multiscreen execing functions

/* egg-screen-exec.c
 *
 * Copyright (C) 2002  Sun Microsystems Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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: Mark McLoughlin <[email protected]>
 */

#include <config.h>

#include "egg-screen-exec.h"

#include <string.h>
#include <libgnome/gnome-exec.h>

#ifndef HAVE_GTK_MULTIHEAD
#include <gdk/gdkx.h>
#endif

extern char **environ;

char *
egg_screen_exec_display_string (GdkScreen *screen)
{
#ifdef HAVE_GTK_MULTIHEAD
	GString    *str;
	const char *old_display;
	char       *retval;
	char       *p;

	old_display = gdk_display_get_name (gdk_display_get_default ());

	str = g_string_new ("DISPLAY=");
	g_string_append (str, old_display);

	p = strrchr (str->str, '.');
	if (p && p >  strchr (str->str, ':'))
		g_string_truncate (str, p - str->str);

	g_string_append_printf (str, ".%d", gdk_screen_get_number (screen));

	retval = str->str;

	g_string_free (str, FALSE);

	return retval;
#else
	return g_strdup (DisplayString (GDK_DISPLAY ()));
#endif
}

char **
egg_screen_exec_environment (GdkScreen *screen)
{
#ifdef HAVE_GTK_MULTIHEAD
	char **retval = NULL;
	int    display_index = -1;
	int    i;

	for (i = 0; environ [i]; i++)
		if (!strncmp (environ [i], "DISPLAY", 7))
			display_index = i;

	if (display_index == -1)
		display_index = i++;

	retval = g_new (char *, i + 1);

	for (i = 0; environ [i]; i++)
		if (i == display_index)
			retval [i] = egg_screen_exec_display_string (screen);
		else
			retval [i] = g_strdup (environ [i]);
	retval [i] = NULL;

	return retval;
#else
	int i;

	for (i = 0; environ [i]; i++);

	retval = g_new (char *, i + 1);

	for (i = 0; environ [i]; i++)
		retval [i] = g_strdup (environ [i]);
	retval [i] = NULL;

	return retval;
#endif
}

int
egg_screen_execute_async (GdkScreen    *screen,
                          const char   *dir,
                          int           argc,
                          char * const  argv [])
{
#ifdef HAVE_GTK_MULTIHEAD
	char **envp = NULL;
	int    envc = 0;
	int    retval;

	g_return_val_if_fail (GDK_IS_SCREEN (screen), -1);

	if (gdk_screen_get_default () != screen) {
		envc = 1;
		envp = g_new0 (char *, 2);
		envp [0] = egg_screen_exec_display_string (screen);
	}

	retval = gnome_execute_async_with_env (dir, argc, argv, envc, envp);

	g_strfreev (envp);

	return retval;
#else
	return gnome_execute_async (dir, argc, argv);
#endif
}

int
egg_screen_execute_shell (GdkScreen    *screen,
                          const char   *dir,
                          const char   *command)
{
#ifdef HAVE_GTK_MULTIHEAD
	int retval = -1;

	g_return_val_if_fail (GDK_IS_SCREEN (screen), -1);

	if (gdk_screen_get_default () == screen)
		retval = gnome_execute_shell (dir, command);

	else {
		char *exec;
		char *display;

		display = egg_screen_exec_display_string (screen);
		exec = g_strconcat (display, " ", command, NULL);

		retval = gnome_execute_shell (dir, exec);

		g_free (display);
		g_free (exec);
	}

	return retval;
#else
	return gnome_execute_shell (dir, command);
#endif
}

gboolean
egg_screen_execute_command_line_async (GdkScreen    *screen,
                                       const char   *command,
                                       GError      **error)
{
#ifdef HAVE_GTK_MULTIHEAD
	gboolean   retval;
	char     **argv = NULL;
	char     **envp = NULL;

	g_return_val_if_fail (command != NULL, FALSE);

	if (!g_shell_parse_argv (command, NULL, &argv, error))
		return FALSE;

	if (gdk_screen_get_default () != screen)
		envp = egg_screen_exec_environment (screen);

	retval = g_spawn_async (g_get_home_dir (),
				argv, envp, G_SPAWN_SEARCH_PATH,
				NULL, NULL, NULL, error);
	g_strfreev (argv);
	g_strfreev (envp);

	return retval;
#else
	return g_spawn_command_line_async (command, error);
#endif
}

/* egg-screen-exec.h
 *
 * Copyright (C) 2002  Sun Microsystems Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library 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: Mark McLoughlin <[email protected]>
 */

#ifndef __EGG_SCREEN_EXEC_H__
#define __EGG_SCREEN_EXEC_H__

#include <gdk/gdk.h>

G_BEGIN_DECLS

char      *egg_screen_exec_display_string        (GdkScreen    *screen);
char     **egg_screen_exec_environment           (GdkScreen    *screen);

int        egg_screen_execute_async              (GdkScreen    *screen,
                                                  const char   *dir,
                                                  int           argc,
                                                  char * const  argv []);
int        egg_screen_execute_shell              (GdkScreen    *screen,
                                                  const char   *dir,
                                                  const char   *command);
gboolean   egg_screen_execute_command_line_async (GdkScreen    *screen,
                                                  const char   *command,
                                                  GError      **error);

G_END_DECLS

#endif /* __EGG_SCREEN_EXEC_H__ */