nixpkgs/neovim: add treesitter grammar for elvish

.config/nixpkgs/neovim/flake.nix

@@ -9,6 +9,18 @@
     let
       withPkgs = system: import nixpkgs {
         inherit system;
+        overlays = [(final: prev: {
+          treesitter = prev.treesitter.override {
+            extraGrammars = [
+              (final.fetchFromGitHub {
+                owner = "ckafi";
+                repo = "tree-sitter-elvish";
+                rev = "f32711e31e987fd5c2c002f3daba02f25c68672f";
+                hash = "sha256-/3npcIfTH8w5ekLTb//ZCTxuSGhOXkUBaCq3WWcK2J4=";
+              })
+            ];
+          };
+        })];
       };
     in
     {

.config/nixpkgs/neovim/neovim.nix

@@ -65,6 +65,7 @@ neovim.override {
         (nvim-treesitter.withPlugins (p: with p; [
           tree-sitter-bash
           tree-sitter-css
+          tree-sitter-elvish
           tree-sitter-go
           tree-sitter-javascript
           tree-sitter-json

.config/nixpkgs/neovim/plugins.nix

@@ -197,17 +197,6 @@
       sha256 = "08syrady97mjp9zjwjp69p0vnd3fx1s8i5cbff7dzglww1ibl3iw";
     };
 
-    dontBuild = true;
-  })
-  (buildNeovimPlugin {
-    name = "vim-syntax-elvish";
-    src = fetchFromGitHub {
-      owner = "chlorm";
-      repo = "vim-syntax-elvish";
-      rev = "53068bcec7209422df4494f5fdb1202f5937ccea";
-      sha256 = "08yyc7l3r0nqr43c25aag7a6dif9hzflw6x1b06rzfqbchhl60rw";
-    };
-
     dontBuild = true;
   })
 ]

.config/nixpkgs/neovim/update.sh

@@ -47,6 +47,5 @@ add_plugin jose-elias-alvarez typescript.nvim
 add_plugin jose-elias-alvarez null-ls.nvim
 add_plugin j-hui fidget.nvim
 add_plugin sainnhe sonokai
-add_plugin chlorm vim-syntax-elvish
 
 echo "]"