delete multiple files with selection

frontend/utils/selection.ts

@@ -0,0 +1,17 @@
+import type { DirectoryEntry } from '~/shared/types';
+
+/** Converts a selection and the entry that triggered an action into the target entries
+ * @param targetEntry - The entry that triggered an action
+ * @param selection - The selected entries
+ * @returns If there are no selected elements or the target was not included only the target is returned. Otherwise the selection is returned
+ */
+export function getTargetsFromSelection(
+    targetEntry: DirectoryEntry,
+    selection: Set<DirectoryEntry>
+): DirectoryEntry[] {
+    if (selection.size === 0 || !selection.has(targetEntry)) {
+        return [targetEntry];
+    }
+
+    return Array.from(selection);
+}