perf: reduce number of native git calls when extracting a codebase (#3105)

src/__tests__/git_utils.test.ts

+import { afterEach, describe, expect, it, vi } from "vitest";
+import { execFile } from "node:child_process";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { promisify } from "node:util";
+
+vi.mock("electron-log", () => ({
+  default: {
+    scope: () => ({
+      debug: vi.fn(),
+      error: vi.fn(),
+      info: vi.fn(),
+      log: vi.fn(),
+      warn: vi.fn(),
+    }),
+  },
+}));
+
+vi.mock("../main/settings", () => ({
+  readSettings: vi.fn(),
+}));
+
+import { gitListFilesNative } from "../ipc/utils/git_utils";
+
+const execFileAsync = promisify(execFile);
+
+async function runGit(repoDir: string, args: string[]): Promise<void> {
+  await execFileAsync("git", args, { cwd: repoDir });
+}
+
+describe("gitListFilesNative", () => {
+  let repoDir: string | undefined;
+
+  afterEach(async () => {
+    if (repoDir) {
+      await fs.promises.rm(repoDir, { recursive: true, force: true });
+      repoDir = undefined;
+    }
+  });
+
+  it("excludes files inside skipped directories recursively", async () => {
+    repoDir = await fs.promises.mkdtemp(path.join(os.tmpdir(), "git-utils-"));
+
+    await runGit(repoDir, ["init"]);
+
+    await fs.promises.mkdir(path.join(repoDir, "src"), { recursive: true });
+    await fs.promises.mkdir(path.join(repoDir, "dist"), { recursive: true });
+    await fs.promises.mkdir(path.join(repoDir, "build"), { recursive: true });
+    await fs.promises.mkdir(path.join(repoDir, "packages", "app", "dist"), {
+      recursive: true,
+    });
+    await fs.promises.mkdir(path.join(repoDir, "node_modules", "pkg"), {
+      recursive: true,
+    });
+
+    await fs.promises.writeFile(path.join(repoDir, "src", "index.ts"), "src");
+    await fs.promises.writeFile(
+      path.join(repoDir, "dist", "tracked.js"),
+      "tracked dist output",
+    );
+    await fs.promises.writeFile(
+      path.join(repoDir, "build", "tracked.js"),
+      "tracked build output",
+    );
+    await fs.promises.writeFile(
+      path.join(repoDir, "packages", "app", "dist", "nested.js"),
+      "nested dist output",
+    );
+    await fs.promises.writeFile(
+      path.join(repoDir, "node_modules", "pkg", "index.js"),
+      "dependency output",
+    );
+    await fs.promises.writeFile(
+      path.join(repoDir, "package-lock.json"),
+      '{"lockfileVersion":3}',
+    );
+
+    await runGit(repoDir, [
+      "add",
+      "src/index.ts",
+      "dist/tracked.js",
+      "build/tracked.js",
+    ]);
+
+    const files = await gitListFilesNative({
+      path: repoDir,
+      excludedDirs: ["node_modules", "dist", "build"],
+      excludedFiles: ["package-lock.json"],
+    });
+
+    expect(files).toEqual(["src/index.ts"]);
+  });
+});

src/ipc/git_types.ts

@@ -18,6 +18,10 @@ export interface GitCommitParams extends GitBaseParams {
 export interface GitFileParams extends GitBaseParams {
   filepath: string;
 }
+export interface GitListFilesParams extends GitBaseParams {
+  excludedFiles: string[];
+  excludedDirs: string[];
+}
 export interface GitCheckoutParams extends GitBaseParams {
   ref: string;
 }

src/ipc/utils/git_utils.ts

@@ -110,6 +110,7 @@ async function execGit(
 import type {
   GitBaseParams,
   GitFileParams,
+  GitListFilesParams,
   GitCheckoutParams,
   GitBranchRenameParams,
   GitCloneParams,
@@ -1155,12 +1156,56 @@ export async function gitIsIgnored({
     throw new DyadError(result.stderr.toString(), DyadErrorKind.Conflict);
   } else {
     // isomorphic-git version
-    return await git.isIgnored({
-      fs,
-      dir: path,
-      filepath,
-    });
+    return await gitIsIgnoredIso({ path, filepath });
+  }
+}
+
+/**
+ * Check whether a specific file/directory is gitignored using isomorphic-git
+ */
+export async function gitIsIgnoredIso({
+  path,
+  filepath,
+}: GitFileParams): Promise<boolean> {
+  return await git.isIgnored({
+    fs,
+    dir: path,
+    filepath,
+  });
+}
+
+/**
+ * Lists all of the files in a git repository, such that:
+ * - Both tracked and untracked files are included.
+ * - Gitignored files/directories are excluded.
+ * - We can exclude additional files/directories as needed.
+ */
+export async function gitListFilesNative({
+  path,
+  excludedFiles,
+  excludedDirs,
+}: GitListFilesParams): Promise<string[]> {
+  const result = await execGit(
+    [
+      "ls-files",
+      "-z",
+      "--cached",
+      "--others",
+      "--exclude-standard",
+      "--",
+      ".",
+      ...excludedFiles.map((file) => `:(exclude,glob)**/${file}`),
+      ...excludedDirs.map((dir) => `:(exclude,glob)**/${dir}/**`),
+    ],
+    path,
+  );
+  if (result.exitCode !== 0) {
+    throw new DyadError(
+      `Failed to list files: ${result.stderr.trim() || result.stdout.trim()}`,
+      DyadErrorKind.Conflict,
+    );
   }
+  return result.stdout.split("\0").filter(Boolean).map(normalizePath);
 }
 
 export async function gitLogNative(

src/utils/codebase.ts

 import fsAsync from "node:fs/promises";
 import path from "node:path";
-import { gitIsIgnored } from "../ipc/utils/git_utils";
+import { gitIsIgnoredIso, gitListFilesNative } from "../ipc/utils/git_utils";
 import log from "electron-log";
 import { IS_TEST_BUILD } from "../ipc/utils/test_utils";
 import { glob } from "glob";
@@ -120,9 +120,9 @@ const gitIgnoreCache = new Map<string, boolean>();
 const gitIgnoreMtimes = new Map<string, number>();
 
 /**
- * Check if a path should be ignored based on git ignore rules
+ * Check if a path should be ignored based on git ignore rules. Uses isomorphic-git
  */
-async function isGitIgnored(
+async function isGitIgnoredIso(
   filePath: string,
   baseDir: string,
 ): Promise<boolean> {
@@ -175,7 +175,7 @@ async function isGitIgnored(
     }
 
     const relativePath = path.relative(baseDir, filePath);
-    const result = await gitIsIgnored({
+    const result = await gitIsIgnoredIso({
       path: baseDir,
       filepath: relativePath,
     });
@@ -244,9 +244,59 @@ export async function readFileWithCache(
 }
 
 /**
- * Recursively walk a directory and collect all relevant files
+ * Traverses a directory and collects all relevant files using native Git.
  */
-async function collectFiles(dir: string, baseDir: string): Promise<string[]> {
+async function collectFilesNativeGit(dir: string): Promise<string[]> {
+  let files: string[] = [];
+
+  try {
+    // We put the vast majority of the computational burden on Git for the
+    // sake of performance. Nonetheless, the behavior of this function
+    // should still be as close as possible to collectFilesIsoGit.
+    files = (
+      await gitListFilesNative({
+        path: dir,
+        excludedFiles: EXCLUDED_FILES,
+        excludedDirs: EXCLUDED_DIRS,
+      })
+    ).map((file) => path.join(dir, file));
+  } catch (error) {
+    logger.error(
+      `Git failed to read directory ${dir} and is falling back to isomorphic-git:`,
+      error,
+    );
+    // Since collectFilesIsoGit traverses the directory tree manually,
+    // we'll still be able to collect the files even if git fails
+    return await collectFilesIsoGit(dir, dir);
+  }
+
+  // Git cannot exclude files by size, so we still need to do that manually
+  return (
+    await Promise.all(
+      files.map(async (file) => {
+        try {
+          const stats = await fsAsync.lstat(file);
+          if (!stats.isFile() || stats.size > MAX_FILE_SIZE) {
+            return "";
+          }
+          return file;
+        } catch (error) {
+          logger.error(`Failed to read file ${file}:`, error);
+          return "";
+        }
+      }),
+    )
+  ).filter(Boolean);
+}
+
+/**
+ * Recursively walk a directory and collect all relevant files. Uses
+ * isomorphic-git to check whether files and directories are gitignored.
+ */
+async function collectFilesIsoGit(
+  dir: string,
+  baseDir: string,
+): Promise<string[]> {
   const files: string[] = [];
 
   // Check if directory exists
@@ -271,13 +321,13 @@ async function collectFiles(dir: string, baseDir: string): Promise<string[]> {
       }
 
       // Skip if the entry is git ignored
-      if (await isGitIgnored(fullPath, baseDir)) {
+      if (await isGitIgnoredIso(fullPath, baseDir)) {
         return;
       }
 
       if (entry.isDirectory()) {
         // Recursively process subdirectories
-        const subDirFiles = await collectFiles(fullPath, baseDir);
+        const subDirFiles = await collectFilesIsoGit(fullPath, baseDir);
         files.push(...subDirFiles);
       } else if (entry.isFile()) {
         // Skip excluded files
@@ -456,7 +506,9 @@ export async function extractCodebase({
   const startTime = Date.now();
 
   // Collect all relevant files
-  let files = await collectFiles(appPath, appPath);
+  let files = settings.enableNativeGit
+    ? await collectFilesNativeGit(appPath)
+    : await collectFilesIsoGit(appPath, appPath);
 
   // Apply virtual filesystem modifications if provided
   if (virtualFileSystem) {