diff --git a/lua/spacevim/plugin/autosave.lua b/lua/spacevim/plugin/autosave.lua
index b488835a4..1286bdae7 100644
--- a/lua/spacevim/plugin/autosave.lua
+++ b/lua/spacevim/plugin/autosave.lua
@@ -6,115 +6,104 @@
 -- License: GPLv3
 --=============================================================================
 
-
 local default_opt = {
-    timeoutlen = 60 * 5 * 1000,
-    backupdir = '~/.cache/SpaceVim/backup/',
-    save_all_buffers = false,
-    event = {'InsertLeave', 'TextChanged'},
-    filetype = {},
-    filetypeExclude = {},
-    buftypeExclude = {},
-    bufNameExclude = {}
+  timeoutlen = 60 * 5 * 1000,
+  backupdir = '~/.cache/SpaceVim/backup/',
+  save_all_buffers = false,
+  event = { 'InsertLeave', 'TextChanged' },
+  filetype = {},
+  filetypeExclude = {},
+  buftypeExclude = {},
+  bufNameExclude = {},
 }
 
 local logger = require('spacevim.logger').derive('autosave')
 local f = require('spacevim.api').import('file')
-
-
 local autosave_timer = -1
-
 local M = {}
 
-function M.config(opt)
-    for option, value in ipairs(default_opt) do
-        if opt[option] ~= nil then
-            logger.debug('set option`' .. option .. '` to :' .. opt[option])
-            default_opt[option] = opt[option]
-            if option == 'timeoutlen' then
-                setup_timer(default_opt[option])
-            elseif option == 'event' then
-                setup_events()
-            end
-        end
-    end
-
-end
-
 local function location_path(bufname)
-    if vim.fn.empty(default_opt.backupdir) == 1 then
-        return bufname
-    else
-        local pth = f.unify_path(default_opt.backupdir, ':p') .. f.path_to_fname(bufname, '+=') .. '.backup'
-        logger.info('backup path is:' .. pth)
-        return pth
-    end
+  if vim.fn.empty(default_opt.backupdir) == 1 then
+    return bufname
+  else
+    local pth = f.unify_path(default_opt.backupdir, ':p')
+      .. f.path_to_fname(bufname, '+=')
+      .. '.backup'
+    logger.info('backup path is:' .. pth)
+    return pth
+  end
 end
 
 local function save_buffer(bufnr)
-    if vim.fn.getbufvar(bufnr, '&modified') == 1 and
-        vim.fn.empty(vim.fn.getbufvar(bufnr, '&buftype')) == 1 and
-        vim.fn.filewritable(vim.fn.bufname(bufnr)) == 1 and
-        vim.fn.empty(vim.fn.bufname(bufnr)) == 0 then
-        local lines = vim.fn.getbufline(bufnr, 1, '$')
-        local f = location_path(vim.fn.bufname(bufnr))
-        local ok, rst = pcall(vim.fn.writefile, lines, f)
-        if not ok then
-            logger.info('failed to autosave file:' .. f)
-            logger.warn(rst)
-        end
-        if vim.fn.empty(default_opt.backupdir) == 1 then
-            vim.fn.setbufvar(bufnr, '&modified', 0)
-            vim.cmd('silent checktime ' .. bufnr)
-
-        end
+  if
+    vim.fn.getbufvar(bufnr, '&modified') == 1
+    and vim.fn.empty(vim.fn.getbufvar(bufnr, '&buftype')) == 1
+    and vim.fn.filewritable(vim.fn.bufname(bufnr)) == 1
+    and vim.fn.empty(vim.fn.bufname(bufnr)) == 0
+  then
+    local lines = vim.fn.getbufline(bufnr, 1, '$')
+    local f = location_path(vim.fn.bufname(bufnr))
+    local ok, rst = pcall(vim.fn.writefile, lines, f)
+    if not ok then
+      logger.info('failed to autosave file:' .. f)
+      logger.warn(rst)
     end
-
+    if vim.fn.empty(default_opt.backupdir) == 1 then
+      vim.fn.setbufvar(bufnr, '&modified', 0)
+      vim.cmd('silent checktime ' .. bufnr)
+    end
+  end
 end
 
 local function auto_dosave(...)
-    if default_opt.save_all_buffers then
-        for _, nr in ipairs(vim.fn.range(1, vim.fn.bufnr('$'))) do
-            save_buffer(nr)
-        end
-
-    else
-        save_buffer(vim.fn.bufnr('%'))
+  if default_opt.save_all_buffers then
+    for _, nr in ipairs(vim.fn.range(1, vim.fn.bufnr('$'))) do
+      save_buffer(nr)
     end
-
+  else
+    save_buffer(vim.fn.bufnr('%'))
+  end
 end
-
 local function setup_timer(_timeoutlen)
-    if vim.fn.has('timers') == 0 then
-        logger.warn('failed to setup timer, needs `+timers` feature!')
-        return
-    end
-    if _timeoutlen == 0 then
-        vim.fn.timer_stop(autosave_timer)
-        logger.debug('disabled autosave timer!')
-    end
-    if _timeoutlen < 1000 or _timeoutlen > 60 * 100 * 1000 then
-        local msg = "timeoutlen must be given in millisecods and can't be > 100*60*1000 (100 minutes) or < 1000 (1 second)"
-        logger.warn(msg)
-        return
-    end
+  if vim.fn.has('timers') == 0 then
+    logger.warn('failed to setup timer, needs `+timers` feature!')
+    return
+  end
+  if _timeoutlen == 0 then
     vim.fn.timer_stop(autosave_timer)
-    autosave_timer = vim.fn.timer_start(_timeoutlen, auto_dosave, {['repeat'] =  -1})
-    if vim.fn.empty(autosave_timer) == 0 then
-        logger.debug('setup new autosave timer, timeoutlen:' .. _timeoutlen)
-    end
-
+    logger.debug('disabled autosave timer!')
+  end
+  if _timeoutlen < 1000 or _timeoutlen > 60 * 100 * 1000 then
+    local msg =
+      "timeoutlen must be given in millisecods and can't be > 100*60*1000 (100 minutes) or < 1000 (1 second)"
+    logger.warn(msg)
+    return
+  end
+  vim.fn.timer_stop(autosave_timer)
+  autosave_timer = vim.fn.timer_start(_timeoutlen, auto_dosave, { ['repeat'] = -1 })
+  if vim.fn.empty(autosave_timer) == 0 then
+    logger.debug('setup new autosave timer, timeoutlen:' .. _timeoutlen)
+  end
 end
 
-
 local function setup_events()
+  if #default_opt.event > 0 then
     vim.api.nvim_create_autocmd(default_opt.event, {
-        pattern = {'*'},
-        callback = auto_dosave,
+      pattern = { '*' },
+      callback = auto_dosave,
     })
+  end
 end
 
-setup_timer(default_opt.timeoutlen)
-setup_events()
+function M.config(opt)
+  for option, value in pairs(default_opt) do
+    if opt[option] ~= nil then
+      logger.debug('set option`' .. option .. '` to :' .. vim.inspect(value))
+      default_opt[option] = value
+    end
+  end
+  setup_timer(default_opt.timeoutlen)
+  setup_events()
+end
 
 return M