Junio C Hamano <gits...@pobox.com> wrote:
> Eric Wong <normalper...@yhbt.net> writes:
>
> > Using a YYYYmmddHHMMSS date representation is more meaningful to
> > humans, especially when used for lookups on NNTP servers or linking
> > to archive sites via Message-ID (e.g. mid.gmane.org or
> > mid.mail-archive.com). This timestamp format more easily gives a
> > reader of the URL itself a rough date of a linked message compared
> > to having them calculate the seconds since the Unix epoch.
> >
> > Furthermore, having the MUA name in the Message-ID seems to be a
> > rare oddity I haven't noticed outside of git-send-email. We
> > already have an optional X-Mailer header field to advertise for
> > us, so extending the Message-ID by 15 characters can make for
> > unpleasant Message-ID-based URLs to archive sites.
> >
> > Signed-off-by: Eric Wong <normalper...@yhbt.net>
> > ---
>
> Sounds like a sensible goal. Just a few comments.
>
> - Is it safe to assume that we always can use POSIX::strftime(), or
> do we need some fallback? I am guessing that this is safe, as
> POSIX has been part of the core modules for a long time, and the
> script does "use 5.008" upfront.
I'm hoping so :) And none of the format specifiers used here
should be subject to locale-dependent weirdness, at least.
+Cc both Johannes for Windows knowledge.
> - It is my understanding that, as "use" is a compilation-time
> thing, hiding it inside a block does not help reducing the
> start-up overhead (people can use "require" if they want to do a
> lazy loading and optionally a fallback). Is my Perl5 outdated?
> Otherwise, let's have it near the beginning of the script, close
> to where we use Term::ReadLine and others.
You're correct, I'll move the "use" to the top in v2.
I could call "require" and call the sub as "POSIX::strftime",
but this code path is likely enough that any startup time
improvement for uncommon cases wouldn't be worth it.
Will wait a bit for strftime portability comments before v2.
> > --- a/git-send-email.perl
> > +++ b/git-send-email.perl
> > @@ -949,7 +949,8 @@ my ($message_id_stamp, $message_id_serial);
> > sub make_message_id {
> > my $uniq;
> > if (!defined $message_id_stamp) {
> > - $message_id_stamp = sprintf("%s-%s", time, $$);
> > + use POSIX qw/strftime/;
> > + $message_id_stamp = strftime("%Y%m%d%H%M%S.$$", gmtime(time));
> > $message_id_serial = 0;
> > }
> > $message_id_serial++;
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