git send-email --notmuch expr

Notmuch is a new mail system with fast indexing and tagging, see notmuchmail.org. It has a command-line tool to build replies to emails, and I wrote a patch to format-patch that enables

  git format-patch --notmuch EXPR

where EXPR is any notmuch query, but usually id:<Message-ID> to match a specific message. This will set up several headers, notably In-Reply-To, References, To, Cc, Bcc. This works great, and the the patch follows this message.

But I really want

  git send-email --notmuch EXPR

This sort-of works, but the interactive part prompts for the various headers (even though format-patch supplies them), and then duplicates the To header (both the possibly empty field the user provided, plus the one coming from format-patch). I had a brief look at git-send-email.perl, and I'm a little confused.

	} elsif (/^(?:To|Cc|Bcc):/i) {
		print "To/Cc/Bcc fields are not interpreted yet, they have been ignored\n";
		next;
	}

This regex doesn't match these headers (is the leading ?: a typo?) so there is no warning. But it's important that these headers *not* be ignored, getting them set automatically is a key feature of the --notmuch option. I'm having trouble discerning whether I would cause problems by just using these headers coming out of format-patch. Presumably there was a reason why they were (intended to be) explicitly ignored, and my poor perl skills are not helping. Could someone enlighten me?

Jed