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/* tags.c - Iterator for tags returned from message or thread
*
* Copyright © 2009 Carl Worth
*
* 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 3 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, see http://www.gnu.org/licenses/ .
*
* Author: Carl Worth <cworth@cworth.org>
*/
#include "notmuch-private.h"
#include <glib.h> /* GList */
struct _notmuch_tags {
int sorted;
GList *tags;
GList *iterator;
};
/* XXX: Should write some talloc-friendly list to avoid the need for
* this. */
static int
_notmuch_tags_destructor (notmuch_tags_t *tags)
{
g_list_free (tags->tags);
return 0;
}
/* Create a new notmuch_tags_t object, with 'ctx' as its talloc owner.
*
* This function can return NULL in case of out-of-memory.
*/
notmuch_tags_t *
_notmuch_tags_create (void *ctx)
{
notmuch_tags_t *tags;
tags = talloc (ctx, notmuch_tags_t);
if (unlikely (tags == NULL))
return NULL;
talloc_set_destructor (tags, _notmuch_tags_destructor);
tags->sorted = 1;
tags->tags = NULL;
tags->iterator = NULL;
return tags;
}
/* Add a new tag to 'tags'. The tags object will create its own copy
* of the string.
*
* Note: The tags object will not do anything to prevent duplicate
* tags being stored, so the caller really shouldn't pass
* duplicates. */
void
_notmuch_tags_add_tag (notmuch_tags_t *tags, const char *tag)
{
tags->tags = g_list_prepend (tags->tags, talloc_strdup (tags, tag));
tags->sorted = 0;
}
/* Prepare 'tag' for iteration.
*
* The internal creator of 'tags' should call this function before
* returning 'tags' to the user to call the public functions such as
* notmuch_tags_has_more, notmuch_tags_get, and notmuch_tags_advance. */
void
_notmuch_tags_prepare_iterator (notmuch_tags_t *tags)
{
if (! tags->sorted)
tags->tags = g_list_sort (tags->tags, (GCompareFunc) strcmp);
tags->sorted = 1;
tags->iterator = tags->tags;
}
notmuch_bool_t
notmuch_tags_has_more (notmuch_tags_t *tags)
{
return tags->iterator != NULL;
}
const char *
notmuch_tags_get (notmuch_tags_t *tags)
{
if (tags->iterator == NULL)
return NULL;
return (char *) tags->iterator->data;
}
void
notmuch_tags_advance (notmuch_tags_t *tags)
{
if (tags->iterator == NULL)
return;
tags->iterator = tags->iterator->next;
}
void
notmuch_tags_destroy (notmuch_tags_t *tags)
{
talloc_free (tags);
}
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