fix import with -p0

mercurial/patch.py

@@ -789,7 +789,7 b' def selectfile(afile_orig, bfile_orig, h'
         pathlen = len(path)
         i = 0
         if count == 0:
-            return path.rstrip()
+            return '', path.rstrip()
         while count > 0:
             i = path.find('/', i)
             if i == -1:

tests/test-import

@@ -244,3 +244,20 b' echo % view a2'
 # and a2 should have duplicated it
 cat a2
 cd ..
+
+echo % 'test -p0'
+hg init p0
+cd p0
+echo a > a
+hg ci -Am t
+hg import -p0 - << EOF
+foobar
+--- a	Sat Apr 12 22:43:58 2008 -0400
++++ a	Sat Apr 12 22:44:05 2008 -0400
+@@ -1,1 +1,1 @@
+-a
++bb
+EOF
+hg status
+cat a
+cd ..

tests/test-import.out

@@ -256,3 +256,7 b' applying copy.diff'
 a
 % view a2
 a
+% test -p0
+adding a
+applying patch from stdin
+bb