From 6c1dcb94ba1fafb4dd20172551a0078c0f9194dd Mon Sep 17 00:00:00 2001
From: xfocus3 <7467779+xfocus3@users.noreply.github.com>
Date: Sat, 30 May 2026 17:23:11 +0100
Subject: [PATCH] Pass --no-ext-diff to internal git diff in standalone mode

When invoked as `delta file1 file2`, delta runs `git diff --no-index` and
colorizes the result. That invocation honored the user's `diff.external`
git config (e.g. `difft`), so the external differ's output was used instead
of delta's, even outside any git repository.

Pass `--no-ext-diff` so delta always gets git's own diff output to format.

Closes #2046
---
 src/subcommands/diff.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/subcommands/diff.rs b/src/subcommands/diff.rs
index 3346d9fe6..ddcbedba8 100644
--- a/src/subcommands/diff.rs
+++ b/src/subcommands/diff.rs
@@ -47,7 +47,10 @@ pub fn build_diff_cmd(
         {
             (
                 SubCmdKind::GitDiff,
-                vec!["git", "diff", "--no-index", "--color"],
+                // `--no-ext-diff` ensures the user's `diff.external` git config
+                // (e.g. `difft`) is not used here: delta needs git's own diff
+                // output to colorize, not a third-party differ's output. See #2046.
+                vec!["git", "diff", "--no-index", "--no-ext-diff", "--color"],
             )
         }
         _ => (