RE: [PATCH v2] format-patch: make output filename configurable

>For the past 15 years, we've used the hardcoded 64 as the length limit of the
>filename of the output from the "git format-patch"
>command.  Since the value is shorter than the 80-column terminal, it could grow
>without line wrapping a bit.  At the same time, since the value is longer than half
>of the 80-column terminal, we could fit two or more of them in "ls" output on
>such a terminal if we allowed to lower it.
>
>Introduce a new command line option --filename-max-length=<n> and a new
>configuration variable format.filenameMaxLength to override the hardcoded
>default.
>

>While we are at it, remove a check that the name of output directory does not
>exceed PATH_MAX---this check is pointless in that by the time control reaches the
>function, the caller would already have done an equivalent of "mkdir -p", so if the
>system does not like an overly long directory name, the control wouldn't have
>reached here, and otherwise, we know that the system allowed the output
>directory to exist.  In the worst case, we will get an error when we try to open the
>output file and handle the error correctly anyway.
>
>Signed-off-by: Junio C Hamano <gitster@pobox.com>