From bf312182264de95e643d25dc69128089266211e5 Mon Sep 17 00:00:00 2001
From: Ning Cui <ning.cui@compass.com>
Date: Wed, 3 Jun 2026 12:28:42 -0400
Subject: [PATCH] harness(chunk-1): Add a path-separator boundary check to
 tildeifyPath and add a regression test

---
 packages/core/src/utils/paths.test.ts | 25 +++++++++++++++++++++++++
 packages/core/src/utils/paths.ts      | 10 +++++-----
 2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/packages/core/src/utils/paths.test.ts b/packages/core/src/utils/paths.test.ts
index 6759b7978c9..c8371c1bba6 100644
--- a/packages/core/src/utils/paths.test.ts
+++ b/packages/core/src/utils/paths.test.ts
@@ -14,6 +14,8 @@ import {
   isSubpath,
   shortenPath,
   resolveToRealPath,
+  tildeifyPath,
+  homedir,
 } from './paths.js';
 
 vi.mock('node:fs', async (importOriginal) => {
@@ -529,3 +531,26 @@ describe('resolveToRealPath', () => {
     expect(resolveToRealPath(input)).toBe(expected);
   });
 });
+
+describe('tildeifyPath', () => {
+  const home = homedir();
+
+  it('should replace the home directory prefix with a tilde', () => {
+    const input = path.join(home, 'projects', 'file.txt');
+    expect(tildeifyPath(input)).toBe(`~${path.sep}projects${path.sep}file.txt`);
+  });
+
+  it('should tildeify the home directory itself', () => {
+    expect(tildeifyPath(home)).toBe('~');
+  });
+
+  it('should not tildeify a sibling path that merely starts with the home dir name', () => {
+    const sibling = `${home}foo${path.sep}bar`;
+    expect(tildeifyPath(sibling)).toBe(sibling);
+  });
+
+  it('should return an unrelated path unchanged', () => {
+    const other = path.join(path.sep, 'tmp', 'something');
+    expect(tildeifyPath(other)).toBe(other);
+  });
+});
diff --git a/packages/core/src/utils/paths.ts b/packages/core/src/utils/paths.ts
index 94ccd96cf30..0ce02e9cadf 100644
--- a/packages/core/src/utils/paths.ts
+++ b/packages/core/src/utils/paths.ts
@@ -43,15 +43,15 @@ export function tmpdir(): string {
 
 /**
  * Replaces the home directory with a tilde.
- * @param path - The path to tildeify.
+ * @param filePath - The path to tildeify.
  * @returns The tildeified path.
  */
-export function tildeifyPath(path: string): string {
+export function tildeifyPath(filePath: string): string {
   const homeDir = homedir();
-  if (path.startsWith(homeDir)) {
-    return path.replace(homeDir, '~');
+  if (filePath === homeDir || filePath.startsWith(homeDir + path.sep)) {
+    return filePath.replace(homeDir, '~');
   }
-  return path;
+  return filePath;
 }
 
 /**