directory back up (parent) button + drag entry into parent to move

frontend/utils/files.ts

@@ -0,0 +1,49 @@
+import { moveFile } from '~/lib/api/warrens';
+import type { DirectoryEntry } from '~/shared/types';
+
+export function getParentPath(path: string): string {
+    const sliceEnd = Math.max(1, path.lastIndexOf('/'));
+    return path.slice(0, sliceEnd);
+}
+
+export function onDirectoryEntryDrop(
+    entry: DirectoryEntry,
+    isParent: boolean = false
+): (e: DragEvent) => void {
+    return async (e: DragEvent) => {
+        const warrenStore = useWarrenStore();
+
+        if (e.dataTransfer == null || warrenStore.current == null) {
+            return;
+        }
+
+        if (entry.fileType !== 'directory') {
+            return;
+        }
+
+        const fileName = e.dataTransfer.getData('application/warren');
+
+        if (entry.name === fileName) {
+            return;
+        }
+
+        let targetPath: string;
+
+        if (isParent) {
+            targetPath = getParentPath(warrenStore.current.path);
+        } else {
+            targetPath = warrenStore.current.path;
+            if (!targetPath.endsWith('/')) {
+                targetPath += '/';
+            }
+            targetPath += entry.name;
+        }
+
+        await moveFile(
+            warrenStore.current.warrenId,
+            warrenStore.current.path,
+            fileName,
+            targetPath
+        );
+    };
+}