neovim: Close tree if only buffer

modules/neovim/default.nix

@@ -60,6 +60,15 @@
             type = "lua";
             config = ''
               require("nvim-tree").setup()
+
+              vim.api.nvim_create_autocmd("BufEnter", {
+                nested = true,
+                callback = function()
+                  if #vim.api.nvim_list_wins() == 1 and require("nvim-tree.utils").is_nvim_tree_buf() then
+                    vim.cmd "quit"
+                  end
+                end
+              })
             '';
           }
           {