Subject: Why doesn't git-am does not like >8 scissors mark?

From: Junio Hamano <[email-masked]>
Date: Thu, 20 Aug 2009 17:18:22 -0700

Subject: [PATCH] BLAH ONE

In real life, we will see a discussion that inspired this patch
discussing related and unrelated things around >8 scissors mark
in this part of the message.

Subject: [PATCH] BLAH TWO

And then we will see the scissors.

 This line is not a scissors mark -- >8 -- but talks about it.
 - - >8 - - please remove everything above this line - - >8 - -

Subject: [PATCH] Teach mailinfo to ignore everything before -- >8 -- mark
From: Junio C Hamano <[email-masked]>

This teaches mailinfo the scissors -- >8 -- mark; the command ignores
everything before it in the message body.

Signed-off-by: Junio C Hamano <[email-masked]>
---
 builtin-mailinfo.c |   37 ++++++++++++++++++++++++++++++++++++-
 1 files changed, 36 insertions(+), 1 deletions(-)

diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index b0b5d8f..461c47e 100644
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -712,6 +712,34 @@ static inline int patchbreak(const struct strbuf *line)
 	return 0;
 }
 
+static int scissors(const struct strbuf *line)
+{
+	size_t i, len = line->len;
+	int scissors_dashes_seen = 0;
+	const char *buf = line->buf;
+
+	for (i = 0; i < len; i++) {
+		if (isspace(buf[i]))
+			continue;
+		if (buf[i] == '-') {
+			scissors_dashes_seen |= 02;
+			continue;
+		}
+		if (i + 1 < len && !memcmp(buf + i, ">8", 2)) {
+			scissors_dashes_seen |= 01;
+			i++;
+			continue;
+		}
+		if (i + 7 < len && !memcmp(buf + i, "cut here", 8)) {
+			i += 7;
+			continue;
+		}
+		/* everything else --- not scissors */
+		break;
+	}
+	return scissors_dashes_seen == 03;
+}
+
 static int handle_commit_msg(struct strbuf *line)
 {
 	static int still_looking = 1;
@@ -723,10 +751,17 @@ static int handle_commit_msg(struct strbuf *line)
 		strbuf_ltrim(line);
 		if (!line->len)
 			return 0;
-		if ((still_looking = check_header(line, s_hdr_data, 0)) != 0)
+		still_looking = check_header(line, s_hdr_data, 0);
+		if (still_looking)
 			return 0;
 	}
 
+	if (scissors(line)) {
+		fseek(cmitmsg, 0L, SEEK_SET);
+		still_looking = 1;
+		return 0;
+	}
+
 	/* normalize the log message to UTF-8. */
 	if (metainfo_charset)
 		convert_to_utf8(line, charset.buf);
-- 
1.6.4.1