[Refactor/Bugfix] Improve null ls handler (#1277)

lua/lsp/utils.lua

@@ -0,0 +1,27 @@
+local M = {}
+
+function M.is_client_active(name)
+  local clients = vim.lsp.get_active_clients()
+  for _, client in pairs(clients) do
+    if client.name == name then
+      return true
+    end
+  end
+  return false
+end
+
+function M.get_active_client_by_ft(filetype)
+  if not lvim.lang[filetype] or not lvim.lang[filetype].lsp then
+    return nil
+  end
+
+  local clients = vim.lsp.get_active_clients()
+  for _, client in pairs(clients) do
+    if client.name == lvim.lang[filetype].lsp.provider then
+      return client
+    end
+  end
+  return nil
+end
+
+return M