git am/mailinfo: Don't look at in-body headers when rebasing

When we are rebasing we know that the header lines in the
patch are good and that we don't need to pick up any headers
from the body of the patch.

This makes it possible to rebase commits whose commit message
start with "From" or "Date".

Test vectors by Jeff King.

Signed-off-by: Lukas Sandström <luksan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

16 files changed, 122 insertions, 5 deletions

diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index c90cd312ac..3c4f0753fe 100644
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -26,6 +26,7 @@ static struct strbuf charset = STRBUF_INIT;
 static int patch_lines;
 static struct strbuf **p_hdr_data, **s_hdr_data;
 static int use_scissors;
+static int use_inbody_headers = 1;
 
 #define MAX_HDR_PARSED 10
 #define MAX_BOUNDARIES 5
@@ -774,10 +775,17 @@ static int handle_commit_msg(struct strbuf *line)
 		strbuf_ltrim(line);
 		if (!line->len)
 			return 0;
+	}
+
+	if (use_inbody_headers && still_looking) {
 		still_looking = check_header(line, s_hdr_data, 0);
 		if (still_looking)
 			return 0;
-	}
+	} else
+		/* Only trim the first (blank) line of the commit message
+		 * when ignoring in-body headers.
+		 */
+		still_looking = 0;
 
 	/* normalize the log message to UTF-8. */
 	if (metainfo_charset)
@@ -1033,6 +1041,8 @@ int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 			use_scissors = 1;
 		else if (!strcmp(argv[1], "--no-scissors"))
 			use_scissors = 0;
+		else if (!strcmp(argv[1], "--no-inbody-headers"))
+			use_inbody_headers = 0;
 		else
 			usage(mailinfo_usage);
 		argc--; argv++;
diff --git a/git-am.sh b/git-am.sh
index c132f50da5..96869a2453 100755
--- a/git-am.sh
+++ b/git-am.sh
@@ -289,7 +289,7 @@ split_patches () {
 prec=4
 dotest="$GIT_DIR/rebase-apply"
 sign= utf8=t keep= skip= interactive= resolved= rebasing= abort=
-resolvemsg= resume= scissors=
+resolvemsg= resume= scissors= no_inbody_headers=
 git_apply_opt=
 committer_date_is_author_date=
 ignore_date=
@@ -322,7 +322,7 @@ do
 	--abort)
 		abort=t ;;
 	--rebasing)
-		rebasing=t threeway=t keep=t scissors=f ;;
+		rebasing=t threeway=t keep=t scissors=f no_inbody_headers=t ;;
 	-d|--dotest)
 		die "-d option is no longer supported.  Do not use."
 		;;
@@ -448,6 +448,7 @@ else
 	echo "$utf8" >"$dotest/utf8"
 	echo "$keep" >"$dotest/keep"
 	echo "$scissors" >"$dotest/scissors"
+	echo "$no_inbody_headers" >"$dotest/no_inbody_headers"
 	echo "$GIT_QUIET" >"$dotest/quiet"
 	echo 1 >"$dotest/next"
 	if test -n "$rebasing"
@@ -495,6 +496,12 @@ t)
 f)
 	scissors=--no-scissors ;;
 esac
+if test "$(cat "$dotest/no_inbody_headers")" = t
+then
+	no_inbody_headers=--no-inbody-headers
+else
+	no_inbody_headers=
+fi
 if test "$(cat "$dotest/quiet")" = t
 then
 	GIT_QUIET=t
@@ -549,7 +556,7 @@ do
 	# by the user, or the user can tell us to do so by --resolved flag.
 	case "$resume" in
 	'')
-		git mailinfo $keep $scissors $utf8 "$dotest/msg" "$dotest/patch" \
+		git mailinfo $keep $no_inbody_headers $scissors $utf8 "$dotest/msg" "$dotest/patch" \
 			<"$dotest/$msgnum" >"$dotest/info" ||
 			stop_here $this
 
diff --git a/t/t5100-mailinfo.sh b/t/t5100-mailinfo.sh
index 0279d07c83..ebc36c1758 100755
--- a/t/t5100-mailinfo.sh
+++ b/t/t5100-mailinfo.sh
@@ -11,7 +11,7 @@ test_expect_success 'split sample box' \
 	'git mailsplit -o. "$TEST_DIRECTORY"/t5100/sample.mbox >last &&
 	last=`cat last` &&
 	echo total is $last &&
-	test `cat last` = 14'
+	test `cat last` = 16'
 
 check_mailinfo () {
 	mail=$1 opt=$2
@@ -30,6 +30,10 @@ do
 		if test -f "$TEST_DIRECTORY"/t5100/msg$mail--scissors
 		then
 			check_mailinfo $mail --scissors
+		fi &&
+		if test -f "$TEST_DIRECTORY"/t5100/msg$mail--no-inbody-headers
+		then
+			check_mailinfo $mail --no-inbody-headers
 		fi
 	'
 done
diff --git a/t/t5100/info0015 b/t/t5100/info0015
new file mode 100644
index 0000000000..0114f106c5
--- /dev/null
+++ b/t/t5100/info0015
@@ -0,0 +1,5 @@
+Author: 
+Email: 
+Subject: check bogus body header (from)
+Date: Fri, 9 Jun 2006 00:44:16 -0700
+
diff --git a/t/t5100/info0015--no-inbody-headers b/t/t5100/info0015--no-inbody-headers
new file mode 100644
index 0000000000..c4d8d7720e
--- /dev/null
+++ b/t/t5100/info0015--no-inbody-headers
@@ -0,0 +1,5 @@
+Author: A U Thor
+Email: a.u.thor@example.com
+Subject: check bogus body header (from)
+Date: Fri, 9 Jun 2006 00:44:16 -0700
+
diff --git a/t/t5100/info0016 b/t/t5100/info0016
new file mode 100644
index 0000000000..38ccd0dcf2
--- /dev/null
+++ b/t/t5100/info0016
@@ -0,0 +1,5 @@
+Author: A U Thor
+Email: a.u.thor@example.com
+Subject: check bogus body header (date)
+Date: bogus 
+
diff --git a/t/t5100/info0016--no-inbody-headers b/t/t5100/info0016--no-inbody-headers
new file mode 100644
index 0000000000..f4857d45df
--- /dev/null
+++ b/t/t5100/info0016--no-inbody-headers
@@ -0,0 +1,5 @@
+Author: A U Thor
+Email: a.u.thor@example.com
+Subject: check bogus body header (date)
+Date: Fri, 9 Jun 2006 00:44:16 -0700
+
diff --git a/t/t5100/msg0015 b/t/t5100/msg0015
new file mode 100644
index 0000000000..9577238685
--- /dev/null
+++ b/t/t5100/msg0015
@@ -0,0 +1,2 @@
+- a list
+  - of stuff
diff --git a/t/t5100/msg0015--no-inbody-headers b/t/t5100/msg0015--no-inbody-headers
new file mode 100644
index 0000000000..be5115b1c1
--- /dev/null
+++ b/t/t5100/msg0015--no-inbody-headers
@@ -0,0 +1,3 @@
+From: bogosity
+  - a list
+  - of stuff
diff --git a/t/t5100/msg0016 b/t/t5100/msg0016
new file mode 100644
index 0000000000..0d9adada96
--- /dev/null
+++ b/t/t5100/msg0016
@@ -0,0 +1,2 @@
+and some content
+
diff --git a/t/t5100/msg0016--no-inbody-headers b/t/t5100/msg0016--no-inbody-headers
new file mode 100644
index 0000000000..1063f51178
--- /dev/null
+++ b/t/t5100/msg0016--no-inbody-headers
@@ -0,0 +1,4 @@
+Date: bogus
+
+and some content
+
diff --git a/t/t5100/patch0015 b/t/t5100/patch0015
new file mode 100644
index 0000000000..ad64848873
--- /dev/null
+++ b/t/t5100/patch0015
@@ -0,0 +1,8 @@
+---
+diff --git a/foo b/foo
+index e69de29..d95f3ad 100644
+--- a/foo
++++ b/foo
+@@ -0,0 +1 @@
++content
+
diff --git a/t/t5100/patch0015--no-inbody-headers b/t/t5100/patch0015--no-inbody-headers
new file mode 100644
index 0000000000..ad64848873
--- /dev/null
+++ b/t/t5100/patch0015--no-inbody-headers
@@ -0,0 +1,8 @@
+---
+diff --git a/foo b/foo
+index e69de29..d95f3ad 100644
+--- a/foo
++++ b/foo
+@@ -0,0 +1 @@
++content
+
diff --git a/t/t5100/patch0016 b/t/t5100/patch0016
new file mode 100644
index 0000000000..ad64848873
--- /dev/null
+++ b/t/t5100/patch0016
@@ -0,0 +1,8 @@
+---
+diff --git a/foo b/foo
+index e69de29..d95f3ad 100644
+--- a/foo
++++ b/foo
+@@ -0,0 +1 @@
++content
+
diff --git a/t/t5100/patch0016--no-inbody-headers b/t/t5100/patch0016--no-inbody-headers
new file mode 100644
index 0000000000..ad64848873
--- /dev/null
+++ b/t/t5100/patch0016--no-inbody-headers
@@ -0,0 +1,8 @@
+---
+diff --git a/foo b/foo
+index e69de29..d95f3ad 100644
+--- a/foo
++++ b/foo
+@@ -0,0 +1 @@
++content
+
diff --git a/t/t5100/sample.mbox b/t/t5100/sample.mbox
index 13fa4ae03b..de1031241d 100644
--- a/t/t5100/sample.mbox
+++ b/t/t5100/sample.mbox
@@ -650,3 +650,36 @@ index b0b5d8f..461c47e 100644
  		convert_to_utf8(line, charset.buf);
 -- 
 1.6.4.1
+From nobody Mon Sep 17 00:00:00 2001
+From: A U Thor <a.u.thor@example.com>
+Subject: check bogus body header (from)
+Date: Fri, 9 Jun 2006 00:44:16 -0700
+
+From: bogosity
+  - a list
+  - of stuff
+---
+diff --git a/foo b/foo
+index e69de29..d95f3ad 100644
+--- a/foo
++++ b/foo
+@@ -0,0 +1 @@
++content
+
+From nobody Mon Sep 17 00:00:00 2001
+From: A U Thor <a.u.thor@example.com>
+Subject: check bogus body header (date)
+Date: Fri, 9 Jun 2006 00:44:16 -0700
+
+Date: bogus
+
+and some content
+
+---
+diff --git a/foo b/foo
+index e69de29..d95f3ad 100644
+--- a/foo
++++ b/foo
+@@ -0,0 +1 @@
++content
+