Consolidate ignore_packed logic more

This refactors three loops that check if a given packfile is on the
ignore_packed list into a function is_kept_pack().  The function returns
false for a pack on the list, and true for a pack not on the list, because
this list is solely used by "git repack" to pass list of packfiles that do
not have corresponding .keep files, i.e. a packfile not on the list is
"kept".

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-pack-objects.c

diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index fb5e14d..7e7719b 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -1915,11 +1915,7 @@
 		const unsigned char *sha1;
 		struct object *o;
 
-		for (i = 0; i < revs->num_ignore_packed; i++) {
-			if (matches_pack_name(p, revs->ignore_packed[i]))
-				break;
-		}
-		if (revs->num_ignore_packed <= i)
+		if (is_kept_pack(p, revs))
 			continue;
 		if (open_pack_index(p))
 			die("cannot open pack index");
@@ -1955,11 +1951,7 @@
 	const unsigned char *sha1;
 
 	for (p = packed_git; p; p = p->next) {
-		for (i = 0; i < revs->num_ignore_packed; i++) {
-			if (matches_pack_name(p, revs->ignore_packed[i]))
-				break;
-		}
-		if (revs->num_ignore_packed <= i)
+		if (is_kept_pack(p, revs))
 			continue;
 
 		if (open_pack_index(p))

cache.h

diff --git a/cache.h b/cache.h
index 8e43f38..23c16d0 100644
--- a/cache.h
+++ b/cache.h
@@ -747,7 +747,6 @@
 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
-extern int matches_pack_name(struct packed_git *p, const char *name);
 
 /* Dumb servers support */
 extern int update_server_info(int);

revision.h

diff --git a/revision.h b/revision.h
index 9304296..af414e5 100644
--- a/revision.h
+++ b/revision.h
@@ -159,5 +159,6 @@
 extern enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit);
 
 extern int has_sha1_kept_pack(const unsigned char *sha1, const struct rev_info *);
+extern int is_kept_pack(const struct packed_git *, const struct rev_info *);
 
 #endif

sha1_file.c

diff --git a/sha1_file.c b/sha1_file.c
index f963c3c..6e0a462 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1858,7 +1858,7 @@
 	return 0;
 }
 
-int matches_pack_name(struct packed_git *p, const char *name)
+static int matches_pack_name(const struct packed_git *p, const char *name)
 {
 	const char *last_c, *c;
 
@@ -1876,6 +1876,17 @@
 	return 0;
 }
 
+int is_kept_pack(const struct packed_git *p, const struct rev_info *revs)
+{
+	int i;
+
+	for (i = 0; i < revs->num_ignore_packed; i++) {
+		if (matches_pack_name(p, revs->ignore_packed[i]))
+			return 0;
+	}
+	return 1;
+}
+
 static int find_pack_ent(const unsigned char *sha1, struct pack_entry *e,
 			 const struct rev_info *revs)
 {
@@ -1889,15 +1900,8 @@
 	p = (last_found == (void *)1) ? packed_git : last_found;
 
 	do {
-		if (revs->ignore_packed) {
-			const char **ig;
-			for (ig = revs->ignore_packed; *ig; ig++)
-				if (matches_pack_name(p, *ig))
-					break;
-			if (*ig)
-				goto next;
-		}
-
+		if (revs->ignore_packed && !is_kept_pack(p, revs))
+			goto next;
 		if (p->num_bad_objects) {
 			unsigned i;
 			for (i = 0; i < p->num_bad_objects; i++)