Allow `batch-mark-files-as-viewed` to mark all files from first (#5587)

Co-authored-by: cheap-glitch <cheap.glitch@gmail.com>
Co-authored-by: Federico Brigante <me@fregante.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/source/helpers/get-items-between.ts b/source/helpers/get-items-between.ts
new file mode 100644
index 00000000..75221535
--- /dev/null
+++ b/source/helpers/get-items-between.ts
@@ -0,0 +1,9 @@
+/**
+Get the items between previous and current, both ends included. If `previous` is missing, start from 0
+*/
+export default function getItemsBetween<T>(items: T[], previous: T | undefined, current: T): T[] {
+	const start = previous ? items.indexOf(previous) : 0;
+	const end = items.indexOf(current);
+
+	return items.slice(Math.min(start, end), Math.max(start, end) + 1);
+}