Re: dynamically calculated timestamps?

From: Matt Price <moptop99@gmail.com>
To: emacs-orgmode@gnu.org
Subject: Re: dynamically calculated timestamps?
Date: Thu, 2 Sep 2010 13:31:38 -0400	[thread overview]
Message-ID: <AANLkTi=VNN5XU_7DjAUKVoRWPAOohNn8zDRFuGAZW24F@mail.gmail.com> (raw)
In-Reply-To: <AANLkTikrHqCUd=1WAq1rdXShK0GGY_jYFF9FBxS+kV4h@mail.gmail.com>

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On Thu, Sep 2, 2010 at 1:15 PM, Matt Price <moptop99@gmail.com> wrote:

>
> > (there are subheadings and text in between). While i'm planning I like
>> > to move the headings around quite a bit, but it would be nice, while
>> > I'm doing that, to still know what date the class meeting will take
>> > place on. So I would like to do something like this:
>> > * Outline: Semester 1
>> > ** Introduction: What is History For? <2010-09-16 Thu>
>> > ** History and the Public Sphere <<last timestamp+7 days >>
>> > ** Recursive Publics<<last timestamp+7 days >>
>> >
>>
>> "last timestamp" here refers to the date in previous item or last date
>> class was held?
>>
>> to the previous timestamp, sorry.
>
>
>>  > So essentially, have something like a spreadsheet formula embedded in
>> the
>> > timestamp.  Does anyone have any ideas how I might jerryrig something
>> like
>> > that? It would certainly be helpful to me.
>>
>> The reference to spreadsheet like formula suggests that you want the
>> date from previous item to be used to calculate the date for current
>> item and a change in the former should cause an appropriate change on
>> the latter. org-depend.el (in contrib/lisp) can be used to define the
>> relationships but I don't know how you could link dates that way.
>>
>> Thanks for the pointer, but that file remains a little opaque to me! maybe
> someone will explain itto me.  Thanks much for the help though.
>

i've just been htinking about it and it seems this ought to be pretty
simple:
- find the last timestamp
- read its value
- go back to point
- update timestamp of current headin

so, in broken syntactically flawed pseudocode:
(defun change-stamp
(save-excursion (goto-last-timestamp)
(save-timestamp-value))
(set-timestamp-to-saved))
something like that.  but of course those functions would have to be
written.  any ideas?

 thanks,
matt

> .
> matt
>

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