gio/gappinfo.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24 #include "gappinfo.h"
  25 #include "glibintl.h"
  26 #include <gioerror.h>
  27 #include <gfile.h>
  28
  29
  30 /**
  31  * SECTION:gappinfo
  32  * @short_description: Application information and launch contexts
  33  * @include: gio/gio.h
  34  *
  35  * #GAppInfo and #GAppLaunchContext are used for describing and launching
  36  * applications installed on the system.
  37  *
  38  * As of GLib 2.20, URIs will always be converted to POSIX paths
  39  * (using g_file_get_path()) when using g_app_info_launch() even if
  40  * the application requested an URI and not a POSIX path. For example
  41  * for an desktop-file based application with Exec key <literal>totem
  42  * &percnt;U</literal> and a single URI,
  43  * <literal>sftp://foo/file.avi</literal>, then
  44  * <literal>/home/user/.gvfs/sftp on foo/file.avi</literal> will be
  45  * passed. This will only work if a set of suitable GIO extensions
  46  * (such as gvfs 2.26 compiled with FUSE support), is available and
  47  * operational; if this is not the case, the URI will be passed
  48  * unmodified to the application. Some URIs, such as
  49  * <literal>mailto:</literal>, of course cannot be mapped to a POSIX
  50  * path (in gvfs there's no FUSE mount for it); such URIs will be
  51  * passed unmodified to the application.
  52  *
  53  * Specifically for gvfs 2.26 and later, the POSIX URI will be mapped
  54  * back to the GIO URI in the #GFile constructors (since gvfs
  55  * implements the #GVfs extension point). As such, if the application
  56  * needs to examine the URI, it needs to use g_file_get_uri() or
  57  * similar on #GFile. In other words, an application cannot assume
  58  * that the URI passed to e.g. g_file_new_for_commandline_arg() is
  59  * equal to the result of g_file_get_uri(). The following snippet
  60  * illustrates this:
  61  *
  62  * <programlisting>
  63  * GFile *f;
  64  * char *uri;
  65  *
  66  * file = g_file_new_for_commandline_arg (uri_from_commandline);
  67  *
  68  * uri = g_file_get_uri (file);
  69  * strcmp (uri, uri_from_commandline) == 0; // FALSE
  70  * g_free (uri);
  71  *
  72  * if (g_file_has_uri_scheme (file, "cdda"))
  73  *   {
  74  *     // do something special with uri
  75  *   }
  76  * g_object_unref (file);
  77  * </programlisting>
  78  *
  79  * This code will work when both <literal>cdda://sr0/Track
  80  * 1.wav</literal> and <literal>/home/user/.gvfs/cdda on sr0/Track
  81  * 1.wav</literal> is passed to the application. It should be noted
  82  * that it's generally not safe for applications to rely on the format
  83  * of a particular URIs. Different launcher applications (e.g. file
  84  * managers) may have different ideas of what a given URI means.
  85  *
  86  **/
  87
  88 typedef GAppInfoIface GAppInfoInterface;
  89 G_DEFINE_INTERFACE (GAppInfo, g_app_info, G_TYPE_OBJECT)
  90
  91 static void
  92 g_app_info_default_init (GAppInfoInterface *iface)
  93 {
  94 }
  95
  96
  97 /**
  98  * g_app_info_dup:
  99  * @appinfo: a #GAppInfo.
 100  *
 101  * Creates a duplicate of a #GAppInfo.
 102  *
 103  * Returns: (transfer full): a duplicate of @appinfo.
 104  **/
 105 GAppInfo *
 106 g_app_info_dup (GAppInfo *appinfo)
 107 {
 108   GAppInfoIface *iface;
 109
 110   g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
 111
 112   iface = G_APP_INFO_GET_IFACE (appinfo);
 113
 114   return (* iface->dup) (appinfo);
 115 }
 116
 117 /**
 118  * g_app_info_equal:
 119  * @appinfo1: the first #GAppInfo.
 120  * @appinfo2: the second #GAppInfo.
 121  *
 122  * Checks if two #GAppInfo<!-- -->s are equal.
 123  *
 124  * Returns: %TRUE if @appinfo1 is equal to @appinfo2. %FALSE otherwise.
 125  **/
 126 gboolean
 127 g_app_info_equal (GAppInfo *appinfo1,
 128                   GAppInfo *appinfo2)
 129 {
 130   GAppInfoIface *iface;
 131
 132   g_return_val_if_fail (G_IS_APP_INFO (appinfo1), FALSE);
 133   g_return_val_if_fail (G_IS_APP_INFO (appinfo2), FALSE);
 134
 135   if (G_TYPE_FROM_INSTANCE (appinfo1) != G_TYPE_FROM_INSTANCE (appinfo2))
 136     return FALSE;
 137
 138   iface = G_APP_INFO_GET_IFACE (appinfo1);
 139
 140   return (* iface->equal) (appinfo1, appinfo2);
 141 }
 142
 143 /**
 144  * g_app_info_get_id:
 145  * @appinfo: a #GAppInfo.
 146  *
 147  * Gets the ID of an application. An id is a string that
 148  * identifies the application. The exact format of the id is
 149  * platform dependent. For instance, on Unix this is the
 150  * desktop file id from the xdg menu specification.
 151  *
 152  * Note that the returned ID may be %NULL, depending on how
 153  * the @appinfo has been constructed.
 154  *
 155  * Returns: a string containing the application's ID.
 156  **/
 157 const char *
 158 g_app_info_get_id (GAppInfo *appinfo)
 159 {
 160   GAppInfoIface *iface;
 161
 162   g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
 163
 164   iface = G_APP_INFO_GET_IFACE (appinfo);
 165
 166   return (* iface->get_id) (appinfo);
 167 }
 168
 169 /**
 170  * g_app_info_get_name:
 171  * @appinfo: a #GAppInfo.
 172  *
 173  * Gets the installed name of the application.
 174  *
 175  * Returns: the name of the application for @appinfo.
 176  **/
 177 const char *
 178 g_app_info_get_name (GAppInfo *appinfo)
 179 {
 180   GAppInfoIface *iface;
 181
 182   g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
 183
 184   iface = G_APP_INFO_GET_IFACE (appinfo);
 185
 186   return (* iface->get_name) (appinfo);
 187 }
 188
 189 /**
 190  * g_app_info_get_display_name:
 191  * @appinfo: a #GAppInfo.
 192  *
 193  * Gets the display name of the application. The display name is often more
 194  * descriptive to the user than the name itself.
 195  *
 196  * Returns: the display name of the application for @appinfo, or the name if
 197  * no display name is available.
 198  *
 199  * Since: 2.24
 200  **/
 201 const char *
 202 g_app_info_get_display_name (GAppInfo *appinfo)
 203 {
 204   GAppInfoIface *iface;
 205
 206   g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
 207
 208   iface = G_APP_INFO_GET_IFACE (appinfo);
 209
 210   if (iface->get_display_name == NULL)
 211     return (* iface->get_name) (appinfo);
 212
 213   return (* iface->get_display_name) (appinfo);
 214 }
 215
 216 /**
 217  * g_app_info_get_description:
 218  * @appinfo: a #GAppInfo.
 219  *
 220  * Gets a human-readable description of an installed application.
 221  *
 222  * Returns: a string containing a description of the
 223  * application @appinfo, or %NULL if none.
 224  **/
 225 const char *
 226 g_app_info_get_description (GAppInfo *appinfo)
 227 {
 228   GAppInfoIface *iface;
 229
 230   g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
 231
 232   iface = G_APP_INFO_GET_IFACE (appinfo);
 233
 234   return (* iface->get_description) (appinfo);
 235 }
 236
 237 /**
 238  * g_app_info_get_executable:
 239  * @appinfo: a #GAppInfo
 240  *
 241  * Gets the executable's name for the installed application.
 242  *
 243  * Returns: a string containing the @appinfo's application
 244  * binaries name
 245  **/
 246 const char *
 247 g_app_info_get_executable (GAppInfo *appinfo)
 248 {
 249   GAppInfoIface *iface;
 250
 251   g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
 252
 253   iface = G_APP_INFO_GET_IFACE (appinfo);
 254
 255   return (* iface->get_executable) (appinfo);
 256 }
 257
 258
 259 /**
 260  * g_app_info_get_commandline:
 261  * @appinfo: a #GAppInfo
 262  *
 263  * Gets the commandline with which the application will be
 264  * started.
 265  *
 266  * Returns: a string containing the @appinfo's commandline,
 267  *     or %NULL if this information is not available
 268  *
 269  * Since: 2.20
 270  **/
 271 const char *
 272 g_app_info_get_commandline (GAppInfo *appinfo)
 273 {
 274   GAppInfoIface *iface;
 275
 276   g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
 277
 278   iface = G_APP_INFO_GET_IFACE (appinfo);
 279
 280   if (iface->get_commandline)
 281     return (* iface->get_commandline) (appinfo);
 282
 283   return NULL;
 284 }
 285
 286 /**
 287  * g_app_info_set_as_default_for_type:
 288  * @appinfo: a #GAppInfo.
 289  * @content_type: the content type.
 290  * @error: a #GError.
 291  *
 292  * Sets the application as the default handler for a given type.
 293  *
 294  * Returns: %TRUE on success, %FALSE on error.
 295  **/
 296 gboolean
 297 g_app_info_set_as_default_for_type (GAppInfo    *appinfo,
 298                                     const char  *content_type,
 299                                     GError     **error)
 300 {
 301   GAppInfoIface *iface;
 302
 303   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 304   g_return_val_if_fail (content_type != NULL, FALSE);
 305
 306   iface = G_APP_INFO_GET_IFACE (appinfo);
 307
 308   return (* iface->set_as_default_for_type) (appinfo, content_type, error);
 309 }
 310
 311 /**
 312  * g_app_info_set_as_last_used_for_type:
 313  * @appinfo: a #GAppInfo.
 314  * @content_type: the content type.
 315  * @error: a #GError.
 316  *
 317  * Sets the application as the last used application for a given type.
 318  * This will make the application appear as first in the list returned
 319  * by g_app_info_get_recommended_for_type(), regardless of the default
 320  * application for that content type.
 321  *
 322  * Returns: %TRUE on success, %FALSE on error.
 323  **/
 324 gboolean
 325 g_app_info_set_as_last_used_for_type (GAppInfo    *appinfo,
 326                                       const char  *content_type,
 327                                       GError     **error)
 328 {
 329   GAppInfoIface *iface;
 330
 331   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 332   g_return_val_if_fail (content_type != NULL, FALSE);
 333
 334   iface = G_APP_INFO_GET_IFACE (appinfo);
 335
 336   return (* iface->set_as_last_used_for_type) (appinfo, content_type, error);
 337 }
 338
 339 /**
 340  * g_app_info_set_as_default_for_extension:
 341  * @appinfo: a #GAppInfo.
 342  * @extension: a string containing the file extension (without the dot).
 343  * @error: a #GError.
 344  *
 345  * Sets the application as the default handler for the given file extension.
 346  *
 347  * Returns: %TRUE on success, %FALSE on error.
 348  **/
 349 gboolean
 350 g_app_info_set_as_default_for_extension (GAppInfo    *appinfo,
 351                                          const char  *extension,
 352                                          GError     **error)
 353 {
 354   GAppInfoIface *iface;
 355
 356   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 357   g_return_val_if_fail (extension != NULL, FALSE);
 358
 359   iface = G_APP_INFO_GET_IFACE (appinfo);
 360
 361   if (iface->set_as_default_for_extension)
 362     return (* iface->set_as_default_for_extension) (appinfo, extension, error);
 363
 364   g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 365                        "g_app_info_set_as_default_for_extension not supported yet");
 366   return FALSE;
 367 }
 368
 369
 370 /**
 371  * g_app_info_add_supports_type:
 372  * @appinfo: a #GAppInfo.
 373  * @content_type: a string.
 374  * @error: a #GError.
 375  *
 376  * Adds a content type to the application information to indicate the
 377  * application is capable of opening files with the given content type.
 378  *
 379  * Returns: %TRUE on success, %FALSE on error.
 380  **/
 381 gboolean
 382 g_app_info_add_supports_type (GAppInfo    *appinfo,
 383                               const char  *content_type,
 384                               GError     **error)
 385 {
 386   GAppInfoIface *iface;
 387
 388   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 389   g_return_val_if_fail (content_type != NULL, FALSE);
 390
 391   iface = G_APP_INFO_GET_IFACE (appinfo);
 392
 393   if (iface->add_supports_type)
 394     return (* iface->add_supports_type) (appinfo, content_type, error);
 395
 396   g_set_error_literal (error, G_IO_ERROR,
 397                        G_IO_ERROR_NOT_SUPPORTED,
 398                        "g_app_info_add_supports_type not supported yet");
 399
 400   return FALSE;
 401 }
 402
 403
 404 /**
 405  * g_app_info_can_remove_supports_type:
 406  * @appinfo: a #GAppInfo.
 407  *
 408  * Checks if a supported content type can be removed from an application.
 409  *
 410  * Returns: %TRUE if it is possible to remove supported
 411  *     content types from a given @appinfo, %FALSE if not.
 412  **/
 413 gboolean
 414 g_app_info_can_remove_supports_type (GAppInfo *appinfo)
 415 {
 416   GAppInfoIface *iface;
 417
 418   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 419
 420   iface = G_APP_INFO_GET_IFACE (appinfo);
 421
 422   if (iface->can_remove_supports_type)
 423     return (* iface->can_remove_supports_type) (appinfo);
 424
 425   return FALSE;
 426 }
 427
 428
 429 /**
 430  * g_app_info_remove_supports_type:
 431  * @appinfo: a #GAppInfo.
 432  * @content_type: a string.
 433  * @error: a #GError.
 434  *
 435  * Removes a supported type from an application, if possible.
 436  *
 437  * Returns: %TRUE on success, %FALSE on error.
 438  **/
 439 gboolean
 440 g_app_info_remove_supports_type (GAppInfo    *appinfo,
 441                                  const char  *content_type,
 442                                  GError     **error)
 443 {
 444   GAppInfoIface *iface;
 445
 446   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 447   g_return_val_if_fail (content_type != NULL, FALSE);
 448
 449   iface = G_APP_INFO_GET_IFACE (appinfo);
 450
 451   if (iface->remove_supports_type)
 452     return (* iface->remove_supports_type) (appinfo, content_type, error);
 453
 454   g_set_error_literal (error, G_IO_ERROR,
 455                        G_IO_ERROR_NOT_SUPPORTED,
 456                        "g_app_info_remove_supports_type not supported yet");
 457
 458   return FALSE;
 459 }
 460
 461
 462 /**
 463  * g_app_info_get_icon:
 464  * @appinfo: a #GAppInfo.
 465  *
 466  * Gets the icon for the application.
 467  *
 468  * Returns: (transfer none): the default #GIcon for @appinfo or %NULL
 469  * if there is no default icon.
 470  **/
 471 GIcon *
 472 g_app_info_get_icon (GAppInfo *appinfo)
 473 {
 474   GAppInfoIface *iface;
 475
 476   g_return_val_if_fail (G_IS_APP_INFO (appinfo), NULL);
 477
 478   iface = G_APP_INFO_GET_IFACE (appinfo);
 479
 480   return (* iface->get_icon) (appinfo);
 481 }
 482
 483
 484 /**
 485  * g_app_info_launch:
 486  * @appinfo: a #GAppInfo
 487  * @files: (element-type GFile): a #GList of #GFile objects
 488  * @launch_context: (allow-none): a #GAppLaunchContext or %NULL
 489  * @error: a #GError
 490  *
 491  * Launches the application. Passes @files to the launched application
 492  * as arguments, using the optional @launch_context to get information
 493  * about the details of the launcher (like what screen it is on).
 494  * On error, @error will be set accordingly.
 495  *
 496  * To launch the application without arguments pass a %NULL @files list.
 497  *
 498  * Note that even if the launch is successful the application launched
 499  * can fail to start if it runs into problems during startup. There is
 500  * no way to detect this.
 501  *
 502  * Some URIs can be changed when passed through a GFile (for instance
 503  * unsupported URIs with strange formats like mailto:), so if you have
 504  * a textual URI you want to pass in as argument, consider using
 505  * g_app_info_launch_uris() instead.
 506  *
 507  * The launched application inherits the environment of the launching
 508  * process, but it can be modified with g_app_launch_context_setenv() and
 509  * g_app_launch_context_unsetenv().
 510  *
 511  * On UNIX, this function sets the <envar>GIO_LAUNCHED_DESKTOP_FILE</envar>
 512  * environment variable with the path of the launched desktop file and
 513  * <envar>GIO_LAUNCHED_DESKTOP_FILE_PID</envar> to the process
 514  * id of the launched process. This can be used to ignore
 515  * <envar>GIO_LAUNCHED_DESKTOP_FILE</envar>, should it be inherited
 516  * by further processes. The <envar>DISPLAY</envar> and
 517  * <envar>DESKTOP_STARTUP_ID</envar> environment variables are also
 518  * set, based on information provided in @launch_context.
 519  *
 520  * Returns: %TRUE on successful launch, %FALSE otherwise.
 521  **/
 522 gboolean
 523 g_app_info_launch (GAppInfo           *appinfo,
 524                    GList              *files,
 525                    GAppLaunchContext  *launch_context,
 526                    GError            **error)
 527 {
 528   GAppInfoIface *iface;
 529
 530   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 531
 532   iface = G_APP_INFO_GET_IFACE (appinfo);
 533
 534   return (* iface->launch) (appinfo, files, launch_context, error);
 535 }
 536
 537
 538 /**
 539  * g_app_info_supports_uris:
 540  * @appinfo: a #GAppInfo.
 541  *
 542  * Checks if the application supports reading files and directories from URIs.
 543  *
 544  * Returns: %TRUE if the @appinfo supports URIs.
 545  **/
 546 gboolean
 547 g_app_info_supports_uris (GAppInfo *appinfo)
 548 {
 549   GAppInfoIface *iface;
 550
 551   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 552
 553   iface = G_APP_INFO_GET_IFACE (appinfo);
 554
 555   return (* iface->supports_uris) (appinfo);
 556 }
 557
 558
 559 /**
 560  * g_app_info_supports_files:
 561  * @appinfo: a #GAppInfo.
 562  *
 563  * Checks if the application accepts files as arguments.
 564  *
 565  * Returns: %TRUE if the @appinfo supports files.
 566  **/
 567 gboolean
 568 g_app_info_supports_files (GAppInfo *appinfo)
 569 {
 570   GAppInfoIface *iface;
 571
 572   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 573
 574   iface = G_APP_INFO_GET_IFACE (appinfo);
 575
 576   return (* iface->supports_files) (appinfo);
 577 }
 578
 579
 580 /**
 581  * g_app_info_launch_uris:
 582  * @appinfo: a #GAppInfo
 583  * @uris: (element-type utf8): a #GList containing URIs to launch.
 584  * @launch_context: (allow-none): a #GAppLaunchContext or %NULL
 585  * @error: a #GError
 586  *
 587  * Launches the application. This passes the @uris to the launched application
 588  * as arguments, using the optional @launch_context to get information
 589  * about the details of the launcher (like what screen it is on).
 590  * On error, @error will be set accordingly.
 591  *
 592  * To launch the application without arguments pass a %NULL @uris list.
 593  *
 594  * Note that even if the launch is successful the application launched
 595  * can fail to start if it runs into problems during startup. There is
 596  * no way to detect this.
 597  *
 598  * Returns: %TRUE on successful launch, %FALSE otherwise.
 599  **/
 600 gboolean
 601 g_app_info_launch_uris (GAppInfo           *appinfo,
 602                         GList              *uris,
 603                         GAppLaunchContext  *launch_context,
 604                         GError            **error)
 605 {
 606   GAppInfoIface *iface;
 607
 608   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 609
 610   iface = G_APP_INFO_GET_IFACE (appinfo);
 611
 612   return (* iface->launch_uris) (appinfo, uris, launch_context, error);
 613 }
 614
 615
 616 /**
 617  * g_app_info_should_show:
 618  * @appinfo: a #GAppInfo.
 619  *
 620  * Checks if the application info should be shown in menus that
 621  * list available applications.
 622  *
 623  * Returns: %TRUE if the @appinfo should be shown, %FALSE otherwise.
 624  **/
 625 gboolean
 626 g_app_info_should_show (GAppInfo *appinfo)
 627 {
 628   GAppInfoIface *iface;
 629
 630   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 631
 632   iface = G_APP_INFO_GET_IFACE (appinfo);
 633
 634   return (* iface->should_show) (appinfo);
 635 }
 636
 637 /**
 638  * g_app_info_launch_default_for_uri:
 639  * @uri: the uri to show
 640  * @launch_context: (allow-none): an optional #GAppLaunchContext.
 641  * @error: a #GError.
 642  *
 643  * Utility function that launches the default application
 644  * registered to handle the specified uri. Synchronous I/O
 645  * is done on the uri to detect the type of the file if
 646  * required.
 647  *
 648  * Returns: %TRUE on success, %FALSE on error.
 649  **/
 650 gboolean
 651 g_app_info_launch_default_for_uri (const char         *uri,
 652                                    GAppLaunchContext  *launch_context,
 653                                    GError            **error)
 654 {
 655   GAppInfo *app_info;
 656   GFile *file;
 657   GList l;
 658   gboolean res;
 659
 660   file = g_file_new_for_uri (uri);
 661   app_info = g_file_query_default_handler (file, NULL, error);
 662   g_object_unref (file);
 663   if (app_info == NULL)
 664     return FALSE;
 665
 666   /* Use the uri, not the GFile, as the GFile roundtrip may
 667    * affect the uri which we don't want (for instance for a
 668    * mailto: uri).
 669    */
 670   l.data = (char *)uri;
 671   l.next = l.prev = NULL;
 672   res = g_app_info_launch_uris (app_info, &l,
 673                                 launch_context, error);
 674
 675   g_object_unref (app_info);
 676
 677   return res;
 678 }
 679
 680 /**
 681  * g_app_info_can_delete:
 682  * @appinfo: a #GAppInfo
 683  *
 684  * Obtains the information whether the #GAppInfo can be deleted.
 685  * See g_app_info_delete().
 686  *
 687  * Returns: %TRUE if @appinfo can be deleted
 688  *
 689  * Since: 2.20
 690  */
 691 gboolean
 692 g_app_info_can_delete (GAppInfo *appinfo)
 693 {
 694   GAppInfoIface *iface;
 695
 696   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 697
 698   iface = G_APP_INFO_GET_IFACE (appinfo);
 699
 700   if (iface->can_delete)
 701     return (* iface->can_delete) (appinfo);
 702
 703   return FALSE;
 704 }
 705
 706
 707 /**
 708  * g_app_info_delete:
 709  * @appinfo: a #GAppInfo
 710  *
 711  * Tries to delete a #GAppInfo.
 712  *
 713  * On some platforms, there may be a difference between user-defined
 714  * #GAppInfo<!-- -->s which can be deleted, and system-wide ones which
 715  * cannot. See g_app_info_can_delete().
 716  *
 717  * Virtual: do_delete
 718  * Returns: %TRUE if @appinfo has been deleted
 719  *
 720  * Since: 2.20
 721  */
 722 gboolean
 723 g_app_info_delete (GAppInfo *appinfo)
 724 {
 725   GAppInfoIface *iface;
 726
 727   g_return_val_if_fail (G_IS_APP_INFO (appinfo), FALSE);
 728
 729   iface = G_APP_INFO_GET_IFACE (appinfo);
 730
 731   if (iface->do_delete)
 732     return (* iface->do_delete) (appinfo);
 733
 734   return FALSE;
 735 }
 736
 737
 738 G_DEFINE_TYPE (GAppLaunchContext, g_app_launch_context, G_TYPE_OBJECT);
 739
 740 struct _GAppLaunchContextPrivate {
 741   char **envp;
 742 };
 743
 744 /**
 745  * g_app_launch_context_new:
 746  *
 747  * Creates a new application launch context. This is not normally used,
 748  * instead you instantiate a subclass of this, such as #GdkAppLaunchContext.
 749  *
 750  * Returns: a #GAppLaunchContext.
 751  **/
 752 GAppLaunchContext *
 753 g_app_launch_context_new (void)
 754 {
 755   return g_object_new (G_TYPE_APP_LAUNCH_CONTEXT, NULL);
 756 }
 757
 758 static void
 759 g_app_launch_context_finalize (GObject *object)
 760 {
 761   GAppLaunchContext *context = G_APP_LAUNCH_CONTEXT (object);
 762
 763   g_strfreev (context->priv->envp);
 764
 765   G_OBJECT_CLASS (g_app_launch_context_parent_class)->finalize (object);
 766 }
 767
 768 static void
 769 g_app_launch_context_class_init (GAppLaunchContextClass *klass)
 770 {
 771   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 772
 773   g_type_class_add_private (klass, sizeof (GAppLaunchContextPrivate));
 774
 775   object_class->finalize = g_app_launch_context_finalize;
 776 }
 777
 778 static void
 779 g_app_launch_context_init (GAppLaunchContext *context)
 780 {
 781   context->priv = G_TYPE_INSTANCE_GET_PRIVATE (context, G_TYPE_APP_LAUNCH_CONTEXT, GAppLaunchContextPrivate);
 782 }
 783
 784 /**
 785  * g_app_launch_context_setenv:
 786  * @context: a #GAppLaunchContext
 787  * @variable: the environment variable to set
 788  * @value: the value for to set the variable to.
 789  *
 790  * Arranges for @variable to be set to @value in the child's
 791  * environment when @context is used to launch an application.
 792  *
 793  * Since: 2.32
 794  */
 795 void
 796 g_app_launch_context_setenv (GAppLaunchContext *context,
 797                              const char        *variable,
 798                              const char        *value)
 799 {
 800   if (!context->priv->envp)
 801     context->priv->envp = g_get_environ ();
 802
 803   context->priv->envp =
 804     g_environ_setenv (context->priv->envp, variable, value, TRUE);
 805 }
 806
 807 /**
 808  * g_app_launch_context_unsetenv:
 809  * @context: a #GAppLaunchContext
 810  * @variable: the environment variable to remove
 811  *
 812  * Arranges for @variable to be unset in the child's environment
 813  * when @context is used to launch an application.
 814  *
 815  * Since: 2.32
 816  */
 817 void
 818 g_app_launch_context_unsetenv (GAppLaunchContext *context,
 819                                const char        *variable)
 820 {
 821   if (!context->priv->envp)
 822     context->priv->envp = g_get_environ ();
 823
 824   context->priv->envp =
 825     g_environ_unsetenv (context->priv->envp, variable);
 826 }
 827
 828 /**
 829  * g_app_launch_context_get_environment:
 830  * @context: a #GAppLaunchContext
 831  *
 832  * Gets the complete environment variable list to be passed to
 833  * the child process when @context is used to launch an application.
 834  * This is a %NULL-terminated array of strings, where each string has
 835  * the form <literal>KEY=VALUE</literal>.
 836  *
 837  * Return value: (array zero-terminated=1) (transfer full): the
 838  *     child's environment
 839  *
 840  * Since: 2.32
 841  */
 842 char **
 843 g_app_launch_context_get_environment (GAppLaunchContext *context)
 844 {
 845   if (!context->priv->envp)
 846     context->priv->envp = g_get_environ ();
 847
 848   return g_strdupv (context->priv->envp);
 849 }
 850
 851 /**
 852  * g_app_launch_context_get_display:
 853  * @context: a #GAppLaunchContext
 854  * @info: a #GAppInfo
 855  * @files: (element-type GFile): a #GList of #GFile objects
 856  *
 857  * Gets the display string for the @context. This is used to ensure new
 858  * applications are started on the same display as the launching
 859  * application, by setting the <envar>DISPLAY</envar> environment variable.
 860  *
 861  * Returns: a display string for the display.
 862  */
 863 char *
 864 g_app_launch_context_get_display (GAppLaunchContext *context,
 865                                   GAppInfo          *info,
 866                                   GList             *files)
 867 {
 868   GAppLaunchContextClass *class;
 869
 870   g_return_val_if_fail (G_IS_APP_LAUNCH_CONTEXT (context), NULL);
 871   g_return_val_if_fail (G_IS_APP_INFO (info), NULL);
 872
 873   class = G_APP_LAUNCH_CONTEXT_GET_CLASS (context);
 874
 875   if (class->get_display == NULL)
 876     return NULL;
 877
 878   return class->get_display (context, info, files);
 879 }
 880
 881 /**
 882  * g_app_launch_context_get_startup_notify_id:
 883  * @context: a #GAppLaunchContext
 884  * @info: a #GAppInfo
 885  * @files: (element-type GFile): a #GList of of #GFile objects
 886  *
 887  * Initiates startup notification for the application and returns the
 888  * <envar>DESKTOP_STARTUP_ID</envar> for the launched operation,
 889  * if supported.
 890  *
 891  * Startup notification IDs are defined in the <ulink
 892  * url="http://standards.freedesktop.org/startup-notification-spec/startup-notification-latest.txt">
 893  * FreeDesktop.Org Startup Notifications standard</ulink>.
 894  *
 895  * Returns: a startup notification ID for the application, or %NULL if
 896  *     not supported.
 897  **/
 898 char *
 899 g_app_launch_context_get_startup_notify_id (GAppLaunchContext *context,
 900                                             GAppInfo          *info,
 901                                             GList             *files)
 902 {
 903   GAppLaunchContextClass *class;
 904
 905   g_return_val_if_fail (G_IS_APP_LAUNCH_CONTEXT (context), NULL);
 906   g_return_val_if_fail (G_IS_APP_INFO (info), NULL);
 907
 908   class = G_APP_LAUNCH_CONTEXT_GET_CLASS (context);
 909
 910   if (class->get_startup_notify_id == NULL)
 911     return NULL;
 912
 913   return class->get_startup_notify_id (context, info, files);
 914 }
 915
 916
 917 /**
 918  * g_app_launch_context_launch_failed:
 919  * @context: a #GAppLaunchContext.
 920  * @startup_notify_id: the startup notification id that was returned by g_app_launch_context_get_startup_notify_id().
 921  *
 922  * Called when an application has failed to launch, so that it can cancel
 923  * the application startup notification started in g_app_launch_context_get_startup_notify_id().
 924  *
 925  **/
 926 void
 927 g_app_launch_context_launch_failed (GAppLaunchContext *context,
 928                                     const char        *startup_notify_id)
 929 {
 930   GAppLaunchContextClass *class;
 931
 932   g_return_if_fail (G_IS_APP_LAUNCH_CONTEXT (context));
 933   g_return_if_fail (startup_notify_id != NULL);
 934
 935   class = G_APP_LAUNCH_CONTEXT_GET_CLASS (context);
 936
 937   if (class->launch_failed != NULL)
 938     class->launch_failed (context, startup_notify_id);
 939 }