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ef3ab5781a
The previous functions were always called together, so we might as well just have one function for this. Also, the reset() name was poor, and prepare_iterator() is much more descriptive.
116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/* tags.c - Iterator for tags returned from message or thread
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*
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* Copyright © 2009 Carl Worth
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see http://www.gnu.org/licenses/ .
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*
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* Author: Carl Worth <cworth@cworth.org>
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*/
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#include "notmuch-private.h"
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#include <glib.h> /* GList */
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struct _notmuch_tags {
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int sorted;
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GList *tags;
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GList *iterator;
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};
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/* XXX: Should write some talloc-friendly list to avoid the need for
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* this. */
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static int
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_notmuch_tags_destructor (notmuch_tags_t *tags)
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{
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g_list_free (tags->tags);
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return 0;
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}
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/* Create a new notmuch_tags_t object, with 'ctx' as its talloc owner.
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*
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* This function can return NULL in case of out-of-memory.
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*/
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notmuch_tags_t *
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_notmuch_tags_create (void *ctx)
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{
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notmuch_tags_t *tags;
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tags = talloc (ctx, notmuch_tags_t);
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if (unlikely (tags == NULL))
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return NULL;
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talloc_set_destructor (tags, _notmuch_tags_destructor);
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tags->sorted = 1;
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tags->tags = NULL;
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tags->iterator = NULL;
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return tags;
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}
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/* Add a new tag to 'tags'. The tags object will create its own copy
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* of the string.
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*
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* Note: The tags object will not do anything to prevent duplicate
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* tags being stored, so the caller really shouldn't pass
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* duplicates. */
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void
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_notmuch_tags_add_tag (notmuch_tags_t *tags, const char *tag)
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{
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tags->tags = g_list_prepend (tags->tags, talloc_strdup (tags, tag));
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tags->sorted = 0;
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}
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/* Prepare 'tag' for iteration.
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*
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* The internal creator of 'tags' should call this function before
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* returning 'tags' to the user to call the public functions such as
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* notmuch_tags_has_more, notmuch_tags_get, and notmuch_tags_advance. */
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void
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_notmuch_tags_prepare_iterator (notmuch_tags_t *tags)
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{
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if (! tags->sorted)
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tags->tags = g_list_sort (tags->tags, (GCompareFunc) strcmp);
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tags->sorted = 1;
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tags->iterator = tags->tags;
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}
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notmuch_bool_t
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notmuch_tags_has_more (notmuch_tags_t *tags)
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{
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return tags->iterator != NULL;
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}
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const char *
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notmuch_tags_get (notmuch_tags_t *tags)
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{
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if (tags->iterator)
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return (char *) tags->iterator->data;
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else
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return NULL;
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}
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void
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notmuch_tags_advance (notmuch_tags_t *tags)
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{
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tags->iterator = tags->iterator->next;
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}
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void
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notmuch_tags_destroy (notmuch_tags_t *tags)
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{
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talloc_free (tags);
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}
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