dir.c: refactor is_path_excluded()

In a similar way to the previous commit, this extracts a new helper
function last_exclude_matching_path() which return the last
exclude_list element which matched, or NULL if no match was found.
is_path_excluded() becomes a wrapper around this, and just returns 0
or 1 depending on whether any matching exclude_list element was found.

This allows callers to find out _why_ a given path was excluded,
rather than just whether it was or not, paving the way for a new git
sub-command which allows users to test their exclude lists from the
command line.

Signed-off-by: Adam Spiers <git@adamspiers.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/dir.h b/dir.h
index d68a9971c2..dcb1ad3d3a 100644
--- a/dir.h
+++ b/dir.h
@@ -119,10 +119,13 @@ extern int match_pathname(const char *, int,
  */
 struct path_exclude_check {
 	struct dir_struct *dir;
+	struct exclude *exclude;
 	struct strbuf path;
 };
 extern void path_exclude_check_init(struct path_exclude_check *, struct dir_struct *);
 extern void path_exclude_check_clear(struct path_exclude_check *);
+extern struct exclude *last_exclude_matching_path(struct path_exclude_check *, const char *,
+						  int namelen, int *dtype);
 extern int is_path_excluded(struct path_exclude_check *, const char *, int namelen, int *dtype);