// ── Path helpers ──
// Pure functions only: no 'obsidian' imports, so this stays unit-testable in plain node.

/**
 * Remap a stored vault path after a rename.
 *
 * Obsidian's `vault.on('rename')` fires for folders as well as files, so a
 * stored path can be affected either because it *is* the renamed item or
 * because it lives inside a renamed folder.
 *
 * The nested check requires a `/` boundary, so renaming `notes/foo` leaves
 * `notes/foobar.md` untouched.
 *
 * @returns the updated path, or `null` when `path` is unaffected.
 */
export function remapRenamedPath(path: string, oldPath: string, newPath: string): string | null {
	if (!path || !oldPath) return null;
	if (path === oldPath) return newPath;
	if (path.startsWith(oldPath + '/')) return newPath + path.slice(oldPath.length);
	return null;
}