In a similar way to the previous commit, this extracts a new helper
function last_exclude_matching() which returns the last exclude_list
element which matched, or NULL if no match was found.  is_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 <g...@adamspiers.org>
---
 dir.c | 38 +++++++++++++++++++++++++++++---------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/dir.c b/dir.c
index 70b7d7e..3e2161e 100644
--- a/dir.c
+++ b/dir.c
@@ -606,24 +606,44 @@ int is_excluded_from_list(const char *pathname,
        return -1; /* undecided */
 }
 
-static int is_excluded(struct dir_struct *dir, const char *pathname, int 
*dtype_p)
+/*
+ * Loads the exclude lists for the directory containing pathname, then
+ * scans all exclude lists to determine whether pathname is excluded.
+ * Returns the exclude_list element which matched, or NULL for
+ * undecided.
+ */
+static struct exclude *last_exclude_matching(struct dir_struct *dir,
+                                            const char *pathname,
+                                            int *dtype_p)
 {
        int pathlen = strlen(pathname);
        int st;
+       struct exclude *exclude;
        const char *basename = strrchr(pathname, '/');
        basename = (basename) ? basename+1 : pathname;
 
        prep_exclude(dir, pathname, basename-pathname);
        for (st = EXC_CMDL; st <= EXC_FILE; st++) {
-               switch (is_excluded_from_list(pathname, pathlen,
-                                             basename, dtype_p,
-                                             &dir->exclude_list[st])) {
-               case 0:
-                       return 0;
-               case 1:
-                       return 1;
-               }
+               exclude = last_exclude_matching_from_list(
+                       pathname, pathlen, basename, dtype_p,
+                       &dir->exclude_list[st]);
+               if (exclude)
+                       return exclude;
        }
+       return NULL;
+}
+
+/*
+ * Loads the exclude lists for the directory containing pathname, then
+ * scans all exclude lists to determine whether pathname is excluded.
+ * Returns 1 if true, otherwise 0.
+ */
+static int is_excluded(struct dir_struct *dir, const char *pathname, int 
*dtype_p)
+{
+       struct exclude *exclude =
+               last_exclude_matching(dir, pathname, dtype_p);
+       if (exclude)
+               return exclude->to_exclude;
        return 0;
 }
 
-- 
1.7.12.147.g6d168f4

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