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todo.c

/*    $calcurse: todo.c,v 1.4 2006/09/02 09:20:35 culot Exp $     */

/*
 * Calcurse - text-based organizer
 * Copyright (c) 2004-2006 Frederic Culot
 *
 * 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.
 *
 * Send your feedback or comments to : calcurse@culot.org
 * Calcurse home page : http://culot.org/calcurse
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "vars.h"
#include "utils.h"
#include "i18n.h"
#include "todo.h"

struct todo_s *todolist;

/* Request user to enter a new todo item. */
int todo_new_item(int total, int colr)
{
      int ch = 0;
      char *mesg = _("Enter the new ToDo item : ");
      char *mesg_id = 
            _("Enter the ToDo priority [1 (highest) - 9 (lowest)] :");
      char todo_input[MAX_LENGTH];

      status_mesg(mesg, "");
      getstring(swin, colr, todo_input, 0, 1);
      if (strlen(todo_input) != 0) {
            while ( (ch < '1') || (ch > '9') ) {
                  status_mesg(mesg_id, "");
                  ch = wgetch(swin);
            }
            todo_add(todo_input, ch - '0');
            total++;
      }

      return total;
}

/* Add an item in the todo linked list. */
struct todo_s *todo_add(char *mesg, int id)
{
      struct todo_s *o, **i;
      o = (struct todo_s *) malloc(sizeof(struct todo_s));
      o->mesg = (char *) malloc(strlen(mesg) + 1);
      strcpy(o->mesg, mesg);
      o->id = id;
      i = &todolist;
      for (;;) {
            if (*i == 0 || (*i)->id > id) {
                  o->next = *i;
                  *i = o;
                  break;
            }
            i = &(*i)->next;
      }
      return o;
}

/* Delete an item from the todo linked list. */
void todo_delete_bynum(unsigned num)
{
      unsigned n;
      struct todo_s *i, **iptr;

      n = 0;
      iptr = &todolist;
      for (i = todolist; i != 0; i = i->next) {
            if (n == num) {
                  *iptr = i->next;
                  free(i->mesg);
                  free(i);
                  return;
            }
            iptr = &i->next;
            n++;
      }
      /* NOTREACHED */
      fputs(_("FATAL ERROR in todo_delete_bynum: no such todo\n"), stderr);
      exit(EXIT_FAILURE);
}

/* Returns a structure containing the selected item. */
struct todo_s *todo_get_item(int item_number)
{
      struct todo_s *o;
      int i;
      
      o = todolist;
      for (i = 1; i < item_number; i++) {
            o = o->next;
      }
      return o;
}

/* 
 * Returns the position into the linked list corresponding to the
 * given todo_s item.
 */
int todo_get_position(struct todo_s *i)
{
      struct todo_s *o;
      int n = 1, found = 0;
      
      for (o = todolist; o; o = o->next) {
            if (o == i) {
                  found = 1;
                  break;
            }
            n++;
      }
      if (found) {
            return n;   
      } else {
            fputs(_("FATAL ERROR in todo_get_position: todo not found\n"), 
                  stderr);
            exit(EXIT_FAILURE);
      } 
}

/* Change an item priority by pressing '+' or '-' inside TODO panel. */
int todo_chg_priority(int action, int item_num)
{
      struct todo_s *backup;
      char backup_mesg[MAX_LENGTH];
      int backup_id;
      int do_chg = 1, new_position;

      backup = todo_get_item(item_num);
      strncpy(backup_mesg, backup->mesg, strlen(backup->mesg) + 1);
      backup_id = backup->id;
      if (action == '+') {
            (backup_id > 1) ? backup_id-- : do_chg--;
      } else if (action == '-') {
            (backup_id < 9) ? backup_id++ : do_chg--;
      } else { /* NOTREACHED */
            fputs(_("FATAL ERROR in todo_chg_priority: no such action\n"),
                  stderr);
      }     
      if (do_chg) {
            todo_delete_bynum(item_num - 1);
            backup = todo_add(backup_mesg, backup_id);
            new_position = todo_get_position(backup); 
      } else {
            new_position = item_num;
      }
      return new_position;
}

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