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autosave.c

/*
 * autosave.c -- the core of the autosave functionality
 *             
 *
 * Copyright (C) 2001,2003 Øyvind Kolås <pippin@users.sourceforge.net>
 *
 * 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 <string.h>
#include <unistd.h>
#include "tree.h"
#include "prefs.h"
#include "ui.h"
#include <cli.h>

static int nodes_changed=0;        /* counter for number of changes since saves */
static int autosave_threshold=0;   /* autosave for every autosave_threshold nodes_changed */
static int autosave_timeout=50;    /* ticks to wait for autosaving, if there is nodes changed */
static int autosave_timer=0;
static int autosave_sync=1;

static void autosave_invoke(Node *pos){

      if (prefs.db_file[0]!= (char) 255) { /* magic value when tutorial is shown */
            {
                  char buf[4096];
                  
                  sprintf (buf, "export_binary %s_hnb_rescue", prefs.db_file);            
                  docmd (node_root(pos), buf);
                  cli_outfunf("autosaved, %i nodes changed\n",nodes_changed);
            }
      }
      if(autosave_sync)
            sync();
      nodes_changed=0;
      autosave_timer=0;
}

static int tree_changed_cmd (int argc, char **argv, void *data)
{
            /* TODO: add increment handling, for "extreme changes" */
      Node *pos = (Node *) data;
      nodes_changed++;
      if(autosave_threshold<=nodes_changed)
            autosave_invoke(pos);
      return (int) pos;
}

static int autosave_check_timeout (int argc, char **argv, void *data)
{
      Node *pos = (Node *) data;
      if(nodes_changed){
            autosave_timer++;
            if(autosave_timeout && autosave_timeout < autosave_timer){
                  autosave_invoke(pos);
            }           
      }
      return (int) pos;
}

/*
!init_autosave();
*/
void init_autosave ()
{
      cli_add_command ("tree_changed", tree_changed_cmd, "[increment]");
      cli_add_help ("tree_changed",
                          "used internally to drive the autosave functionality, for severe changes, pass a high number(1000), to make sure the radical changes are saved _NOW_, otherwise don't pass an increment");
      cli_add_command ("autosave_check_timeout", autosave_check_timeout, "");
      cli_add_int ("autosave_timeout", &autosave_timeout, "number of ticks before autosaving after change");
      cli_add_int ("autosave_sync", &autosave_sync, "whether the filesystem should be synced after autosave");
      cli_add_int ("autosave_timer", &autosave_timer, "number of ticks since unsaved change");
      cli_add_int ("autosave_threshold", &autosave_threshold,
                              "save for evrery autosave_threshold nodes changed");
      cli_add_int ("autosave_threshold_nodes_changed", &nodes_changed,
                              "counter for number of changes since save");
}

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