2 * Copyright © 2010 Codethink Limited
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.
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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 * Authors: Ryan Lortie <desrt@desrt.ca>
22 #include "gapplicationcommandline.h"
31 #include "gunixinputstream.h"
37 #include "gwin32inputstream.h"
41 * SECTION:gapplicationcommandline
42 * @title: GApplicationCommandLine
43 * @short_description: A command-line invocation of an application
45 * @see_also: #GApplication
47 * #GApplicationCommandLine represents a command-line invocation of
48 * an application. It is created by #GApplication and emitted
49 * in the #GApplication::command-line signal and virtual function.
51 * The class contains the list of arguments that the program was invoked
52 * with. It is also possible to query if the commandline invocation was
53 * local (ie: the current process is running in direct response to the
54 * invocation) or remote (ie: some other process forwarded the
55 * commandline to this process).
57 * The GApplicationCommandLine object can provide the @argc and @argv
58 * parameters for use with the #GOptionContext command-line parsing API,
59 * with the g_application_command_line_get_arguments() function. See
60 * <xref linkend="gapplication-example-cmdline3"/> for an example.
62 * The exit status of the originally-invoked process may be set and
63 * messages can be printed to stdout or stderr of that process. The
64 * lifecycle of the originally-invoked process is tied to the lifecycle
65 * of this object (ie: the process exits when the last reference is
68 * The main use for #GApplicationCommandLine (and the
69 * #GApplication::command-line signal) is 'Emacs server' like use cases:
70 * You can set the `EDITOR` environment variable to have e.g. git use
71 * your favourite editor to edit commit messages, and if you already
72 * have an instance of the editor running, the editing will happen
73 * in the running instance, instead of opening a new one. An important
74 * aspect of this use case is that the process that gets started by git
75 * does not return until the editing is done.
77 * Normally, the commandline is completely handled in the
78 * #GApplication::command-line handler. The launching instance exits
79 * once the signal handler in the primary instance has returned, and
80 * the return value of the signal handler becomes the exit status
81 * of the launching instance.
82 * |[<!-- language="C" -->
84 * command_line (GApplication *application,
85 * GApplicationCommandLine *cmdline)
91 * argv = g_application_command_line_get_arguments (cmdline, &argc);
93 * g_application_command_line_print (cmdline,
94 * "This text is written back\n"
95 * "to stdout of the caller\n");
97 * for (i = 0; i < argc; i++)
98 * g_print ("argument %d: %s\n", i, argv[i]);
105 * The complete example can be found here: <ulink url="https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline.c">gapplication-example-cmdline.c</ulink>
107 * In more complicated cases, the handling of the comandline can be
108 * split between the launcher and the primary instance.
109 * |[<!-- language="C" -->
111 * test_local_cmdline (GApplication *application,
112 * gchar ***arguments,
123 * if (g_str_has_prefix (argv[i], "--local-"))
125 * g_print ("handling argument %s locally\n", argv[i]);
127 * for (j = i; argv[j]; j++)
128 * argv[j] = argv[j + 1];
132 * g_print ("not handling argument %s locally\n", argv[i]);
143 * test_application_class_init (TestApplicationClass *class)
145 * G_APPLICATION_CLASS (class)->local_command_line = test_local_cmdline;
150 * In this example of split commandline handling, options that start
151 * with <literal>--local-</literal> are handled locally, all other
152 * options are passed to the #GApplication::command-line handler
153 * which runs in the primary instance.
155 * The complete example can be found here: <ulink url="https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline2.c">gapplication-example-cmdline2.c</ulink>
157 * If handling the commandline requires a lot of work, it may
158 * be better to defer it.
159 * |[<!-- language="C" -->
161 * my_cmdline_handler (gpointer data)
163 * GApplicationCommandLine *cmdline = data;
165 * /* do the heavy lifting in an idle */
167 * g_application_command_line_set_exit_status (cmdline, 0);
168 * g_object_unref (cmdline); /* this releases the application */
170 * return G_SOURCE_REMOVE;
174 * command_line (GApplication *application,
175 * GApplicationCommandLine *cmdline)
177 * /* keep the application running until we are done with this commandline */
178 * g_application_hold (application);
180 * g_object_set_data_full (G_OBJECT (cmdline),
181 * "application", application,
182 * (GDestroyNotify)g_application_release);
184 * g_object_ref (cmdline);
185 * g_idle_add (my_cmdline_handler, cmdline);
190 * In this example the commandline is not completely handled before
191 * the #GApplication::command-line handler returns. Instead, we keep
192 * a reference to the #GApplicationCommandLine object and handle it
193 * later (in this example, in an idle). Note that it is necessary to
194 * hold the application until you are done with the commandline.
196 * The complete example can be found here: <ulink url="https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline3.c">gapplication-example-cmdline3.c</ulink>
200 * GApplicationCommandLineClass:
202 * The #GApplicationCommandLineClass-struct
203 * contains private data only.
215 struct _GApplicationCommandLinePrivate
217 GVariant *platform_data;
225 G_DEFINE_TYPE_WITH_PRIVATE (GApplicationCommandLine, g_application_command_line, G_TYPE_OBJECT)
227 /* All subclasses represent remote invocations of some kind. */
228 #define IS_REMOTE(cmdline) (G_TYPE_FROM_INSTANCE (cmdline) != \
229 G_TYPE_APPLICATION_COMMAND_LINE)
232 grok_platform_data (GApplicationCommandLine *cmdline)
238 g_variant_iter_init (&iter, cmdline->priv->platform_data);
240 while (g_variant_iter_loop (&iter, "{&sv}", &key, &value))
241 if (strcmp (key, "cwd") == 0)
243 if (!cmdline->priv->cwd)
244 cmdline->priv->cwd = g_variant_dup_bytestring (value, NULL);
247 else if (strcmp (key, "environ") == 0)
249 if (!cmdline->priv->environ)
250 cmdline->priv->environ =
251 g_variant_dup_bytestring_array (value, NULL);
256 g_application_command_line_real_print_literal (GApplicationCommandLine *cmdline,
257 const gchar *message)
259 g_print ("%s", message);
263 g_application_command_line_real_printerr_literal (GApplicationCommandLine *cmdline,
264 const gchar *message)
266 g_printerr ("%s", message);
269 static GInputStream *
270 g_application_command_line_real_get_stdin (GApplicationCommandLine *cmdline)
273 return g_unix_input_stream_new (0, FALSE);
275 return g_win32_input_stream_new (GetStdHandle (STD_INPUT_HANDLE), FALSE);
280 g_application_command_line_get_property (GObject *object,
285 GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
290 g_value_set_variant (value, cmdline->priv->arguments);
293 case PROP_PLATFORM_DATA:
294 g_value_set_variant (value, cmdline->priv->platform_data);
298 g_value_set_boolean (value, IS_REMOTE (cmdline));
302 g_assert_not_reached ();
307 g_application_command_line_set_property (GObject *object,
312 GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
317 g_assert (cmdline->priv->arguments == NULL);
318 cmdline->priv->arguments = g_value_dup_variant (value);
321 case PROP_PLATFORM_DATA:
322 g_assert (cmdline->priv->platform_data == NULL);
323 cmdline->priv->platform_data = g_value_dup_variant (value);
324 if (cmdline->priv->platform_data != NULL)
325 grok_platform_data (cmdline);
329 g_assert_not_reached ();
334 g_application_command_line_finalize (GObject *object)
336 GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
338 if (cmdline->priv->platform_data)
339 g_variant_unref (cmdline->priv->platform_data);
340 if (cmdline->priv->arguments)
341 g_variant_unref (cmdline->priv->arguments);
343 g_free (cmdline->priv->cwd);
344 g_strfreev (cmdline->priv->environ);
346 G_OBJECT_CLASS (g_application_command_line_parent_class)
351 g_application_command_line_init (GApplicationCommandLine *cmdline)
353 cmdline->priv = g_application_command_line_get_instance_private (cmdline);
357 g_application_command_line_constructed (GObject *object)
359 GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
361 if (IS_REMOTE (cmdline))
364 /* In the local case, set cmd and environ */
365 if (!cmdline->priv->cwd)
366 cmdline->priv->cwd = g_get_current_dir ();
368 if (!cmdline->priv->environ)
369 cmdline->priv->environ = g_get_environ ();
373 g_application_command_line_class_init (GApplicationCommandLineClass *class)
375 GObjectClass *object_class = G_OBJECT_CLASS (class);
377 object_class->get_property = g_application_command_line_get_property;
378 object_class->set_property = g_application_command_line_set_property;
379 object_class->finalize = g_application_command_line_finalize;
380 object_class->constructed = g_application_command_line_constructed;
382 class->printerr_literal = g_application_command_line_real_printerr_literal;
383 class->print_literal = g_application_command_line_real_print_literal;
384 class->get_stdin = g_application_command_line_real_get_stdin;
386 g_object_class_install_property (object_class, PROP_ARGUMENTS,
387 g_param_spec_variant ("arguments",
388 P_("Commandline arguments"),
389 P_("The commandline that caused this ::command-line signal emission"),
390 G_VARIANT_TYPE_BYTESTRING_ARRAY, NULL,
391 G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
392 G_PARAM_STATIC_STRINGS));
394 g_object_class_install_property (object_class, PROP_PLATFORM_DATA,
395 g_param_spec_variant ("platform-data",
397 P_("Platform-specific data for the commandline"),
398 G_VARIANT_TYPE ("a{sv}"), NULL,
399 G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
400 G_PARAM_STATIC_STRINGS));
402 g_object_class_install_property (object_class, PROP_IS_REMOTE,
403 g_param_spec_boolean ("is-remote",
405 P_("TRUE if this is a remote commandline"),
407 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
412 * g_application_command_line_get_arguments:
413 * @cmdline: a #GApplicationCommandLine
414 * @argc: (out) (allow-none): the length of the arguments array, or %NULL
416 * Gets the list of arguments that was passed on the command line.
418 * The strings in the array may contain non-UTF-8 data on UNIX (such as
419 * filenames or arguments given in the system locale) but are always in
422 * If you wish to use the return value with #GOptionContext, you must
423 * use g_option_context_parse_strv().
425 * The return value is %NULL-terminated and should be freed using
428 * Returns: (array length=argc) (transfer full): the string array
429 * containing the arguments (the argv)
434 g_application_command_line_get_arguments (GApplicationCommandLine *cmdline,
440 g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), NULL);
442 argv = g_variant_dup_bytestring_array (cmdline->priv->arguments, &len);
451 * g_application_command_line_get_stdin:
452 * @cmdline: a #GApplicationCommandLine
454 * Gets the stdin of the invoking process.
456 * The #GInputStream can be used to read data passed to the standard
457 * input of the invoking process.
458 * This doesn't work on all platforms. Presently, it is only available
459 * on UNIX when using a DBus daemon capable of passing file descriptors.
460 * If stdin is not available then %NULL will be returned. In the
461 * future, support may be expanded to other platforms.
463 * You must only call this function once per commandline invocation.
465 * Returns: (transfer full): a #GInputStream for stdin
470 g_application_command_line_get_stdin (GApplicationCommandLine *cmdline)
472 return G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)->get_stdin (cmdline);
476 * g_application_command_line_get_cwd:
477 * @cmdline: a #GApplicationCommandLine
479 * Gets the working directory of the command line invocation.
480 * The string may contain non-utf8 data.
482 * It is possible that the remote application did not send a working
483 * directory, so this may be %NULL.
485 * The return value should not be modified or freed and is valid for as
486 * long as @cmdline exists.
488 * Returns: the current directory, or %NULL
493 g_application_command_line_get_cwd (GApplicationCommandLine *cmdline)
495 return cmdline->priv->cwd;
499 * g_application_command_line_get_environ:
500 * @cmdline: a #GApplicationCommandLine
502 * Gets the contents of the 'environ' variable of the command line
503 * invocation, as would be returned by g_get_environ(), ie as a
504 * %NULL-terminated list of strings in the form 'NAME=VALUE'.
505 * The strings may contain non-utf8 data.
507 * The remote application usually does not send an environment. Use
508 * %G_APPLICATION_SEND_ENVIRONMENT to affect that. Even with this flag
509 * set it is possible that the environment is still not available (due
510 * to invocation messages from other applications).
512 * The return value should not be modified or freed and is valid for as
513 * long as @cmdline exists.
515 * See g_application_command_line_getenv() if you are only interested
516 * in the value of a single environment variable.
518 * Returns: (array zero-terminated=1) (transfer none): the environment
519 * strings, or %NULL if they were not sent
523 const gchar * const *
524 g_application_command_line_get_environ (GApplicationCommandLine *cmdline)
526 return (const gchar **)cmdline->priv->environ;
530 * g_application_command_line_getenv:
531 * @cmdline: a #GApplicationCommandLine
532 * @name: the environment variable to get
534 * Gets the value of a particular environment variable of the command
535 * line invocation, as would be returned by g_getenv(). The strings may
536 * contain non-utf8 data.
538 * The remote application usually does not send an environment. Use
539 * %G_APPLICATION_SEND_ENVIRONMENT to affect that. Even with this flag
540 * set it is possible that the environment is still not available (due
541 * to invocation messages from other applications).
543 * The return value should not be modified or freed and is valid for as
544 * long as @cmdline exists.
546 * Returns: the value of the variable, or %NULL if unset or unsent
551 g_application_command_line_getenv (GApplicationCommandLine *cmdline,
554 gint length = strlen (name);
557 /* TODO: expand on windows */
558 if (cmdline->priv->environ)
559 for (i = 0; cmdline->priv->environ[i]; i++)
560 if (strncmp (cmdline->priv->environ[i], name, length) == 0 &&
561 cmdline->priv->environ[i][length] == '=')
562 return cmdline->priv->environ[i] + length + 1;
568 * g_application_command_line_get_is_remote:
569 * @cmdline: a #GApplicationCommandLine
571 * Determines if @cmdline represents a remote invocation.
573 * Returns: %TRUE if the invocation was remote
578 g_application_command_line_get_is_remote (GApplicationCommandLine *cmdline)
580 return IS_REMOTE (cmdline);
584 * g_application_command_line_print:
585 * @cmdline: a #GApplicationCommandLine
586 * @format: a printf-style format string
587 * @...: arguments, as per @format
589 * Formats a message and prints it using the stdout print handler in the
592 * If @cmdline is a local invocation then this is exactly equivalent to
593 * g_print(). If @cmdline is remote then this is equivalent to calling
594 * g_print() in the invoking process.
599 g_application_command_line_print (GApplicationCommandLine *cmdline,
606 g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
607 g_return_if_fail (format != NULL);
609 va_start (ap, format);
610 message = g_strdup_vprintf (format, ap);
613 G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)
614 ->print_literal (cmdline, message);
619 * g_application_command_line_printerr:
620 * @cmdline: a #GApplicationCommandLine
621 * @format: a printf-style format string
622 * @...: arguments, as per @format
624 * Formats a message and prints it using the stderr print handler in the
627 * If @cmdline is a local invocation then this is exactly equivalent to
628 * g_printerr(). If @cmdline is remote then this is equivalent to
629 * calling g_printerr() in the invoking process.
634 g_application_command_line_printerr (GApplicationCommandLine *cmdline,
641 g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
642 g_return_if_fail (format != NULL);
644 va_start (ap, format);
645 message = g_strdup_vprintf (format, ap);
648 G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)
649 ->printerr_literal (cmdline, message);
654 * g_application_command_line_set_exit_status:
655 * @cmdline: a #GApplicationCommandLine
656 * @exit_status: the exit status
658 * Sets the exit status that will be used when the invoking process
661 * The return value of the #GApplication::command-line signal is
662 * passed to this function when the handler returns. This is the usual
663 * way of setting the exit status.
665 * In the event that you want the remote invocation to continue running
666 * and want to decide on the exit status in the future, you can use this
667 * call. For the case of a remote invocation, the remote process will
668 * typically exit when the last reference is dropped on @cmdline. The
669 * exit status of the remote process will be equal to the last value
670 * that was set with this function.
672 * In the case that the commandline invocation is local, the situation
673 * is slightly more complicated. If the commandline invocation results
674 * in the mainloop running (ie: because the use-count of the application
675 * increased to a non-zero value) then the application is considered to
676 * have been 'successful' in a certain sense, and the exit status is
677 * always zero. If the application use count is zero, though, the exit
678 * status of the local #GApplicationCommandLine is used.
683 g_application_command_line_set_exit_status (GApplicationCommandLine *cmdline,
686 g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
688 cmdline->priv->exit_status = exit_status;
692 * g_application_command_line_get_exit_status:
693 * @cmdline: a #GApplicationCommandLine
695 * Gets the exit status of @cmdline. See
696 * g_application_command_line_set_exit_status() for more information.
698 * Returns: the exit status
703 g_application_command_line_get_exit_status (GApplicationCommandLine *cmdline)
705 g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), -1);
707 return cmdline->priv->exit_status;
711 * g_application_command_line_get_platform_data:
712 * @cmdline: #GApplicationCommandLine
714 * Gets the platform data associated with the invocation of @cmdline.
716 * This is a #GVariant dictionary containing information about the
717 * context in which the invocation occurred. It typically contains
718 * information like the current working directory and the startup
721 * For local invocation, it will be %NULL.
723 * Returns: (allow-none): the platform data, or %NULL
728 g_application_command_line_get_platform_data (GApplicationCommandLine *cmdline)
730 g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), NULL);
732 if (cmdline->priv->platform_data)
733 return g_variant_ref (cmdline->priv->platform_data);
739 * g_application_command_line_create_file_for_arg:
740 * @cmdline: a #GApplicationCommandLine
741 * @arg: an argument from @cmdline
743 * Creates a #GFile corresponding to a filename that was given as part
744 * of the invocation of @cmdline.
746 * This differs from g_file_new_for_commandline_arg() in that it
747 * resolves relative pathnames using the current working directory of
748 * the invoking process rather than the local process.
750 * Returns: (transfer full): a new #GFile
755 g_application_command_line_create_file_for_arg (GApplicationCommandLine *cmdline,
758 g_return_val_if_fail (arg != NULL, NULL);
760 if (cmdline->priv->cwd)
761 return g_file_new_for_commandline_arg_and_cwd (arg, cmdline->priv->cwd);
763 g_warning ("Requested creation of GFile for commandline invocation that did not send cwd. "
764 "Using cwd of local process to resolve relative path names.");
766 return g_file_new_for_commandline_arg (arg);