format-patch: --inline-singlejc/format-patch

Some people may find it convenient to append a simple patch at the
bottom of a discussion e-mail separated by a "scissors" mark, ready
to be applied with "git am -c".  Introduce "--inline-single" option
to format-patch to do so.  A typical usage example might be to start
'f'ollow-up to a discussion, write your message, conclude with "a
patch to do so may look like this.", and then

    \C-u M-! git format-patch --inline-single -1 HEAD <ENTER>

if you are an Emacs user.  Users of other MUA's may want to consult
their manuals to find an equivalent command to append output from an
external command to the message being composed.

It does not make any sense to use this mode when formatting multiple
patches, or to combine this with options such as --attach, --inline,
and --cover-letter, so some of such uses are forbidden.  There may
be more insane combination the check in this patch may not even
bother to reject.  Caveat emptor.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/commit.h b/commit.h
index 057ff8045e..c7d026bb2d 100644
--- a/commit.h
+++ b/commit.h
@@ -86,6 +86,7 @@ struct pretty_print_context {
 	int preserve_subject;
 	enum date_mode date_mode;
 	unsigned date_mode_explicit:1;
+	unsigned inline_single:1;
 	int need_8bit_cte;
 	char *notes_message;
 	struct reflog_walk_info *reflog_info;