[PATCH 1/2] refactor exclude handling

[Jeff King <peff@peff.net>]

The excluded function uses the static helper excluded_1 to
perform the inner loop over all of the exclude patterns. The
helper just tells us whether the path is included, excluded,
or undecided.

However, it may be useful to know _which_ pattern was
triggered. So let's pass out the entire exclude match, which
contains the status information we were already passing out.

Further patches can make use of this.

Signed-off-by: Jeff King <peff@peff.net>
---
Just a cleanup for the next patch.

 dir.c |   25 ++++++++++++++-----------
 1 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/dir.c b/dir.c
index cfd1ea5..0ea81b7 100644
--- a/dir.c
+++ b/dir.c
@@ -291,9 +291,10 @@ static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
 }
 
 /* Scan the list and let the last match determines the fate.
- * Return 1 for exclude, 0 for include and -1 for undecided.
+ * Returns the exclude_list element which matched, or NULL for
+ * undecided.
  */
-static int excluded_1(const char *pathname,
+static struct exclude *excluded_1(const char *pathname,
 		      int pathlen, const char *basename, int *dtype,
 		      struct exclude_list *el)
 {
@@ -303,7 +304,6 @@ static int excluded_1(const char *pathname,
 		for (i = el->nr - 1; 0 <= i; i--) {
 			struct exclude *x = el->excludes[i];
 			const char *exclude = x->pattern;
-			int to_exclude = x->to_exclude;
 
 			if (x->flags & EXC_FLAG_MUSTBEDIR) {
 				if (*dtype == DT_UNKNOWN)
@@ -316,14 +316,14 @@ static int excluded_1(const char *pathname,
 				/* match basename */
 				if (x->flags & EXC_FLAG_NOWILDCARD) {
 					if (!strcmp(exclude, basename))
-						return to_exclude;
+						return x;
 				} else if (x->flags & EXC_FLAG_ENDSWITH) {
 					if (x->patternlen - 1 <= pathlen &&
 					    !strcmp(exclude + 1, pathname + pathlen - x->patternlen + 1))
-						return to_exclude;
+						return x;
 				} else {
 					if (fnmatch(exclude, basename, 0) == 0)
-						return to_exclude;
+						return x;
 				}
 			}
 			else {
@@ -342,16 +342,16 @@ static int excluded_1(const char *pathname,
 
 				if (x->flags & EXC_FLAG_NOWILDCARD) {
 					if (!strcmp(exclude, pathname + baselen))
-						return to_exclude;
+						return x;
 				} else {
 					if (fnmatch(exclude, pathname+baselen,
 						    FNM_PATHNAME) == 0)
-					    return to_exclude;
+					    return x;
 				}
 			}
 		}
 	}
-	return -1; /* undecided */
+	return NULL;
 }
 
 int excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
@@ -363,8 +363,11 @@ int excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
 
 	prep_exclude(dir, pathname, basename-pathname);
 	for (st = EXC_CMDL; st <= EXC_FILE; st++) {
-		switch (excluded_1(pathname, pathlen, basename,
-				   dtype_p, &dir->exclude_list[st])) {
+		struct exclude *x = excluded_1(pathname, pathlen, basename,
+					dtype_p, &dir->exclude_list[st]);
+		if (!x)
+			continue;
+		switch (x->to_exclude) {
 		case 0:
 			return 0;
 		case 1:
-- 
1.6.1.2.552.g1682c.dirty