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   1 /* query.cc - Support for searching a notmuch database
   2  *
   3  * Copyright © 2009 Carl Worth
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see http://www.gnu.org/licenses/ .
  17  *
  18  * Author: Carl Worth <cworth@cworth.org>
  19  */
  20
  21 #include "notmuch-private.h"
  22 #include "database-private.h"
  23
  24 #include <glib.h> /* GHashTable, GPtrArray */
  25
  26 #include <xapian.h>
  27
  28 struct _notmuch_query {
  29     notmuch_database_t *notmuch;
  30     const char *query_string;
  31     notmuch_sort_t sort;
  32 };
  33
  34 struct _notmuch_messages {
  35     notmuch_database_t *notmuch;
  36     Xapian::MSetIterator iterator;
  37     Xapian::MSetIterator iterator_end;
  38 };
  39
  40 struct _notmuch_threads {
  41     notmuch_database_t *notmuch;
  42     GPtrArray *threads;
  43     unsigned int index;
  44 };
  45
  46 notmuch_query_t *
  47 notmuch_query_create (notmuch_database_t *notmuch,
  48                       const char *query_string)
  49 {
  50     notmuch_query_t *query;
  51
  52 #ifdef DEBUG_QUERY
  53     fprintf (stderr, "Query string is:\n%s\n", query_string);
  54 #endif
  55
  56     query = talloc (NULL, notmuch_query_t);
  57     if (unlikely (query == NULL))
  58         return NULL;
  59
  60     query->notmuch = notmuch;
  61
  62     query->query_string = talloc_strdup (query, query_string);
  63
  64     query->sort = NOTMUCH_SORT_DATE;
  65
  66     return query;
  67 }
  68
  69 void
  70 notmuch_query_set_sort (notmuch_query_t *query, notmuch_sort_t sort)
  71 {
  72     query->sort = sort;
  73 }
  74
  75 /* We end up having to call the destructors explicitly because we had
  76  * to use "placement new" in order to initialize C++ objects within a
  77  * block that we allocated with talloc. So C++ is making talloc
  78  * slightly less simple to use, (we wouldn't need
  79  * talloc_set_destructor at all otherwise).
  80  */
  81 static int
  82 _notmuch_messages_destructor (notmuch_messages_t *messages)
  83 {
  84     messages->iterator.~MSetIterator ();
  85     messages->iterator_end.~MSetIterator ();
  86
  87     return 0;
  88 }
  89
  90 notmuch_messages_t *
  91 notmuch_query_search_messages (notmuch_query_t *query,
  92                                int first,
  93                                int max_messages)
  94 {
  95     notmuch_database_t *notmuch = query->notmuch;
  96     const char *query_string = query->query_string;
  97     notmuch_messages_t *messages;
  98
  99     messages = talloc (query, notmuch_messages_t);
 100     if (unlikely (messages == NULL))
 101         return NULL;
 102
 103     try {
 104         Xapian::Enquire enquire (*notmuch->xapian_db);
 105         Xapian::Query mail_query (talloc_asprintf (query, "%s%s",
 106                                                    _find_prefix ("type"),
 107                                                    "mail"));
 108         Xapian::Query string_query, final_query;
 109         Xapian::MSet mset;
 110         unsigned int flags = (Xapian::QueryParser::FLAG_BOOLEAN |
 111                               Xapian::QueryParser::FLAG_PHRASE |
 112                               Xapian::QueryParser::FLAG_LOVEHATE |
 113                               Xapian::QueryParser::FLAG_BOOLEAN_ANY_CASE |
 114                               Xapian::QueryParser::FLAG_WILDCARD);
 115
 116         if (strcmp (query_string, "") == 0) {
 117             final_query = mail_query;
 118         } else {
 119             string_query = notmuch->query_parser->
 120                 parse_query (query_string, flags);
 121             final_query = Xapian::Query (Xapian::Query::OP_AND,
 122                                          mail_query, string_query);
 123         }
 124
 125         switch (query->sort) {
 126         case NOTMUCH_SORT_DATE:
 127             enquire.set_sort_by_value (NOTMUCH_VALUE_TIMESTAMP, FALSE);
 128             break;
 129         case NOTMUCH_SORT_DATE_REVERSE:
 130             enquire.set_sort_by_value (NOTMUCH_VALUE_TIMESTAMP, TRUE);
 131             break;
 132         case NOTMUCH_SORT_MESSAGE_ID:
 133             enquire.set_sort_by_value (NOTMUCH_VALUE_MESSAGE_ID, FALSE);
 134             break;
 135         }
 136
 137 #if DEBUG_QUERY
 138         fprintf (stderr, "Final query is:\n%s\n", final_query.get_description().c_str());
 139 #endif
 140
 141         enquire.set_query (final_query);
 142
 143         if (max_messages == -1)
 144             max_messages = notmuch->xapian_db->get_doccount ();
 145         mset = enquire.get_mset (first, max_messages);
 146
 147         messages->notmuch = notmuch;
 148
 149         new (&messages->iterator) Xapian::MSetIterator ();
 150         new (&messages->iterator_end) Xapian::MSetIterator ();
 151
 152         talloc_set_destructor (messages, _notmuch_messages_destructor);
 153
 154         messages->iterator = mset.begin ();
 155         messages->iterator_end = mset.end ();
 156
 157     } catch (const Xapian::Error &error) {
 158         fprintf (stderr, "A Xapian exception occurred: %s\n",
 159                  error.get_msg().c_str());
 160     }
 161
 162     return messages;
 163 }
 164
 165 /* Glib objects force use to use a talloc destructor as well, (but not
 166  * nearly as ugly as the for messages due to C++ objects). At
 167  * this point, I'd really like to have some talloc-friendly
 168  * equivalents for the few pieces of glib that I'm using. */
 169 static int
 170 _notmuch_threads_destructor (notmuch_threads_t *threads)
 171 {
 172     g_ptr_array_free (threads->threads, TRUE);
 173
 174     return 0;
 175 }
 176
 177 notmuch_threads_t *
 178 notmuch_query_search_threads (notmuch_query_t *query,
 179                               int first,
 180                               int max_threads)
 181 {
 182     notmuch_threads_t *threads;
 183     notmuch_thread_t *thread;
 184     const char *thread_id;
 185     notmuch_messages_t *messages;
 186     notmuch_message_t *message;
 187     GHashTable *seen;
 188     int messages_seen = 0, threads_seen = 0;
 189
 190     threads = talloc (query, notmuch_threads_t);
 191     if (threads == NULL)
 192         return NULL;
 193
 194     threads->notmuch = query->notmuch;
 195     threads->threads = g_ptr_array_new ();
 196     threads->index = 0;
 197
 198     talloc_set_destructor (threads, _notmuch_threads_destructor);
 199
 200     seen = g_hash_table_new_full (g_str_hash, g_str_equal,
 201                                   free, NULL);
 202
 203     while (max_threads < 0 || threads_seen < first + max_threads)
 204     {
 205         int messages_seen_previously = messages_seen;
 206
 207         for (messages = notmuch_query_search_messages (query,
 208                                                        messages_seen,
 209                                                        max_threads);
 210              notmuch_messages_has_more (messages);
 211              notmuch_messages_advance (messages))
 212         {
 213             message = notmuch_messages_get (messages);
 214
 215             thread_id = notmuch_message_get_thread_id (message);
 216
 217             if (! g_hash_table_lookup_extended (seen,
 218                                                 thread_id, NULL,
 219                                                 (void **) &thread))
 220             {
 221                 if (threads_seen >= first) {
 222                     thread = _notmuch_thread_create (query, query->notmuch,
 223                                                      thread_id,
 224                                                      query->query_string);
 225                     g_ptr_array_add (threads->threads, thread);
 226                 } else {
 227                     thread = NULL;
 228                 }
 229
 230                 g_hash_table_insert (seen, xstrdup (thread_id), thread);
 231
 232                 threads_seen++;
 233             }
 234
 235             notmuch_message_destroy (message);
 236
 237             messages_seen++;
 238
 239             if (max_threads >= 0 && threads_seen >= first + max_threads)
 240                 break;
 241         }
 242
 243         /* Stop if we're not seeing any more messages. */
 244         if (messages_seen == messages_seen_previously)
 245             break;
 246     }
 247
 248     g_hash_table_unref (seen);
 249
 250     return threads;
 251 }
 252
 253 void
 254 notmuch_query_destroy (notmuch_query_t *query)
 255 {
 256     talloc_free (query);
 257 }
 258
 259 notmuch_bool_t
 260 notmuch_messages_has_more (notmuch_messages_t *messages)
 261 {
 262     return (messages->iterator != messages->iterator_end);
 263 }
 264
 265 notmuch_message_t *
 266 notmuch_messages_get (notmuch_messages_t *messages)
 267 {
 268     notmuch_message_t *message;
 269     Xapian::docid doc_id;
 270     notmuch_private_status_t status;
 271
 272     if (! notmuch_messages_has_more (messages))
 273         return NULL;
 274
 275     doc_id = *messages->iterator;
 276
 277     message = _notmuch_message_create (messages,
 278                                        messages->notmuch, doc_id,
 279                                        &status);
 280
 281     if (message == NULL &&
 282         status == NOTMUCH_PRIVATE_STATUS_NO_DOCUMENT_FOUND)
 283     {
 284         INTERNAL_ERROR ("a messages iterator contains a non-existent document ID.\n");
 285     }
 286
 287     return message;
 288 }
 289
 290 void
 291 notmuch_messages_advance (notmuch_messages_t *messages)
 292 {
 293     messages->iterator++;
 294 }
 295
 296 void
 297 notmuch_messages_destroy (notmuch_messages_t *messages)
 298 {
 299     talloc_free (messages);
 300 }
 301
 302 notmuch_bool_t
 303 notmuch_threads_has_more (notmuch_threads_t *threads)
 304 {
 305     return (threads->index < threads->threads->len);
 306 }
 307
 308 notmuch_thread_t *
 309 notmuch_threads_get (notmuch_threads_t *threads)
 310 {
 311     if (! notmuch_threads_has_more (threads))
 312         return NULL;
 313
 314     return (notmuch_thread_t *) g_ptr_array_index (threads->threads,
 315                                                    threads->index);
 316 }
 317
 318 void
 319 notmuch_threads_advance (notmuch_threads_t *threads)
 320 {
 321     threads->index++;
 322 }
 323
 324 void
 325 notmuch_threads_destroy (notmuch_threads_t *threads)
 326 {
 327     talloc_free (threads);
 328 }