worktree move: accept destination as directory

Similar to "mv a b/", which is actually "mv a b/a", we extract basename
of source worktree and create a directory of the same name at
destination if dst path is a directory.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

strbuf.c

@@ -95,6 +95,7 @@ void strbuf_trim(struct strbuf *sb)
 	strbuf_rtrim(sb);
 	strbuf_ltrim(sb);
 }
+
 void strbuf_rtrim(struct strbuf *sb)
 {
 	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
@@ -102,6 +103,13 @@ void strbuf_rtrim(struct strbuf *sb)
 	sb->buf[sb->len] = '\0';
 }
 
+void strbuf_trim_trailing_dir_sep(struct strbuf *sb)
+{
+	while (sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]))
+		sb->len--;
+	sb->buf[sb->len] = '\0';
+}
+
 void strbuf_ltrim(struct strbuf *sb)
 {
 	char *b = sb->buf;