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Feature request: Radio button option for lists of checkboxes


From: Phil Sainty
Subject: Feature request: Radio button option for lists of checkboxes
Date: Sun, 3 Nov 2019 21:52:13 +1300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0

(Where "radio button" means that for a list of checkboxes, only
one may be selected at any given time -- selecting a different
checkbox automatically de-selects the previous one.)

Hello org-mode,

John Kitchin posted this blog a few years back:

http://kitchingroup.cheme.cmu.edu/blog/2015/10/05/A-checkbox-list-in-org-mode-with-one-value/

Subsequently Matúš Goljer adapted that code here:

https://github.com/Fuco1/org-radiobutton

I'm slow in following this up, but I contacted both John and Matúš
last year suggesting that this facility would make a nice addition
to the core org-mode features.  Both of them were happy for me to
submit the feature request, and both confirmed that they have
signed FSF copyright assignment, and so their code may be safely
adapted.  I have CC'd them both to this message.

Matúš's github project has subsequently merged a branch from one
other contributor, so I have pushed a fork which excludes that
particular change, as I am not aware of the copyright status for
that.  This FSF-safe fork is:

https://github.com/phil-s/org-radiobutton

(n.b. I've assigned FSF copyright for Emacs too, but none of the
code on this fork was written by me.)


John also independently made some later changes to his original
code, and the current version of that can be found here:

https://github.com/jkitchin/scimax/blob/740591268a868b4944193e0600bf71b6f2553f2b/scimax-org.el#L1426


Both implementations depend upon the dash library, so I expect
the relevant bits of code would need rewriting.  I suspect that a
standard implementation would be able to approach things a bit
differently in any case; but the existing code would surely
provide at minimum a valuable reference for a core implementation,
and I imagine at least some of the code could be used verbatim.

I'm not familiar with org-mode internals, so I've not attempted
to provide a patch for this, but I'm hoping there's enough here
that someone with existing knowledge could run with it, as it
seems like a nice feature to include.


-Phil



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