[PATCH] cherry-pick: Add an option to prepend a string to the commit message

@@ -62,6 +62,13 @@ OPTIONS
 	option is used, your index does not have to match the
 	HEAD commit.  The cherry-pick is done against the
 	beginning state of your index.
+
+--prepend::
+	Specify a string to prepend to the commit message.  This
+	can be useful situations where you have a batch of commits
+	to cherry-pick and need to prefix each new commit message
+	with similar information (such as the subversion revision,
+	when used in conjunction with git-svn).
 +
 This is useful when cherry-picking more than one commits'
 effect to your index in a row.

@@ -44,6 +44,7 @@ static int allow_rerere_auto;
 
 static const char *me;
 static const char *strategy;
+static const char *prepend;
 
 #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
 

@@ -64,7 +65,7 @@ static void parse_args(int argc, const char **argv)
 		OPT_INTEGER('m', "mainline", &mainline, "parent number"),
 		OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
 		OPT_STRING(0, "strategy", &strategy, "strategy", "merge strategy"),
-		OPT_END(),
+		OPT_STRING(0, "prepend", &prepend, "message", "string to prepend to the commit message"),
 		OPT_END(),
 		OPT_END(),
 	};

@@ -392,6 +393,8 @@ static int revert_or_cherry_pick(int argc, const char **argv)
 			die("cherry-pick --ff cannot be used with -x");
 		if (edit)
 			die("cherry-pick --ff cannot be used with --edit");
+		if (prepend)
+			die("cherry-pick --ff cannot be used with --prepend");
 	}
 
 	if (read_cache() < 0)

@@ -482,6 +485,9 @@ static int revert_or_cherry_pick(int argc, const char **argv)
 		next = commit;
 		next_label = msg.label;
 		set_author_ident_env(msg.message);
+		if (prepend) {
+			strbuf_addstr(&msgbuf, prepend);
+		}
 		add_message_to_msg(&msgbuf, msg.message);
 		if (no_replay) {
 			strbuf_addstr(&msgbuf, "(cherry picked from commit ");