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lib: New function to collect tags from a list of messages.

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This patch adds a new function that can be used to collect a list of
unique tags from a list of messages. 'notmuch search-tags' uses the
function to get a list of tags from messages matching a search-term,
but it has the potential to be used elsewhere so we put it in the lib.

Signed-off-by: Jan Janak <jan@ryngle.com>
This commit is contained in:
Jan Janak 2009-11-25 04:30:21 +01:00 committed by Carl Worth
parent 16eab4c87d
commit 523a6f67ec
2 changed files with 55 additions and 0 deletions
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40
lib/messages.c
View file

@ -20,6 +20,8 @@
#include "notmuch-private.h"
#include <glib.h>
/* Create a new notmuch_message_list_t object, with 'ctx' as its
* talloc owner.
*
@ -140,3 +142,41 @@ notmuch_messages_destroy (notmuch_messages_t *messages)
{
talloc_free (messages);
}
notmuch_tags_t *
notmuch_messages_collect_tags (notmuch_messages_t *messages)
{
notmuch_tags_t *tags, *msg_tags;
notmuch_message_t *msg;
GHashTable *htable;
GList *keys, *l;
const char *tag;
tags = _notmuch_tags_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_advance (msg_tags);
}
notmuch_tags_destroy (msg_tags);
notmuch_message_destroy (msg);
notmuch_messages_advance (messages);
}
keys = g_hash_table_get_keys (htable);
for (l = keys; l; l = l->next) {
_notmuch_tags_add_tag (tags, (char *)l->data);
}
g_list_free (keys);
g_hash_table_destroy (htable);
_notmuch_tags_prepare_iterator (tags);
return tags;
}

15
lib/notmuch.h
View file

@ -635,6 +635,21 @@ notmuch_messages_advance (notmuch_messages_t *messages);
void
notmuch_messages_destroy (notmuch_messages_t *messages);
/* Return a list of tags from all messages.
*
* The resulting list is guaranteed not to contain duplicated tags.
*
* WARNING: You can no longer iterate over messages after calling this
* function, because the iterator will point at the end of the list.
* We do not have a function to reset the iterator yet and the only
* way how you can iterate over the list again is to recreate the
* message list.
*
* The function returns NULL on error.
*/
notmuch_tags_t *
notmuch_messages_collect_tags (notmuch_messages_t *messages);
/* Get the message ID of 'message'.
*
* The returned string belongs to 'message' and as such, should not be