Make git-reset delete empty directories

When git-reset --hard is used and a subdirectory becomes
empty (as it contains no tracked files in the target tree)
the empty subdirectory should be removed.  This matches
the behavior of git-checkout-index and git-read-tree -m
which would not have created the subdirectory or would
have deleted it when updating the working directory.

Subdirectories which are not empty will be left behind.
This may happen if the subdirectory still contains object
files from the user's build process (for example).

[jc: simplified the logic a bit, while keeping the test script.]

git-reset.sh

@@ -88,6 +88,9 @@ case "$reset_type" in
 				# it is ok if this fails -- it may already
 				# have been culled by checkout-index.
 				unlink $_;
+				while (s|/[^/]*$||) {
+					rmdir($_) or last;
+				}
 			}
 		}
 	' $tmp-exists

t/t7101-reset.sh

@@ -0,0 +1,63 @@
+#!/bin/sh
+#
+# Copyright (c) 2006 Shawn Pearce
+#
+
+test_description='git-reset should cull empty subdirs'
+. ./test-lib.sh
+
+test_expect_success \
+    'creating initial files' \
+    'mkdir path0 &&
+     cp ../../COPYING path0/COPYING &&
+     git-add path0/COPYING &&
+     git-commit -m add -a'
+
+test_expect_success \
+    'creating second files' \
+    'mkdir path1 &&
+     mkdir path1/path2 &&
+     cp ../../COPYING path1/path2/COPYING &&
+     cp ../../COPYING path1/COPYING &&
+     cp ../../COPYING COPYING &&
+     cp ../../COPYING path0/COPYING-TOO &&
+     git-add path1/path2/COPYING &&
+     git-add path1/COPYING &&
+     git-add COPYING &&
+     git-add path0/COPYING-TOO &&
+     git-commit -m change -a'
+
+test_expect_success \
+    'resetting tree HEAD^' \
+    'git-reset --hard HEAD^'
+
+test_expect_success \
+    'checking initial files exist after rewind' \
+    'test -d path0 &&
+     test -f path0/COPYING'
+
+test_expect_failure \
+    'checking lack of path1/path2/COPYING' \
+    'test -f path1/path2/COPYING'
+
+test_expect_failure \
+    'checking lack of path1/COPYING' \
+    'test -f path1/COPYING'
+
+test_expect_failure \
+    'checking lack of COPYING' \
+    'test -f COPYING'
+
+test_expect_failure \
+    'checking checking lack of path1/COPYING-TOO' \
+    'test -f path0/COPYING-TOO'
+
+test_expect_failure \
+    'checking lack of path1/path2' \
+    'test -d path1/path2'
+
+test_expect_failure \
+    'checking lack of path1' \
+    'test -d path1'
+
+test_done