I needed a utility for base64-decoding text parts of MIME messages.

All the tools I tried would (i) fail to crlf->lf convert the text part
(as is needed) or (ii) have an interface which was just too
inconvenient.  Or both.

I'm afraid I have not supplied a manpage, help message, etc.

This program is useful with formail to work around a bug in git-am,
where if it gets a base64-encoded patch it fails because the base64
correctly contains cr-lf line endings.

Ian.

Hello,

Thanks!  I need at least a Signed-off-by per CONTRIBUTING.rst.  Could
you write a manpage, please?  Otherwise, I think discoverability is just
a bit too low to be worth distributing in the archive.

Easiest thing would be if you'd commit your manpage and this script to
mailscripts.git and send a patch generated with git-format-patch(1).
You don't need to plumb it into the building/packaging machinery.