[PATCH] tag: implement --no-strip option

["Kirill A. Shutemov" <kirill@shutemov.name>]

From: "Kirill A. Shutemov" <kirill@shutemov.name>

--no-strip turns off strip any comments or empty lines.

It's useful if you want to take a tag message as-is, without any
stripping.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
---
 Documentation/git-tag.txt |    4 ++++
 builtin/tag.c             |   13 ++++++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index c83cb13..947d4e5 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -99,6 +99,10 @@ OPTIONS
 	Implies `-a` if none of `-a`, `-s`, or `-u <key-id>`
 	is given.
 
+-S::
+--no-strip::
+	Take tag message as-is. Do not strip any comments or empty lines.
+
 <tagname>::
 	The name of the tag to create, delete, or describe.
 	The new tag name must pass all checks defined by
diff --git a/builtin/tag.c b/builtin/tag.c
index 9b6fd95..427d646 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -320,7 +320,7 @@ static int build_tag_object(struct strbuf *buf, int sign, unsigned char *result)
 }
 
 static void create_tag(const unsigned char *object, const char *tag,
-		       struct strbuf *buf, int message, int sign,
+		       struct strbuf *buf, int message, int sign, int nostrip,
 		       unsigned char *prev, unsigned char *result)
 {
 	enum object_type type;
@@ -356,7 +356,7 @@ static void create_tag(const unsigned char *object, const char *tag,
 
 		if (!is_null_sha1(prev))
 			write_tag_body(fd, prev);
-		else
+		else if (!nostrip)
 			write_or_die(fd, _(tag_template), strlen(_(tag_template)));
 		close(fd);
 
@@ -367,7 +367,8 @@ static void create_tag(const unsigned char *object, const char *tag,
 		}
 	}
 
-	stripspace(buf, 1);
+	if (!nostrip)
+		stripspace(buf, 1);
 
 	if (!message && !buf->len)
 		die(_("no tag message?"));
@@ -423,7 +424,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 	const char *object_ref, *tag;
 	struct ref_lock *lock;
 
-	int annotate = 0, sign = 0, force = 0, lines = -1,
+	int annotate = 0, sign = 0, nostrip = 0, force = 0, lines = -1,
 		list = 0, delete = 0, verify = 0;
 	const char *msgfile = NULL, *keyid = NULL;
 	struct msg_arg msg = { 0, STRBUF_INIT };
@@ -443,6 +444,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 			     "tag message", parse_msg_arg),
 		OPT_FILENAME('F', "file", &msgfile, "read message from file"),
 		OPT_BOOLEAN('s', "sign", &sign, "annotated and GPG-signed tag"),
+		OPT_BOOLEAN('S', "no-strip", &nostrip,
+					"turn off tag message stripping"),
 		OPT_STRING('u', "local-user", &keyid, "key-id",
 					"use another key to sign the tag"),
 		OPT__FORCE(&force, "replace the tag if exists"),
@@ -525,7 +528,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 
 	if (annotate)
 		create_tag(object, tag, &buf, msg.given || msgfile,
-			   sign, prev, object);
+			   sign, nostrip, prev, object);
 
 	lock = lock_any_ref_for_update(ref.buf, prev, 0);
 	if (!lock)
-- 
1.7.7.2