Lazy buffer creation

lua/cmp/utils/buffer.lua

@@ -0,0 +1,17 @@
+local buffer = {}
+
+buffer.ensure = setmetatable({
+  cache = {}
+}, {
+  __call = function(self, name)
+    if not (self.cache[name] and vim.api.nvim_buf_is_valid(self.cache[name])) then
+      local buf = vim.api.nvim_create_buf(false, true)
+      vim.api.nvim_buf_set_option(buf, 'buftype', 'nofile')
+      vim.api.nvim_buf_set_option(buf, 'bufhidden', 'hide')
+      self.cache[name] = buf
+    end
+    return self.cache[name]
+  end
+})
+
+return buffer