From 836434f1f05c201d413f0fcf94e8ba0b23641920 Mon Sep 17 00:00:00 2001
From: Richard Hestilow <hestilow@ximian.com>
Date: Mon, 21 Jan 2002 22:44:12 +0000
Subject: [PATCH] Use nautilus as the shell if it is already running.

2002-01-21  Richard Hestilow  <hestilow@ximian.com>

	* main.c: Use nautilus as the shell if it is already running.
---
 control-center/ChangeLog |  4 +++
 control-center/main.c    | 72 ++++++++++++++++++++++++++++++++++++++--
 2 files changed, 74 insertions(+), 2 deletions(-)

diff --git a/control-center/ChangeLog b/control-center/ChangeLog
index a2331711f..b4f30ac77 100644
--- a/control-center/ChangeLog
+++ b/control-center/ChangeLog
@@ -1,3 +1,7 @@
+2002-01-21  Richard Hestilow  <hestilow@ximian.com>
+
+	* main.c: Use nautilus as the shell if it is already running.
+
 2002-01-17  Jakub Steiner <jimmac@ximian.com>
 
 	* control-center.png: fix the antialiasing
diff --git a/control-center/main.c b/control-center/main.c
index 140ce3ef6..83a9515e6 100644
--- a/control-center/main.c
+++ b/control-center/main.c
@@ -29,10 +29,77 @@
 #include <glade/glade.h>
 #include <bonobo.h>
 #include <gconf/gconf.h>
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <gdk/gdkx.h>
 
 #include "capplet-dir.h"
 #include "capplet-dir-view.h"
 
+static gboolean
+is_nautilus_running (void)
+{
+	Atom window_id_atom;
+	Window nautilus_xid;
+	Atom actual_type;
+	int actual_format;
+	unsigned long nitems, bytes_after;
+	unsigned char *data;
+	int retval;
+	Atom wmclass_atom;
+	gboolean running;
+	gint error;
+
+	window_id_atom = XInternAtom (GDK_DISPLAY (), 
+				      "NAUTILUS_DESKTOP_WINDOW_ID", True);
+
+	if (window_id_atom == None) return FALSE;
+
+	retval = XGetWindowProperty (GDK_DISPLAY (), GDK_ROOT_WINDOW (),
+				     window_id_atom, 0, 1, False, XA_WINDOW,
+				     &actual_type, &actual_format, &nitems,
+				     &bytes_after, &data);
+
+	if (data != NULL) {
+		nautilus_xid = *(Window *) data;
+		XFree (data);
+	} else {
+		return FALSE;
+	}
+
+	if (actual_type != XA_WINDOW) return FALSE;
+	if (actual_format != 32) return FALSE;
+
+	wmclass_atom = XInternAtom (GDK_DISPLAY (), "WM_CLASS", False);
+
+	gdk_error_trap_push ();
+
+	retval = XGetWindowProperty (GDK_DISPLAY (), nautilus_xid,
+				     wmclass_atom, 0, 24, False, XA_STRING,
+				     &actual_type, &actual_format, &nitems,
+				     &bytes_after, &data);
+
+	error = gdk_error_trap_pop ();
+
+	if (error == BadWindow) return FALSE;
+
+	if (actual_type == XA_STRING &&
+	    nitems == 24 &&
+	    bytes_after == 0 &&
+	    actual_format == 8 &&
+	    data != NULL &&
+	    !strcmp (data, "desktop_window") &&
+	    !strcmp (data + strlen (data) + 1, "Nautilus"))
+		running = TRUE;
+	else
+		running = FALSE;
+
+	if (data != NULL)
+		XFree (data);
+
+	return running;
+}
+
 int
 main (int argc, char **argv) 
 {
@@ -48,8 +115,9 @@ main (int argc, char **argv)
 			    GNOME_PARAM_APP_DATADIR, GNOMECC_DATA_DIR,
 			    NULL);
 
-	gconf_init (argc, argv, NULL);
-
+	if (is_nautilus_running ())
+		execlp ("nautilus", "nautilus", "preferences:///", NULL);
+	
 	gnomecc_init ();
 	dir = get_root_capplet_dir ();
 	if (dir == NULL)