        Send a patch from the current or specified topic branch as
        email(s).

        Takes the patch given on the command line and emails it out.
        Destination addresses such as To, Cc and Bcc are taken from the
        patch header.

        Since it actually boils down to `git send-email`, please refer
        to the documentation for that for details on how to setup email
        for git.  You can pass arbitrary options to this command through
        the `-s` parameter, but you must double-quote everything.  The
        `-r` parameter with a msgid can be used to generate in-reply-to
        and reference headers to an earlier mail.

        WARNING: be careful when using this command.  It easily sends
        out several mails.  You might want to run:

                git config sendemail.confirm always

        to let `git send-email` ask for confirmation before sending any
        mail.

        | TODO: `tg mail patchfile` to mail an already exported patch
        | TODO: mailing patch series
        | TODO: specifying additional options and addresses on command line

