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/* messages.c - Iterator for a set of messages
*
* 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>
/* Create a new notmuch_message_list_t object, with 'ctx' as its
* talloc owner.
*
* This function can return NULL in case of out-of-memory.
*/
notmuch_message_list_t *
_notmuch_message_list_create (const void *ctx)
{
notmuch_message_list_t *list;
list = talloc (ctx, notmuch_message_list_t);
if (unlikely (list == NULL))
return NULL;
list->head = NULL;
list->tail = &list->head;
return list;
}
/* Append 'message' to the end of 'list'. */
void
_notmuch_message_list_add_message (notmuch_message_list_t *list,
notmuch_message_t *message)
{
notmuch_message_node_t *node = talloc (list, notmuch_message_node_t);
node->message = message;
node->next = NULL;
*(list->tail) = node;
list->tail = &node->next;
}
notmuch_messages_t *
_notmuch_messages_create (notmuch_message_list_t *list)
{
notmuch_messages_t *messages;
if (list->head == NULL)
return NULL;
messages = talloc (list, notmuch_messages_t);
if (unlikely (messages == NULL))
return NULL;
messages->is_of_list_type = TRUE;
messages->iterator = list->head;
return messages;
}
/* We're using the "is_of_type_list" to conditionally defer to the
* notmuch_mset_messages_t implementation of notmuch_messages_t in
* query.cc. It's ugly that that's over in query.cc, and it's ugly
* that we're not using a union here. Both of those uglies are due to
* C++:
*
* 1. I didn't want to force a C++ header file onto
* notmuch-private.h and suddenly subject all our code to a
* C++ compiler and its rules.
*
* 2. C++ won't allow me to put C++ objects, (with non-trivial
* constructors) into a union anyway. Even though I'd
* carefully control object construction with placement new
* anyway. *sigh*
*/
notmuch_bool_t
notmuch_messages_valid (notmuch_messages_t *messages)
{
if (messages == NULL)
return FALSE;
if (! messages->is_of_list_type)
return _notmuch_mset_messages_valid (messages);
return (messages->iterator != NULL);
}
notmuch_message_t *
notmuch_messages_get (notmuch_messages_t *messages)
{
if (! messages->is_of_list_type)
return _notmuch_mset_messages_get (messages);
if (messages->iterator == NULL)
return NULL;
return messages->iterator->message;
}
void
notmuch_messages_move_to_next (notmuch_messages_t *messages)
{
if (! messages->is_of_list_type) {
_notmuch_mset_messages_move_to_next (messages);
return;
}
if (messages->iterator == NULL)
return;
messages->iterator = messages->iterator->next;
}
void
notmuch_messages_destroy (notmuch_messages_t *messages)
{
talloc_free (messages);
}
notmuch_tags_t *
notmuch_messages_collect_tags (notmuch_messages_t *messages)
{
notmuch_string_list_t *tags;
notmuch_tags_t *msg_tags;
notmuch_message_t *msg;
GHashTable *htable;
GList *keys, *l;
const char *tag;
tags = _notmuch_string_list_create (messages);
if (tags == NULL) return NULL;
htable = g_hash_table_new_full (g_str_hash, g_str_equal, free, NULL);
while ((msg = notmuch_messages_get (messages))) {
msg_tags = notmuch_message_get_tags (msg);
while ((tag = notmuch_tags_get (msg_tags))) {
g_hash_table_insert (htable, xstrdup (tag), NULL);
notmuch_tags_move_to_next (msg_tags);
}
notmuch_tags_destroy (msg_tags);
notmuch_message_destroy (msg);
notmuch_messages_move_to_next (messages);
}
keys = g_hash_table_get_keys (htable);
for (l = keys; l; l = l->next) {
_notmuch_string_list_append (tags, (char *)l->data);
}
g_list_free (keys);
g_hash_table_destroy (htable);
_notmuch_string_list_sort (tags);
return _notmuch_tags_create (messages, tags);
}
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