Re: [PATCH] emacs: Add notmuch-show-local-dates option

[Daniel Kahn Gillmor <dkg@fifthhorseman.net>]

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On Thu 2020-07-02 18:02:34 -0400, Kevin Foley wrote:
> Daniel Kahn Gillmor <dkg@fifthhorseman.net> writes:
>> and it could take three values:
>>
>>  - nil (default), shows the Date: header as received
>>  - t, shows the timestamp from the Date: header in local time, 
>>    with the as-received header in parens afterward (see below)
>>  - "only", shows only the timestamp in localtime
>>
>
> I feel like "only" makes more sense as the option to be used for t, and
> having "both" as another option.

I'm fine either way.

>> so if your system is TZ=UTC, and notmuch-show-date-header-localtime is
>> set to t, and you're looking at a message sent from TZ=America/New_York,
>> you might see:
>>
>> Date: Thu, 02 Jul 2020 19:34:53 +0000 (Thu, 02 Jul 2020 15:34:53 -0400)
>
> Actually, seeing it written out here makes me realize some people could
> potentially prefer:
>
> Date: {sent-tz-datetime} ({system-tz-datetime})
>
> or some other kind of formatting.
>
> Would it make sense to allow a function instead of "both", which would
> be passed the time and let the user return it formatted how they would
> like?  Or is that over-complicating things?

For a toolkit, i like the idea of a function.  For an end-user-facing
MUA, i like opinionated decisions that do obviously the right thing,
without requiring the user to fiddle with anything.

We're struggling a bit here because notmuch-emacs is sort of in the
middle of these two things -- sometimes the one, other times the other.

Pushing on the "just do the right thing" front:

What if there were no configuration variable at all, and it just always
shows "both" ?  Or, even cleverer, what if it only shows both if the
current TZ differs from the sender's TZ?

So if i'm in TZ=America/New_York, and the sender is in
TZ=America/New_York, i would just see the normal header:

    Date: Fri, 03 Jul 2020 13:22:36 -0400

But if the sender is in TZ=Europe/Berlin, i would see:

    Date: Fri, 03 Jul 2020 13:22:36 -0400 [Fri, 03 Jul 2020 19:22:36 +0200]

(Note that RFC 5322 Date format shows the hour offset, but not the
actual TZ -- i can't tell from -0400 whether someone is in
TZ=America/New_York or TZ=America/Manaus)

Is there anyone who would complain about this just being the default
behavior -- with no additional settings to change?

         --dkg

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