Add the options `:dir` and `:base` to the %(refname) atom. The `:dir`
option gives the directory (the part after $GIT_DIR/) of the ref without
the refname. The `:base` option gives the base directory of the given
ref (i.e. the directory following $GIT_DIR/refs/).

Add tests and documentation for the same.

Signed-off-by: Karthik Nayak <karthik....@gmail.com>
---
 Documentation/git-for-each-ref.txt |  4 +++-
 ref-filter.c                       | 28 +++++++++++++++++++++++++---
 t/t6300-for-each-ref.sh            |  2 ++
 3 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/Documentation/git-for-each-ref.txt 
b/Documentation/git-for-each-ref.txt
index be763c4..0d7d80f 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -96,7 +96,9 @@ refname::
        slash-separated path components from the front of the refname
        (e.g., `%(refname:strip=2)` turns `refs/tags/foo` into `foo`.
        `<N>` must be a positive integer.  If a displayed ref has fewer
-       components than `<N>`, the command aborts with an error.
+       components than `<N>`, the command aborts with an error. For the base
+       directory of the ref (i.e. foo in refs/foo/bar/boz) append
+       `:base`. For the entire directory path append `:dir`.
 
 objecttype::
        The type of the object (`blob`, `tree`, `commit`, `tag`).
diff --git a/ref-filter.c b/ref-filter.c
index dc1e404..73e0a7f 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -64,7 +64,7 @@ static struct used_atom {
                } objectname;
                enum { S_FULL, S_SHORT } symref;
                struct {
-                       enum { R_NORMAL, R_SHORT, R_STRIP } option;
+                       enum { R_BASE, R_DIR, R_NORMAL, R_SHORT, R_STRIP } 
option;
                        unsigned int strip;
                } refname;
        } u;
@@ -243,7 +243,11 @@ static void refname_atom_parser(struct used_atom *atom, 
const char *arg)
                if (strtoul_ui(arg, 10, &atom->u.refname.strip) ||
                        atom->u.refname.strip <= 0)
                        die(_("positive value expected refname:strip=%s"), arg);
-       } else
+       } else if (!strcmp(arg, "dir"))
+               atom->u.contents.option = R_DIR;
+       else if (!strcmp(arg, "base"))
+               atom->u.contents.option = R_BASE;
+       else
                die(_("unrecognized %%(refname) argument: %s"), arg);
 }
 
@@ -1175,7 +1179,25 @@ static const char *get_refname(struct used_atom *atom, 
struct ref_array_item *re
                return shorten_unambiguous_ref(ref->refname, 
warn_ambiguous_refs);
        else if (atom->u.refname.option == R_STRIP)
                return strip_ref_components(ref->refname, 
atom->u.refname.strip);
-       else
+       else if (atom->u.refname.option == R_BASE) {
+               const char *sp, *ep;
+
+               if (skip_prefix(ref->refname, "refs/", &sp)) {
+                       ep = strchr(sp, '/');
+                       if (!ep)
+                               return "";
+                       return xstrndup(sp, ep - sp);
+               }
+               return "";
+       } else if (atom->u.refname.option == R_DIR) {
+               const char *sp, *ep;
+
+               sp = ref->refname;
+               ep = strrchr(sp, '/');
+               if (!ep)
+                       return "";
+               return xstrndup(sp, ep - sp);
+       } else
                return ref->refname;
 }
 
diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index b06ea1c..36d32d7 100755
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -53,6 +53,8 @@ test_atom head refname refs/heads/master
 test_atom head refname:short master
 test_atom head refname:strip=1 heads/master
 test_atom head refname:strip=2 master
+test_atom head refname:dir refs/heads
+test_atom head refname:base heads
 test_atom head upstream refs/remotes/origin/master
 test_atom head upstream:short origin/master
 test_atom head push refs/remotes/myfork/master
-- 
2.8.0

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