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history.c

/* X-Chat
 * Copyright (C) 1998 Peter Zelezny.
 *
 * 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 of the License, 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 <stdlib.h>
#include "history.h"

void
history_add (struct history *his, char *text)
{
      if (his->lines[his->realpos])
            free (his->lines[his->realpos]);
      his->lines[his->realpos] = strdup (text);
      his->realpos++;
      if (his->realpos == HISTORY_SIZE)
            his->realpos = 0;
      his->pos = his->realpos;
}

void
history_free (struct history *his)
{
      int i;
      for (i = 0; i < HISTORY_SIZE; i++)
      {
            if (his->lines[i])
            {
                  free (his->lines[i]);
                  his->lines[i] = 0;
            }
      }
}

char *
history_down (struct history *his)
{
      int next;

      if (his->pos == his->realpos) /* allow down only after up */
            return 0;
      if (his->realpos == 0)
      {
            if (his->pos == HISTORY_SIZE - 1)
            {
                  his->pos = 0;
                  return "";
            }
      } else
      {
            if (his->pos == his->realpos - 1)
            {
                  his->pos++;
                  return "";
            }
      }

      next = 0;
      if (his->pos < HISTORY_SIZE - 1)
            next = his->pos + 1;

      if (his->lines[next])
      {
            his->pos = next;
            return his->lines[his->pos];
      }

      return 0;
}

char *
history_up (struct history *his, char *current_text)
{
      int next;

      if (his->realpos == HISTORY_SIZE - 1)
      {
            if (his->pos == 0)
                  return 0;
      } else
      {
            if (his->pos == his->realpos + 1)
                  return 0;
      }

      next = HISTORY_SIZE - 1;
      if (his->pos != 0)
            next = his->pos - 1;

      if (his->lines[next])
      {
            if
            (
                  current_text[0] && strcmp(current_text, his->lines[next]) &&
                  (!his->lines[his->pos] || strcmp(current_text, his->lines[his->pos])) &&
                  (!his->lines[his->realpos] || strcmp(current_text, his->lines[his->pos]))
            )
            {
                  history_add (his, current_text);
            }
            
            his->pos = next;
            return his->lines[his->pos];
      }

      return 0;
}

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