From 459878ed040140870088b51b0e2e38fd4f02e47d Mon Sep 17 00:00:00 2001
From: Grigory Entin <grigory.entin@gmail.com>
Date: Sat, 12 Sep 2026 04:06:02 +0200
Subject: [PATCH] Added support for file:/// urls.

---
 src/CsvEditorProvider.ts        |  6 +++---
 src/test/provider-utils.test.ts | 10 +++++++++-
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/CsvEditorProvider.ts b/src/CsvEditorProvider.ts
index 9135ca8..0fb74ce 100644
--- a/src/CsvEditorProvider.ts
+++ b/src/CsvEditorProvider.ts
@@ -1999,7 +1999,7 @@ class CsvEditorController {
 
   private isAllowedExternalScheme(scheme: string): boolean {
     const normalized = scheme.toLowerCase();
-    return normalized === 'http' || normalized === 'https' || normalized === 'ftp' || normalized === 'mailto';
+    return normalized === 'http' || normalized === 'https' || normalized === 'ftp' || normalized === 'mailto' || normalized === 'file';
   }
 
   private isAllowedExternalUrl(rawUrl: unknown): rawUrl is string {
@@ -2029,8 +2029,8 @@ class CsvEditorController {
 
   private linkifyUrls(escapedText: string): string {
     // Match URLs in already-escaped text (handles &amp; in query strings).
-    // Supports http, https, ftp, mailto, and www.*.* (Google Sheets-like behavior).
-    const urlPattern = /\b(?:(?:https?:\/\/|ftp:\/\/|mailto:)[^\s<>&"']+(?:&amp;[^\s<>&"']+)*|www\.[^\s<>&"']+\.[^\s<>&"']+)/gi;
+    // Supports http, https, ftp, file, mailto, and www.*.* (Google Sheets-like behavior).
+    const urlPattern = /\b(?:(?:https?:\/\/|ftp:\/\/|file:\/\/|mailto:)[^\s<>&"']+(?:&amp;[^\s<>&"']+)*|www\.[^\s<>&"']+\.[^\s<>&"']+)/gi;
     return escapedText.replace(urlPattern, (rawMatch) => {
       let matched = rawMatch;
       let trailing = '';
diff --git a/src/test/provider-utils.test.ts b/src/test/provider-utils.test.ts
index d968cc1..8976249 100644
--- a/src/test/provider-utils.test.ts
+++ b/src/test/provider-utils.test.ts
@@ -46,6 +46,14 @@ describe('CsvEditorProvider utility methods', () => {
     assert.ok(html.includes('>www.google.com</span>,'));
   });
 
+  it('formatCellContent linkifies file:/// URLs when enabled', () => {
+    const format = CsvEditorProvider.__test.formatCellContent;
+    const html = format('Open file:///tmp/example.csv and continue.', true);
+    assert.ok(html.includes('class="csv-link"'));
+    assert.ok(html.includes('data-href="file:///tmp/example.csv"'));
+    assert.ok(html.includes('>file:///tmp/example.csv</span>'));
+  });
+
   it('formatCellContent leaves URLs as plain text when linkify is disabled', () => {
     const format = CsvEditorProvider.__test.formatCellContent;
     const html = format('https://example.com?a=1&b=2', false);
@@ -66,9 +74,9 @@ describe('CsvEditorProvider utility methods', () => {
     assert.strictEqual(allowed('http://example.com'), true);
     assert.strictEqual(allowed('ftp://example.com/file.txt'), true);
     assert.strictEqual(allowed('mailto:user@example.com'), true);
+    assert.strictEqual(allowed('file:///tmp/x.csv'), true);
     assert.strictEqual(allowed('javascript:alert(1)'), false);
     assert.strictEqual(allowed('data:text/plain,hello'), false);
-    assert.strictEqual(allowed('file:///tmp/x.csv'), false);
     assert.strictEqual(allowed(''), false);
   });