[gtk+] gtk-launch: Add --version

[Matthias Clasen <matthiasc src gnome org>]

commit bc882a679d7e51baf1e61d31cfa75202e5a70e9b
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 31 12:05:35 2016 -0500

    gtk-launch: Add --version
    
    Support --version. Also improve the --help output cosmetically.

 docs/reference/gtk/gtk-launch.xml |    9 ++++++++-
 gtk/gtk-launch.c                  |   29 +++++++++++++++++++----------
 2 files changed, 27 insertions(+), 11 deletions(-)
---
diff --git a/docs/reference/gtk/gtk-launch.xml b/docs/reference/gtk/gtk-launch.xml
index 1b2ba7b..86ffe6d 100644
--- a/docs/reference/gtk/gtk-launch.xml
+++ b/docs/reference/gtk/gtk-launch.xml
@@ -31,7 +31,8 @@
 <refsynopsisdiv>
 <cmdsynopsis>
 <command>gtk-launch</command>
-<arg>APPLICATION</arg>
+<arg choice="opt" rep="repeat">OPTION</arg>
+<arg choice="plain">APPLICATION</arg>
 <arg choice="opt" rep="repeat">URI</arg>
 </cmdsynopsis>
 </refsynopsisdiv>
@@ -62,6 +63,12 @@ application.
       <listitem><para>Prints a short help text and exits.</para></listitem>
     </varlistentry>
   </variablelist>
+  <variablelist>
+    <varlistentry>
+    <term><option>--version</option></term>
+      <listitem><para>Prints the program version and exits.</para></listitem>
+    </varlistentry>
+  </variablelist>
 </refsect1>
 
 </refentry>
diff --git a/gtk/gtk-launch.c b/gtk/gtk-launch.c
index 15d183b..576a449 100644
--- a/gtk/gtk-launch.c
+++ b/gtk/gtk-launch.c
@@ -33,9 +33,11 @@
 #endif
 #include <gtk.h>
 
+static gboolean show_version;
 static gchar **args = NULL;
 
 static GOptionEntry entries[] = {
+  { "version", 0, 0, G_OPTION_ARG_NONE, &show_version, NULL, NULL },
   { G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_FILENAME_ARRAY, &args, NULL, NULL },
   { NULL}
 };
@@ -66,14 +68,14 @@ main (int argc, char *argv[])
 #endif
 
   /* Translators: this message will appear immediately after the */
-  /* usage string - Usage: COMMAND [OPTION]… <THIS_MESSAGE>    */
+  /* usage string - Usage: COMMAND [OPTION...] <THIS_MESSAGE>    */
   context =
-    g_option_context_new (_("APPLICATION [URI…] — launch an APPLICATION with URI."));
+    g_option_context_new (_("APPLICATION [URI...] — launch an APPLICATION"));
 
   /* Translators: this message will appear after the usage string */
   /* and before the list of options.                              */
-  summary = _("Launch specified application by its desktop file info\n"
-              "optionally passing list of URIs as arguments.");
+  summary = _("Launch an application (specified by its desktop file name),\n"
+              "optionally passing one or more URIs as arguments.");
   g_option_context_set_summary (context, summary);
   g_option_context_add_main_entries (context, entries, GETTEXT_PACKAGE);
   g_option_context_add_group (context, gtk_get_option_group (FALSE));
@@ -86,21 +88,28 @@ main (int argc, char *argv[])
     {
       g_printerr (_("Error parsing commandline options: %s\n"), error->message);
       g_printerr ("\n");
-      g_printerr (_("Try \"%s --help\" for more information."),
-                  g_get_prgname ());
+      g_printerr (_("Try \"%s --help\" for more information."), g_get_prgname ());
       g_printerr ("\n");
-      g_error_free(error);
+      g_error_free (error);
       return 1;
     }
 
+  if (show_version)
+    {
+      g_print ("%d.%d.%d\n",
+               gtk_get_major_version (),
+               gtk_get_minor_version (),
+               gtk_get_micro_version ());
+      return 0;
+    }
+
   if (!args)
     {
       /* Translators: the %s is the program name. This error message */
       /* means the user is calling gtk-launch without any argument.  */
       g_printerr (_("%s: missing application name"), g_get_prgname ());
       g_printerr ("\n");
-      g_printerr (_("Try \"%s --help\" for more information."),
-                  g_get_prgname ());
+      g_printerr (_("Try \"%s --help\" for more information."), g_get_prgname ());
       g_printerr ("\n");
       return 1;
     }
@@ -112,7 +121,7 @@ main (int argc, char *argv[])
 #ifdef G_OS_UNIX
   if (g_str_has_suffix (app_name, ".desktop"))
     desktop_file_name = g_strdup (app_name);
-  else 
+  else
     desktop_file_name = g_strconcat (app_name, ".desktop", NULL);
   info = G_APP_INFO (g_desktop_app_info_new (desktop_file_name));
   g_free (desktop_file_name);