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MAESTRO: Document and test file rename handling in Document Graph
Verified that file renames are handled gracefully by the existing debouncing architecture. Chokidar emits unlink + add events for renames (by design), which are batched within the 500ms debounce window. The graph rebuild correctly removes the old node and adds the new node with smooth animations. Added comprehensive documentation explaining the rename handling flow and 9 new tests covering various rename scenarios including cross-directory moves, multiple concurrent renames, and case-only renames on macOS.
This commit is contained in:
Pedram Amini
@@ -486,4 +486,315 @@ describe('Document Graph File Watcher', () => {
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expect(DOCUMENT_GRAPH_DEBOUNCE).toBe(500);
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});
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});
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/**
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* File Rename Handling Tests
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*
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* Chokidar does not emit a native "rename" event. Instead, file renames are
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* reported as two separate events:
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* 1. 'unlink' for the old file path
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* 2. 'add' for the new file path
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*
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* The Document Graph handles renames gracefully because:
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* - Both events are batched together within the 500ms debounce window
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* - The renderer receives both events in a single batch
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* - The graph rebuild treats this as "remove old node, add new node"
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* - Position preservation ensures the new node appears in a sensible location
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*
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* See: https://github.com/paulmillr/chokidar/issues/303
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*/
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describe('File rename handling (unlink + add)', () => {
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it('should batch unlink and add events when file is renamed', () => {
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const events: Array<{ rootPath: string; changes: Array<{ filePath: string; eventType: string }> }> = [];
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const DEBOUNCE_MS = 500;
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const debounceTimers = new Map<string, NodeJS.Timeout>();
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const pendingEvents = new Map<string, Map<string, 'add' | 'change' | 'unlink'>>();
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const rootPath = '/project';
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const processPendingEvents = (path: string) => {
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const pending = pendingEvents.get(path);
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if (!pending || pending.size === 0) return;
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const changes: Array<{ filePath: string; eventType: string }> = [];
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for (const [filePath, eventType] of pending) {
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changes.push({ filePath, eventType });
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}
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events.push({ rootPath: path, changes });
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pending.clear();
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};
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const queueEvent = (path: string, filePath: string, eventType: 'add' | 'change' | 'unlink') => {
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if (!pendingEvents.has(path)) {
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pendingEvents.set(path, new Map());
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}
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pendingEvents.get(path)!.set(filePath, eventType);
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const existingTimer = debounceTimers.get(path);
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if (existingTimer) {
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clearTimeout(existingTimer);
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}
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const timer = setTimeout(() => {
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debounceTimers.delete(path);
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processPendingEvents(path);
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}, DEBOUNCE_MS);
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debounceTimers.set(path, timer);
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};
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// Simulate file rename: old-name.md -> new-name.md
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// Chokidar emits these as separate events, typically in quick succession
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queueEvent(rootPath, '/project/old-name.md', 'unlink');
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queueEvent(rootPath, '/project/new-name.md', 'add');
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// No events yet (still debouncing)
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expect(events).toHaveLength(0);
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// Advance past debounce time
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vi.advanceTimersByTime(DEBOUNCE_MS + 50);
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// Both events should be batched together in a single event
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expect(events).toHaveLength(1);
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expect(events[0].changes).toHaveLength(2);
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// Verify both old (unlink) and new (add) paths are included
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const unlinkEvent = events[0].changes.find(c => c.eventType === 'unlink');
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const addEvent = events[0].changes.find(c => c.eventType === 'add');
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expect(unlinkEvent).toBeDefined();
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expect(unlinkEvent?.filePath).toBe('/project/old-name.md');
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expect(addEvent).toBeDefined();
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expect(addEvent?.filePath).toBe('/project/new-name.md');
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});
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it('should handle rename with order: add before unlink', () => {
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// Sometimes chokidar emits 'add' before 'unlink' depending on OS/timing
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const pendingEvents = new Map<string, Map<string, 'add' | 'change' | 'unlink'>>();
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const rootPath = '/project';
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const queueEvent = (path: string, filePath: string, eventType: 'add' | 'change' | 'unlink') => {
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if (!pendingEvents.has(path)) {
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pendingEvents.set(path, new Map());
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}
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pendingEvents.get(path)!.set(filePath, eventType);
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};
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// Simulate add arriving before unlink
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queueEvent(rootPath, '/project/new-name.md', 'add');
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queueEvent(rootPath, '/project/old-name.md', 'unlink');
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const pending = pendingEvents.get(rootPath)!;
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expect(pending.size).toBe(2);
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expect(pending.get('/project/new-name.md')).toBe('add');
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expect(pending.get('/project/old-name.md')).toBe('unlink');
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});
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it('should handle rename within same directory', () => {
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const pendingEvents = new Map<string, Map<string, 'add' | 'change' | 'unlink'>>();
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const rootPath = '/project';
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const queueEvent = (path: string, filePath: string, eventType: 'add' | 'change' | 'unlink') => {
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if (!pendingEvents.has(path)) {
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pendingEvents.set(path, new Map());
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}
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pendingEvents.get(path)!.set(filePath, eventType);
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};
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// Rename: README.md -> CONTRIBUTING.md in same folder
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queueEvent(rootPath, '/project/README.md', 'unlink');
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queueEvent(rootPath, '/project/CONTRIBUTING.md', 'add');
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const pending = pendingEvents.get(rootPath)!;
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expect(pending.size).toBe(2);
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});
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it('should handle rename that moves file to different directory', () => {
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const pendingEvents = new Map<string, Map<string, 'add' | 'change' | 'unlink'>>();
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const rootPath = '/project';
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const queueEvent = (path: string, filePath: string, eventType: 'add' | 'change' | 'unlink') => {
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if (!pendingEvents.has(path)) {
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pendingEvents.set(path, new Map());
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}
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pendingEvents.get(path)!.set(filePath, eventType);
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};
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// Move: docs/guide.md -> archive/old-guide.md
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queueEvent(rootPath, '/project/docs/guide.md', 'unlink');
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queueEvent(rootPath, '/project/archive/old-guide.md', 'add');
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const pending = pendingEvents.get(rootPath)!;
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expect(pending.size).toBe(2);
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expect(pending.has('/project/docs/guide.md')).toBe(true);
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expect(pending.has('/project/archive/old-guide.md')).toBe(true);
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});
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it('should handle multiple renames in quick succession', () => {
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const events: Array<{ rootPath: string; changes: Array<{ filePath: string; eventType: string }> }> = [];
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const DEBOUNCE_MS = 500;
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const debounceTimers = new Map<string, NodeJS.Timeout>();
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const pendingEvents = new Map<string, Map<string, 'add' | 'change' | 'unlink'>>();
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const rootPath = '/project';
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const processPendingEvents = (path: string) => {
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const pending = pendingEvents.get(path);
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if (!pending || pending.size === 0) return;
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const changes: Array<{ filePath: string; eventType: string }> = [];
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for (const [filePath, eventType] of pending) {
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changes.push({ filePath, eventType });
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}
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events.push({ rootPath: path, changes });
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pending.clear();
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};
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const queueEvent = (path: string, filePath: string, eventType: 'add' | 'change' | 'unlink') => {
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if (!pendingEvents.has(path)) {
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pendingEvents.set(path, new Map());
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}
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pendingEvents.get(path)!.set(filePath, eventType);
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const existingTimer = debounceTimers.get(path);
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if (existingTimer) {
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clearTimeout(existingTimer);
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}
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const timer = setTimeout(() => {
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debounceTimers.delete(path);
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processPendingEvents(path);
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}, DEBOUNCE_MS);
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debounceTimers.set(path, timer);
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};
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// Rename file1.md -> file1-renamed.md
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queueEvent(rootPath, '/project/file1.md', 'unlink');
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queueEvent(rootPath, '/project/file1-renamed.md', 'add');
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// Rename file2.md -> file2-renamed.md
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queueEvent(rootPath, '/project/file2.md', 'unlink');
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queueEvent(rootPath, '/project/file2-renamed.md', 'add');
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// All events should be batched
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vi.advanceTimersByTime(DEBOUNCE_MS + 50);
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expect(events).toHaveLength(1);
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expect(events[0].changes).toHaveLength(4); // 2 unlinks + 2 adds
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});
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it('should handle rename followed by content change', () => {
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const pendingEvents = new Map<string, Map<string, 'add' | 'change' | 'unlink'>>();
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const rootPath = '/project';
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const queueEvent = (path: string, filePath: string, eventType: 'add' | 'change' | 'unlink') => {
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if (!pendingEvents.has(path)) {
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pendingEvents.set(path, new Map());
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}
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pendingEvents.get(path)!.set(filePath, eventType);
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};
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// Rename: old.md -> new.md, then modify new.md
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queueEvent(rootPath, '/project/old.md', 'unlink');
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queueEvent(rootPath, '/project/new.md', 'add');
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queueEvent(rootPath, '/project/new.md', 'change'); // Modify the newly renamed file
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const pending = pendingEvents.get(rootPath)!;
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// The new file should show 'change' (last event wins for same file)
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expect(pending.get('/project/new.md')).toBe('change');
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expect(pending.get('/project/old.md')).toBe('unlink');
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});
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it('should handle case-only rename (macOS case-insensitive)', () => {
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// On macOS with case-insensitive filesystem, renaming "readme.md" to "README.md"
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// may be reported as a rename (unlink + add) or just a change, depending on the scenario
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const pendingEvents = new Map<string, Map<string, 'add' | 'change' | 'unlink'>>();
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const rootPath = '/project';
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const queueEvent = (path: string, filePath: string, eventType: 'add' | 'change' | 'unlink') => {
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if (!pendingEvents.has(path)) {
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pendingEvents.set(path, new Map());
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}
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pendingEvents.get(path)!.set(filePath, eventType);
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};
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// Case-only rename: readme.md -> README.md
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queueEvent(rootPath, '/project/readme.md', 'unlink');
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queueEvent(rootPath, '/project/README.md', 'add');
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const pending = pendingEvents.get(rootPath)!;
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// Both events should be tracked as separate file paths
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expect(pending.size).toBe(2);
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});
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it('should correctly rebuild graph after rename (simulated flow)', () => {
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// This test simulates the full flow of a file rename through the system
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interface SimulatedNode {
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id: string;
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filePath: string;
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}
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// Initial graph state
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const initialNodes: SimulatedNode[] = [
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{ id: 'doc-old-name.md', filePath: '/project/old-name.md' },
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{ id: 'doc-other.md', filePath: '/project/other.md' },
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];
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// After rename: old-name.md -> new-name.md
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// The graph would be rebuilt by re-scanning the directory
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const newNodes: SimulatedNode[] = [
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{ id: 'doc-new-name.md', filePath: '/project/new-name.md' },
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{ id: 'doc-other.md', filePath: '/project/other.md' },
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];
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// Diff the nodes (like diffNodes in layoutAlgorithms.ts)
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const oldIds = new Set(initialNodes.map(n => n.id));
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const newIds = new Set(newNodes.map(n => n.id));
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const added = newNodes.filter(n => !oldIds.has(n.id));
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const removed = initialNodes.filter(n => !newIds.has(n.id));
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const unchanged = newNodes.filter(n => oldIds.has(n.id));
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// The renamed file should appear as: 1 removal + 1 addition
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expect(removed).toHaveLength(1);
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expect(removed[0].id).toBe('doc-old-name.md');
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expect(added).toHaveLength(1);
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expect(added[0].id).toBe('doc-new-name.md');
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// The other file should be unchanged
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expect(unchanged).toHaveLength(1);
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expect(unchanged[0].id).toBe('doc-other.md');
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});
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it('should preserve positions for unchanged nodes after rename', () => {
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// When a file is renamed, other nodes should keep their positions
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interface SimulatedNode {
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id: string;
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position: { x: number; y: number };
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}
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const previousNodes: SimulatedNode[] = [
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{ id: 'doc-old-name.md', position: { x: 100, y: 100 } },
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{ id: 'doc-other.md', position: { x: 200, y: 200 } },
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{ id: 'doc-another.md', position: { x: 300, y: 300 } },
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];
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// After rename, rebuild graph with new node IDs
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const newNodeIds = ['doc-new-name.md', 'doc-other.md', 'doc-another.md'];
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// Simulate position restoration logic
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const previousPositions = new Map(previousNodes.map(n => [n.id, n.position]));
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const newNodes = newNodeIds.map(id => ({
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id,
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// Unchanged nodes get their old position, new nodes get default
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position: previousPositions.get(id) || { x: 0, y: 0 },
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}));
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// Unchanged nodes should preserve position
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expect(newNodes.find(n => n.id === 'doc-other.md')?.position).toEqual({ x: 200, y: 200 });
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expect(newNodes.find(n => n.id === 'doc-another.md')?.position).toEqual({ x: 300, y: 300 });
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// New node (renamed) gets default position (to be placed by layout algorithm)
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expect(newNodes.find(n => n.id === 'doc-new-name.md')?.position).toEqual({ x: 0, y: 0 });
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});
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});
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});
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@@ -37,6 +37,25 @@ export interface DocumentGraphHandlerDependencies {
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* - Watch a directory for markdown file changes
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* - Stop watching a directory
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* - Debounced notifications to prevent UI thrashing
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*
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* ## File Rename Handling
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*
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* Chokidar does not emit native "rename" events. File renames are reported as
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* two separate events: 'unlink' (old path) + 'add' (new path).
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* See: https://github.com/paulmillr/chokidar/issues/303
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*
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* This is handled gracefully by the debouncing mechanism:
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* 1. Both 'unlink' and 'add' events are queued within the 500ms debounce window
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* 2. After debounce, a single batched event is sent to the renderer
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* 3. The renderer triggers a graph rebuild which re-scans the directory
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* 4. The graph's diff-based animation removes the old node and adds the new node
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* 5. Position preservation ensures unchanged nodes keep their positions
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*
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* This approach works correctly for:
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* - Simple renames (file.md -> renamed.md)
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* - Move operations (docs/file.md -> archive/file.md)
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* - Case-only renames on case-insensitive filesystems (readme.md -> README.md)
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* - Multiple concurrent renames
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*/
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export function registerDocumentGraphHandlers(deps: DocumentGraphHandlerDependencies): void {
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const { getMainWindow, app } = deps;
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