This code essentially replaces part of ref with another ref, for example
'@{-1}@{u}' is replaced with 'master@{u}', but this can be reused for
other purposes other than nth prior checkouts.

Signed-off-by: Felipe Contreras <felipe.contre...@gmail.com>
---
 sha1_name.c | 42 +++++++++++++++++++++++-------------------
 1 file changed, 23 insertions(+), 19 deletions(-)

diff --git a/sha1_name.c b/sha1_name.c
index 93c4e8c..76e3219 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -965,6 +965,27 @@ int get_sha1_mb(const char *name, unsigned char *sha1)
        return st;
 }
 
+static int reinterpret(const char *name, int namelen, int len, struct strbuf 
*buf)
+{
+       /* we have extra data, which might need further processing */
+       struct strbuf tmp = STRBUF_INIT;
+       int used = buf->len;
+       int ret;
+
+       strbuf_add(buf, name + len, namelen - len);
+       ret = interpret_branch_name(buf->buf, &tmp);
+       /* that data was not interpreted, remove our cruft */
+       if (ret < 0) {
+               strbuf_setlen(buf, used);
+               return len;
+       }
+       strbuf_reset(buf);
+       strbuf_addbuf(buf, &tmp);
+       strbuf_release(&tmp);
+       /* tweak for size of {-N} versus expanded ref name */
+       return ret - used + len;
+}
+
 /*
  * This reads short-hand syntax that not only evaluates to a commit
  * object name, but also can act as if the end user spelled the name
@@ -998,25 +1019,8 @@ int interpret_branch_name(const char *name, struct strbuf 
*buf)
                return len; /* syntax Ok, not enough switches */
        if (len > 0 && len == namelen)
                return len; /* consumed all */
-       else if (len > 0) {
-               /* we have extra data, which might need further processing */
-               struct strbuf tmp = STRBUF_INIT;
-               int used = buf->len;
-               int ret;
-
-               strbuf_add(buf, name + len, namelen - len);
-               ret = interpret_branch_name(buf->buf, &tmp);
-               /* that data was not interpreted, remove our cruft */
-               if (ret < 0) {
-                       strbuf_setlen(buf, used);
-                       return len;
-               }
-               strbuf_reset(buf);
-               strbuf_addbuf(buf, &tmp);
-               strbuf_release(&tmp);
-               /* tweak for size of {-N} versus expanded ref name */
-               return ret - used + len;
-       }
+       else if (len > 0)
+               return reinterpret(name, namelen, len, buf);
 
        cp = strchr(name, '@');
        if (!cp)
-- 
1.8.3.rc0.395.gfe9a10d

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