fixes

website/src/lib/engine/workspace.test.ts

@@ -6,6 +6,7 @@ import {
     folderName,
     isWithin,
     parentOf,
+    relocated,
     subfolder,
 } from '$lib/engine/workspace';
 
@@ -62,6 +63,14 @@ describe('parentOf', () => {
     });
 });
 
+describe('relocated', () => {
+    it('is where a path is once moved or renamed', () => {
+        assert.equal(relocated('/me/tracks/a.gpx', '/me/trips'), '/me/trips/a.gpx');
+        assert.equal(relocated('/me/tracks', '/me', 'rides'), '/me/rides');
+        assert.equal(relocated('C:\\me\\tracks', 'C:\\me', 'rides'), 'C:\\me\\rides');
+    });
+});
+
 describe('isWithin', () => {
     it('is the folder itself or what is in it', () => {
         assert.ok(isWithin('/home/me/tracks', '/home/me/tracks'));

website/src/lib/engine/workspace.ts

@@ -41,6 +41,12 @@ export function parentOf(path: string): string {
     return index > 0 ? path.slice(0, index) : path;
 }
 
+/** Where `path` is once moved into `folder`, renamed `name` if it is given. */
+export function relocated(path: string, folder: string, name?: string): string {
+    const parent = parentOf(path);
+    return `${folder}${path[parent.length]}${name ?? path.slice(parent.length + 1)}`;
+}
+
 /** Whether `path` is `folder` or something in it. */
 export function isWithin(path: string, folder: string): boolean {
     return path === folder || (path.startsWith(folder) && /[\\/]/.test(path[folder.length]));