Add Diff language (#19129)

crates/languages/src/diff/config.toml

@@ -0,0 +1,4 @@
+name = "Diff"
+grammar = "diff"
+path_suffixes = ["diff", "patch"]
+brackets = []

crates/languages/src/diff/highlights.scm

@@ -0,0 +1,15 @@
+[
+  (addition)
+  (new_file)
+] @diff.plus
+
+[
+  (deletion)
+  (old_file)
+] @diff.minus
+
+(commit) @constant
+
+(location) @attribute
+
+(command) @function

crates/languages/src/lib.rs

@@ -37,6 +37,7 @@ pub fn init(languages: Arc<LanguageRegistry>, node_runtime: NodeRuntime, cx: &mu
         ("c", tree_sitter_c::LANGUAGE),
         ("cpp", tree_sitter_cpp::LANGUAGE),
         ("css", tree_sitter_css::LANGUAGE),
+        ("diff", tree_sitter_diff::LANGUAGE),
         ("go", tree_sitter_go::LANGUAGE),
         ("gomod", tree_sitter_go_mod::LANGUAGE),
         ("gowork", tree_sitter_gowork::LANGUAGE),
@@ -105,6 +106,7 @@ pub fn init(languages: Arc<LanguageRegistry>, node_runtime: NodeRuntime, cx: &mu
         "css",
         vec![Arc::new(css::CssLspAdapter::new(node_runtime.clone())),]
     );
+    language!("diff");
     language!("go", vec![Arc::new(go::GoLspAdapter)], GoContextProvider);
     language!("gomod", vec![Arc::new(go::GoLspAdapter)], GoContextProvider);
     language!(