[PATCH v4 07/11] lib: added interface notmuch_thread_get_flag_messages
Mark Walters
markwalters1009 at gmail.com
Thu Feb 2 14:27:36 PST 2012
On Thu, 02 Feb 2012 23:55:33 +0200, Jani Nikula <jani at nikula.org> wrote:
>
> Hi Mark -
>
> This is my first look at any version of the series; apologies if I'm
> clueless about some details... Please find some comments below.
>
> BR,
> Jani.
>
>
> On Thu, 2 Feb 2012 17:43:35 +0000, Mark Walters <markwalters1009 at gmail.com> wrote:
> > The function is
> > notmuch_thread_get_flag_messages
> > (notmuch_thread_t *thread, unsigned int flag_mask, unsigned int flags)
> >
> > and returns the number of messages with the specified flags on flag_mask.
>
> Is the purpose of this function to get the count of messages that have
> certain flags set, certain flags not set, and certain flags don't-care?
Yes: I was trying to follow Austin's suggestion from
id:"20120124025331.GZ16740 at mit.edu" (although stupidly I didn't
follow his suggestion of a function name).
> At the very least, I think the documentation of the function should be
> greatly improved.
>
> I think the name of the function should be notmuch_thread_count_messages
> which is like notmuch_query_count_messages, but for messages in threads
> (and with some extra restrictions).
Yes I like your name; before I change it do you (and others) prefer it
to Austin's suggestion of notmuch_thread_count_flags. Or we could even
be more verbose with something like
notmuch_thread_count_messages_with_flags
> > /* Message flags */
> > typedef enum _notmuch_message_flag {
> > - NOTMUCH_MESSAGE_FLAG_MATCH,
> > - NOTMUCH_MESSAGE_FLAG_EXCLUDED
> > + NOTMUCH_MESSAGE_FLAG_MATCH = (1<<0),
> > + NOTMUCH_MESSAGE_FLAG_EXCLUDED = (1<<1),
> > + NOTMUCH_MESSAGE_FLAG_MAX = (1<<2)
>
> How are these used by the current lib users at the moment? How will they
> break with this change?
The only existing flag is NOTMUCH_MESSAGE_FLAG_MATCH: that is currently
zero but in the current code that is the bit offset of the flag; in my
version it is the actual bit for the flag (otherwise I think flag masks
end up very ugly). I believe all callers use notmuch_message_set_flag
and notmuch_message_get_flag so they should not notice the difference.
> Please align the assignments.
Will do.
> > @@ -457,8 +452,8 @@ _notmuch_thread_create (void *ctx,
> > thread->message_hash = g_hash_table_new_full (g_str_hash, g_str_equal,
> > free, NULL);
> >
> > - thread->total_messages = 0;
> > - thread->matched_messages = 0;
> > + for (i = 0; i < NOTMUCH_MESSAGE_FLAG_MAX; i++)
> > + thread->flag_count_messages[i] = 0;
>
> memset (thread->flag_count_messages, 0, sizeof(thread->flag_count_messages));
Will do
> > thread->oldest = 0;
> > thread->newest = 0;
> >
> > @@ -473,6 +468,7 @@ _notmuch_thread_create (void *ctx,
> > notmuch_messages_move_to_next (messages))
> > {
> > unsigned int doc_id;
> > + unsigned int message_flags;
> >
> > message = notmuch_messages_get (messages);
> > doc_id = _notmuch_message_get_doc_id (message);
> > @@ -485,6 +481,10 @@ _notmuch_thread_create (void *ctx,
> > _notmuch_doc_id_set_remove (match_set, doc_id);
> > _thread_add_matched_message (thread, message, sort);
> > }
> > + message_flags =
> > + notmuch_message_get_flag (message, NOTMUCH_MESSAGE_FLAG_MATCH) |
> > + notmuch_message_get_flag (message, NOTMUCH_MESSAGE_FLAG_EXCLUDED);
> > + thread->flag_count_messages[message_flags]++;
>
> The first impression of using a set of flags as index is that there's a
> bug. But this is to keep count of messages with certain flag sets rather
> than total for each flag, right? I think this needs more comments, more
> documentation. Already naming the field flag_set_message_counts or
> similar would help greatly.
I will try and document it better: on first reading I parsed your name
as flag set (as verb) message counts whereas I assume you mean "flag
set" as a noun! I will see if I can come up with something though.
> > _notmuch_message_close (message);
> > }
> > @@ -511,15 +511,28 @@ notmuch_thread_get_thread_id (notmuch_thread_t *thread)
> > }
> >
> > int
> > +notmuch_thread_get_flag_messages (notmuch_thread_t *thread, unsigned int flag_mask, unsigned int flags)
> > +{
> > + unsigned int i;
> > + int count = 0;
> > + for (i = 0; i < NOTMUCH_MESSAGE_FLAG_MAX; i++)
>
> ARRAY_SIZE (thread->flag_count_messages)
ok
>
> > + if ((i & flag_mask) == (flags & flag_mask))
> > + count += thread->flag_count_messages[i];
> > + return count;
> > +}
>
> I wonder if the same could be accomplished by using two flag mask
> parameters, include_flag_mask and exclude_flag_mask. I'm thinking of the
> usage, would it be easier to use:
>
> notmuch_query_count_messages (thread, NOTMUCH_MESSAGE_FLAG_MATCH, NOTMUCH_MESSAGE_FLAG_EXCLUDED);
>
> to get number of messages that have MATCH but not EXCLUDED? 0 as
> include_flag_mask could still be special for "all", and you could use:
>
> notmuch_query_count_messages (thread, 0, NOTMUCH_MESSAGE_FLAG_EXCLUDED);
>
> Note the name change according to my earlier suggestion. It might be
> wise to not export the function before the API is chrystal clear if
> there is no pressing need to do so.
(I assume you mean notmuch_thread_count_messages.) Can I just check this
would return the number of messages which have all the flags in
include_flag_mask and none of the flags in exclude_flag_mask?
I completely agree about leaving it until we have the API well worked
out. I wrote it in response to Austin's suggestion and then it looked
like it would useful in my attempts to remove the
notmuch_query_set_omit_excluded_messages API. However, those attempts
failed so it doesn't have any users yet.
Best wishes
Mark
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