application: a #GApplication
1062  * @inactivity_timeout: the timeout, in milliseconds
1063  *
1064  * Sets the current inactivity timeout for the application.
1065  *
1066  * This is the amount of time (in milliseconds) after the last call to
1067  * g_application_release() before the application stops running.
1068  *
1069  * This call has no side effects of its own.  The value set here is only
1070  * used for next time g_application_release() drops the use count to
1071  * zero.  Any timeouts currently in progress are not impacted.
1072  *
1073  * Since: 2.28
1074  **/
1075 void
1076 g_application_set_inactivity_timeout (GApplication *application,
1077                                       guint         inactivity_timeout)
1078 {
1079   g_return_if_fail (G_IS_APPLICATION (application));
1080
1081   if (application->priv->inactivity_timeout != inactivity_timeout)
1082     {
1083       application->priv->inactivity_timeout = inactivity_timeout;
1084
1085       g_object_notify (G_OBJECT (application), "inactivity-timeout");
1086     }
1087 }
1088 /* Read-only property getters (is registered, is remote) {{{1 */
1089 /**
1090  * g_application_get_is_registered:
1091  * @application: a #GApplication
1092  *
1093  * Checks if @application is registered.
1094  *
1095  * An application is registered if g_application_register() has been
1096  * successfully called.
1097  *
1098  * Returns: %TRUE if @application is registered
1099  *
1100  * Since: 2.28
1101  **/
1102 gboolean
1103 g_application_get_is_registered (GApplication *application)
1104 {
1105   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
1106
1107   return application->priv->is_registered;
1108 }
1109
1110 /**
1111  * g_application_get_is_remote:
1112  * @application: a #GApplication
1113  *
1114  * Checks if @application is remote.
1115  *
1116  * If @application is remote then it means that another instance of
1117  * application already exists (the 'primary' instance).  Calls to
1118  * perform actions on @application will result in the actions being
1119  * performed by the primary instance.
1120  *
1121  * The value of this property cannot be accessed before
1122  * g_application_register() has been called.  See
1123  * g_application_get_is_registered().
1124  *
1125  * Returns: %TRUE if @application is remote
1126  *
1127  * Since: 2.28
1128  **/
1129 gboolean
1130 g_application_get_is_remote (GApplication *application)
1131 {
1132   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
1133   g_return_val_if_fail (application->priv->is_registered, FALSE);
1134
1135   return application->priv->is_remote;
1136 }
1137
1138 /* Register {{{1 */
1139 /**
1140  * g_application_register:
1141  * @application: a #GApplication
1142  * @cancellable: (allow-none): a #GCancellable, or %NULL
1143  * @error: a pointer to a NULL #GError, or %NULL
1144  *
1145  * Attempts registration of the application.
1146  *
1147  * This is the point at which the application discovers if it is the
1148  * primary instance or merely acting as a remote for an already-existing
1149  * primary instance.  This is implemented by attempting to acquire the
1150  * application identifier as a unique bus name on the session bus using
1151  * GDBus.
1152  *
1153  * If there is no application ID or if %G_APPLICATION_NON_UNIQUE was
1154  * given, then this process will always become the primary instance.
1155  *
1156  * Due to the internal architecture of GDBus, method calls can be
1157  * dispatched at any time (even if a main loop is not running).  For
1158  * this reason, you must ensure that any object paths that you wish to
1159  * register are registered before calling this function.
1160  *
1161  * If the application has already been registered then %TRUE is
1162  * returned with no work performed.
1163  *
1164  * The #GApplication::startup signal is emitted if registration succeeds
1165  * and @application is the primary instance (including the non-unique
1166  * case).
1167  *
1168  * In the event of an error (such as @cancellable being cancelled, or a
1169  * failure to connect to the session bus), %FALSE is returned and @error
1170  * is set appropriately.
1171  *
1172  * Note: the return value of this function is not an indicator that this
1173  * instance is or is not the primary instance of the application.  See
1174  * g_application_get_is_remote() for that.
1175  *
1176  * Returns: %TRUE if registration succeeded
1177  *
1178  * Since: 2.28
1179  **/
1180 gboolean
1181 g_application_register (GApplication  *application,
1182                         GCancellable  *cancellable,
1183                         GError       **error)
1184 {
1185   g_return_val_if_fail (G_IS_APPLICATION (application), FALSE);
1186
1187   if (!application->priv->is_registered)
1188     {
1189       if (application->priv->id == NULL)
1190         application->priv->flags |= G_APPLICATION_NON_UNIQUE;
1191
1192       application->priv->impl =
1193         g_application_impl_register (application, application->priv->id,
1194                                      application->priv->flags,
1195                                      application->priv->actions,
1196                                      &application->priv->remote_actions,
1197                                      cancellable, error);
1198
1199       if (application->priv->impl == NULL)
1200         return FALSE;
1201
1202       application->priv->is_remote = application->priv->remote_actions != NULL;
1203       application->priv->is_registered = TRUE;
1204
1205       g_object_notify (G_OBJECT (application), "is-registered");
1206
1207       if (!application->priv->is_remote)
1208         {
1209           g_signal_emit (application, g_application_signals[SIGNAL_STARTUP], 0);
1210
1211           if (!application->priv->did_startup)
1212             g_critical ("GApplication subclass '%s' failed to chain up on"
1213                         " ::startup (from start of override function)",
1214                         G_OBJECT_TYPE_NAME (application));
1215         }
1216     }
1217
1218   return TRUE;
1219 }
1220
1221 /* Hold/release {{{1 */
1222 /**
1223  * g_application_hold:
1224  * @application: a #GApplication
1225  *
1226  * Increases the use count of @application.
1227  *
1228  * Use this function to indicate that the application has a reason to
1229  * continue to run.  For example, g_application_hold() is called by GTK+
1230  * when a toplevel window is on the screen.
1231  *
1232  * To cancel the hold, call g_application_release().
1233  **/
1234 void
1235 g_application_hold (GApplication *application)
1236 {
1237   if (application->priv->inactivity_timeout_id)
1238     {
1239       g_source_remove (application->priv->inactivity_timeout_id);
1240       application->priv->inactivity_timeout_id = 0;
1241     }
1242
1243   application->priv->use_count++;
1244 }
1245
1246 static gboolean
1247 inactivity_timeout_expired (gpointer data)
1248 {
1249   GApplication *application = G_APPLICATION (data);
1250
1251   application->priv->inactivity_timeout_id = 0;
1252
1253   return G_SOURCE_REMOVE;
1254 }
1255
1256
1257 /**
1258  * g_application_release:
1259  * @application: a #GApplication
1260  *
1261  * Decrease the use count of @application.
1262  *
1263  * When the use count reaches zero, the application will stop running.
1264  *
1265  * Never call this function except to cancel the effect of a previous
1266  * call to g_application_hold().
1267  **/
1268 void
1269 g_application_release (GApplication *application)
1270 {
1271   application->priv->use_count--;
1272
1273   if (application->priv->use_count == 0 && application->priv->inactivity_timeout)
1274     application->priv->inactivity_timeout_id = g_timeout_add (application->priv->inactivity_timeout,
1275                                                               inactivity_timeout_expired, application);
1276 }
1277
1278 /* Activate, Open {{{1 */
1279 /**
1280  * g_application_activate:
1281  * @application: a #GApplication
1282  *
1283  * Activates the application.
1284  *
1285  * In essence, this results in the #GApplication::activate signal being
1286  * emitted in the primary instance.
1287  *
1288  * The application must be registered before calling this function.
1289  *
1290  * Since: 2.28
1291  **/
1292 void
1293 g_application_activate (GApplication *application)
1294 {
1295   g_return_if_fail (G_IS_APPLICATION (application));
1296   g_return_if_fail (application->priv->is_registered);
1297
1298   if (application->priv->is_remote)
1299     g_application_impl_activate (application->priv->impl,
1300                                  get_platform_data (application));
1301
1302   else
1303     g_signal_emit (application, g_application_signals[SIGNAL_ACTIVATE], 0);
1304 }
1305
1306 /**
1307  * g_application_open:
1308  * @application: a #GApplication
1309  * @files: (array length=n_files): an array of #GFiles to open
1310  * @n_files: the length of the @files array
1311  * @hint: a hint (or ""), but never %NULL
1312  *
1313  * Opens the given files.
1314  *
1315  * In essence, this results in the #GApplication::open signal being emitted
1316  * in the primary instance.
1317  *
1318  * @n_files must be greater than zero.
1319  *
1320  * @hint is simply passed through to the ::open signal.  It is
1321  * intended to be used by applications that have multiple modes for
1322  * opening files (eg: "view" vs "edit", etc).  Unless you have a need
1323  * for this functionality, you should use "".
1324  *
1325  * The application must be registered before calling this function
1326  * and it must have the %G_APPLICATION_HANDLES_OPEN flag set.
1327  *
1328  * Since: 2.28
1329  **/
1330 void
1331 g_application_open (GApplication  *application,
1332                     GFile        **files,
1333                     gint           n_files,
1334                     const gchar   *hint)
1335 {
1336   g_return_if_fail (G_IS_APPLICATION (application));
1337   g_return_if_fail (application->priv->flags &
1338                     G_APPLICATION_HANDLES_OPEN);
1339   g_return_if_fail (application->priv->is_registered);
1340
1341   if (application->priv->is_remote)
1342     g_application_impl_open (application->priv->impl,
1343                              files, n_files, hint,
1344                              get_platform_data (application));
1345
1346   else
1347     g_signal_emit (application, g_application_signals[SIGNAL_OPEN],
1348                    0, files, n_files, hint);
1349 }
1350
1351 /* Run {{{1 */
1352 /**
1353  * g_application_run:
1354  * @application: a #GApplication
1355  * @argc: the argc from main() (or 0 if @argv is %NULL)
1356  * @argv: (array length=argc) (allow-none): the argv from main(), or %NULL
1357  *
1358  * Runs the application.
1359  *
1360  * This function is intended to be run from main() and its return value
1361  * is intended to be returned by main(). Although you are expected to pass
1362  * the @argc, @argv parameters from main() to this function, it is possible
1363  * to pass %NULL if @argv is not available or commandline handling is not
1364  * required.
1365  *
1366  * First, the local_command_line() virtual function is invoked.
1367  * This function always runs on the local instance. It gets passed a pointer
1368  * to a %NULL-terminated copy of @argv and is expected to remove the arguments
1369  * that it handled (shifting up remaining arguments). See
1370  * <xref linkend="gapplication-example-cmdline2"/> for an example of
1371  * parsing @argv manually. Alternatively, you may use the #GOptionContext API,
1372  * after setting <literal>argc = g_strv_length (argv);</literal>.
1373  *
1374  * The last argument to local_command_line() is a pointer to the @status
1375  * variable which can used to set the exit status that is returned from
1376  * g_application_run().
1377  *
1378  * If local_command_line() returns %TRUE, the command line is expected
1379  * to be completely handled, including possibly registering as the primary
1380  * instance, calling g_application_activate() or g_application_open(), etc.
1381  *
1382  * If local_command_line() returns %FALSE then the application is registered
1383  * and the #GApplication::command-line signal is emitted in the primary
1384  * instance (which may or may not be this instance). The signal handler
1385  * gets passed a #GApplicationCommandLine object that (among other things)
1386  * contains the remaining commandline arguments that have not been handled
1387  * by local_command_line().
1388  *
1389  * If the application has the %G_APPLICATION_HANDLES_COMMAND_LINE
1390  * flag set then the default implementation of local_command_line()
1391  * always returns %FALSE immediately, resulting in the commandline
1392  * always being handled in the primary instance.
1393  *
1394  * Otherwise, the default implementation of local_command_line() tries
1395  * to do a couple of things that are probably reasonable for most
1396  * applications.  First, g_application_register() is called to attempt
1397  * to register the application.  If that works, then the command line
1398  * arguments are inspected.  If no commandline arguments are given, then
1399  * g_application_activate() is called.  If commandline arguments are
1400  * given and the %G_APPLICATION_HANDLES_OPEN flag is set then they
1401  * are assumed to be filenames and g_application_open() is called.
1402  *
1403  * If you need to handle commandline arguments that are not filenames,
1404  * and you don't mind commandline handling to happen in the primary
1405  * instance, you should set %G_APPLICATION_HANDLES_COMMAND_LINE and
1406  * process the commandline arguments in your #GApplication::command-line
1407  * signal handler, either manually or using the #GOptionContext API.
1408  *
1409  * If you are interested in doing more complicated local handling of the
1410  * commandline then you should implement your own #GApplication subclass
1411  * and override local_command_line(). In this case, you most likely want
1412  * to return %TRUE from your local_command_line() implementation to
1413  * suppress the default handling. See
1414  * <xref linkend="gapplication-example-cmdline2"/> for an example.
1415  *
1416  * If, after the above is done, the use count of the application is zero
1417  * then the exit status is returned immediately.  If the use count is
1418  * non-zero then the default main context is iterated until the use count
1419  * falls to zero, at which point 0 is returned.
1420  *
1421  * If the %G_APPLICATION_IS_SERVICE flag is set, then the exiting at
1422  * use count of zero is delayed for a while (ie: the instance stays
1423  * around to provide its <emphasis>service</emphasis> to others).
1424  *
1425  * Returns: the exit status
1426  *
1427  * Since: 2.28
1428  **/
1429 int
1430 g_application_run (GApplication  *application,
1431                    int            argc,
1432                    char         **argv)
1433 {
1434   gchar **arguments;
1435   int status;
1436   gint i;
1437
1438   g_return_val_if_fail (G_IS_APPLICATION (application), 1);
1439   g_return_val_if_fail (argc == 0 || argv != NULL, 1);
1440   g_return_val_if_fail (!application->priv->must_quit_now, 1);
1441
1442   arguments = g_new (gchar *, argc + 1);
1443   for (i = 0; i < argc; i++)
1444     arguments[i] = g_strdup (argv[i]);
1445   arguments[i] = NULL;
1446
1447   if (g_get_prgname () == NULL && argc > 0)
1448     {
1449       gchar *prgname;
1450
1451       prgname = g_path_get_basename (argv[0]);
1452       g_set_prgname (prgname);
1453       g_free (prgname);
1454     }
1455
1456   if (!G_APPLICATION_GET_CLASS (application)
1457         ->local_command_line (application, &arguments, &status))
1458     {
1459       GError *error = NULL;
1460
1461       if (!g_application_register (application, NULL, &error))
1462         {
1463           g_printerr ("%s", error->message);
1464           g_error_free (error);
1465           return 1;
1466         }
1467
1468       if (application->priv->is_remote)
1469         {
1470           GVariant *platform_data;
1471
1472           platform_data = get_platform_data (application);
1473           status = g_application_impl_command_line (application->priv->impl,
1474                                                     arguments, platform_data);
1475         }
1476       else
1477         {
1478           GApplicationCommandLine *cmdline;
1479           GVariant *v;
1480
1481           v = g_variant_new_bytestring_array ((const gchar **) arguments, -1);
1482           cmdline = g_object_new (G_TYPE_APPLICATION_COMMAND_LINE,
1483                                   "arguments", v, NULL);
1484           g_signal_emit (application,
1485                          g_application_signals[SIGNAL_COMMAND_LINE],
1486                          0, cmdline, &status);
1487           g_object_unref (cmdline);
1488         }
1489     }
1490
1491   g_strfreev (arguments);
1492
1493   if (application->priv->flags & G_APPLICATION_IS_SERVICE &&
1494       application->priv->is_registered &&
1495       !application->priv->use_count &&
1496       !application->priv->inactivity_timeout_id)
1497     {
1498       application->priv->inactivity_timeout_id =
1499         g_timeout_add (10000, inactivity_timeout_expired, application);
1500     }
1501
1502   while (application->priv->use_count || application->priv->inactivity_timeout_id)
1503     {
1504       if (application->priv->must_quit_now)
1505         break;
1506
1507       g_main_context_iteration (NULL, TRUE);
1508       status = 0;
1509     }
1510
1511   if (!application->priv->is_remote)
1512     {
1513       g_signal_emit (application, g_application_signals[SIGNAL_SHUTDOWN], 0);
1514
1515       if (!application->priv->did_shutdown)
1516         g_critical ("GApplication subclass '%s' failed to chain up on"
1517                     " ::shutdown (from end of override function)",
1518                     G_OBJECT_TYPE_NAME (application));
1519     }
1520
1521   if (application->priv->impl)
1522     g_application_impl_flush (application->priv->impl);
1523
1524   g_settings_sync ();
1525
1526   return status;
1527 }
1528
1529 static gchar **
1530 g_application_list_actions (GActionGroup *action_group)
1531 {
1532   GApplication *application = G_APPLICATION (action_group);
1533
1534   g_return_val_if_fail (application->priv->is_registered, NULL);
1535
1536   if (application->priv->remote_actions != NULL)
1537     return g_action_group_list_actions (G_ACTION_GROUP (application->priv->remote_actions));
1538
1539   else if (application->priv->actions != NULL)
1540     return g_action_group_list_actions (application->priv->actions);
1541
1542   else
1543     /* empty string array */
1544     return g_new0 (gchar *, 1);
1545 }
1546
1547 static gboolean
1548 g_application_query_action (GActionGroup        *group,
1549                             const gchar         *action_name,
1550                             gboolean            *enabled,
1551                             const GVariantType **parameter_type,
1552                             const GVariantType **state_type,
1553                             GVariant           **state_hint,
1554                             GVariant           **state)
1555 {
1556   GApplication *application = G_APPLICATION (group);
1557
1558   g_return_val_if_fail (application->priv->is_registered, FALSE);
1559
1560   if (application->priv->remote_actions != NULL)
1561     return g_action_group_query_action (G_ACTION_GROUP (application->priv->remote_actions),
1562                                         action_name,
1563                                         enabled,
1564                                         parameter_type,
1565                                         state_type,
1566                                         state_hint,
1567                                         state);
1568
1569   if (application->priv->actions != NULL)
1570     return g_action_group_query_action (application->priv->actions,
1571                                         action_name,
1572                                         enabled,
1573                                         parameter_type,
1574                                         state_type,
1575                                         state_hint,
1576                                         state);
1577
1578   return FALSE;
1579 }
1580
1581 static void
1582 g_application_change_action_state (GActionGroup *action_group,
1583                                    const gchar  *action_name,
1584                                    GVariant     *value)
1585 {
1586   GApplication *application = G_APPLICATION (action_group);
1587
1588   g_return_if_fail (application->priv->is_remote ||
1589                     application->priv->actions != NULL);
1590   g_return_if_fail (application->priv->is_registered);
1591
1592   if (application->priv->remote_actions)
1593     g_remote_action_group_change_action_state_full (application->priv->remote_actions,
1594                                                     action_name, value, get_platform_data (application));
1595
1596   else
1597     g_action_group_change_action_state (application->priv->actions, action_name, value);
1598 }
1599
1600 static void
1601 g_application_activate_action (GActionGroup *action_group,
1602                                const gchar  *action_name,
1603                                GVariant     *parameter)
1604 {
1605   GApplication *application = G_APPLICATION (action_group);
1606
1607   g_return_if_fail (application->priv->is_remote ||
1608                     application->priv->actions != NULL);
1609   g_return_if_fail (application->priv->is_registered);
1610
1611   if (application->priv->remote_actions)
1612     g_remote_action_group_activate_action_full (application->priv->remote_actions,
1613                                                 action_name, parameter, get_platform_data (application));
1614
1615   else
1616     g_action_group_activate_action (application->priv->actions, action_name, parameter);
1617 }
1618
1619 static GAction *
1620 g_application_lookup_action (GActionMap  *action_map,
1621                              const gchar *action_name)
1622 {
1623   GApplication *application = G_APPLICATION (action_map);
1624
1625   g_return_val_if_fail (G_IS_SIMPLE_ACTION_GROUP (application->priv->actions), NULL);
1626
1627   return g_simple_action_group_lookup (G_SIMPLE_ACTION_GROUP (application->priv->actions), action_name);
1628 }
1629
1630 static void
1631 g_application_add_action (GActionMap *action_map,
1632                           GAction    *action)
1633 {
1634   GApplication *application = G_APPLICATION (action_map);
1635
1636   g_return_if_fail (G_IS_SIMPLE_ACTION_GROUP (application->priv->actions));
1637
1638   g_simple_action_group_insert (G_SIMPLE_ACTION_GROUP (application->priv->actions), action);
1639 }
1640
1641 static void
1642 g_application_remove_action (GActionMap  *action_map,
1643                              const gchar *action_name)
1644 {
1645   GApplication *application = G_APPLICATION (action_map);
1646
1647   g_return_if_fail (G_IS_SIMPLE_ACTION_GROUP (application->priv->actions));
1648
1649   g_simple_action_group_remove (G_SIMPLE_ACTION_GROUP (application->priv->actions), action_name);
1650 }
1651
1652 static void
1653 g_application_action_group_iface_init (GActionGroupInterface *iface)
1654 {
1655   iface->list_actions = g_application_list_actions;
1656   iface->query_action = g_application_query_action;
1657   iface->change_action_state = g_application_change_action_state;
1658   iface->activate_action = g_application_activate_action;
1659 }
1660
1661 static void
1662 g_application_action_map_iface_init (GActionMapInterface *iface)
1663 {
1664   iface->lookup_action = g_application_lookup_action;
1665   iface->add_action = g_application_add_action;
1666   iface->remove_action = g_application_remove_action;
1667 }
1668
1669 /* Default Application {{{1 */
1670
1671 static GApplication *default_app;
1672
1673 /**
1674  * g_application_get_default:
1675  *
1676  * Returns the default #GApplication instance for this process.
1677  *
1678  * Normally there is only one #GApplication per process and it becomes
1679  * the default when it is created.  You can exercise more control over
1680  * this by using g_application_set_default().
1681  *
1682  * If there is no default application then %NULL is returned.
1683  *
1684  * Returns: (transfer none): the default application for this process, or %NULL
1685  *
1686  * Since: 2.32
1687  **/
1688 GApplication *
1689 g_application_get_default (void)
1690 {
1691   return default_app;
1692 }
1693
1694 /**
1695  * g_application_set_default:
1696  * @application: (allow-none): the application to set as default, or %NULL
1697  *
1698  * Sets or unsets the default application for the process, as returned
1699  * by g_application_get_default().
1700  *
1701  * This function does not take its own reference on @application.  If
1702  * @application is destroyed then the default application will revert
1703  * back to %NULL.
1704  *
1705  * Since: 2.32
1706  **/
1707 void
1708 g_application_set_default (GApplication *application)
1709 {
1710   default_app = application;
1711 }
1712
1713 /**
1714  * g_application_quit:
1715  * @application: a #GApplication
1716  *
1717  * Immediately quits the application.
1718  *
1719  * Upon return to the mainloop, g_application_run() will return,
1720  * calling only the 'shutdown' function before doing so.
1721  *
1722  * The hold count is ignored.
1723  *
1724  * The result of calling g_application_run() again after it returns is
1725  * unspecified.
1726  *
1727  * Since: 2.32
1728  **/
1729 void
1730 g_application_quit (GApplication *application)
1731 {
1732   g_return_if_fail (G_IS_APPLICATION (application));
1733
1734   application->priv->must_quit_now = TRUE;
1735 }
1736
1737 /* Epilogue {{{1 */
1738 /* vim:set foldmethod=marker: */