support range durations

[Guido Stevens]

Hi all,

I'm new to this list and joined in order to submit the attached tiny patch.

As per https://orgmode.org/manual/Column-attributes.html I'm using range 
durations to express effort estimations. Those get summarized nicely in 
column views, using the {est+} summarizer. But when I access an agenda 
view that encounters a task that has such a range duration directly set, 
the agenda chokes with an error message:

        org-duration-to-minutes: Invalid duration format: "1d-2d"

Attached patch fixes that error, by

1. Just before throwing that error, checking if this is potentially a 
range duration, of two durations separated by a "-"

2. If so, split the range into two separate <low> and <high> durations, 
convert each of those to minutes, and take the average.

The patch doesn't use a fancy regexp. Instead, it recurses into 
org-duration-to-minutes and reapplies all sanity checks on the 
constituent low/high durations. If you have two valid durations 
connected by a dash (and optionally whitespace), that's a valid range 
duration, and it will be expressed as a float. If not, you'll hit the 
error fallback directly below.

Applying this patch fixes my agenda view when using range durations. 
Since the actual code change is just 2 lines, I opted to forego the FSF 
copyright assignment caroussel by marking this a TINYCHANGE.

Patch is based off e269942a353965dd8bdad57741adc9c53116a08a which is my 
current Doom Emacs checkout of 
https://github.com/emacs-straight/org-mode. I hope that's fine.

Kind regards, Guido.
--
    Guido Stevens    |   Cosent   |     https://cosent.nl

    s o c i a l   k n o w l e d g e   t e c h n o l o g y

0001-lisp-org-duration.el-support-range-durations.patch
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