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Re: negative values for EFFORT result in error when switching to column

From: Heiko Schmidt
Subject: Re: negative values for EFFORT result in error when switching to column view
Date: Wed, 8 Apr 2020 17:18:07 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 06.04.20 18:13, Nicolas Goaziou wrote:
Heiko Schmidt <address@hidden> writes:

This is exactly the reason why I'd love to have negative values for
the durations. It would open the possibility of doing something like
"accounting" of time.
I think you can do accounting of time without introducing negative
duration. Basic accounting implies having two categories. You expect
them to be "positive" and "negative", but it could also be "positive in
property A" and "positive in property B".

I'm working with self defined duration units and it would be of great
value to be able to calculate the balance for planned and done work
time. I don't use clocking.

What'd be wrong about having -0:30 h, -30 min, -2.5 h, -3 d or -3 m?
It'd be an addition no change so there would hoefully be no

Maybe even 3m -3d be or -3m 3d could be of use.
No incompatibility doesn't mean no cost. It adds code complexity. You
also have to maintain the feature later on, make sure it doesn't break
future code, etc.

Moreover, I'm not convinced about the general need for such a feature.
Of course, it is possible that I may be missing the point. Org folks may
want to chime in and correct me if I do.
Ifully agree - being not fluent in emacs lisp I'm currently exploring org-duration.el at a snail's pace ... which is really really expensive :-)
I think so. But I suggest to check if you cannot do otherwise (again,
I'm sure you can).

I thought about this matter for a longer time (months if not years, again and again before I asked the list). AFAIK it is not possible to execute calculations between property A and property B in column view by assigning to property C with orgmode on board features. Or did I miss such a feature?

As I'm using orgmode extensively since years I've created and dived into many rabbit holes by implementing sophisticated special solutions which I later threw away for the win of simplicity. By now I just use basic features and one I'm really missing are these negative durations.

Maybe I can do some progress with org-duration.el on my own.

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