/*
* Copyright © 2010 Codethink Limited
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Authors: Ryan Lortie <desrt@desrt.ca>
*/
#include "config.h"
#include "gapplicationcommandline.h"
#include "glibintl.h"
#include "gfile.h"
#include <string.h>
#include <stdio.h>
#ifdef G_OS_UNIX
#include "gunixinputstream.h"
#endif
#ifdef G_OS_WIN32
#include <windows.h>
#undef environ
#include "gwin32inputstream.h"
#endif
/**
* SECTION:gapplicationcommandline
* @title: GApplicationCommandLine
* @short_description: A command-line invocation of an application
* @include: gio/gio.h
* @see_also: #GApplication
*
* #GApplicationCommandLine represents a command-line invocation of
* an application. It is created by #GApplication and emitted
* in the #GApplication::command-line signal and virtual function.
*
* The class contains the list of arguments that the program was invoked
* with. It is also possible to query if the commandline invocation was
* local (ie: the current process is running in direct response to the
* invocation) or remote (ie: some other process forwarded the
* commandline to this process).
*
* The GApplicationCommandLine object can provide the @argc and @argv
* parameters for use with the #GOptionContext command-line parsing API,
* with the g_application_command_line_get_arguments() function. See
* [gapplication-example-cmdline3.c][gapplication-example-cmdline3]
* for an example.
*
* The exit status of the originally-invoked process may be set and
* messages can be printed to stdout or stderr of that process. The
* lifecycle of the originally-invoked process is tied to the lifecycle
* of this object (ie: the process exits when the last reference is
* dropped).
*
* The main use for #GApplicationCommandLine (and the
* #GApplication::command-line signal) is 'Emacs server' like use cases:
* You can set the `EDITOR` environment variable to have e.g. git use
* your favourite editor to edit commit messages, and if you already
* have an instance of the editor running, the editing will happen
* in the running instance, instead of opening a new one. An important
* aspect of this use case is that the process that gets started by git
* does not return until the editing is done.
*
* Normally, the commandline is completely handled in the
* #GApplication::command-line handler. The launching instance exits
* once the signal handler in the primary instance has returned, and
* the return value of the signal handler becomes the exit status
* of the launching instance.
* |[<!-- language="C" -->
* static int
* command_line (GApplication *application,
* GApplicationCommandLine *cmdline)
* {
* gchar **argv;
* gint argc;
* gint i;
*
* argv = g_application_command_line_get_arguments (cmdline, &argc);
*
* g_application_command_line_print (cmdline,
* "This text is written back\n"
* "to stdout of the caller\n");
*
* for (i = 0; i < argc; i++)
* g_print ("argument %d: %s\n", i, argv[i]);
*
* g_strfreev (argv);
*
* return 0;
* }
* ]|
* The complete example can be found here:
* [gapplication-example-cmdline.c](https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline.c)
*
* In more complicated cases, the handling of the comandline can be
* split between the launcher and the primary instance.
* |[<!-- language="C" -->
* static gboolean
* test_local_cmdline (GApplication *application,
* gchar ***arguments,
* gint *exit_status)
* {
* gint i, j;
* gchar **argv;
*
* argv = *arguments;
*
* i = 1;
* while (argv[i])
* {
* if (g_str_has_prefix (argv[i], "--local-"))
* {
* g_print ("handling argument %s locally\n", argv[i]);
* g_free (argv[i]);
* for (j = i; argv[j]; j++)
* argv[j] = argv[j + 1];
* }
* else
* {
* g_print ("not handling argument %s locally\n", argv[i]);
* i++;
* }
* }
*
* *exit_status = 0;
*
* return FALSE;
* }
*
* static void
* test_application_class_init (TestApplicationClass *class)
* {
* G_APPLICATION_CLASS (class)->local_command_line = test_local_cmdline;
*
* ...
* }
* ]|
* In this example of split commandline handling, options that start
* with `--local-` are handled locally, all other options are passed
* to the #GApplication::command-line handler which runs in the primary
* instance.
*
* The complete example can be found here:
* [gapplication-example-cmdline2.c](https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline2.c)
*
* If handling the commandline requires a lot of work, it may
* be better to defer it.
* |[<!-- language="C" -->
* static gboolean
* my_cmdline_handler (gpointer data)
* {
* GApplicationCommandLine *cmdline = data;
*
* // do the heavy lifting in an idle
*
* g_application_command_line_set_exit_status (cmdline, 0);
* g_object_unref (cmdline); // this releases the application
*
* return G_SOURCE_REMOVE;
* }
*
* static int
* command_line (GApplication *application,
* GApplicationCommandLine *cmdline)
* {
* // keep the application running until we are done with this commandline
* g_application_hold (application);
*
* g_object_set_data_full (G_OBJECT (cmdline),
* "application", application,
* (GDestroyNotify)g_application_release);
*
* g_object_ref (cmdline);
* g_idle_add (my_cmdline_handler, cmdline);
*
* return 0;
* }
* ]|
* In this example the commandline is not completely handled before
* the #GApplication::command-line handler returns. Instead, we keep
* a reference to the #GApplicationCommandLine object and handle it
* later (in this example, in an idle). Note that it is necessary to
* hold the application until you are done with the commandline.
*
* The complete example can be found here:
* [gapplication-example-cmdline3.c](https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline3.c)
*/
/**
* GApplicationCommandLine:
*
* #GApplicationCommandLine is an opaque data structure and can only be accessed
* using the following functions.
*/
/**
* GApplicationCommandLineClass:
*
* The #GApplicationCommandLineClass-struct
* contains private data only.
*
* Since: 2.28
**/
enum
{
PROP_NONE,
PROP_ARGUMENTS,
PROP_OPTIONS,
PROP_PLATFORM_DATA,
PROP_IS_REMOTE
};
struct _GApplicationCommandLinePrivate
{
GVariant *platform_data;
GVariant *arguments;
GVariant *options;
GVariantDict *options_dict;
gchar *cwd; /* in GLib filename encoding, not UTF-8 */
gchar **environ;
gint exit_status;
};
G_DEFINE_TYPE_WITH_PRIVATE (GApplicationCommandLine, g_application_command_line, G_TYPE_OBJECT)
/* All subclasses represent remote invocations of some kind. */
#define IS_REMOTE(cmdline) (G_TYPE_FROM_INSTANCE (cmdline) != \
G_TYPE_APPLICATION_COMMAND_LINE)
static void
grok_platform_data (GApplicationCommandLine *cmdline)
{
GVariantIter iter;
const gchar *key;
GVariant *value;
g_variant_iter_init (&iter, cmdline->priv->platform_data);
while (g_variant_iter_loop (&iter, "{&sv}", &key, &value))
if (strcmp (key, "cwd") == 0)
{
if (!cmdline->priv->cwd)
cmdline->priv->cwd = g_variant_dup_bytestring (value, NULL);
}
else if (strcmp (key, "environ") == 0)
{
if (!cmdline->priv->environ)
cmdline->priv->environ =
g_variant_dup_bytestring_array (value, NULL);
}
else if (strcmp (key, "options") == 0)
{
if (!cmdline->priv->options)
cmdline->priv->options = g_variant_ref (value);
}
}
static void
g_application_command_line_real_print_literal (GApplicationCommandLine *cmdline,
const gchar *message)
{
g_print ("%s", message);
}
static void
g_application_command_line_real_printerr_literal (GApplicationCommandLine *cmdline,
const gchar *message)
{
g_printerr ("%s", message);
}
static GInputStream *
g_application_command_line_real_get_stdin (GApplicationCommandLine *cmdline)
{
#ifdef G_OS_UNIX
return g_unix_input_stream_new (0, FALSE);
#else
return g_win32_input_stream_new (GetStdHandle (STD_INPUT_HANDLE), FALSE);
#endif
}
static void
g_application_command_line_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
switch (prop_id)
{
case PROP_ARGUMENTS:
g_value_set_variant (value, cmdline->priv->arguments);
break;
case PROP_PLATFORM_DATA:
g_value_set_variant (value, cmdline->priv->platform_data);
break;
case PROP_IS_REMOTE:
g_value_set_boolean (value, IS_REMOTE (cmdline));
break;
default:
g_assert_not_reached ();
}
}
static void
g_application_command_line_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
switch (prop_id)
{
case PROP_ARGUMENTS:
g_assert (cmdline->priv->arguments == NULL);
cmdline->priv->arguments = g_value_dup_variant (value);
break;
case PROP_OPTIONS:
g_assert (cmdline->priv->options == NULL);
cmdline->priv->options = g_value_dup_variant (value);
break;
case PROP_PLATFORM_DATA:
g_assert (cmdline->priv->platform_data == NULL);
cmdline->priv->platform_data = g_value_dup_variant (value);
if (cmdline->priv->platform_data != NULL)
grok_platform_data (cmdline);
break;
default:
g_assert_not_reached ();
}
}
static void
g_application_command_line_finalize (GObject *object)
{
GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
if (cmdline->priv->options_dict)
g_variant_dict_unref (cmdline->priv->options_dict);
if (cmdline->priv->options)
g_variant_unref (cmdline->priv->options);
if (cmdline->priv->platform_data)
g_variant_unref (cmdline->priv->platform_data);
if (cmdline->priv->arguments)
g_variant_unref (cmdline->priv->arguments);
g_free (cmdline->priv->cwd);
g_strfreev (cmdline->priv->environ);
G_OBJECT_CLASS (g_application_command_line_parent_class)
->finalize (object);
}
static void
g_application_command_line_init (GApplicationCommandLine *cmdline)
{
cmdline->priv = g_application_command_line_get_instance_private (cmdline);
}
static void
g_application_command_line_constructed (GObject *object)
{
GApplicationCommandLine *cmdline = G_APPLICATION_COMMAND_LINE (object);
if (IS_REMOTE (cmdline))
return;
/* In the local case, set cmd and environ */
if (!cmdline->priv->cwd)
cmdline->priv->cwd = g_get_current_dir ();
if (!cmdline->priv->environ)
cmdline->priv->environ = g_get_environ ();
}
static void
g_application_command_line_class_init (GApplicationCommandLineClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->get_property = g_application_command_line_get_property;
object_class->set_property = g_application_command_line_set_property;
object_class->finalize = g_application_command_line_finalize;
object_class->constructed = g_application_command_line_constructed;
class->printerr_literal = g_application_command_line_real_printerr_literal;
class->print_literal = g_application_command_line_real_print_literal;
class->get_stdin = g_application_command_line_real_get_stdin;
g_object_class_install_property (object_class, PROP_ARGUMENTS,
g_param_spec_variant ("arguments",
P_("Commandline arguments"),
P_("The commandline that caused this ::command-line signal emission"),
G_VARIANT_TYPE_BYTESTRING_ARRAY, NULL,
G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_OPTIONS,
g_param_spec_variant ("options",
P_("Options"),
P_("The options sent along with the commandline"),
G_VARIANT_TYPE_VARDICT, NULL, G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_PLATFORM_DATA,
g_param_spec_variant ("platform-data",
P_("Platform data"),
P_("Platform-specific data for the commandline"),
G_VARIANT_TYPE ("a{sv}"), NULL,
G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (object_class, PROP_IS_REMOTE,
g_param_spec_boolean ("is-remote",
P_("Is remote"),
P_("TRUE if this is a remote commandline"),
FALSE,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
}
/**
* g_application_command_line_get_arguments:
* @cmdline: a #GApplicationCommandLine
* @argc: (out) (optional): the length of the arguments array, or %NULL
*
* Gets the list of arguments that was passed on the command line.
*
* The strings in the array may contain non-UTF-8 data on UNIX (such as
* filenames or arguments given in the system locale) but are always in
* UTF-8 on Windows.
*
* If you wish to use the return value with #GOptionContext, you must
* use g_option_context_parse_strv().
*
* The return value is %NULL-terminated and should be freed using
* g_strfreev().
*
* Returns: (array length=argc) (element-type filename) (transfer full)
* the string array containing the arguments (the argv)
*
* Since: 2.28
**/
gchar **
g_application_command_line_get_arguments (GApplicationCommandLine *cmdline,
int *argc)
{
gchar **argv;
gsize len;
g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), NULL);
argv = g_variant_dup_bytestring_array (cmdline->priv->arguments, &len);
if (argc)
*argc = len;
return argv;
}
/**
* g_application_command_line_get_options_dict:
* @cmdline: a #GApplicationCommandLine
*
* Gets the options there were passed to g_application_command_line().
*
* If you did not override local_command_line() then these are the same
* options that were parsed according to the #GOptionEntrys added to the
* application with g_application_add_main_option_entries() and possibly
* modified from your GApplication::handle-local-options handler.
*
* If no options were sent then an empty dictionary is returned so that
* you don't need to check for %NULL.
*
* Returns: (transfer none): a #GVariantDict with the options
*
* Since: 2.40
**/
GVariantDict *
g_application_command_line_get_options_dict (GApplicationCommandLine *cmdline)
{
g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), NULL);
if (!cmdline->priv->options_dict)
cmdline->priv->options_dict = g_variant_dict_new (cmdline->priv->options);
return cmdline->priv->options_dict;
}
/**
* g_application_command_line_get_stdin:
* @cmdline: a #GApplicationCommandLine
*
* Gets the stdin of the invoking process.
*
* The #GInputStream can be used to read data passed to the standard
* input of the invoking process.
* This doesn't work on all platforms. Presently, it is only available
* on UNIX when using a DBus daemon capable of passing file descriptors.
* If stdin is not available then %NULL will be returned. In the
* future, support may be expanded to other platforms.
*
* You must only call this function once per commandline invocation.
*
* Returns: (transfer full): a #GInputStream for stdin
*
* Since: 2.34
**/
GInputStream *
g_application_command_line_get_stdin (GApplicationCommandLine *cmdline)
{
return G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)->get_stdin (cmdline);
}
/**
* g_application_command_line_get_cwd:
* @cmdline: a #GApplicationCommandLine
*
* Gets the working directory of the command line invocation.
* The string may contain non-utf8 data.
*
* It is possible that the remote application did not send a working
* directory, so this may be %NULL.
*
* The return value should not be modified or freed and is valid for as
* long as @cmdline exists.
*
* Returns: (nullable) (type filename): the current directory, or %NULL
*
* Since: 2.28
**/
const gchar *
g_application_command_line_get_cwd (GApplicationCommandLine *cmdline)
{
return cmdline->priv->cwd;
}
/**
* g_application_command_line_get_environ:
* @cmdline: a #GApplicationCommandLine
*
* Gets the contents of the 'environ' variable of the command line
* invocation, as would be returned by g_get_environ(), ie as a
* %NULL-terminated list of strings in the form 'NAME=VALUE'.
* The strings may contain non-utf8 data.
*
* The remote application usually does not send an environment. Use
* %G_APPLICATION_SEND_ENVIRONMENT to affect that. Even with this flag
* set it is possible that the environment is still not available (due
* to invocation messages from other applications).
*
* The return value should not be modified or freed and is valid for as
* long as @cmdline exists.
*
* See g_application_command_line_getenv() if you are only interested
* in the value of a single environment variable.
*
* Returns: (array zero-terminated=1) (element-type filename) (transfer none):
* the environment strings, or %NULL if they were not sent
*
* Since: 2.28
**/
const gchar * const *
g_application_command_line_get_environ (GApplicationCommandLine *cmdline)
{
return (const gchar **)cmdline->priv->environ;
}
/**
* g_application_command_line_getenv:
* @cmdline: a #GApplicationCommandLine
* @name: (type filename): the environment variable to get
*
* Gets the value of a particular environment variable of the command
* line invocation, as would be returned by g_getenv(). The strings may
* contain non-utf8 data.
*
* The remote application usually does not send an environment. Use
* %G_APPLICATION_SEND_ENVIRONMENT to affect that. Even with this flag
* set it is possible that the environment is still not available (due
* to invocation messages from other applications).
*
* The return value should not be modified or freed and is valid for as
* long as @cmdline exists.
*
* Returns: the value of the variable, or %NULL if unset or unsent
*
* Since: 2.28
**/
const gchar *
g_application_command_line_getenv (GApplicationCommandLine *cmdline,
const gchar *name)
{
gint length = strlen (name);
gint i;
/* TODO: expand on windows */
if (cmdline->priv->environ)
for (i = 0; cmdline->priv->environ[i]; i++)
if (strncmp (cmdline->priv->environ[i], name, length) == 0 &&
cmdline->priv->environ[i][length] == '=')
return cmdline->priv->environ[i] + length + 1;
return NULL;
}
/**
* g_application_command_line_get_is_remote:
* @cmdline: a #GApplicationCommandLine
*
* Determines if @cmdline represents a remote invocation.
*
* Returns: %TRUE if the invocation was remote
*
* Since: 2.28
**/
gboolean
g_application_command_line_get_is_remote (GApplicationCommandLine *cmdline)
{
return IS_REMOTE (cmdline);
}
/**
* g_application_command_line_print:
* @cmdline: a #GApplicationCommandLine
* @format: a printf-style format string
* @...: arguments, as per @format
*
* Formats a message and prints it using the stdout print handler in the
* invoking process.
*
* If @cmdline is a local invocation then this is exactly equivalent to
* g_print(). If @cmdline is remote then this is equivalent to calling
* g_print() in the invoking process.
*
* Since: 2.28
**/
void
g_application_command_line_print (GApplicationCommandLine *cmdline,
const gchar *format,
...)
{
gchar *message;
va_list ap;
g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
g_return_if_fail (format != NULL);
va_start (ap, format);
message = g_strdup_vprintf (format, ap);
va_end (ap);
G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)
->print_literal (cmdline, message);
g_free (message);
}
/**
* g_application_command_line_printerr:
* @cmdline: a #GApplicationCommandLine
* @format: a printf-style format string
* @...: arguments, as per @format
*
* Formats a message and prints it using the stderr print handler in the
* invoking process.
*
* If @cmdline is a local invocation then this is exactly equivalent to
* g_printerr(). If @cmdline is remote then this is equivalent to
* calling g_printerr() in the invoking process.
*
* Since: 2.28
**/
void
g_application_command_line_printerr (GApplicationCommandLine *cmdline,
const gchar *format,
...)
{
gchar *message;
va_list ap;
g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
g_return_if_fail (format != NULL);
va_start (ap, format);
message = g_strdup_vprintf (format, ap);
va_end (ap);
G_APPLICATION_COMMAND_LINE_GET_CLASS (cmdline)
->printerr_literal (cmdline, message);
g_free (message);
}
/**
* g_application_command_line_set_exit_status:
* @cmdline: a #GApplicationCommandLine
* @exit_status: the exit status
*
* Sets the exit status that will be used when the invoking process
* exits.
*
* The return value of the #GApplication::command-line signal is
* passed to this function when the handler returns. This is the usual
* way of setting the exit status.
*
* In the event that you want the remote invocation to continue running
* and want to decide on the exit status in the future, you can use this
* call. For the case of a remote invocation, the remote process will
* typically exit when the last reference is dropped on @cmdline. The
* exit status of the remote process will be equal to the last value
* that was set with this function.
*
* In the case that the commandline invocation is local, the situation
* is slightly more complicated. If the commandline invocation results
* in the mainloop running (ie: because the use-count of the application
* increased to a non-zero value) then the application is considered to
* have been 'successful' in a certain sense, and the exit status is
* always zero. If the application use count is zero, though, the exit
* status of the local #GApplicationCommandLine is used.
*
* Since: 2.28
**/
void
g_application_command_line_set_exit_status (GApplicationCommandLine *cmdline,
int exit_status)
{
g_return_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline));
cmdline->priv->exit_status = exit_status;
}
/**
* g_application_command_line_get_exit_status:
* @cmdline: a #GApplicationCommandLine
*
* Gets the exit status of @cmdline. See
* g_application_command_line_set_exit_status() for more information.
*
* Returns: the exit status
*
* Since: 2.28
**/
int
g_application_command_line_get_exit_status (GApplicationCommandLine *cmdline)
{
g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), -1);
return cmdline->priv->exit_status;
}
/**
* g_application_command_line_get_platform_data:
* @cmdline: #GApplicationCommandLine
*
* Gets the platform data associated with the invocation of @cmdline.
*
* This is a #GVariant dictionary containing information about the
* context in which the invocation occurred. It typically contains
* information like the current working directory and the startup
* notification ID.
*
* For local invocation, it will be %NULL.
*
* Returns: (nullable): the platform data, or %NULL
*
* Since: 2.28
**/
GVariant *
g_application_command_line_get_platform_data (GApplicationCommandLine *cmdline)
{
g_return_val_if_fail (G_IS_APPLICATION_COMMAND_LINE (cmdline), NULL);
if (cmdline->priv->platform_data)
return g_variant_ref (cmdline->priv->platform_data);
else
return NULL;
}
/**
* g_application_command_line_create_file_for_arg:
* @cmdline: a #GApplicationCommandLine
* @arg: (type filename): an argument from @cmdline
*
* Creates a #GFile corresponding to a filename that was given as part
* of the invocation of @cmdline.
*
* This differs from g_file_new_for_commandline_arg() in that it
* resolves relative pathnames using the current working directory of
* the invoking process rather than the local process.
*
* Returns: (transfer full): a new #GFile
*
* Since: 2.36
**/
GFile *
g_application_command_line_create_file_for_arg (GApplicationCommandLine *cmdline,
const gchar *arg)
{
g_return_val_if_fail (arg != NULL, NULL);
if (cmdline->priv->cwd)
return g_file_new_for_commandline_arg_and_cwd (arg, cmdline->priv->cwd);
g_warning ("Requested creation of GFile for commandline invocation that did not send cwd. "
"Using cwd of local process to resolve relative path names.");
return g_file_new_for_commandline_arg (arg);
}