Support a --cc=<email> option in format-patch

When you have particular reviewers you want to sent particular series
to, it's nice to be able to generate the whole series with them as
additional recipients, without configuring them into your general
headers or adding them by hand afterwards.

Signed-off-by: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-format-patch.txt

@@ -17,6 +17,7 @@ SYNOPSIS
 		   [--in-reply-to=Message-Id] [--suffix=.<sfx>]
 		   [--ignore-if-in-upstream]
 		   [--subject-prefix=Subject-Prefix]
+		   [--cc=<email>]
 		   [--cover-letter]
 		   [ <since> | <revision range> ]
 
@@ -136,6 +137,10 @@ include::diff-options.txt[]
 	allows for useful naming of a patch series, and can be
 	combined with the --numbered option.
 
+--cc=<email>::
+	Add a "Cc:" header to the email headers. This is in addition
+	to any configured headers, and may be used multiple times.
+
 --cover-letter::
 	Generate a cover letter template.  You still have to fill in
 	a description, but the shortlog and the diffstat will be

builtin-log.c

@@ -771,6 +771,10 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 				die("Need a number for --start-number");
 			start_number = strtol(argv[i], NULL, 10);
 		}
+		else if (!prefixcmp(argv[i], "--cc=")) {
+			ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
+			extra_cc[extra_cc_nr++] = xstrdup(argv[i] + 5);
+		}
 		else if (!strcmp(argv[i], "-k") ||
 				!strcmp(argv[i], "--keep-subject")) {
 			keep_subject = 1;

t/t4014-format-patch.sh

@@ -122,6 +122,14 @@ test_expect_success 'extra headers with multiple To:s' '
 	grep "^ *S. E. Cipient <scipient@example.com>$" hdrs4
 '
 
+test_expect_success 'additional command line cc' '
+
+	git config --replace-all format.headers "Cc: R. E. Cipient <rcipient@example.com>" &&
+	git format-patch --cc="S. E. Cipient <scipient@example.com>" --stdout master..side | sed -e "/^$/Q" >patch5 &&
+	grep "^Cc: R. E. Cipient <rcipient@example.com>,$" patch5 &&
+	grep "^ *S. E. Cipient <scipient@example.com>$" patch5
+'
+
 test_expect_success 'multiple files' '
 
 	rm -rf patches/ &&