[PATCH v2] refs: use skip_prefix() in ref_is_hidden()

[Christian Couder <christian.couder@gmail.com>]

This is shorter, makes the logic a bit easier to follow, and is
perhaps a bit faster too.

The logic is to make the final decision only when "subject" is there,
its early part matches "match", and the match is at the slash
boundary (or the whole thing).

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---

The change with the previous version was suggested by Junio in

https://public-inbox.org/git/xmqqk231hgpz.fsf@gitster.mtv.corp.google.com/

 refs.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/refs.c b/refs.c
index ba22f4acef..ea2b9f84f8 100644
--- a/refs.c
+++ b/refs.c
@@ -1160,7 +1160,7 @@ int ref_is_hidden(const char *refname, const char *refname_full)
 		const char *match = hide_refs->items[i].string;
 		const char *subject;
 		int neg = 0;
-		int len;
+		const char *p;
 
 		if (*match == '!') {
 			neg = 1;
@@ -1175,10 +1175,9 @@ int ref_is_hidden(const char *refname, const char *refname_full)
 		}
 
 		/* refname can be NULL when namespaces are used. */
-		if (!subject || !starts_with(subject, match))
-			continue;
-		len = strlen(match);
-		if (!subject[len] || subject[len] == '/')
+		if (subject &&
+		    skip_prefix(subject, match, &p) &&
+		    (!*p || *p == '/'))
 			return !neg;
 	}
 	return 0;
-- 
2.14.0.rc0.26.g981adb928e.dirty