From bdd3af7c6ab23ecb8fc377b3404282793eb9c802 Mon Sep 17 00:00:00 2001
From: Bryce Kwon <bryce@brycekwon.com>
Date: Sun, 1 Nov 2026 16:10:49 -1000
Subject: Say when nothing matches a mistyped url

---
 source/ui-repolist.c | 24 +++++++++++++++++++++++-
 tests/t0101-index.sh | 11 +++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/source/ui-repolist.c b/source/ui-repolist.c
index 87abf0b..3eb9375 100644
--- a/source/ui-repolist.c
+++ b/source/ui-repolist.c
@@ -169,6 +169,23 @@ static int any_repos_visible(void)
 	return 0;
 }
 
+/*
+ * Whether any listed repository lies under the url the request carried,
+ * whatever the search terms.
+ */
+static int any_repos_under_url(void)
+{
+	int i;
+
+	for (i = 0; i < cgit_repolist.count; i++) {
+		struct cgit_repo *repo = &cgit_repolist.repos[i];
+
+		if (!repo->hide && !repo->ignore && matches_url(repo))
+			return 1;
+	}
+	return 0;
+}
+
 /*
  * currenturl is passed in because it is the same for every heading and every
  * row, and working it out here would mean an allocation and a free per cell.
@@ -398,7 +415,12 @@ void cgit_print_repolist(void)
 			cgit_read_repo_desc(&cgit_repolist.repos[i]);
 
 	if (!any_repos_visible()) {
-		cgit_print_error_page(404, "Not Found", "No repositories found");
+		// A url naming no repository or page lands here, as a prefix
+		// that no repository's url starts with.
+		if (ctx.qry.url && *ctx.qry.url && !any_repos_under_url())
+			cgit_print_error_page(404, "Not Found", "Nothing matches this url");
+		else
+			cgit_print_error_page(404, "Not Found", "No repositories found");
 		return;
 	}
 
diff --git a/tests/t0101-index.sh b/tests/t0101-index.sh
index 0953b8d..fcf873b 100755
--- a/tests/t0101-index.sh
+++ b/tests/t0101-index.sh
@@ -53,6 +53,17 @@ test_expect_success 'a cut description keeps whole characters' '
 	grep ">日本語\.\.\.</a>" tmp
 '
 
+# A url naming no repository falls through to the index as a prefix that
+# matches none, which is not the same as a search finding nothing.
+test_expect_success 'a url matching no repository says so' '
+	cgit_url "nonexistent/tree/" >tmp &&
+	grep "^Status: 404" tmp &&
+	grep "<div class=.error.>Nothing matches this url</div>" tmp &&
+	cgit_query "q=nonexistent" >tmp &&
+	grep "^Status: 404" tmp &&
+	grep "<div class=.error.>No repositories found</div>" tmp
+'
+
 # The index sorts by a column only when asked, which nothing else exercises.
 test_expect_success 'the index sorts by a column on request' '
 	cgit_query "s=name" >tmp &&
-- 
cgit 2.12.1