Backward scrolling notmuch_messages_t and notmuch_threads_t

Backward scrolling notmuch_messages_t and notmuch_threads_t

[Sergei Shilovsky]

Lets consider messages first.

As far as I get there is no straightforward
notmuch_messages_move_to_previous. One can usually implement such
behaviour with caching previous messages which is slightly inefficient
in memory consumption terms.

But we can sort messages either date asc or date desc.

Suppose, we're currently at the 1000th message in query "tag:whatever".

So if we need to go to the previous message we could do something like

    notmuch search --sort=oldest-first tag:whatever and \
        date:..<here is the date of the 1000th message>

This query's result should start with our 1000th message following its
previous message (in terms of the original request). So backward
scrolling with no cache looks to be at least possible.

Any idea of would that be fine? Is it possible to implement similar
thing at low-level?

-- 
С уважением,
Сергей Шиловский
Sergei Shilovsky

Re: Backward scrolling notmuch_messages_t and notmuch_threads_t

[Jani Nikula]

On Tue, 07 Oct 2014, Sergei Shilovsky <sshilovsky@gmail.com> wrote:
> Lets consider messages first.
>
> As far as I get there is no straightforward
> notmuch_messages_move_to_previous. One can usually implement such
> behaviour with caching previous messages which is slightly inefficient
> in memory consumption terms.
>
> But we can sort messages either date asc or date desc.
>
> Suppose, we're currently at the 1000th message in query "tag:whatever".
>
> So if we need to go to the previous message we could do something like
>
>     notmuch search --sort=oldest-first tag:whatever and \
>         date:..<here is the date of the 1000th message>
>
> This query's result should start with our 1000th message following its
> previous message (in terms of the original request). So backward
> scrolling with no cache looks to be at least possible.
>
> Any idea of would that be fine? Is it possible to implement similar
> thing at low-level?

See notmuch search --offset=N and --limit=N options.

BR,
Jani.


>
> -- 
> С уважением,
> Сергей Шиловский
> Sergei Shilovsky
> _______________________________________________
> notmuch mailing list
> notmuch@notmuchmail.org
> http://notmuchmail.org/mailman/listinfo/notmuch

Re: Backward scrolling notmuch_messages_t and notmuch_threads_t

[Sergei Shilovsky]

notmuch search --offset` simply skips the number of threads/messages.
This is not so fast if the offset is large.

 98     for (i = 0;
 99          notmuch_threads_valid (threads) && (limit < 0 || i <
offset + limit    );
100          notmuch_threads_move_to_next (threads), i++)
101     {
102         thread = notmuch_threads_get (threads);
103
104         if (i < offset) {
105             notmuch_thread_destroy (thread);
106             continue;
107         }

On Tue, Oct 7, 2014 at 3:16 PM, Jani Nikula <jani@nikula.org> wrote:
> On Tue, 07 Oct 2014, Sergei Shilovsky <sshilovsky@gmail.com> wrote:
>> Lets consider messages first.
>>
>> As far as I get there is no straightforward
>> notmuch_messages_move_to_previous. One can usually implement such
>> behaviour with caching previous messages which is slightly inefficient
>> in memory consumption terms.
>>
>> But we can sort messages either date asc or date desc.
>>
>> Suppose, we're currently at the 1000th message in query "tag:whatever".
>>
>> So if we need to go to the previous message we could do something like
>>
>>     notmuch search --sort=oldest-first tag:whatever and \
>>         date:..<here is the date of the 1000th message>
>>
>> This query's result should start with our 1000th message following its
>> previous message (in terms of the original request). So backward
>> scrolling with no cache looks to be at least possible.
>>
>> Any idea of would that be fine? Is it possible to implement similar
>> thing at low-level?
>
> See notmuch search --offset=N and --limit=N options.
>
> BR,
> Jani.
>
>
>>
>> --
>> С уважением,
>> Сергей Шиловский
>> Sergei Shilovsky
>> _______________________________________________
>> notmuch mailing list
>> notmuch@notmuchmail.org
>> http://notmuchmail.org/mailman/listinfo/notmuch



-- 
С уважением,
Сергей Шиловский
Sergei Shilovsky