feat(renderer): file store with FileNode tree, openTabs, lazy loadChildren

tests/unit/stores/file-store.test.ts

@@ -0,0 +1,283 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { useEditorStore } from '@/stores/editor-store';
+import { useFileStore, FileNode, OpenTab } from '@/stores/file-store';
+import type { FileEntry } from '@/types/ipc';
+
+vi.mock('@/lib/ipc', () => ({
+  ipc: {
+    file: {
+      list: vi.fn(),
+      read: vi.fn(),
+    },
+  },
+}));
+
+import { ipc } from '@/lib/ipc';
+
+const fakeList = ipc.file.list as ReturnType<typeof vi.fn>;
+const fakeRead = ipc.file.read as ReturnType<typeof vi.fn>;
+
+function fakeFileEntry(name: string, isDirectory: boolean): FileEntry {
+  return { name, path: `/root/${name}`, isDirectory };
+}
+
+describe('useFileStore', () => {
+  beforeEach(() => {
+    useFileStore.setState({
+      tree: null,
+      rootPath: null,
+      expanded: new Set(),
+      openTabs: [],
+      activeTabId: null,
+    });
+    useEditorStore.setState({ buffers: new Map(), activeId: null });
+    fakeList.mockClear();
+    fakeRead.mockClear();
+  });
+
+  // --- openFolder ---
+
+  it('openFolder calls ipc.file.list and sets tree with root node and mapped children', async () => {
+    fakeList.mockResolvedValue({
+      ok: true,
+      data: [
+        fakeFileEntry('README.md', false),
+        fakeFileEntry('src', true),
+      ],
+    });
+
+    await useFileStore.getState().openFolder('/root');
+
+    expect(fakeList).toHaveBeenCalledWith('/root');
+    const tree = useFileStore.getState().tree;
+    expect(tree).not.toBeNull();
+    expect(tree!.name).toBe('root');
+    expect(tree!.path).toBe('/root');
+    expect(tree!.isDirectory).toBe(true);
+    expect(tree!.loaded).toBe(true);
+    expect(tree!.children).toHaveLength(2);
+    expect(tree!.children![0].name).toBe('README.md');
+    expect(tree!.children![0].isDirectory).toBe(false);
+    expect(tree!.children![1].name).toBe('src');
+    expect(tree!.children![1].isDirectory).toBe(true);
+    // children of a directory node should be null (lazy)
+    expect(tree!.children![1].children).toBeNull();
+    expect(useFileStore.getState().rootPath).toBe('/root');
+  });
+
+  it('openFolder failure leaves state unchanged', async () => {
+    fakeList.mockResolvedValue({
+      ok: false,
+      error: { code: 'ENOENT', message: 'not found' },
+    });
+
+    await useFileStore.getState().openFolder('/nonexistent');
+    expect(useFileStore.getState().tree).toBeNull();
+    expect(useFileStore.getState().rootPath).toBeNull();
+  });
+
+  // --- loadChildren ---
+
+  it('loadChildren IPC-loads children of the matching directory and sets loaded: true', async () => {
+    fakeList.mockResolvedValue({
+      ok: true,
+      data: [fakeFileEntry('nested.md', false)],
+    });
+
+    // Set up a tree with a loaded parent directory
+    const tree: FileNode = {
+      name: 'root',
+      path: '/root',
+      isDirectory: true,
+      loaded: true,
+      children: [
+        {
+          name: 'src',
+          path: '/root/src',
+          isDirectory: true,
+          children: null,
+          loaded: false,
+        },
+      ],
+    };
+    useFileStore.setState({ tree, rootPath: '/root' });
+
+    await useFileStore.getState().loadChildren('/root/src');
+
+    const srcNode = useFileStore.getState().tree!.children![0];
+    expect(srcNode.loaded).toBe(true);
+    expect(srcNode.children).toHaveLength(1);
+    expect(srcNode.children![0].name).toBe('nested.md');
+  });
+
+  it('loadChildren on a non-directory node is a no-op', async () => {
+    const tree: FileNode = {
+      name: 'root',
+      path: '/root',
+      isDirectory: true,
+      loaded: true,
+      children: [{ name: 'file.md', path: '/root/file.md', isDirectory: false, children: null }],
+    };
+    useFileStore.setState({ tree });
+
+    await useFileStore.getState().loadChildren('/root/file.md');
+    expect(fakeList).not.toHaveBeenCalled();
+  });
+
+  it('loadChildren on a non-existent path is a no-op', async () => {
+    const tree: FileNode = {
+      name: 'root',
+      path: '/root',
+      isDirectory: true,
+      loaded: true,
+      children: [{ name: 'src', path: '/root/src', isDirectory: true, children: null, loaded: true }],
+    };
+    useFileStore.setState({ tree });
+
+    await useFileStore.getState().loadChildren('/root/src/not-there');
+    // Should not throw
+    expect(fakeList).not.toHaveBeenCalled();
+  });
+
+  // --- toggleExpanded ---
+
+  it('toggleExpanded adds and removes paths from the expanded Set', () => {
+    const { toggleExpanded } = useFileStore.getState();
+    toggleExpanded('/root/src');
+    expect(useFileStore.getState().expanded.has('/root/src')).toBe(true);
+    toggleExpanded('/root/src');
+    expect(useFileStore.getState().expanded.has('/root/src')).toBe(false);
+  });
+
+  // --- openFile ---
+
+  it('openFile calls ipc.file.read, opens an editor buffer, adds a tab, and sets it active', async () => {
+    fakeRead.mockResolvedValue({ ok: true, data: '# hello world' });
+
+    await useFileStore.getState().openFile('/root/README.md');
+
+    expect(fakeRead).toHaveBeenCalledWith('/root/README.md');
+    // Editor buffer should be open
+    const buf = useEditorStore.getState().buffers.get('/root/README.md');
+    expect(buf).not.toBeUndefined();
+    expect(buf!.content).toBe('# hello world');
+    expect(buf!.dirty).toBe(false);
+    // Tab should be added and active
+    const tabs = useFileStore.getState().openTabs;
+    expect(tabs).toHaveLength(1);
+    expect(tabs[0].path).toBe('/root/README.md');
+    expect(tabs[0].title).toBe('README.md');
+    expect(tabs[0].dirty).toBe(false);
+    expect(useFileStore.getState().activeTabId).toBe('/root/README.md');
+  });
+
+  it('openFile on an already-open file does not re-read — just activates the existing tab', async () => {
+    fakeRead.mockResolvedValue({ ok: true, data: '# original' });
+
+    // Open once
+    await useFileStore.getState().openFile('/root/README.md');
+    expect(fakeRead).toHaveBeenCalledTimes(1);
+
+    // Mark it dirty to prove dirty flag is preserved
+    useEditorStore.getState().updateContent('/root/README.md', '# modified');
+
+    // Open again
+    await useFileStore.getState().openFile('/root/README.md');
+
+    expect(fakeRead).toHaveBeenCalledTimes(1); // no second read
+    expect(useEditorStore.getState().buffers.get('/root/README.md')!.content).toBe('# modified');
+    expect(useFileStore.getState().openTabs[0].dirty).toBe(true); // dirty flag preserved
+    expect(useFileStore.getState().activeTabId).toBe('/root/README.md');
+  });
+
+  it('openFile failure does nothing', async () => {
+    fakeRead.mockResolvedValue({
+      ok: false,
+      error: { code: 'ENOENT', message: 'not found' },
+    });
+
+    await useFileStore.getState().openFile('/root/missing.md');
+    expect(useFileStore.getState().openTabs).toHaveLength(0);
+    expect(useEditorStore.getState().buffers.size).toBe(0);
+  });
+
+  // --- closeTab ---
+
+  it('closeTab removes the tab and updates activeTabId to the previous neighbor', async () => {
+    fakeRead.mockResolvedValue({ ok: true, data: 'a' });
+    fakeRead.mockResolvedValue({ ok: true, data: 'b' });
+
+    await useFileStore.getState().openFile('/root/a.md');
+    await useFileStore.getState().openFile('/root/b.md');
+
+    // Tab order: [a.md, b.md], active = b.md
+    useFileStore.getState().closeTab('/root/b.md');
+
+    const tabs = useFileStore.getState().openTabs;
+    expect(tabs).toHaveLength(1);
+    expect(tabs[0].id).toBe('/root/a.md');
+    expect(useFileStore.getState().activeTabId).toBe('/root/a.md');
+  });
+
+  it('closeTab on the active tab when it is the only tab sets activeTabId to null', async () => {
+    fakeRead.mockResolvedValue({ ok: true, data: '# only' });
+    await useFileStore.getState().openFile('/root/only.md');
+
+    useFileStore.getState().closeTab('/root/only.md');
+
+    expect(useFileStore.getState().openTabs).toHaveLength(0);
+    expect(useFileStore.getState().activeTabId).toBeNull();
+  });
+
+  // --- setActiveTab ---
+
+  it('setActiveTab updates activeTabId', async () => {
+    fakeRead.mockResolvedValue({ ok: true, data: 'a' });
+    fakeRead.mockResolvedValue({ ok: true, data: 'b' });
+
+    await useFileStore.getState().openFile('/root/a.md');
+    await useFileStore.getState().openFile('/root/b.md');
+    useFileStore.getState().setActiveTab('/root/a.md');
+
+    expect(useFileStore.getState().activeTabId).toBe('/root/a.md');
+  });
+
+  // --- markTabClean / markTabDirty ---
+
+  it('markTabClean sets dirty to false on the matching tab', async () => {
+    fakeRead.mockResolvedValue({ ok: true, data: '# doc' });
+    await useFileStore.getState().openFile('/root/doc.md');
+    useEditorStore.getState().updateContent('/root/doc.md', '# changed');
+
+    useFileStore.getState().markTabClean('/root/doc.md');
+
+    expect(useFileStore.getState().openTabs[0].dirty).toBe(false);
+  });
+
+  it('markTabDirty sets dirty to true on the matching tab', async () => {
+    fakeRead.mockResolvedValue({ ok: true, data: '# doc' });
+    await useFileStore.getState().openFile('/root/doc.md');
+
+    useFileStore.getState().markTabDirty('/root/doc.md');
+
+    expect(useFileStore.getState().openTabs[0].dirty).toBe(true);
+  });
+
+  // --- reorderTabs ---
+
+  it('reorderTabs moves a tab from one index to another', async () => {
+    fakeRead.mockResolvedValue({ ok: true, data: 'a' });
+    fakeRead.mockResolvedValue({ ok: true, data: 'b' });
+    fakeRead.mockResolvedValue({ ok: true, data: 'c' });
+
+    await useFileStore.getState().openFile('/root/a.md');
+    await useFileStore.getState().openFile('/root/b.md');
+    await useFileStore.getState().openFile('/root/c.md');
+
+    // [a, b, c] — move c to front
+    useFileStore.getState().reorderTabs(2, 0);
+
+    const tabs = useFileStore.getState().openTabs;
+    expect(tabs.map((t) => t.title)).toEqual(['c.md', 'a.md', 'b.md']);
+  });
+});