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Re: [O] Hack: org-agenda-cache.el

From: Carsten Dominik
Subject: Re: [O] Hack: org-agenda-cache.el
Date: Mon, 16 Jan 2012 16:40:01 +0100

On 16.1.2012, at 13:18, Carsten Dominik wrote:

> Hi Max,
> this is a pretty good solution if the main issue with slow agenda
> is that it feels slow because you are often switching back and forth
> between different agenda buffers.  I like it, and I would vote for
> integration into Org-mode, not as a separate package, but directly,
> as an option.  If Bastien agrees, maybe you could make a patch which
> introduces this into the main code.
> Three comments:
> 1. I think there needs to be a command to remove all agenda buffers, to make 
> sure that everything is updated.  Maybe this could be "C-u r" or so, which 
> would rebuilt the current and remove all others.  This commands needs to make 
> sure that all markers are safely discarded - otherwise you will die the 
> marker death eventually.
> 2. I don't think that "-cache" is the best name choice for this, because this
> is not a caching mechanism.  It is a "multiple-agenda-buffers" thing.
> 3. One caveat for this is that maybe in some places, org-agenda-marker-table
> is modified while the agenda buffer is not current (I am not sure, I just 
> think this needs to be checked).  If so, one would need to pop to the 
> relevant agenda buffer to make the change.

Sorry, I am talking about `org-agenda-markers', and indeed, some care has to be 
taken here.  Basically, the function org-agenda-new-marker needs to be modified 
to take
a buffer as an argument, and then to push the new marker on the list of markers 
in that buffer.  Also, org-agenda-save-markers-in-region needs to be modified.

OK, this is a bit complicated, I am willing to help.  If you make a new patch 
that implements the multibuffer stuff in org-agenda, I will look at the marker 
issues and implement them.

- Carsten

> Just my 2c, of course.
> - Carsten
> On 15.1.2012, at 20:47, Max Mikhanosha wrote:
>> As my agenda files slowly grew over the years, the speed of generating
>> agenda had slowly deteriorated, finally hitting the point of me jdoing
>> something about it. (it got to around 5-7 seconds, which kind of
>> interrupts work-flow)
>> Attached file org-agenda-cache.el is a "quick fix" solution that I
>> developed for myself, its more of a request for discussion and not
>> intended as contribution yet.
>> Basic idea is:
>> 1. Multiple-agenda buffers can exist at the same time, having separate
>> tag filters and other such settings. This is accomplished by bunch of
>> org-agenda-* variables being made buffer-local.
>> 2. Custom agenda commands should bind `org-agenda-buffer-name' variable,
>> so that for example C-c a generates "*Agenda*" buffer and C-c t
>> generates "*Todo List*" buffer. 
>> 3. org-agenda checks if buffer with `org-agenda-buffer-name' exists
>> and if it does, it will show that buffer, rather then re-generating
>> it. To generate a fresh agenda, becomes C-c a r instead of C-c a
>> 4. org-agenda-quit buries the agenda buffer instead of killing it.
>> 5. All of the above shenanigans can be switched on and off by doing
>> M-x toggle-org-agenda-caching command, its off by default so you have
>> to turn it on after loading the file.
>> I had been using this setup for last few days, and it had really been
>> a blast, returning me to the times when I just started with org-mode,
>> and information had appeared in milliseconds rather then seconds.
>> <org-agenda-cache.el>

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