1 files changed, 34 insertions, 0 deletions
diff --git a/modules/indexer/internal/paginator.go b/modules/indexer/internal/paginator.go
new file mode 100644
index 0000000..ee204bf
--- /dev/null
+++ b/modules/indexer/internal/paginator.go
@@ -0,0 +1,34 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package internal
+
+import (
+	"math"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+// ParsePaginator parses a db.Paginator into a skip and limit
+func ParsePaginator(paginator *db.ListOptions, max ...int) (int, int) {
+	// Use a very large number to indicate no limit
+	unlimited := math.MaxInt32
+	if len(max) > 0 {
+		// Some indexer engines have a limit on the page size, respect that
+		unlimited = max[0]
+	}
+
+	if paginator == nil || paginator.IsListAll() {
+		// It shouldn't happen. In actual usage scenarios, there should not be requests to search all.
+		// But if it does happen, respect it and return "unlimited".
+		// And it's also useful for testing.
+		return 0, unlimited
+	}
+
+	if paginator.PageSize == 0 {
+		// Do not return any results when searching, it's used to get the total count only.
+		return 0, 0
+	}
+
+	return paginator.GetSkipTake()
+}