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6519aff957
Using the address of a static char* was clever, but really unnecessary. An empty string is much less magic, and even easier to understand as the way to query everything from the database.
143 lines
3.5 KiB
C++
143 lines
3.5 KiB
C++
/* query.cc - Support for searching a notmuch database
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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 "database-private.h"
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#include <xapian.h>
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struct _notmuch_query {
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notmuch_database_t *notmuch;
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const char *query_string;
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notmuch_sort_t sort;
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};
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struct _notmuch_results {
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notmuch_database_t *notmuch;
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Xapian::PostingIterator iterator;
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Xapian::PostingIterator iterator_end;
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};
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notmuch_query_t *
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notmuch_query_create (notmuch_database_t *notmuch,
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const char *query_string)
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{
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notmuch_query_t *query;
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query = talloc (NULL, notmuch_query_t);
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if (unlikely (query == NULL))
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return NULL;
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query->notmuch = notmuch;
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query->query_string = talloc_strdup (query, query_string);
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query->sort = NOTMUCH_SORT_DATE_OLDEST_FIRST;
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return query;
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}
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void
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notmuch_query_set_sort (notmuch_query_t *query, notmuch_sort_t sort)
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{
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query->sort = sort;
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}
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/* We end up having to call the destructors explicitly because we had
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* to use "placement new" in order to initialize C++ objects within a
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* block that we allocated with talloc. So C++ is making talloc
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* slightly less simple to use, (we wouldn't need
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* talloc_set_destructor at all otherwise).
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*/
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static int
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_notmuch_results_destructor (notmuch_results_t *results)
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{
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results->iterator.~PostingIterator ();
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results->iterator_end.~PostingIterator ();
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return 0;
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}
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notmuch_results_t *
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notmuch_query_search (notmuch_query_t *query)
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{
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notmuch_results_t *results;
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results = talloc (query, notmuch_results_t);
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if (unlikely (results == NULL))
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return NULL;
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try {
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if (strlen (query->query_string)) {
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fprintf (stderr, "Error: Arbitrary search strings are not supported yet. Come back soon!\n");
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exit (1);
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}
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results->notmuch = query->notmuch;
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new (&results->iterator) Xapian::PostingIterator ();
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new (&results->iterator_end) Xapian::PostingIterator ();
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talloc_set_destructor (results, _notmuch_results_destructor);
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results->iterator = query->notmuch->xapian_db->postlist_begin ("");
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results->iterator_end = query->notmuch->xapian_db->postlist_end ("");
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} catch (const Xapian::Error &error) {
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fprintf (stderr, "A Xapian exception occurred: %s\n",
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error.get_msg().c_str());
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}
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return results;
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}
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void
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notmuch_query_destroy (notmuch_query_t *query)
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{
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talloc_free (query);
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}
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notmuch_bool_t
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notmuch_results_has_more (notmuch_results_t *results)
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{
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return (results->iterator != results->iterator_end);
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}
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notmuch_message_t *
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notmuch_results_get (notmuch_results_t *results)
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{
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Xapian::docid doc_id;
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doc_id = *results->iterator;
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return _notmuch_message_create (results,
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results->notmuch, doc_id);
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}
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void
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notmuch_results_advance (notmuch_results_t *results)
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{
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results->iterator++;
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}
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void
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notmuch_results_destroy (notmuch_results_t *results)
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{
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talloc_free (results);
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}
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