Re: [PATCH 9/9] send-email: move trivial config handling to Perl

> Optimize the startup time of git-send-email by using an amended
> config_regexp() function to retrieve the list of config keys and
> values we're interested in.
>
> For boolean keys we can handle the [true|false] case ourselves, and
> the "--get" case didn't need any parsing. Let's leave "--path" and
> other "--bool" cases to "git config". As noted in a preceding commit
> we're free to change the config_regexp() function, it's only used by
> "git send-email".
>
> This brings the runtime of "git send-email" from ~60-~70ms to a very
> steady ~40ms on my test box. We no run just one "git config"

> invocation on startup instead of 8, the exact number will differ based
> on the local sendemail.* config. I happen to have 8 of those set.
>
> This brings the runtime of t9001-send-email.sh from ~13s down to ~12s
> for me. The change there is less impressive as many of those tests set
> various config values, and we're also getting to the point of
> diminishing returns for optimizing "git send-email" itself.
>
> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>