glib/gio/gapplicationcommandline.c

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/*
* Copyright © 2010 Codethink Limited
*
* This program 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 of the
* licence 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
* USA.
*
* Authors: Ryan Lortie <desrt@desrt.ca>
*/
#include "config.h"
#include "gapplicationcommandline.h"
#include "glibintl.h"
#include <string.h>
#include <stdio.h>
G_DEFINE_TYPE (GApplicationCommandLine, g_application_command_line, G_TYPE_OBJECT)
/**
* SECTION:gapplicationcommandline
* @title: GApplicationCommandLine
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* @short_description: A command-line invocation of an application
* @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).
*
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* 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
* <xref linkend="gapplication-example-cmdline3"/> for an example.
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*
* 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 <envar>EDITOR</envar> 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.
*
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* <example id="gapplication-example-cmdline"><title>Handling commandline arguments with GApplication</title>
* <para>
* A simple example where 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.
* </para>
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* <programlisting>
* <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-cmdline.c">
* <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
* </xi:include>
* </programlisting>
* </example>
*
* <example id="gapplication-example-cmdline2"><title>Split commandline handling</title>
* <para>
* An example of split commandline handling. Options that start with
* <literal>--local-</literal> are handled locally, all other options are
* passed to the #GApplication::command-line handler which runs in the primary
* instance.
* </para>
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* <programlisting>
* <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-cmdline2.c">
* <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
* </xi:include>
* </programlisting>
* </example>
*
* <example id="gapplication-example-cmdline3"><title>Deferred commandline handling</title>
* <para>
* An example of deferred commandline handling. Here, 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.
* </para>
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* <para>
* This example also shows how to use #GOptionContext for parsing the
* commandline arguments.
* </para>
* <programlisting>
* <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gapplication-example-cmdline3.c">
* <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
* </xi:include>
* </programlisting>
2010-10-23 20:43:36 +02:00
* </example>
**/
enum
{
PROP_NONE,
PROP_ARGUMENTS,
PROP_PLATFORM_DATA,
PROP_IS_REMOTE
};
struct _GApplicationCommandLinePrivate
{
GVariant *platform_data;
GVariant *arguments;
GVariant *cwd;
const gchar **environ;
gint exit_status;
};
/* 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_ref (value);
}
else if (strcmp (key, "environ") == 0)
{
if (!cmdline->priv->environ)
cmdline->priv->environ =
g_variant_get_bytestring_array (value, NULL);
}
}
static void
g_application_command_line_real_print_literal (GApplicationCommandLine *cmdline,
const gchar *message)
{
g_print ("%s\n", message);
}
static void
g_application_command_line_real_printerr_literal (GApplicationCommandLine *cmdline,
const gchar *message)
{
g_printerr ("%s\n", message);
}
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_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->platform_data)
g_variant_unref (cmdline->priv->platform_data);
if (cmdline->priv->arguments)
g_variant_unref (cmdline->priv->arguments);
if (cmdline->priv->cwd)
g_variant_unref (cmdline->priv->cwd);
G_OBJECT_CLASS (g_application_command_line_parent_class)
->finalize (object);
}
static void
g_application_command_line_init (GApplicationCommandLine *cmdline)
{
cmdline->priv =
G_TYPE_INSTANCE_GET_PRIVATE (cmdline,
G_TYPE_APPLICATION_COMMAND_LINE,
GApplicationCommandLinePrivate);
}
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;
class->printerr_literal = g_application_command_line_real_printerr_literal;
class->print_literal = g_application_command_line_real_print_literal;
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_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_type_class_add_private (class, sizeof (GApplicationCommandLinePrivate));
}
/**
* g_application_command_line_get_arguments:
* @cmdline: a #GApplicationCommandLine
* @argc: (out): 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-utf8 data.
*
* The return value is %NULL-terminated and should be freed using
* g_strfreev().
*
* Returns: (array length=argc) (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_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: the current directory, or %NULL
*
* Since: 2.28
**/
const gchar *
g_application_command_line_get_cwd (GApplicationCommandLine *cmdline)
{
if (cmdline->priv->cwd)
return g_variant_get_bytestring (cmdline->priv->cwd);
else
return NULL;
}
/**
* 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) (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 cmdline->priv->environ;
}
/**
* g_application_command_line_getenv:
* @cmdline: a #GApplicationCommandLine
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* @name: 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 occured. It typically contains
* information like the current working directory and the startup
* notification ID.
*
* For local invocation, it will be %NULL.
*
* Returns: 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;
}