From f45a8cb7a122db73109cb57a0bd1b3efabb59050 Mon Sep 17 00:00:00 2001
From: Brennan Benson <79079362+brennanb2025@users.noreply.github.com>
Date: Mon, 3 Aug 2026 20:20:23 -0700
Subject: [PATCH] fix(mobile): detect files directly under path roots

---
 .../markdown-file-path-detection.test.ts          | 15 +++++++++++++++
 .../components/markdown-file-path-detection.ts    |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/mobile/src/components/markdown-file-path-detection.test.ts b/mobile/src/components/markdown-file-path-detection.test.ts
index 1b78c102692..7e029e45d33 100644
--- a/mobile/src/components/markdown-file-path-detection.test.ts
+++ b/mobile/src/components/markdown-file-path-detection.test.ts
@@ -74,6 +74,21 @@ describe('detectFilePathSegments', () => {
     expect(detectFilePathSegments('/repo/src/index.ts')).toEqual([
       { type: 'file', value: '/repo/src/index.ts', path: '/repo/src/index.ts' }
     ])
+    expect(detectFilePathSegments('/root.ts')).toEqual([
+      { type: 'file', value: '/root.ts', path: '/root.ts' }
+    ])
+  })
+
+  it('detects files directly under explicit Windows and relative roots', () => {
+    expect(detectFilePathSegments(String.raw`C:\root.ts`)).toEqual([
+      { type: 'file', value: String.raw`C:\root.ts`, path: String.raw`C:\root.ts` }
+    ])
+    expect(detectFilePathSegments('./root.ts')).toEqual([
+      { type: 'file', value: './root.ts', path: 'root.ts' }
+    ])
+    expect(detectFilePathSegments('../root.ts')).toEqual([
+      { type: 'file', value: '../root.ts', path: '../root.ts' }
+    ])
   })
 
   it('detects paths with :line and :line:col suffixes', () => {
diff --git a/mobile/src/components/markdown-file-path-detection.ts b/mobile/src/components/markdown-file-path-detection.ts
index cf24b2c4b51..744727869a4 100644
--- a/mobile/src/components/markdown-file-path-detection.ts
+++ b/mobile/src/components/markdown-file-path-detection.ts
@@ -87,7 +87,7 @@ const EXTENSION_SET = new Set<string>(FILE_EXTENSIONS)
 // alternatives cover Windows drives, UNC, and POSIX absolute roots; the optional
 // tail captures agent-style :line(:col) citations.
 const CANDIDATE_PATTERN =
-  /(?:[A-Za-z]:[\\/]|\\\\|[\\/])?(?:\.{1,2}[\\/])?(?:[\w.@~+-]+[\\/])+[\w.@+-]+\.[A-Za-z0-9]+(?::[1-9]\d*(?::[1-9]\d*)?)?/g
+  /(?:(?:[A-Za-z]:[\\/]|\\\\|[\\/]|\.{1,2}[\\/])(?:[\w.@~+-]+[\\/])*|(?:[\w.@~+-]+[\\/])+)[\w.@+-]+\.[A-Za-z0-9]+(?::[1-9]\d*(?::[1-9]\d*)?)?/g
 
 // A path candidate in chat prose is short; a much longer run can't hold one worth
 // linkifying but can push CANDIDATE_PATTERN into super-linear backtracking, so we