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properties: add notmuch_message_count_properties

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The user can already do this manually, of course, but (a) it's nice to
have a convenience function, and (b) exposing this interface means
that someone more clever with a _notmuch_string_map_t than i am can
write a more efficient version if they like, and it will just
accelerate the users of the convenience function.
This commit is contained in:
Daniel Kahn Gillmor 2018-05-11 02:57:53 -04:00 committed by David Bremner
parent 4a6371f1d8
commit 499bb78178
2 changed files with 41 additions and 0 deletions
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25
lib/message-property.cc
View file

@ -36,6 +36,31 @@ notmuch_message_get_property (notmuch_message_t *message, const char *key, const
return NOTMUCH_STATUS_SUCCESS;
}
notmuch_status_t
notmuch_message_count_properties (notmuch_message_t *message, const char *key, unsigned int *count)
{
if (! count || ! key || ! message)
return NOTMUCH_STATUS_NULL_POINTER;
notmuch_string_map_t *map;
map = _notmuch_message_property_map (message);
if (! map)
return NOTMUCH_STATUS_NULL_POINTER;
notmuch_string_map_iterator_t *matcher = _notmuch_string_map_iterator_create (map, key, true);
if (! matcher)
return NOTMUCH_STATUS_OUT_OF_MEMORY;
*count = 0;
while (_notmuch_string_map_iterator_valid (matcher)) {
(*count)++;
_notmuch_string_map_iterator_move_to_next (matcher);
}
_notmuch_string_map_iterator_destroy (matcher);
return NOTMUCH_STATUS_SUCCESS;
}
static notmuch_status_t
_notmuch_message_modify_property (notmuch_message_t *message, const char *key, const char *value,
bool delete_it)

16
lib/notmuch.h
View file

@ -1890,6 +1890,22 @@ typedef struct _notmuch_string_map_iterator notmuch_message_properties_t;
notmuch_message_properties_t *
notmuch_message_get_properties (notmuch_message_t *message, const char *key, notmuch_bool_t exact);
/**
* Return the number of properties named "key" belonging to the specific message.
*
* @param[in] message The message to examine
* @param[in] key key to count
* @param[out] count The number of matching properties associated with this message.
*
* @returns
*
* NOTMUCH_STATUS_SUCCESS: successful count, possibly some other error.
*
* @since libnotmuch 5.2 (notmuch 0.27)
*/
notmuch_status_t
notmuch_message_count_properties (notmuch_message_t *message, const char *key, unsigned int *count);
/**
* Is the given *properties* iterator pointing at a valid (key,value)
* pair.