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search.c

/* pal
 *
 * Copyright (C) 2004, Scott Kuhl
 *
 * 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 <sys/types.h> /* FreeBSD, regex.h needs this */
#include <regex.h>     /* regular expressions */

#include "main.h"
#include "output.h"
#include "event.h"

/* returns a list of the events matching the 'search' string.  'date'
 * is the starting date.  'window' is the number of days from the
 * starting date to search.
 *
 * The returned list alternates between GDate and PalEvent pointers.
 * The GDate pointer allows the caller to determine the date the event
 * was found on (because the event could be recurring and happen
 * multiple times).  The GDate pointers in the list should be freed.
 * The PalEvent pointers should not be freed.
*/

GList* pal_search_get_results(const gchar* search, GDate* date, const gint window)
{
    regex_t preg;
    gint i,j;
    GList* hit_list = NULL;

    if(settings->reverse_order)
      g_date_add_days(date, window-1);

    regcomp(&preg, search, REG_ICASE|REG_NOSUB);

    for(i=0; i<window; i++)
    {
      GList* events = get_events(date);

      if(events != NULL)
      {
          GList* item = g_list_first(events);
          for(j=0; j<g_list_length(events); j++)
          {

            if(regexec(&preg, ((PalEvent*) (item->data))->text, 0, NULL, 0)==0 ||
               regexec(&preg, ((PalEvent*) (item->data))->type, 0, NULL, 0)==0)
            {
                GDate* tmp = g_malloc(sizeof(GDate));
                memcpy(tmp, date, sizeof(GDate));
                hit_list = g_list_append(hit_list, tmp);
                hit_list = g_list_append(hit_list, item->data);
            }

            item = g_list_next(item);
          }
      }

      if(settings->reverse_order)
          g_date_subtract_days(date, 1);
      else
          g_date_add_days(date, 1);
    }

    /* put 'date' back where it started */
    if(settings->reverse_order)
      g_date_add_days(date, 1);
    else
      g_date_subtract_days(date, window);

    regfree(&preg);
    return hit_list;
}


/* returns the number of events found */
int pal_search_view(const gchar* search_string, GDate* date, const gint window, const gboolean number_events)
{
    GList* hit_list = pal_search_get_results(search_string, date, window);
    GList* item = NULL;
    int hit_count = g_list_length(hit_list) / 2;
    int event_count = 1;
    gchar start_date[128];
    gchar end_date[128];

    g_date_strftime(start_date, 128, settings->date_fmt, date);
    g_date_add_days(date, window-1);
    g_date_strftime(end_date, 128, settings->date_fmt, date);
    g_date_subtract_days(date, window-1);

    pal_output_attr(BRIGHT, _("[ Begin search results: %s ]\n[ From %s to %s inclusive ]\n\n"),
                search_string, start_date, end_date);

    item = g_list_first(hit_list);

    while(g_list_length(item) != 0)
    {
      PalEvent* event_tmp = NULL;
      GDate* date_tmp = NULL;
      GDate* next_date = NULL;

      date_tmp  = (GDate*)    (item->data);
      item = g_list_next(item);
      event_tmp = (PalEvent*) (item->data);
      item = g_list_next(item);

      if(!settings->compact_list)
          pal_output_date_line(date_tmp);

      if(number_events)
          pal_output_event(event_tmp, date_tmp, event_count++);
      else
          pal_output_event(event_tmp, date_tmp, -1);

      if(g_list_length(item) != 0)
          next_date = (GDate*) item->data;

      while(g_list_length(item) != 0 && g_date_compare(next_date, date_tmp) == 0)
      {
          g_date_free(date_tmp);

          date_tmp  = (GDate*)    (item->data);
          item = g_list_next(item);
          event_tmp = (PalEvent*) (item->data);
          item = g_list_next(item);

          if(number_events)
            pal_output_event(event_tmp, date_tmp, event_count++);
          else
            pal_output_event(event_tmp, date_tmp, -1);

          if(g_list_length(item) != 0)
            next_date = (GDate*) item->data;
      }

      g_date_free(date_tmp);

      if(!settings->compact_list)
          g_print("\n");
    }

    g_list_free(hit_list);

    /* no extra newlines when using compact list, so add one here */
    if(settings->compact_list)
      g_print("\n");

    pal_output_attr(BRIGHT, _("[ End search results: %s ] [ %d %s found ]\n"),
                search_string, hit_count, hit_count == 1 ? "event" : "events");

    return hit_count;
}



/* Returns the event 'event_number' from the search.  Stores the date
 * the event occurs on in store_date */
PalEvent* pal_search_event_num(gint event_number, GDate** store_date, const gchar* search_string, GDate* date, const gint window)
{
    PalEvent* ret_val = NULL;
    GList* hit_list = pal_search_get_results(search_string, date, window);
    gint num_events = g_list_length(hit_list) / 2;
    GList* tmp = NULL;

    if(hit_list == NULL || event_number < 1 || event_number > num_events)
      return NULL;

    *store_date = (GDate*) g_list_nth_data(hit_list, (event_number-1)*2);
    ret_val = (PalEvent*) g_list_nth_data(hit_list, (event_number-1)*2+1);

    tmp = g_list_first(hit_list);
    while(tmp != NULL)
    {
      if(*store_date != (GDate*) (tmp->data))
          g_date_free((GDate*) (tmp->data));
      tmp = g_list_next(tmp);
      tmp = g_list_next(tmp);
    }

    g_list_free(hit_list);

    return ret_val;

}

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