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Improving Emacs' iCalendar support


From: Richard Lawrence
Subject: Improving Emacs' iCalendar support
Date: Fri, 18 Oct 2024 11:01:10 +0200

Dear emacs-devel,

Hello! I've been a happy Emacs user for almost twenty years now(!), but
this is my first time subscribing to this list, so please help me follow
the local conventions.

I would like to start a discussion about improving Emacs' iCalendar
support, beyond what is already available in icalendar.el. I personally
would like to see Emacs gain a more full-fledged RFC5545 implementation
that is primarily designed as a library for other applications to use.

This is an itch that's been bugging me for a while, and so for the past
couple of weeks I've been working on scratching it, and I now have a
reasonable chunk of work to share: I've drafted a new implementation of
the iCalendar grammar, and a major mode which uses this grammar to
provide syntax highlighting. I wrote up what I've done and why here:

https://recursewithless.net/emacs/icalendar-parser-and-mode.org

That's a literate Org mode file containing the code and my commentary.
If you just want to read the code itself, see:

https://recursewithless.net/emacs/icalendar/icalendar-parser.el
https://recursewithless.net/emacs/icalendar/icalendar-mode.el

I could release this work as a package, but as I describe in more
detail in the write-up, I think there's a good case that an improved
iCalendar library belongs in Emacs' core. There are currently at least
*three* partial iCalendar implementations in Emacs (icalendar.el,
gnus-icalendar.el, and ox-icalendar.el), which are each focused on a
particular major mode (diary, Gnus, and Org). I think it would be good
to consolidate this work in one place and generalize it so that all
three of these applications, as well as third party packages, can
benefit.

So, some questions for the list:

1) Is there interest in getting this code, and/or a future version of
such a library, into Emacs?

And if so, 
2) Would anyone here be willing to mentor me/collaborate with me on it?
3) What should the library's API look like? What would be most useful?

Many thanks for your thoughts and feedback!

Best,
Richard



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