From f392f13af41444920ebbb0a41f07a4843761abe6 Mon Sep 17 00:00:00 2001
From: Stephan Seitz <stephan.seitz@fau.de>
Date: Tue, 16 Mar 2021 05:02:03 +0100
Subject: Add an error message if NPM is not available but needed

---
 lua/nvim-treesitter/install.lua | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'lua/nvim-treesitter/install.lua')

diff --git a/lua/nvim-treesitter/install.lua b/lua/nvim-treesitter/install.lua
index 655e82a3..7380934e 100644
--- a/lua/nvim-treesitter/install.lua
+++ b/lua/nvim-treesitter/install.lua
@@ -184,6 +184,10 @@ local function run_install(cache_folder, install_folder, lang, repo, with_sync,
   end
   if generate_from_grammar then
     if repo.generate_requires_npm then
+      if not vim.fn.executable('npm') ~= 1 then
+        api.nvim_err_writeln('`'..lang..'` requires NPM to be installed from grammar.js')
+        return
+      end
       vim.list_extend(command_list, {
         {
           cmd = 'npm',
-- 
cgit v1.2.3