[RFC] [WIP] Creating icalendar event invitations

[Ferdinand Pieper <fer@pie.tf>]

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Hi all,

gnus has good support to accept/decline icalendar invitations with 
gnus-icalendar.el. I'm looking to extend this to also allow the 
creation of new invitations from within gnus.
Below is a first rough implementation which I for now kept in a 
separate file from gnus-icalendar.el, but the goal would be for 
the code to also live in gnus-icalendar.el.

Most of the code is still very rough and the implementation is not 
handling all cases correctly. I'm mainly sharing it now to ask you 
whether this is a welcome addition to gnus-icalendar and to ask 
for thoughts on the general implementation, before I spend more 
time to polish the code.

How it works: The code adds functions to create RFC5545 compliant 
VCALENDAR and VEVENT parts from gnus-icalendar-event objects and 
also a function to create a event invitation based on the current 
message buffer.
To create the gnus-icalendar-event the mail addresses in the To 
header are converted to required participants, addresses in Cc are 
interpreted as optional participants and the subject and message 
body are added as summary and description of the event. The date 
range and location have to be entered interactively for now.
Please let me know if you have any other ideas on how users could 
create new events.

Next step will be to polish the code so that the basic 
functionality of creating simple one-shot event invitations works 
reliably.
Long term goals include handling request responses and supporting 
a wider range of the RFC5545 spec.

Thanks!


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