From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Hinsen <konrad.hinsen@fastmail.net>
Subject: Re: org google weather
Date: Sun, 6 Mar 2011 11:33:34 +0100
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To: nicholas.dokos@hp.com
Cc: Bastien <bzg@altern.org>, Org Mode Mailing List <emacs-orgmode@gnu.org>

On 6 Mar 2011, at 00:51, Nick Dokos wrote:

> Konrad Hinsen <konrad.hinsen@fastmail.net> wrote:
>
>> What keeps me from writing that function right now is that I don't
>> know the internals of org-mode well enough to know how to check for a
>> propery or tag. I expect to spend an hour reading source code, and
>> that's for another day :-)
>
> Before diving into the code, check out Appendix A, "Hacking", and in
> particular section A.9, "Using the property API", in the Org manual.

Thanks for the useful hint! I am not used to code that comes with a  
hacker's manual.

BTW, I found a very simple solution to my original problem of having  
sunrise and sunset only in the day view:

%%(when (eq span 'day) (diary-sunrise))
%%(when (eq span 'day) (diary-sunset))

Fortunately, because apparently org-agenda-skip-function is not called  
for diary-style entries. But I'll continue exploring that approach for  
other types of entries.

Konrad.