notmuch/message.cc

/* message.cc - Results of message-based searches from a notmuch database
 *
 * 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 "database-private.h"

#include <xapian.h>

struct _notmuch_message {
    Xapian::Document doc;
};

struct _notmuch_tags {
    Xapian::TermIterator iterator;
    Xapian::TermIterator iterator_end;
};

/* We end up having to call the destructor explicitly because we had
 * to use "placement new" in order to initialize C++ objects within a
 * block that we allocated with talloc. So C++ is making talloc
 * slightly less simple to use, (we wouldn't need
 * talloc_set_destructor at all otherwise).
 */
static int
_notmuch_message_destructor (notmuch_message_t *message)
{
    message->doc.~Document ();

    return 0;
}

notmuch_message_t *
_notmuch_message_create (notmuch_results_t *owner,
			 notmuch_database_t *notmuch,
			 Xapian::docid doc_id)
{
    notmuch_message_t *message;

    message = talloc (owner, notmuch_message_t);
    if (unlikely (message == NULL))
	return NULL;

    new (&message->doc) Xapian::Document;

    talloc_set_destructor (message, _notmuch_message_destructor);

    message->doc = notmuch->xapian_db->get_document (doc_id);

    return message;
}

const char *
notmuch_message_get_message_id (notmuch_message_t *message)
{
    Xapian::TermIterator i;

    i = message->doc.termlist_begin ();
    i.skip_to ("Q");
    if (i != message->doc.termlist_end ())
	return talloc_strdup (message, (*i).c_str () + 1);
    else
	return NULL;
}

/* We end up having to call the destructors explicitly because we had
 * to use "placement new" in order to initialize C++ objects within a
 * block that we allocated with talloc. So C++ is making talloc
 * slightly less simple to use, (we wouldn't need
 * talloc_set_destructor at all otherwise).
 */
static int
_notmuch_tags_destructor (notmuch_tags_t *tags)
{
    tags->iterator.~TermIterator ();
    tags->iterator_end.~TermIterator ();

    return 0;
}

notmuch_tags_t *
notmuch_message_get_tags (notmuch_message_t *message)
{
    notmuch_tags_t *tags;

    tags = talloc (message, notmuch_tags_t);
    if (unlikely (tags == NULL))
	return NULL;

    new (&tags->iterator) Xapian::TermIterator;
    new (&tags->iterator_end) Xapian::TermIterator;

    talloc_set_destructor (tags, _notmuch_tags_destructor);

    tags->iterator = message->doc.termlist_begin ();
    tags->iterator.skip_to ("L");
    tags->iterator_end = message->doc.termlist_end ();

    return tags;
}

notmuch_bool_t
notmuch_tags_has_more (notmuch_tags_t *tags)
{
    std::string s;

    if (tags->iterator == tags->iterator_end)
	return FALSE;

    s = *tags->iterator;
    if (s.size () && s[0] == 'L')
	return TRUE;
    else
	return FALSE;
}

const char *
notmuch_tags_get (notmuch_tags_t *tags)
{
    return talloc_strdup (tags, (*tags->iterator).c_str () + 1);
}

void
notmuch_tags_advance (notmuch_tags_t *tags)
{
    tags->iterator++;
}