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.
---
 Documentation/git-for-each-ref.txt |  4 +++-
 ref-filter.c                       | 23 +++++++++++++++++++
 t/t6302-for-each-ref-filter.sh     | 47 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-for-each-ref.txt 
b/Documentation/git-for-each-ref.txt
index 206d646..b8d33a1 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -92,7 +92,9 @@ refname::
        The name of the ref (the part after $GIT_DIR/).
        For a non-ambiguous short name of the ref append `:short`.
        The option core.warnAmbiguousRefs is used to select the strict
-       abbreviation mode.
+       abbreviation mode. 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 359c76d..94d8754 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1105,6 +1105,29 @@ static void populate_value(struct ref_array_item *ref)
                                else
                                        v->s = "<>";
                                continue;
+                       } else if (!strcmp(formatp, "dir") &&
+                                  (starts_with(name, "refname"))) {
+                               const char *sp, *ep, *tmp;
+
+                               sp = tmp = ref->refname;
+                               /*  Obtain refs/foo/bar/ from refname 
refs/foo/bar/abc */
+                               do {
+                                       ep = tmp;
+                                       tmp = strchr(ep + 1, '/');
+                               } while (tmp);
+                               v->s = xstrndup(sp, ep - sp);
+                               continue;
+                       } else if (!strcmp(formatp, "base") &&
+                                  (starts_with(name, "refname"))) {
+                               const char *sp, *ep;
+
+                               if (skip_prefix(ref->refname, "refs/", &sp)) {
+                                       ep = strchr(sp, '/');
+                                       if (!ep)
+                                               continue;
+                                       v->s = xstrndup(sp, ep - sp);
+                               }
+                               continue;
                        } else
                                die("unknown %.*s format %s",
                                    (int)(formatp - name), name, formatp);
diff --git a/t/t6302-for-each-ref-filter.sh b/t/t6302-for-each-ref-filter.sh
index f45ac1f..19a5075 100755
--- a/t/t6302-for-each-ref-filter.sh
+++ b/t/t6302-for-each-ref-filter.sh
@@ -340,4 +340,51 @@ test_expect_success 'check %(if:notequals=<string>)' '
        test_cmp expect actual
 '
 
+test_expect_success 'update refs for %(refname:dir) and %(refname:base)' '
+       git update-ref refs/foo HEAD &&
+       git update-ref refs/foodir/bar/boz HEAD
+'
+
+test_expect_success 'check %(refname:dir)' '
+       git for-each-ref --format="%(refname:dir)" >actual &&
+       cat >expect <<-\EOF &&
+       refs
+       refs/foodir/bar
+       refs/heads
+       refs/heads
+       refs/odd
+       refs/tags
+       refs/tags
+       refs/tags
+       refs/tags
+       refs/tags
+       refs/tags
+       refs/tags
+       refs/tags
+       refs/tags
+       EOF
+       test_cmp expect actual
+'
+
+test_expect_success 'check %(refname:base)' '
+       git for-each-ref --format="%(refname:base)" >actual &&
+       cat >expect <<-\EOF &&
+       
+       foodir
+       heads
+       heads
+       odd
+       tags
+       tags
+       tags
+       tags
+       tags
+       tags
+       tags
+       tags
+       tags
+       EOF
+       test_cmp expect actual
+'
+
 test_done
-- 
2.6.0

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