fetch-pack: output refs in the order they were given on the command l…

…ine.

Currently, fetched refs are output in the order the remote side
happened to send them.  This changes the order to match the
order of refs that were given on the command line.  To the
existing core callers (git-fetch and git-clone) this does not
make any difference, but for other Porcelain use, it would be
more intuitive.

Signed-off-by: Junio C Hamano <junkio@cox.net>

connect.c

@@ -100,7 +100,7 @@ int path_match(const char *path, int nr, char **match)
 		if (pathlen > len && path[pathlen - len - 1] != '/')
 			continue;
 		*s = 0;
-		return 1;
+		return (i + 1);
 	}
 	return 0;
 }

fetch-pack.c

@@ -262,22 +262,58 @@ static void mark_recent_complete_commits(unsigned long cutoff)
 
 static void filter_refs(struct ref **refs, int nr_match, char **match)
 {
-	struct ref *prev, *current, *next;
-
-	for (prev = NULL, current = *refs; current; current = next) {
-		next = current->next;
-		if ((!memcmp(current->name, "refs/", 5) &&
-		     check_ref_format(current->name + 5)) ||
-		    (!fetch_all &&
-		     !path_match(current->name, nr_match, match))) {
-			if (prev == NULL)
-				*refs = next;
-			else
-				prev->next = next;
-			free(current);
-		} else
-			prev = current;
+	struct ref **return_refs;
+	struct ref *newlist = NULL;
+	struct ref **newtail = &newlist;
+	struct ref *ref, *next;
+	struct ref *fastarray[32];
+
+	if (nr_match && !fetch_all) {
+		if (ARRAY_SIZE(fastarray) < nr_match)
+			return_refs = xcalloc(nr_match, sizeof(struct ref *));
+		else {
+			return_refs = fastarray;
+			memset(return_refs, 0, sizeof(struct ref *) * nr_match);
+		}
+	}
+	else
+		return_refs = NULL;
+
+	for (ref = *refs; ref; ref = next) {
+		next = ref->next;
+		if (!memcmp(ref->name, "refs/", 5) &&
+		    check_ref_format(ref->name + 5))
+			; /* trash */
+		else if (fetch_all) {
+			*newtail = ref;
+			ref->next = NULL;
+			newtail = &ref->next;
+			continue;
+		}
+		else {
+			int order = path_match(ref->name, nr_match, match);
+			if (order) {
+				return_refs[order-1] = ref;
+				continue; /* we will link it later */
+			}
+		}
+		free(ref);
+	}
+
+	if (!fetch_all) {
+		int i;
+		for (i = 0; i < nr_match; i++) {
+			ref = return_refs[i];
+			if (ref) {
+				*newtail = ref;
+				ref->next = NULL;
+				newtail = &ref->next;
+			}
+		}
+		if (return_refs != fastarray)
+			free(return_refs);
 	}
+	*refs = newlist;
 }
 
 static int everything_local(struct ref **refs, int nr_match, char **match)