GApplicationCommandline: Shorten embedded examples

Just show relevant fragments of the three examples inline,
and link to the full sources. This lets us get rid of
xinclude markup.
This commit is contained in:
Matthias Clasen 2014-02-01 15:11:00 -05:00
parent 77c4ff80dc
commit 701f00f125

View File

@ -74,58 +74,127 @@
* aspect of this use case is that the process that gets started by git
* does not return until the editing is done.
*
* <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>
* <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>
* 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;
*
* <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>
* <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>
* argv = g_application_command_line_get_arguments (cmdline, &argc);
*
* <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>
* <para>
* This example also shows how to use #GOptionContext for parsing the
* commandline arguments. Note that it is necessary to disable the
* built-in help-handling of #GOptionContext, since it calls exit()
* after printing help, which is not what you want to happen in
* the primary instance.
* </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>
* </example>
**/
* 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: <ulink url="https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline.c">gapplication-example-cmdline.c</ulink>
*
* 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 <literal>--local-</literal> 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: <ulink url="https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline2.c">gapplication-example-cmdline2.c</ulink>
*
* 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;
*
* /&ast; do the heavy lifting in an idle &ast;/
*
* g_application_command_line_set_exit_status (cmdline, 0);
* g_object_unref (cmdline); /&ast; this releases the application &ast;/
*
* return G_SOURCE_REMOVE;
* }
*
* static int
* command_line (GApplication *application,
* GApplicationCommandLine *cmdline)
* {
* /&ast; keep the application running until we are done with this commandline &ast;/
* 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: <ulink url="https://git.gnome.org/browse/glib/tree/gio/tests/gapplication-example-cmdline3.c">gapplication-example-cmdline3.c</ulink>
*/
/**
* GApplicationCommandLineClass: