From: Ihor Radchenko <yantar92@posteo.net>
To: David Rogers <davidandrewrogers@gmail.com>
Cc: Org-mode list <emacs-orgmode@gnu.org>
Subject: Re: Diary sexp and comparing dates, agenda
Date: Fri, 12 Jan 2024 23:00:33 +0000 [thread overview]
Message-ID: <87jzoenomm.fsf@localhost> (raw)
In-Reply-To: <rzhwmsfhz4i.fsf@gmail.com>
David Rogers <davidandrewrogers@gmail.com> writes:
> * Example 1
> <%%(= 245 (mf-days-from-easter))>
>
> because "mf-days-from-easter" is defined in my init file, along
> with the definition of Easter itself. This does what it looks like
> it should do; this year, Example 1 is shown on December 1.
>
> And I can do
>
> * Example 2
> <%%(and (diary-float 1 0 5 7) (<= (mf-days-from-easter) -56))>
>
> to say "five Sundays after January 6th, but only if Easter is
> still 8 weeks away or more".
>
> But Example 1 isn't quite finished, because that date is too close
> to Christmas. I can easily show a diary sexp defining when "too
> close to Christmas" is:
>
> <%%(diary-float 12 0 -4 24)>
>
> So I want to combine these ideas, to say "Show Example 1 in the
> agenda 245 days after Easter each year, but only if it's earlier
> than the fourth Sunday before Christmas".
You don't need diary-float - it returns true/false whether current DATE
fits the arguments.
Instead, you can make use of `calendar-nth-named-absday'.
For example,
<%%(and (= 245 (mf-days-from-easter))
(< (calendar-absolute-from-gregorian date)
(calendar-nth-named-absday -4 0 12 24)))>
Diary sexps are nothing but ordinary Elisp, with an extra twist that
during evaluation `date' variable is bound to current calendar date.
When they return nil, DATE does not match.
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
next prev parent reply other threads:[~2024-01-12 22:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-12 5:58 Diary sexp and comparing dates, agenda David Rogers
2024-01-12 17:01 ` Tory S. Anderson
2024-01-12 18:11 ` Ken Mankoff
2024-01-12 23:00 ` Ihor Radchenko [this message]
2024-01-13 5:41 ` David Rogers
2024-01-13 20:05 ` Ihor Radchenko
2024-01-13 23:44 ` David Rogers
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