feat: 优化桌面文件默认保存路径

apps/desktop/src/desktop-application-controller.ts

@@ -75,6 +75,7 @@ import {
   type WindowState
 } from "./window-state.js";
 import { getWindowCloseDecision } from "./window-close-policy.js";
+import { SaveLocationStore } from "./save-location-state.js";
 
 const DEFAULT_WINDOW_SIZE = { width: 1440, height: 960 };
 const MINIMUM_WINDOW_SIZE = { width: 1024, height: 720 };
@@ -113,6 +114,8 @@ export interface DesktopApplicationControllerOptions {
   iconPath: string;
   themeDirectory: string;
   windowStatePath: string;
+  saveLocationStatePath: string;
+  documentsDirectory: string;
 }
 
 function focusWindow(window: BrowserWindow) {
@@ -134,6 +137,7 @@ export class DesktopApplicationController {
   readonly #iconPath: string;
   readonly #themeDirectory: string;
   readonly #windowStatePath: string;
+  readonly #saveLocationStore: SaveLocationStore;
   readonly #pdfGenerator: ElectronPdfGenerator;
   readonly #docxExportService: DocxExportService;
   readonly #docxMediaEngine: ElectronDocxMediaEngine;
@@ -153,6 +157,10 @@ export class DesktopApplicationController {
     this.#iconPath = options.iconPath;
     this.#themeDirectory = options.themeDirectory;
     this.#windowStatePath = options.windowStatePath;
+    this.#saveLocationStore = new SaveLocationStore(
+      options.saveLocationStatePath,
+      options.documentsDirectory
+    );
     this.#pdfGenerator = new ElectronPdfGenerator({
       renderUrl: options.renderUrl,
       preloadPath: options.pdfPreloadPath
@@ -181,12 +189,22 @@ export class DesktopApplicationController {
   }
 
   async initialize() {
-    this.#savedWindowState = await loadWindowState(
-      this.#windowStatePath
-    );
+    const [savedWindowState] = await Promise.all([
+      loadWindowState(this.#windowStatePath),
+      this.#saveLocationStore.initialize()
+    ]);
+    this.#savedWindowState = savedWindowState;
     this.#registerIpcHandlers();
   }
 
+  async #recordSuccessfulFile(filePath: string) {
+    await this.#saveLocationStore
+      .recordSuccessfulFile(filePath)
+      .catch((error: unknown) => {
+        console.warn("无法持久化最近保存目录", error);
+      });
+  }
+
   async createWindow(filePath?: string) {
     let pendingSnapshot: MarkdownFileSnapshot | undefined;
     if (filePath) {
@@ -733,9 +751,10 @@ export class DesktopApplicationController {
               ? "另存为 Markdown"
               : "保存 Markdown",
             defaultPath:
-              forceSaveAs && session.currentFilePath
-                ? session.currentFilePath
-                : path.join(app.getPath("documents"), suggestedName),
+              await this.#saveLocationStore.resolveDefaultPath(
+                session.currentFilePath,
+                suggestedName
+              ),
             filters: [
               {
                 name: "Markdown 文件",
@@ -788,6 +807,7 @@ export class DesktopApplicationController {
           throw new Error("该 Markdown 已在另一个窗口中打开");
         }
         this.#commitSnapshot(session, snapshot);
+        await this.#recordSuccessfulFile(targetPath);
         return { fileName: snapshot.document.fileName };
       };
 
@@ -905,16 +925,18 @@ export class DesktopApplicationController {
           : `${path.basename(unsafeFileName)}.pdf`;
         const selection = await dialog.showSaveDialog(session.window, {
           title: "导出 PDF",
-          defaultPath: path.join(
-            app.getPath("documents"),
-            suggestedName
-          ),
+          defaultPath:
+            await this.#saveLocationStore.resolveDefaultPath(
+              session.currentFilePath,
+              suggestedName
+            ),
           filters: [{ name: "PDF 文件", extensions: ["pdf"] }]
         });
         if (selection.canceled || !selection.filePath) {
           return false;
         }
         await writeFile(selection.filePath, unsafePdf);
+        await this.#recordSuccessfulFile(selection.filePath);
         return true;
       }
     );
@@ -971,10 +993,11 @@ export class DesktopApplicationController {
             session.window,
             {
               title: "导出 DOCX",
-              defaultPath: path.join(
-                app.getPath("documents"),
-                generated.fileName
-              ),
+              defaultPath:
+                await this.#saveLocationStore.resolveDefaultPath(
+                  session.currentFilePath,
+                  generated.fileName
+                ),
               filters: [
                 {
                   name: "Word 文档",
@@ -996,6 +1019,7 @@ export class DesktopApplicationController {
             selection.filePath,
             generated.docx
           );
+          await this.#recordSuccessfulFile(saved.targetPath);
           return {
             ok: true,
             saved: true,

apps/desktop/src/main.ts

@@ -337,7 +337,12 @@ if (!hasSingleInstanceLock) {
         windowStatePath: path.join(
           app.getPath("userData"),
           "window-state.json"
-        )
+        ),
+        saveLocationStatePath: path.join(
+          app.getPath("userData"),
+          "save-location.json"
+        ),
+        documentsDirectory: app.getPath("documents")
       });
       await applicationController.initialize();
 

apps/desktop/src/save-location-state.ts

@@ -0,0 +1,164 @@
+import {
+  mkdir,
+  readFile,
+  rename,
+  rm,
+  stat,
+  writeFile
+} from "node:fs/promises";
+import path from "node:path";
+
+const SAVE_LOCATION_STATE_VERSION = 1;
+
+export interface SaveLocationState {
+  version: 1;
+  directory: string;
+}
+
+export interface ResolveDefaultSavePathOptions {
+  sourceFilePath?: string;
+  lastSaveDirectory?: string;
+  documentsDirectory: string;
+  suggestedFileName: string;
+}
+
+export function parseSaveLocationState(
+  value: unknown
+): SaveLocationState | undefined {
+  if (!value || typeof value !== "object") {
+    return undefined;
+  }
+  const state = value as Partial<SaveLocationState>;
+  if (
+    state.version !== SAVE_LOCATION_STATE_VERSION ||
+    typeof state.directory !== "string" ||
+    !path.isAbsolute(state.directory)
+  ) {
+    return undefined;
+  }
+  return {
+    version: SAVE_LOCATION_STATE_VERSION,
+    directory: path.resolve(state.directory)
+  };
+}
+
+async function isAvailableDirectory(directory: string | undefined) {
+  if (!directory || !path.isAbsolute(directory)) {
+    return false;
+  }
+  try {
+    return (await stat(directory)).isDirectory();
+  } catch {
+    return false;
+  }
+}
+
+function assertSuggestedFileName(value: string) {
+  const fileName = path.basename(value.trim());
+  if (!fileName || fileName === ".") {
+    throw new Error("默认保存文件名无效");
+  }
+  return fileName;
+}
+
+export async function resolveDefaultSavePath(
+  options: ResolveDefaultSavePathOptions
+) {
+  const fileName = assertSuggestedFileName(
+    options.suggestedFileName
+  );
+  const sourceDirectory = options.sourceFilePath
+    ? path.dirname(path.resolve(options.sourceFilePath))
+    : undefined;
+  if (await isAvailableDirectory(sourceDirectory)) {
+    return path.join(sourceDirectory!, fileName);
+  }
+  if (await isAvailableDirectory(options.lastSaveDirectory)) {
+    return path.join(options.lastSaveDirectory!, fileName);
+  }
+  return path.join(
+    path.resolve(options.documentsDirectory),
+    fileName
+  );
+}
+
+export async function loadSaveLocationState(filePath: string) {
+  try {
+    return parseSaveLocationState(
+      JSON.parse(await readFile(filePath, "utf8")) as unknown
+    );
+  } catch {
+    return undefined;
+  }
+}
+
+export async function saveSaveLocationState(
+  filePath: string,
+  directory: string
+) {
+  const state = parseSaveLocationState({
+    version: SAVE_LOCATION_STATE_VERSION,
+    directory
+  });
+  if (!state) {
+    throw new Error("最近保存目录无效");
+  }
+  await mkdir(path.dirname(filePath), { recursive: true });
+  const temporaryPath = `${filePath}.${process.pid}.tmp`;
+  try {
+    await writeFile(
+      temporaryPath,
+      `${JSON.stringify(state, null, 2)}\n`,
+      "utf8"
+    );
+    await rename(temporaryPath, filePath);
+  } catch (error) {
+    await rm(temporaryPath, { force: true }).catch(() => undefined);
+    throw error;
+  }
+  return state;
+}
+
+export class SaveLocationStore {
+  readonly #statePath: string;
+  readonly #documentsDirectory: string;
+  #lastSaveDirectory: string | undefined;
+  #pendingWrite = Promise.resolve();
+
+  constructor(statePath: string, documentsDirectory: string) {
+    this.#statePath = statePath;
+    this.#documentsDirectory = documentsDirectory;
+  }
+
+  async initialize() {
+    this.#lastSaveDirectory = (
+      await loadSaveLocationState(this.#statePath)
+    )?.directory;
+  }
+
+  resolveDefaultPath(
+    sourceFilePath: string | undefined,
+    suggestedFileName: string
+  ) {
+    return resolveDefaultSavePath({
+      documentsDirectory: this.#documentsDirectory,
+      suggestedFileName,
+      ...(sourceFilePath ? { sourceFilePath } : {}),
+      ...(this.#lastSaveDirectory
+        ? { lastSaveDirectory: this.#lastSaveDirectory }
+        : {})
+    });
+  }
+
+  async recordSuccessfulFile(filePath: string) {
+    const directory = path.dirname(path.resolve(filePath));
+    this.#lastSaveDirectory = directory;
+    const write = this.#pendingWrite
+      .catch(() => undefined)
+      .then(() =>
+        saveSaveLocationState(this.#statePath, directory)
+      );
+    this.#pendingWrite = write.then(() => undefined);
+    await write;
+  }
+}

apps/desktop/tests/save-location-state.test.ts

@@ -0,0 +1,153 @@
+import {
+  mkdir,
+  mkdtemp,
+  readFile,
+  rm
+} from "node:fs/promises";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import {
+  SaveLocationStore,
+  loadSaveLocationState,
+  parseSaveLocationState,
+  resolveDefaultSavePath,
+  saveSaveLocationState
+} from "../src/save-location-state.js";
+
+let temporaryDirectory: string | undefined;
+
+async function createTemporaryDirectory() {
+  temporaryDirectory = await mkdtemp(
+    path.join(tmpdir(), "md-to-pdf-save-location-")
+  );
+  return temporaryDirectory;
+}
+
+afterEach(async () => {
+  if (temporaryDirectory) {
+    await rm(temporaryDirectory, { recursive: true, force: true });
+    temporaryDirectory = undefined;
+  }
+});
+
+describe("桌面默认保存位置", () => {
+  it("只接受版本匹配的绝对目录状态", () => {
+    expect(
+      parseSaveLocationState({
+        version: 1,
+        directory: path.resolve("C:/Documents")
+      })
+    ).toEqual({
+      version: 1,
+      directory: path.resolve("C:/Documents")
+    });
+    expect(
+      parseSaveLocationState({ version: 2, directory: "C:/Documents" })
+    ).toBeUndefined();
+    expect(
+      parseSaveLocationState({ version: 1, directory: "relative" })
+    ).toBeUndefined();
+  });
+
+  it("优先使用有效的源文件目录", async () => {
+    const root = await createTemporaryDirectory();
+    const sourceDirectory = path.join(root, "source");
+    const historyDirectory = path.join(root, "history");
+    const documentsDirectory = path.join(root, "documents");
+    await Promise.all([
+      mkdir(sourceDirectory),
+      mkdir(historyDirectory),
+      mkdir(documentsDirectory)
+    ]);
+
+    await expect(
+      resolveDefaultSavePath({
+        sourceFilePath: path.join(sourceDirectory, "source.md"),
+        lastSaveDirectory: historyDirectory,
+        documentsDirectory,
+        suggestedFileName: "report.pdf"
+      })
+    ).resolves.toBe(path.join(sourceDirectory, "report.pdf"));
+  });
+
+  it("源目录不可用时使用最近成功目录", async () => {
+    const root = await createTemporaryDirectory();
+    const historyDirectory = path.join(root, "history");
+    const documentsDirectory = path.join(root, "documents");
+    await Promise.all([
+      mkdir(historyDirectory),
+      mkdir(documentsDirectory)
+    ]);
+
+    await expect(
+      resolveDefaultSavePath({
+        sourceFilePath: path.join(root, "missing", "source.md"),
+        lastSaveDirectory: historyDirectory,
+        documentsDirectory,
+        suggestedFileName: "report.docx"
+      })
+    ).resolves.toBe(path.join(historyDirectory, "report.docx"));
+  });
+
+  it("源目录和历史目录均不可用时回退到文档目录", async () => {
+    const root = await createTemporaryDirectory();
+    const documentsDirectory = path.join(root, "documents");
+    await mkdir(documentsDirectory);
+
+    await expect(
+      resolveDefaultSavePath({
+        lastSaveDirectory: path.join(root, "missing"),
+        documentsDirectory,
+        suggestedFileName: "draft.md"
+      })
+    ).resolves.toBe(path.join(documentsDirectory, "draft.md"));
+  });
+
+  it("以原子 JSON 状态持久化并恢复最近目录", async () => {
+    const root = await createTemporaryDirectory();
+    const directory = path.join(root, "saved");
+    const statePath = path.join(root, "state", "save-location.json");
+    await mkdir(directory);
+
+    await saveSaveLocationState(statePath, directory);
+
+    await expect(loadSaveLocationState(statePath)).resolves.toEqual({
+      version: 1,
+      directory
+    });
+    expect(JSON.parse(await readFile(statePath, "utf8"))).toEqual({
+      version: 1,
+      directory
+    });
+  });
+
+  it("跨 Store 实例恢复最近成功文件目录", async () => {
+    const root = await createTemporaryDirectory();
+    const savedDirectory = path.join(root, "saved");
+    const documentsDirectory = path.join(root, "documents");
+    const statePath = path.join(root, "save-location.json");
+    await Promise.all([
+      mkdir(savedDirectory),
+      mkdir(documentsDirectory)
+    ]);
+    const first = new SaveLocationStore(
+      statePath,
+      documentsDirectory
+    );
+    await first.initialize();
+    await first.recordSuccessfulFile(
+      path.join(savedDirectory, "first.pdf")
+    );
+
+    const restored = new SaveLocationStore(
+      statePath,
+      documentsDirectory
+    );
+    await restored.initialize();
+
+    await expect(
+      restored.resolveDefaultPath(undefined, "second.docx")
+    ).resolves.toBe(path.join(savedDirectory, "second.docx"));
+  });
+});

docs/PROGRESS.md

@@ -1,6 +1,6 @@
 # Markdown PDF 导出器进度
 
-最后更新：2026-07-31
+最后更新：2026-08-01
 
 ## 1. 当前概况
 
@@ -353,6 +353,15 @@ SHA-256；交互模式仅在文件存在且哈希正确时显示默认勾选项
 文档右侧留白分别约为 30.38px、30.05px 和 30.45px；120% 与 400%
 均准确到达各自最大横向滚动值，快速和连续预览结构未改变。
 
+Desktop 已统一 Markdown 保存/另存为、PDF 导出和 DOCX 导出的默认路径
+策略：有效源文件目录优先，其次使用最近一次成功写入文件的目录，最后
+回退到 Electron 返回的用户“文档”目录。最近目录只在目标文件实际写入
+成功后更新，普通保存已有 Markdown 也会更新；状态使用版本化 JSON、
+临时文件和原子替换写入应用数据目录，因此可跨窗口和应用重启复用。源
+目录或历史目录被删除、移动、变为普通文件或不可访问时会自动跳过，不
+阻断保存对话框。状态持久化失败不会把已经成功写入的用户文件误报为保存
+失败。该优化作为独立提交完成，不与 FP3-C Docker 部署改动混合。
+
 ## 2. 已完成
 
 ### 2.1 项目骨架