gio/gapplicationcommandline.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
   6  * published by the Free Software Foundation; either version 2 of the
   7  * licence or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful, but
  10  * 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 Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
  17  * USA.
  18  *
  19  * Authors: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 #include "config.h"
  23
  24 #include "gapplicationcommandline.h"
  25
  26 #include "glibintl.h"
  27 #include "gfile.h"
  28
  29 #include <string.h>
  30 #include <stdio.h>
  31
  32 #ifdef G_OS_UNIX
  33 #include "gunixinputstream.h"
  34 #endif
  35
  36 #ifdef G_OS_WIN32
  37 #include <windows.h>
  38 #undef environ
  39 #include "gwin32inputstream.h"
  40 #endif
  41
  42 /**
  43  * SECTION:gapplicationcommandline
  44  * @title: GApplicationCommandLine
  45  * @short_description: A command-line invocation of an application
  46  * @see_also: #GApplication
  47  *
  48  * #GApplicationCommandLine represents a command-line invocation of
  49  * an application.  It is created by #GApplication and emitted
  50  * in the #GApplication::command-line signal and virtual function.
  51  *
  52  * The class contains the list of arguments that the program was invoked
  53  * with.  It is also possible to query if the commandline invocation was
  54  * local (ie: the current process is running in direct response to the
  55  * invocation) or remote (ie: some other process forwarded the
  56  * commandline to this process).
  57  *
  58  * The GApplicationCommandLine object can provide the @argc and @argv
  59  * parameters for use with the #GOptionContext command-line parsing API,
  60  * with the g_application_command_line_get_arguments() function. See
  61  * <xref linkend="gapplication-example-cmdline3"/> for an example.
  62  *
  63  * The exit status of the originally-invoked process may be set and
  64  * messages can be printed to stdout or stderr of that process.  The
  65  * lifecycle of the originally-invoked process is tied to the lifecycle
  66  * of this object (ie: the process exits when the last reference is
  67  * dropped).
  68  *
  69  * The main use for #GApplicationCommandLine (and the
  70  * #GApplication::command-line signal) is 'Emacs server' like use cases:
  71  * You can set the <envar>EDITOR</envar> environment variable to have
  72  * e.g. git use your favourite editor to edit commit messages, and if you
  73  * already have an instance of the editor running, the editing will happen
  74  * in the running instance, instead of opening a new one. An important
  75  * aspect of this use case is that the process that gets started by git
  76  * does not return until the editing is done.
  77  *
  78  * <example id="gapplication-example-cmdline"><title>Handling commandline arguments with GApplication</title>
  79  * <para>
  80  * A simple example where the commandline is completely handled
  81  * in the #GApplication::command-line handler. The launching instance exits
  82  * once the signal handler in the primary instance has returned, and the
  83  * return value of the signal handler becomes the exit status of the launching
  84  * instance.
  85  * </para>
  86  * <programlisting>
  87  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-cmdline.c">
  88  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
  89  * </xi:include>
  90  * </programlisting>
  91  * </example>
  92  *
  93  * <example id="gapplication-example-cmdline2"><title>Split commandline handling</title>
  94  * <para>
  95  * An example of split commandline handling. Options that start with
  96  * <literal>--local-</literal> are handled locally, all other options are
  97  * passed to the #GApplication::command-line handler which runs in the primary
  98  * instance.
  99  * </para>
 100  * <programlisting>
 101  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-cmdline2.c">
 102  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 103  * </xi:include>
 104  * </programlisting>
 105  * </example>
 106  *
 107  * <example id="gapplication-example-cmdline3"><title>Deferred commandline handling</title>
 108  * <para>
 109  * An example of deferred commandline handling. Here, the commandline is
 110  * not completely handled before the #GApplication::command-line handler
 111  * returns. Instead, we keep a reference to the GApplicationCommandLine
 112  * object and handle it later(in this example, in an idle). Note that it
 113  * is necessary to hold the application until you are done with the
 114  * commandline.
 115  * </para>
 116  * <para>
 117  * This example also shows how to use #GOptionContext for parsing the
 118  * commandline arguments. Note that it is necessary to disable the
 119  * built-in help-handling of #GOptionContext, since it calls exit()
 120  * after printing help, which is not what you want to happen in
 121  * the primary instance.
 122  * </para>
 123  * <programlisting>
 124  * <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-cmdline3.c">
 125  *   <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 126  * </xi:include>
 127  * </programlisting>
 128  * </example>
 129  **/
 130
 131 /**
 132  * GApplicationCommandLineClass:
 133  *
 134  * The <structname>GApplicationCommandLineClass</structname> structure
 135  * contains private data only
 136  *
 137  * Since: 2.28
 138  **/
 139 enum
 140 {
 141   PROP_NONE,
 142   PROP_ARGUMENTS,
 143   PROP_PLATFORM_DATA,
 144   PROP_IS_REMOTE
 145 };
 146
 147 struct _GApplicationCommandLinePrivate
 148 {
 149   GVariant *platform_data;
 150   GVariant *arguments;
 151   gchar *cwd;
 152
 153   gchar **environ;
 154   gint exit_status;
 155 };
 156
 157 G_DEFINE_TYPE_WITH_PRIVATE (GApplicationCommandLine, g_application_command_line, G_TYPE_OBJECT)
 158
 159 /* All subclasses represent remote invocations of some kind. */
 160 #define IS_REMOTE(cmdline) (G_TYPE_FROM_INSTANCE (cmdline) != \
 161                             G_TYPE_APPLICATION_COMMAND_LINE)
 162
 163 static void
 164 grok_platform_data (GApplicationCommandLine *cmdline)
 165 {
 166   GVariantIter iter;
 167   const gchar *key;
 168   GVariant *value;
 169
 170   g_variant_iter_init (&iter, cmdline->priv->platform_data);
 171
 172   while (g_variant_iter_loop (&iter, "{&sv}", &key, &value))
 173     if (strcmp (key, "cwd") == 0)
 174       {
 175         if (!cmdline->priv->cwd)
 176           cmdline->priv->cwd = g_variant_dup_bytestring (value, NULL);
 177       }
 178
 179     else if (strcmp (key, "environ") == 0)
 180       {
 181         if (!cmdline->priv->environ)
 182           cmdline->priv->environ =
 183             g_variant_dup_bytestring_array (value, NULL);
 184       }
 185 }
 186
 187 static void
 188 g_application_command_line_real_print_literal (GApplicationCommandLine *cmdline,
 189                                                const gchar             *message)
 190 {
 191   g_print ("%s", message);
 192 }
 193
 194 static void
 195 g_application_command_line_real_printerr_literal (GApplicationCommandLine *cmdline,
 196                                                   const gchar             *message)
 197 {
 198   g_printerr ("%s", message);
 199 }
 200
 201 static GInputStream *
 202 g_application_command_line_real_get_stdin (GApplicationCommandLine *cmdline)
 203 {
 204 #ifdef G_OS_UNIX
 205   return g_unix_input_stream_new (0, FALSE);
 206 #else
 207   return g_win32_input_stream_new (GetStdHandle (STD_INPUT_HANDLE), FALSE);
 208 #endif
 209 }
 210
 211 static void
 212 g_application_command_line_get_property (GObject    *object,
 213                                          guint       prop_id,
 214                                          GValue     *value,
 215                                          GParamSpec *pspec)
 216 {
 217   GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
 218
 219   switch (prop_id)
 220     {
 221     case PROP_ARGUMENTS:
 222       g_value_set_variant (value, cmdline->priv->arguments);
 223       break;
 224
 225     case PROP_PLATFORM_DATA:
 226       g_value_set_variant (value, cmdline->priv->platform_data);
 227       break;
 228
 229     case PROP_IS_REMOTE:
 230       g_value_set_boolean (value, IS_REMOTE (cmdline));
 231       break;
 232
 233     default:
 234       g_assert_not_reached ();
 235     }
 236 }
 237
 238 static void
 239 g_application_command_line_set_property (GObject      *object,
 240                                          guint         prop_id,
 241                                          const GValue *value,
 242                                          GParamSpec   *pspec)
 243 {
 244   GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
 245
 246   switch (prop_id)
 247     {
 248     case PROP_ARGUMENTS:
 249       g_assert (cmdline->priv->arguments == NULL);
 250       cmdline->priv->arguments = g_value_dup_variant (value);
 251       break;
 252
 253     case PROP_PLATFORM_DATA:
 254       g_assert (cmdline->priv->platform_data == NULL);
 255       cmdline->priv->platform_data = g_value_dup_variant (value);
 256       if (cmdline->priv->platform_data != NULL)
 257         grok_platform_data (cmdline);
 258       break;
 259
 260     default:
 261       g_assert_not_reached ();
 262     }
 263 }
 264
 265 static void
 266 g_application_command_line_finalize (GObject *object)
 267 {
 268   GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
 269
 270   if (cmdline->priv->platform_data)
 271     g_variant_unref (cmdline->priv->platform_data);
 272   if (cmdline->priv->arguments)
 273     g_variant_unref (cmdline->priv->arguments);
 274
 275   g_free (cmdline->priv->cwd);
 276   g_strfreev (cmdline->priv->environ);
 277
 278   G_OBJECT_CLASS (g_application_command_line_parent_class)
 279     ->finalize (object);
 280 }
 281
 282 static void
 283 g_application_command_line_init (GApplicationCommandLine *cmdline)
 284 {
 285   cmdline->priv = g_application_command_line_get_instance_private (cmdline);
 286 }
 287
 288 static void
 289 g_application_command_line_constructed (GObject *object)
 290 {
 291   GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
 292
 293   if (IS_REMOTE (cmdline))
 294     return;
 295
 296   /* In the local case, set cmd and environ */
 297   if (!cmdline->priv->cwd)
 298     cmdline->priv->cwd = g_get_current_dir ();
 299
 300   if (!cmdline->priv->environ)
 301     cmdline->priv->environ = g_get_environ ();
 302 }
 303
 304 static void
 305 g_application_command_line_class_init (GApplicationCommandLineClass *class)
 306 {
 307   GObjectClass *object_class = G_OBJECT_CLASS (class);
 308
 309   object_class->get_property = g_application_command_line_get_property;
 310   object_class->set_property = g_application_command_line_set_property;
 311   object_class->finalize = g_application_command_line_finalize;
 312   object_class->constructed = g_application_command_line_constructed;
 313
 314   class->printerr_literal = g_application_command_line_real_printerr_literal;
 315   class->print_literal = g_application_command_line_real_print_literal;
 316   class->get_stdin = g_application_command_line_real_get_stdin;
 317
 318   g_object_class_install_property (object_class, PROP_ARGUMENTS,
 319     g_param_spec_variant ("arguments",
 320                           P_("Commandline arguments"),
 321                           P_("The commandline that caused this ::command-line signal emission"),
 322                           G_VARIANT_TYPE_BYTESTRING_ARRAY, NULL,
 323                           G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
 324                           G_PARAM_STATIC_STRINGS));
 325
 326   g_object_class_install_property (object_class, PROP_PLATFORM_DATA,
 327     g_param_spec_variant ("platform-data",
 328                           P_("Platform data"),
 329                           P_("Platform-specific data for the commandline"),
 330                           G_VARIANT_TYPE ("a{sv}"), NULL,
 331                           G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
 332                           G_PARAM_STATIC_STRINGS));
 333
 334   g_object_class_install_property (object_class, PROP_IS_REMOTE,
 335     g_param_spec_boolean ("is-remote",
 336                           P_("Is remote"),
 337                           P_("TRUE if this is a remote commandline"),
 338                           FALSE,
 339                           G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
 340 }
 341
 342
 343 /**
 344  * g_application_command_line_get_arguments:
 345  * @cmdline: a #GApplicationCommandLine
 346  * @argc: (out) (allow-none): the length of the arguments array, or %NULL
 347  *
 348  * Gets the list of arguments that was passed on the command line.
 349  *
 350  * The strings in the array may contain non-utf8 data.
 351  *
 352  * The return value is %NULL-terminated and should be freed using
 353  * g_strfreev().
 354  *
 355  * Returns: (array length=argc) (transfer full): the string array
 356  * containing the arguments (the argv)
 357  *
 358  * Since: 2.28
 359  **/
 360 gchar **
 361 g_application_command_line_get_arguments (GApplicationCommandLine *cmdline,
 362                                           int                     *argc)
 363 {
 364   gchar **argv;
 365   gsize len;
 366
 367   g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), NULL);
 368
 369   argv = g_variant_dup_bytestring_array (cmdline->priv->arguments, &len);
 370
 371   if (argc)
 372     *argc = len;
 373
 374   return argv;
 375 }
 376
 377 /**
 378  * g_application_command_line_get_stdin:
 379  * @cmdline: a #GApplicationCommandLine
 380  *
 381  * Gets the stdin of the invoking process.
 382  *
 383  * The #GInputStream can be used to read data passed to the standard
 384  * input of the invoking process.
 385  * This doesn't work on all platforms.  Presently, it is only available
 386  * on UNIX when using a DBus daemon capable of passing file descriptors.
 387  * If stdin is not available then %NULL will be returned.  In the
 388  * future, support may be expanded to other platforms.
 389  *
 390  * You must only call this function once per commandline invocation.
 391  *
 392  * Returns: (transfer full): a #GInputStream for stdin
 393  *
 394  * Since: 2.34
 395  **/
 396 GInputStream *
 397 g_application_command_line_get_stdin (GApplicationCommandLine *cmdline)
 398 {
 399   return G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)->get_stdin (cmdline);
 400 }
 401
 402 /**
 403  * g_application_command_line_get_cwd:
 404  * @cmdline: a #GApplicationCommandLine
 405  *
 406  * Gets the working directory of the command line invocation.
 407  * The string may contain non-utf8 data.
 408  *
 409  * It is possible that the remote application did not send a working
 410  * directory, so this may be %NULL.
 411  *
 412  * The return value should not be modified or freed and is valid for as
 413  * long as @cmdline exists.
 414  *
 415  * Returns: the current directory, or %NULL
 416  *
 417  * Since: 2.28
 418  **/
 419 const gchar *
 420 g_application_command_line_get_cwd (GApplicationCommandLine *cmdline)
 421 {
 422   return cmdline->priv->cwd;
 423 }
 424
 425 /**
 426  * g_application_command_line_get_environ:
 427  * @cmdline: a #GApplicationCommandLine
 428  *
 429  * Gets the contents of the 'environ' variable of the command line
 430  * invocation, as would be returned by g_get_environ(), ie as a
 431  * %NULL-terminated list of strings in the form 'NAME=VALUE'.
 432  * The strings may contain non-utf8 data.
 433  *
 434  * The remote application usually does not send an environment.  Use
 435  * %G_APPLICATION_SEND_ENVIRONMENT to affect that.  Even with this flag
 436  * set it is possible that the environment is still not available (due
 437  * to invocation messages from other applications).
 438  *
 439  * The return value should not be modified or freed and is valid for as
 440  * long as @cmdline exists.
 441  *
 442  * See g_application_command_line_getenv() if you are only interested
 443  * in the value of a single environment variable.
 444  *
 445  * Returns: (array zero-terminated=1) (transfer none): the environment
 446  * strings, or %NULL if they were not sent
 447  *
 448  * Since: 2.28
 449  **/
 450 const gchar * const *
 451 g_application_command_line_get_environ (GApplicationCommandLine *cmdline)
 452 {
 453   return (const gchar **)cmdline->priv->environ;
 454 }
 455
 456 /**
 457  * g_application_command_line_getenv:
 458  * @cmdline: a #GApplicationCommandLine
 459  * @name: the environment variable to get
 460  *
 461  * Gets the value of a particular environment variable of the command
 462  * line invocation, as would be returned by g_getenv().  The strings may
 463  * contain non-utf8 data.
 464  *
 465  * The remote application usually does not send an environment.  Use
 466  * %G_APPLICATION_SEND_ENVIRONMENT to affect that.  Even with this flag
 467  * set it is possible that the environment is still not available (due
 468  * to invocation messages from other applications).
 469  *
 470  * The return value should not be modified or freed and is valid for as
 471  * long as @cmdline exists.
 472  *
 473  * Returns: the value of the variable, or %NULL if unset or unsent
 474  *
 475  * Since: 2.28
 476  **/
 477 const gchar *
 478 g_application_command_line_getenv (GApplicationCommandLine *cmdline,
 479                                    const gchar             *name)
 480 {
 481   gint length = strlen (name);
 482   gint i;
 483
 484   /* TODO: expand on windows */
 485   if (cmdline->priv->environ)
 486     for (i = 0; cmdline->priv->environ[i]; i++)
 487       if (strncmp (cmdline->priv->environ[i], name, length) == 0 &&
 488           cmdline->priv->environ[i][length] == '=')
 489         return cmdline->priv->environ[i] + length + 1;
 490
 491   return NULL;
 492 }
 493
 494 /**
 495  * g_application_command_line_get_is_remote:
 496  * @cmdline: a #GApplicationCommandLine
 497  *
 498  * Determines if @cmdline represents a remote invocation.
 499  *
 500  * Returns: %TRUE if the invocation was remote
 501  *
 502  * Since: 2.28
 503  **/
 504 gboolean
 505 g_application_command_line_get_is_remote (GApplicationCommandLine *cmdline)
 506 {
 507   return IS_REMOTE (cmdline);
 508 }
 509
 510 /**
 511  * g_application_command_line_print:
 512  * @cmdline: a #GApplicationCommandLine
 513  * @format: a printf-style format string
 514  * @...: arguments, as per @format
 515  *
 516  * Formats a message and prints it using the stdout print handler in the
 517  * invoking process.
 518  *
 519  * If @cmdline is a local invocation then this is exactly equivalent to
 520  * g_print().  If @cmdline is remote then this is equivalent to calling
 521  * g_print() in the invoking process.
 522  *
 523  * Since: 2.28
 524  **/
 525 void
 526 g_application_command_line_print (GApplicationCommandLine *cmdline,
 527                                   const gchar             *format,
 528                                   ...)
 529 {
 530   gchar *message;
 531   va_list ap;
 532
 533   g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
 534   g_return_if_fail (format != NULL);
 535
 536   va_start (ap, format);
 537   message = g_strdup_vprintf (format, ap);
 538   va_end (ap);
 539
 540   G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)
 541     ->print_literal (cmdline, message);
 542   g_free (message);
 543 }
 544
 545 /**
 546  * g_application_command_line_printerr:
 547  * @cmdline: a #GApplicationCommandLine
 548  * @format: a printf-style format string
 549  * @...: arguments, as per @format
 550  *
 551  * Formats a message and prints it using the stderr print handler in the
 552  * invoking process.
 553  *
 554  * If @cmdline is a local invocation then this is exactly equivalent to
 555  * g_printerr().  If @cmdline is remote then this is equivalent to
 556  * calling g_printerr() in the invoking process.
 557  *
 558  * Since: 2.28
 559  **/
 560 void
 561 g_application_command_line_printerr (GApplicationCommandLine *cmdline,
 562                                      const gchar             *format,
 563                                      ...)
 564 {
 565   gchar *message;
 566   va_list ap;
 567
 568   g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
 569   g_return_if_fail (format != NULL);
 570
 571   va_start (ap, format);
 572   message = g_strdup_vprintf (format, ap);
 573   va_end (ap);
 574
 575   G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)
 576     ->printerr_literal (cmdline, message);
 577   g_free (message);
 578 }
 579
 580 /**
 581  * g_application_command_line_set_exit_status:
 582  * @cmdline: a #GApplicationCommandLine
 583  * @exit_status: the exit status
 584  *
 585  * Sets the exit status that will be used when the invoking process
 586  * exits.
 587  *
 588  * The return value of the #GApplication::command-line signal is
 589  * passed to this function when the handler returns.  This is the usual
 590  * way of setting the exit status.
 591  *
 592  * In the event that you want the remote invocation to continue running
 593  * and want to decide on the exit status in the future, you can use this
 594  * call.  For the case of a remote invocation, the remote process will
 595  * typically exit when the last reference is dropped on @cmdline.  The
 596  * exit status of the remote process will be equal to the last value
 597  * that was set with this function.
 598  *
 599  * In the case that the commandline invocation is local, the situation
 600  * is slightly more complicated.  If the commandline invocation results
 601  * in the mainloop running (ie: because the use-count of the application
 602  * increased to a non-zero value) then the application is considered to
 603  * have been 'successful' in a certain sense, and the exit status is
 604  * always zero.  If the application use count is zero, though, the exit
 605  * status of the local #GApplicationCommandLine is used.
 606  *
 607  * Since: 2.28
 608  **/
 609 void
 610 g_application_command_line_set_exit_status (GApplicationCommandLine *cmdline,
 611                                             int                      exit_status)
 612 {
 613   g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
 614
 615   cmdline->priv->exit_status = exit_status;
 616 }
 617
 618 /**
 619  * g_application_command_line_get_exit_status:
 620  * @cmdline: a #GApplicationCommandLine
 621  *
 622  * Gets the exit status of @cmdline.  See
 623  * g_application_command_line_set_exit_status() for more information.
 624  *
 625  * Returns: the exit status
 626  *
 627  * Since: 2.28
 628  **/
 629 int
 630 g_application_command_line_get_exit_status (GApplicationCommandLine *cmdline)
 631 {
 632   g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), -1);
 633
 634   return cmdline->priv->exit_status;
 635 }
 636
 637 /**
 638  * g_application_command_line_get_platform_data:
 639  * @cmdline: #GApplicationCommandLine
 640  *
 641  * Gets the platform data associated with the invocation of @cmdline.
 642  *
 643  * This is a #GVariant dictionary containing information about the
 644  * context in which the invocation occurred.  It typically contains
 645  * information like the current working directory and the startup
 646  * notification ID.
 647  *
 648  * For local invocation, it will be %NULL.
 649  *
 650  * Returns: (allow-none): the platform data, or %NULL
 651  *
 652  * Since: 2.28
 653  **/
 654 GVariant *
 655 g_application_command_line_get_platform_data (GApplicationCommandLine *cmdline)
 656 {
 657   g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), NULL);
 658
 659   if (cmdline->priv->platform_data)
 660     return g_variant_ref (cmdline->priv->platform_data);
 661   else
 662       return NULL;
 663 }
 664
 665 /**
 666  * g_application_command_line_create_file_for_arg:
 667  * @cmdline: a #GApplicationCommandLine
 668  * @arg: an argument from @cmdline
 669  *
 670  * Creates a #GFile corresponding to a filename that was given as part
 671  * of the invocation of @cmdline.
 672  *
 673  * This differs from g_file_new_for_commandline_arg() in that it
 674  * resolves relative pathnames using the current working directory of
 675  * the invoking process rather than the local process.
 676  *
 677  * Returns: (transfer full): a new #GFile
 678  *
 679  * Since: 2.36
 680  **/
 681 GFile *
 682 g_application_command_line_create_file_for_arg (GApplicationCommandLine *cmdline,
 683                                                 const gchar             *arg)
 684 {
 685   g_return_val_if_fail (arg != NULL, NULL);
 686
 687   if (cmdline->priv->cwd)
 688     return g_file_new_for_commandline_arg_and_cwd (arg, cmdline->priv->cwd);
 689
 690   g_warning ("Requested creation of GFile for commandline invocation that did not send cwd. "
 691              "Using cwd of local process to resolve relative path names.");
 692
 693   return g_file_new_for_commandline_arg (arg);
 694 }