Replace formatting code

templates/nvim/lua/lsp.lua.j2

@@ -176,7 +176,7 @@ vim.diagnostic.config {
   },
 }
 
-local enable_formatting = os.getenv("ENABLE_FORMATTING")
+local enable_formatting = os.getenv("enable_formatting") == 'true';
 
 -- format buffers before saving for specific LSPs
 if (enable_formatting) then
@@ -185,38 +185,21 @@ if (enable_formatting) then
   vim.api.nvim_create_autocmd('LspAttach', {
     group = vim.api.nvim_create_augroup('lsp', { clear = true }),
     callback = function(args)
+      local client = vim.lsp.get_client_by_id(args.data.client_id)
+
+      if vim.list_contains(excluded_clients, client.name) then return end;
+
+      if client.server_capabilities.documentFormattingProvider then
         vim.api.nvim_create_autocmd('BufWritePre', {
           buffer = args.buf,
           callback = function()
-          local formatting_clients = vim.lsp.get_clients {
-            bufnr = args.buf,
-            method = 'textDocument/formatting'
-          }
-
-          local filtered_clients = {}
-
-          for _, client in pairs(formatting_clients) do
-            if vim.list_contains(excluded_clients, client.name) then
-              goto skip
-            end
-
-            table.insert(filtered_clients, client.name)
-            ::skip::
-          end
-
-          if #filtered_clients == 0 then
-            return
-          end
-
             vim.lsp.buf.format {
-            filter = function(client)
-              return vim.list_contains(filtered_clients, client.name)
-            end,
               async = false,
               id = args.data.client_id
             }
           end,
         })
       end
+    end
   })
 end