Switching the GTK1 theme

[Owen Taylor <otaylor redhat com>]

The attached patches make the control center switch the
gtk1 theme along with the gtk2 theme.

The way it works is:

 * gnome-session sets the GTK_RC_FILES environment to:

     /etc/gtk/gtkrc:$HOME/.gtkrc-1.2-gnome2

 * gnome-settings-daemon reads the /desktop/gnome/interface/gtk_theme
   GConf key, and determines a GTK+-1.2 theme to set as:

    * If gtk_theme is Default, Raleigh, if a gtk+-1.2 Raleigh theme is
      present.
      * Otherwise, if a gtk+-1.2 theme with the same name as gtk_theme
          exists, use that.
        * Otherwise, use Raleigh, if it is present.

   It then writes an appropriate ~/.gtkrc-1.2-gnome2, and if the contents
   of ~/.gtkrc-1.2-gnome2 changed, sends a client message to cause
   gtk1 apps to reread their RC files.

These patches depend on a change that I proposed in April and
finally just put into CVS to make GTK+-2.x read GTK2_RC_FILES rather
than GTK_RC_FILES.

THe patches are against the release tarballs, but I would consider
this a 2.2 change, so we'd need to branch gnome-session first.

Regards,
                                        Owen

--- gnome-session-2.0.1/gnome-session/main.c.gtk1theme	Mon Jun 17 02:33:39 2002
+++ gnome-session-2.0.1/gnome-session/main.c	Wed Jul 24 16:25:30 2002
@@ -128,6 +128,19 @@
     }
 }
 
+/* Point GTK_RC_FILES at a separate file that we change in
+ * in gnome-settings-daemon.
+ */
+static void
+set_gtk1_theme_rcfile (void)
+{
+  char *env_string;
+
+  env_string = g_strdup_printf ("GTK_RC_FILES=" SYSCONFDIR "/gtk/gtkrc:%s/.gtkrc-1.2-gnome2", g_get_home_dir ());
+
+  putenv (env_string);
+}
+
 static void
 update_boolean (GConfClient *client,
 		guint cnxn_id,
@@ -160,6 +173,7 @@
     gsm_set_verbose (TRUE);
   
   set_lang();
+  set_gtk1_theme_rcfile ();
 
   /* Initialize the i18n stuff */
   bindtextdomain (GETTEXT_PACKAGE, GNOMELOCALEDIR);

--- control-center-2.0.0/gnome-settings-daemon/gnome-settings-gtk1theme.c.gtk1theme	Wed Jul 24 16:13:08 2002
+++ control-center-2.0.0/gnome-settings-daemon/gnome-settings-gtk1theme.c	Wed Jul 24 16:13:08 2002
@@ -0,0 +1,220 @@
+/* -*- mode: c; style: linux -*- */
+
+/* gnome-settings-gtk1theme.c
+ *
+ * Copyright © 2002 Red Hat, Inc.
+ *
+ * Written by Owen Taylor <otaylor redhat com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "gnome-settings-daemon.h"
+#include "gnome-settings-gtk1theme.h"
+
+#define GTK_THEME_KEY "/desktop/gnome/interface/gtk_theme"
+
+/* Given the theme filename, return the needed contents for the RC file
+ * in the user's home directory
+ */
+static char *
+make_contents (const char *filename)
+{
+	GString *result = g_string_new (NULL);
+
+	g_string_append (result,
+			 "# Autowritten by gnome-settings-daemon. Do not edit\n"
+			 "\n");
+	if (filename)
+		g_string_append_printf (result,
+					"include \"%s\"\n"
+					"\n",
+					filename);
+	g_string_append_printf (result, 
+                                "include \"%s/.gtkrc.mine\"\n",
+				g_get_home_dir ());
+
+	return g_string_free (result, FALSE);
+}
+
+/* Writes @contents to @rc_filename atomically (using rename); returns
+ * %TRUE on sucess
+ */
+static gboolean
+write_contents (const char *rc_filename,
+		const char *contents)
+{
+	char *tmp_filename = g_strconcat (rc_filename, ".new", NULL);
+	GIOChannel *channel;
+	GError *err = NULL;
+
+	channel =  g_io_channel_new_file (tmp_filename, "w", &err);
+	if (!channel) {
+		g_warning ("Cannot open %s: %s", tmp_filename, err->message);
+		goto bail2;
+	}
+
+	if (g_io_channel_write_chars (channel, contents, -1, NULL, &err) != G_IO_STATUS_NORMAL) {
+		g_warning ("Cannot open %s: %s", tmp_filename, err->message);
+		goto bail0;
+	}
+
+	if (g_io_channel_flush (channel, &err) != G_IO_STATUS_NORMAL) {
+		g_warning ("Error flushing %s: %s", tmp_filename, err->message);
+		goto bail0;
+	}
+
+	if (g_io_channel_shutdown (channel, TRUE, &err) != G_IO_STATUS_NORMAL) {
+		g_warning ("Error closing %s: %s", tmp_filename, err->message);
+		goto bail1;
+	}
+
+	if (rename (tmp_filename, rc_filename) < 0) {
+		g_warning ("Cannot move %s to %s: %s", tmp_filename, rc_filename, g_strerror (errno));
+		goto bail1;
+		
+	}
+
+	g_free (tmp_filename);
+	
+	return TRUE;
+
+ bail0:
+	g_io_channel_shutdown (channel, FALSE, NULL);
+ bail1:
+	unlink (tmp_filename);
+ bail2:
+	g_clear_error (&err);
+	g_free (tmp_filename);
+
+	return FALSE;
+}
+
+/* Send a client message telling GTK+-1.2 apps to reread their RC files
+ */
+static void
+send_change_message (void)
+{
+	GdkEventClient sev;
+	int i;
+  
+	for(i = 0; i < 5; i++)
+		sev.data.l[i] = 0;
+	
+	sev.data_format = 32;
+	sev.message_type = gdk_atom_intern("_GTK_READ_RCFILES", FALSE);
+	
+	gdk_event_send_clientmessage_toall ((GdkEvent *) &sev);
+}
+
+/* See if a theme called @theme exists in @base_dir. Takes ownership of @base_dir
+ */
+static char *
+check_filename (char       *base_dir,
+		const char *theme)
+{
+	char *theme_filename = g_build_filename (base_dir, theme, "gtk", "gtkrc", NULL);
+	
+	if (!g_file_test (theme_filename, G_FILE_TEST_EXISTS)) {
+		g_free (theme_filename);
+		theme_filename = NULL;
+	}
+
+	g_free (base_dir);
+
+	return theme_filename;
+}
+
+static void
+apply_settings (void)
+{
+	GConfClient *client = gconf_client_get_default ();
+	gchar *current_theme;
+	gchar *theme_filename;
+	gchar *rc_filename;
+	gchar *current_contents;
+	gint current_length;
+	gchar *new_contents;
+	GError *err = NULL;
+
+	current_theme = gconf_client_get_string (client, GTK_THEME_KEY, NULL);
+	if (!current_theme)
+		current_theme = g_strdup ("Default");
+
+	/* Translate Default into Raleigh, since it's a better
+	 * match than the default gtk1 theme.
+	 */
+	if (strcmp (current_theme, "Default") == 0) {
+		g_free (current_theme);
+		current_theme = g_strdup ("Raleigh");
+	}
+
+	/* Now look for a gtk1 theme with the name
+	 */
+	theme_filename = check_filename (g_build_filename (g_get_home_dir (),".themes", NULL),
+					 current_theme);
+
+	if (!theme_filename) {
+		theme_filename = check_filename (g_build_filename (DATADIR, "themes", NULL),
+						 current_theme);
+	}
+
+	/* If we don't find a match, use Raleigh
+	 */
+	if (!theme_filename) {
+		theme_filename = check_filename (g_build_filename (DATADIR, "themes", NULL),
+						 "Raleigh");
+	}
+
+	rc_filename = g_build_filename (g_get_home_dir(), ".gtkrc-1.2-gnome2", NULL);
+	
+	if (!g_file_get_contents (rc_filename, &current_contents, &current_length, &err) &&
+	    !g_error_matches (err, G_FILE_ERROR, G_FILE_ERROR_NOENT)) {
+		g_warning ("Can't get contents of %s: %s", rc_filename, err->message);
+		g_clear_error (&err);
+	}
+	
+	new_contents = make_contents (theme_filename);
+	
+	if (!current_contents ||
+	    current_length != strlen (new_contents) ||
+	    memcmp (current_contents, new_contents, current_length) != 0) {
+		if (write_contents (rc_filename, new_contents))
+			send_change_message ();
+	}
+		
+	g_object_unref (client);
+	g_free (new_contents);
+	g_free (current_contents);
+	g_free (rc_filename);
+}
+
+void
+gnome_settings_gtk1_theme_init (GConfClient *client)
+{
+	gnome_settings_daemon_register_callback (GTK_THEME_KEY, (KeyCallbackFunc) apply_settings);
+}
+
+void
+gnome_settings_gtk1_theme_load (GConfClient *client)
+{
+	apply_settings ();
+}
--- control-center-2.0.0/gnome-settings-daemon/Makefile.am.gtk1theme	Wed May 29 20:25:29 2002
+++ control-center-2.0.0/gnome-settings-daemon/Makefile.am	Wed Jul 24 16:17:30 2002
@@ -1,4 +1,4 @@
-INCLUDES=$(GNOME_SETTINGS_DAEMON_CFLAGS) -I$(top_srcdir)/libbackground -I$(top_srcdir) -DGNOMELOCALEDIR="\"$(datadir)/locale\""
+INCLUDES=$(GNOME_SETTINGS_DAEMON_CFLAGS) -I$(top_srcdir)/libbackground -I$(top_srcdir) -DGNOMELOCALEDIR="\"$(datadir)/locale\"" -DDATADIR="\"$(datadir)\""
 
 bin_PROGRAMS=gnome-settings-daemon
 
@@ -28,6 +28,8 @@
 	gnome-settings-screensaver.c	\
 	gnome-settings-default-editor.c	\
 	gnome-settings-default-editor.h	\
+	gnome-settings-gtk1theme.c      \
+	gnome-settings-gtk1theme.h	\
 	xsettings-common.c		\
 	xsettings-manager.c		\
 	xsettings-common.h		\
--- control-center-2.0.0/gnome-settings-daemon/gnome-settings-gtk1theme.h.gtk1theme	Wed Jul 24 16:13:08 2002
+++ control-center-2.0.0/gnome-settings-daemon/gnome-settings-gtk1theme.h	Wed Jul 24 16:13:08 2002
@@ -0,0 +1,34 @@
+/* -*- mode: c; style: linux -*- */
+
+/* gnome-settings-keyboard.h
+ *
+ * Copyright © 2002 Red Hat, Inc.
+ *
+ * Written by Owen Taylor <otaylor redhat com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef __GNOME_SETTINGS_GTK1THEME_H
+#define __GNOME_SETTINGS_GTK1THEME_H
+
+#include <gconf/gconf.h>
+#include <gconf/gconf-client.h>
+
+void gnome_settings_gtk1_theme_init (GConfClient *client);
+void gnome_settings_gtk1_theme_load (GConfClient *client);
+
+#endif
--- control-center-2.0.0/gnome-settings-daemon/gnome-settings-daemon.c.gtk1theme	Wed May 29 20:25:29 2002
+++ control-center-2.0.0/gnome-settings-daemon/gnome-settings-daemon.c	Wed Jul 24 16:13:08 2002
@@ -46,6 +46,7 @@
 #include "gnome-settings-screensaver.h"
 #include "gnome-settings-default-editor.h"
 #include "gnome-settings-keybindings.h"
+#include "gnome-settings-gtk1theme.h"
 
 #include "GNOME_SettingsDaemon.h"
 
@@ -241,6 +242,7 @@
   gnome_settings_default_editor_init (client);
   gnome_settings_background_init (client);
   gnome_settings_keybindings_init (client);
+  gnome_settings_gtk1_theme_init (client);
 
   for (list = directories; list; list = list->next)
     {
@@ -281,6 +283,7 @@
   gnome_settings_default_editor_load (client);
   gnome_settings_background_load (client);
   gnome_settings_keybindings_load (client);
+  gnome_settings_gtk1_theme_load (client);
 
   return G_OBJECT (daemon);
 }