From cc759d3a91f08960a016f6a18c4afd6aeeeef512 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kristoffer=20Plagborg=20Bak=20S=C3=B8rensen?=
 <57013304+kpbaks@users.noreply.github.com>
Date: Sat, 14 Mar 2026 15:25:48 +0100
Subject: [PATCH] Highlight builtin diff configuration values in
 `git-attributes` language (#15248)

---
 runtime/queries/git-attributes/highlights.scm | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/runtime/queries/git-attributes/highlights.scm b/runtime/queries/git-attributes/highlights.scm
index 0b1415b5..9e4cdd67 100644
--- a/runtime/queries/git-attributes/highlights.scm
+++ b/runtime/queries/git-attributes/highlights.scm
@@ -7,3 +7,35 @@
 
 (attribute_unset) @operator
 (attribute_set_to) @operator
+
+; Highlight builtin diff configuration
+; The list of languages is taken from here https://git-scm.com/docs/gitattributes#_defining_a_custom_hunk_header
+(attribute_set_to
+  (attribute) @operator (#eq? @operator "diff")
+  (value) @variable.builtin (#any-of? @variable.builtin
+    "ada"
+    "bash"
+    "bibtex"
+    "cpp"
+    "csharp"
+    "css"
+    "dts"
+    "elixir"
+    "fortran"
+    "fountain"
+    "golang"
+    "html"
+    "java"
+    "kotlin"
+    "markdown"
+    "matlab"
+    "objc"
+    "pascal"
+    "perl"
+    "php"
+    "python"
+    "ruby"
+    "rust"
+    "scheme"
+    "tex"
+  ))
-- 
2.51.2