Add Nix syntax

.gitmodules

@@ -86,3 +86,6 @@
 	path = helix-syntax/languages/tree-sitter-elixir
 	url = https://github.com/IceDragon200/tree-sitter-elixir
 	shallow = true
+[submodule "helix-syntax/languages/tree-sitter-nix"]
+	path = helix-syntax/languages/tree-sitter-nix
+	url = https://github.com/cstrahan/tree-sitter-nix

helix-syntax/languages/tree-sitter-nix

@@ -0,0 +1 @@
+Subproject commit 50f38ceab667f9d482640edfee803d74f4edeba5

helix-syntax/src/lib.rs

@@ -68,18 +68,19 @@ mk_langs!(
     // 2) tree-sitter function to call to get a Language
     (Agda, tree_sitter_agda),
     (Bash, tree_sitter_bash),
-    (C, tree_sitter_c),
-    (CSharp, tree_sitter_c_sharp),
     (Cpp, tree_sitter_cpp),
+    (CSharp, tree_sitter_c_sharp),
     (Css, tree_sitter_css),
+    (C, tree_sitter_c),
     (Elixir, tree_sitter_elixir),
     (Go, tree_sitter_go),
     // (Haskell, tree_sitter_haskell),
     (Html, tree_sitter_html),
-    (Java, tree_sitter_java),
     (Javascript, tree_sitter_javascript),
+    (Java, tree_sitter_java),
     (Json, tree_sitter_json),
     (Julia, tree_sitter_julia),
+    (Nix, tree_sitter_nix),
     (Php, tree_sitter_php),
     (Python, tree_sitter_python),
     (Ruby, tree_sitter_ruby),

languages.toml

@@ -116,6 +116,15 @@ language-server = { command = "pyls" }
 # TODO: pyls needs utf-8 offsets
 indent = { tab-width = 2, unit = "  " }
 
+[[language]]
+name = "nix"
+scope = "source.nix"
+injection-regex = "nix"
+file-types = ["nix"]
+roots = []
+
+indent = { tab-width = 2, unit = "  " }
+
 [[language]]
 name = "ruby"
 scope = "source.ruby"