[RFC/PATCH 4/7] ui-shared: use the same snapshot logic as ui-refs

[John Keeping]

Make snapshot links in the commit UI use the same prefix algorithm as
those in the summary UI, so that refs starting with the snapshot prefix
are used as-is rather than composed with the prefix repeated.

Signed-off-by: John Keeping <john at keeping.me.uk>
---
 ui-shared.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/ui-shared.c b/ui-shared.c
index 0375006..588f0bf 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -1114,9 +1114,15 @@ void cgit_print_snapshot_links(const struct cgit_repo *repo, const char *ref)
 {
 	const struct cgit_snapshot_format* f;
 	struct strbuf filename = STRBUF_INIT;
+	const char *basename;
 	size_t prefixlen;
 
-	cgit_compose_snapshot_prefix(&filename, cgit_snapshot_prefix(repo), ref);
+	basename = cgit_snapshot_prefix(repo);
+	if (starts_with(ref, basename))
+		strbuf_addstr(&filename, ref);
+	else
+		cgit_compose_snapshot_prefix(&filename, basename, ref);
+
 	prefixlen = filename.len;
 	for (f = cgit_snapshot_formats; f->suffix; f++) {
 		if (!(repo->snapshots & f->bit))
-- 
2.16.3