[MlMt] RSVP/respond to ical/.ics calendar invite?

[Benny Kjær Nielsen]

On 19 Oct 2017, at 17:31, Giovanni Lanzani wrote:

>>>   - the status
>>
>> What kind of status?
>
> You don't do many meetings, do you? :) It's accepted, rejected, maybe

I should perhaps start arranging meetings with myself in order to better 
understand the world outside :)

>>>   - optionally a remark.
>>
>> Remark?
>
> When replying to a meeting you can add a remark such as: "I'll be 
> available only for the first part of the meeting". The remark and the 
> status should come, either as env variables or via stdin, from 
> Mailmate I guess. Is that even possible? Remark is not a priority (I 
> guess).

I guess what I meant to ask was where this information is stored. If 
it's inside the attachment then this part of the work should be left to 
the bundle command itself. If it's somehow in the headers of the message 
then MailMate should provide the values (and can do so using environment 
variables).

>> Do you think they would be sufficient? Or do you need more detailed 
>> control of the construction of the MIME message?
>
> I don't know :)
>
> Looking at the raw message of an invite, it looks like this. From 
> Python I could just supply the base64 encoded content. If Mailmate 
> would handle the rest: that'd be swell! :)

When MailMate can be told to attach something then it should just be a 
`text/calendar` formatted file. Then that would be encoded as base64 by 
MailMate.

> ```
> Content-Type: multipart/alternative;
> 	Content-Type: text/plain; charset="utf-8"
> 	Content-Type: text/calendar; charset="utf-8"; method=REPLY
> ```

Ok, what I thought was weird about this is that the above means that 
MailMate should show the `text/calendar` part and ignore the 
`text/plain` part. The `text/calendar` part is not really an attachment. 
But I now realize that this is really how it's supposed to work (based 
on the [RFC](https://tools.ietf.org/html/rfc6047)). The problem is that 
MailMate doesn't know how to display `text/calendar` and therefore needs 
to both display the `text/plain` part and make the `text/calendar` part 
available to the user. I'll keep this in mind when looking into 
attachments-handling via bundle commands.

-- 
Benny
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