diff --git a/autoload/SpaceVim/health/environment.vim b/autoload/SpaceVim/health/environment.vim
index 512a24557..7053ba9f4 100644
--- a/autoload/SpaceVim/health/environment.vim
+++ b/autoload/SpaceVim/health/environment.vim
@@ -11,7 +11,7 @@ function! SpaceVim#health#environment#check() abort
   " for getting the progpath of current vim.
   call add(result, 'Current progpath: ' . v:progname . '(' . get(v:, 'progpath', '') . ')')
   call add(result, 'version: ' . v:version)
-  call add(result, 'OS: ' . SpaceVim#api#import('system').name)
+  call add(result, 'OS: ' . SpaceVim#api#import('system').name())
   call add(result, '[shell, shellcmdflag, shellslash]: ' . string([&shell, &shellcmdflag, &shellslash]))
   return result
 endfunction
diff --git a/autoload/SpaceVim/logger.vim b/autoload/SpaceVim/logger.vim
index fe6c9353d..b6048f781 100644
--- a/autoload/SpaceVim/logger.vim
+++ b/autoload/SpaceVim/logger.vim
@@ -6,143 +6,192 @@
 " License: GPLv3
 "=============================================================================
 
-let s:LOGGER = SpaceVim#api#import('logger')
+if get(g:, 'spacevim_use_lua', 0)
+  function! SpaceVim#logger#info(msg) abort
+    lua require("spacevim.logger").info(
+          \ require("spacevim").eval("a:msg")
+          \ )
+  endfunction
 
-call s:LOGGER.set_name('SpaceVim')
-call s:LOGGER.set_level(get(g:, 'spacevim_debug_level', 1))
-call s:LOGGER.set_silent(1)
-call s:LOGGER.set_verbose(1)
-
-function! SpaceVim#logger#info(msg) abort
-
-  call s:LOGGER.info(a:msg)
-
-endfunction
-
-function! SpaceVim#logger#warn(msg, ...) abort
-  let issilent = get(a:000, 0, 1)
-  call s:LOGGER.warn(a:msg, issilent)
-endfunction
+  function! SpaceVim#logger#warn(msg, ...) abort
+    let issilent = get(a:000, 0, 1)
+    lua require("spacevim.logger").warn(
+          \ require("spacevim").eval("a:msg"),
+          \ require("spacevim").eval("issilent")
+          \ )
+  endfunction
 
 
-function! SpaceVim#logger#error(msg) abort
+  function! SpaceVim#logger#error(msg) abort
+    lua require("spacevim.logger").error(
+          \ require("spacevim").eval("a:msg")
+          \ )
+  endfunction
 
-  call s:LOGGER.error(a:msg)
+  function! SpaceVim#logger#debug(msg) abort
+    lua require("spacevim.logger").debug(
+          \ require("spacevim").eval("a:msg")
+          \ )
+  endfunction
 
-endfunction
-
-function! SpaceVim#logger#viewRuntimeLog() abort
-  let info = "### SpaceVim runtime log :\n\n"
-  let info .= "```log\n"
-
-  let info .= s:LOGGER.view(s:LOGGER.level)
-
-  let info .= "\n```\n"
-  tabnew +setl\ nobuflisted
-  nnoremap <buffer><silent> q :tabclose!<CR>
-  for msg in split(info, "\n")
-    call append(line('$'), msg)
-  endfor
-  normal! "_dd
-  setl nomodifiable
-  setl buftype=nofile
-  setl filetype=markdown
-  call s:syntax_extra()
-endfunction
+  function! SpaceVim#logger#viewRuntimeLog() abort
+    lua require("spacevim.logger").viewRuntimeLog()
+  endfunction
 
 
-function! SpaceVim#logger#viewLog(...) abort
-  let info = "<details><summary> SpaceVim debug information </summary>\n\n"
-  let info .= "### SpaceVim options :\n\n"
-  let info .= "```toml\n"
-  let info .= join(SpaceVim#options#list(), "\n")
-  let info .= "\n```\n"
-  let info .= "\n\n"
+  function! SpaceVim#logger#viewLog(...) abort
+    let bang = get(a:000, 0, 0)
+    return luaeval('require("spacevim.logger").viewLog(require("spacevim").eval("bang"))')
+  endfunction
 
-  let info .= "### SpaceVim layers :\n\n"
-  let info .= SpaceVim#layers#report()
-  let info .= "\n\n"
+  function! SpaceVim#logger#setLevel(level) abort
+    lua require("spacevim.logger").setLevel(require("spacevim").eval("a:level"))
+  endfunction
 
-  let info .= "### SpaceVim Health checking :\n\n"
-  let info .= SpaceVim#health#report()
-  let info .= "\n\n"
+  function! SpaceVim#logger#setOutput(file) abort
+    lua require("spacevim.logger").setOutput(require("spacevim").eval("a:file"))
+  endfunction
 
-  let info .= "### SpaceVim runtime log :\n\n"
-  let info .= "```log\n"
+  function! SpaceVim#logger#derive(name) abort
+    return luaeval('require("spacevim.logger").derive(require("spacevim").eval("a:name"))')
+  endfunction
+else
+  let s:LOGGER = SpaceVim#api#import('logger')
 
-  let info .= s:LOGGER.view(s:LOGGER.level)
+  call s:LOGGER.set_name('SpaceVim')
+  call s:LOGGER.set_level(get(g:, 'spacevim_debug_level', 1))
+  call s:LOGGER.set_silent(1)
+  call s:LOGGER.set_verbose(1)
 
-  let info .= "\n```\n</details>\n\n"
-  if a:0 > 0
-    if a:1 == 1
-      tabnew +setl\ nobuflisted
-      nnoremap <buffer><silent> q :bd!<CR>
-      for msg in split(info, "\n")
-        call append(line('$'), msg)
-      endfor
-      normal! "_dd
-      setl nomodifiable
-      setl buftype=nofile
-      setl filetype=markdown
+  function! SpaceVim#logger#info(msg) abort
+
+    call s:LOGGER.info(a:msg)
+
+  endfunction
+
+  function! SpaceVim#logger#warn(msg, ...) abort
+    let issilent = get(a:000, 0, 1)
+    call s:LOGGER.warn(a:msg, issilent)
+  endfunction
+
+
+  function! SpaceVim#logger#error(msg) abort
+
+    call s:LOGGER.error(a:msg)
+
+  endfunction
+
+  function! SpaceVim#logger#viewRuntimeLog() abort
+    let info = "### SpaceVim runtime log :\n\n"
+    let info .= "```log\n"
+
+    let info .= s:LOGGER.view(s:LOGGER.level)
+
+    let info .= "\n```\n"
+    tabnew +setl\ nobuflisted
+    nnoremap <buffer><silent> q :tabclose!<CR>
+    for msg in split(info, "\n")
+      call append(line('$'), msg)
+    endfor
+    normal! "_dd
+    setl nomodifiable
+    setl buftype=nofile
+  endfunction
+
+
+  function! SpaceVim#logger#viewLog(...) abort
+    let info = "<details><summary> SpaceVim debug information </summary>\n\n"
+    let info .= "### SpaceVim options :\n\n"
+    let info .= "```toml\n"
+    let info .= join(SpaceVim#options#list(), "\n")
+    let info .= "\n```\n"
+    let info .= "\n\n"
+
+    let info .= "### SpaceVim layers :\n\n"
+    let info .= SpaceVim#layers#report()
+    let info .= "\n\n"
+
+    let info .= "### SpaceVim Health checking :\n\n"
+    let info .= SpaceVim#health#report()
+    let info .= "\n\n"
+
+    let info .= "### SpaceVim runtime log :\n\n"
+    let info .= "```log\n"
+
+    let info .= s:LOGGER.view(s:LOGGER.level)
+
+    let info .= "\n```\n</details>\n\n"
+    if a:0 > 0
+      if a:1 == 1
+        tabnew +setl\ nobuflisted
+        nnoremap <buffer><silent> q :bd!<CR>
+        for msg in split(info, "\n")
+          call append(line('$'), msg)
+        endfor
+        normal! "_dd
+        setl nomodifiable
+        setl buftype=nofile
+        setl filetype=markdown
+      else
+        echo info
+      endif
     else
-      echo info
+      return info
     endif
-  else
-    return info
-  endif
-endfunction
+  endfunction
 
-function! s:syntax_extra() abort
-  call matchadd('ErrorMsg','.*[\sError\s\].*')
-  call matchadd('WarningMsg','.*[\sWarn\s\].*')
-endfunction
+  function! s:syntax_extra() abort
+    call matchadd('ErrorMsg','.*[\sError\s\].*')
+    call matchadd('WarningMsg','.*[\sWarn\s\].*')
+  endfunction
 
-""
-" @public
-" Set debug level of SpaceVim. Default is 1.
-"
-"     1 : log all messages
-"
-"     2 : log warning and error messages
-"
-"     3 : log error messages only
-function! SpaceVim#logger#setLevel(level) abort
-  call s:LOGGER.set_level(a:level)
-endfunction
+  ""
+  " @public
+  " Set debug level of SpaceVim. Default is 1.
+  "
+  "     1 : log all messages
+  "
+  "     2 : log warning and error messages
+  "
+  "     3 : log error messages only
+  function! SpaceVim#logger#setLevel(level) abort
+    call s:LOGGER.set_level(a:level)
+  endfunction
 
-""
-" @public
-" Set the log output file of SpaceVim. Default is empty.
-function! SpaceVim#logger#setOutput(file) abort
-  call s:LOGGER.set_file(a:file)
-endfunction
+  ""
+  " @public
+  " Set the log output file of SpaceVim. Default is empty.
+  function! SpaceVim#logger#setOutput(file) abort
+    call s:LOGGER.set_file(a:file)
+  endfunction
 
 
-" derive a logger for built-in plugins
-" [ name ] [11:31:26] [ Info ] log message here
+  " derive a logger for built-in plugins
+  " [ name ] [11:31:26] [ Info ] log message here
 
-let s:derive = {}
-let s:derive.origin_name = s:LOGGER.get_name()
+  let s:derive = {}
+  let s:derive.origin_name = s:LOGGER.get_name()
 
-function! s:derive.info(msg) abort
-  call s:LOGGER.set_name(self.derive_name)
-  call s:LOGGER.info(a:msg)
-  call s:LOGGER.set_name(self.origin_name)
-endfunction
+  function! s:derive.info(msg) abort
+    call s:LOGGER.set_name(self.derive_name)
+    call s:LOGGER.info(a:msg)
+    call s:LOGGER.set_name(self.origin_name)
+  endfunction
 
-function! s:derive.warn(msg) abort
-  call s:LOGGER.set_name(self.derive_name)
-  call s:LOGGER.warn(a:msg)
-  call s:LOGGER.set_name(self.origin_name)
-endfunction
+  function! s:derive.warn(msg) abort
+    call s:LOGGER.set_name(self.derive_name)
+    call s:LOGGER.warn(a:msg)
+    call s:LOGGER.set_name(self.origin_name)
+  endfunction
 
-function! s:derive.error(msg) abort
-  call s:LOGGER.set_name(self.derive_name)
-  call s:LOGGER.error(a:msg)
-  call s:LOGGER.set_name(self.origin_name)
-endfunction
+  function! s:derive.error(msg) abort
+    call s:LOGGER.set_name(self.derive_name)
+    call s:LOGGER.error(a:msg)
+    call s:LOGGER.set_name(self.origin_name)
+  endfunction
 
-function! SpaceVim#logger#derive(name) abort
-  let s:derive.derive_name = printf('%' . strdisplaywidth(s:LOGGER.get_name()) . 'S', a:name)
-  return deepcopy(s:derive)
-endfunction
+  function! SpaceVim#logger#derive(name) abort
+    let s:derive.derive_name = printf('%' . strdisplaywidth(s:LOGGER.get_name()) . 'S', a:name)
+    return deepcopy(s:derive)
+  endfunction
+endif
diff --git a/autoload/SpaceVim/plugins/a.vim b/autoload/SpaceVim/plugins/a.vim
index 209f3c34c..ab0f8e6a7 100644
--- a/autoload/SpaceVim/plugins/a.vim
+++ b/autoload/SpaceVim/plugins/a.vim
@@ -11,223 +11,254 @@ set cpo&vim
 scriptencoding utf-8
 
 
-" Load SpaceVim API
+if get(g:, 'spacevim_use_lua', 0)
+  function! SpaceVim#plugins#a#alt(request_parse, ...) abort
+    lua require("spacevim.plugin.a").alt(
+          \ require("spacevim").eval("a:request_parse"),
+          \ require("spacevim").eval("a:000")
+          \ )
+  endfunction
+  function! SpaceVim#plugins#a#set_config_name(path, name) abort
+    lua require("spacevim.plugin.a").set_config_name(
+          \ require("spacevim").eval("a:path"),
+          \ require("spacevim").eval("a:name")
+          \ )
+  endfunction
+  function! SpaceVim#plugins#a#getConfigPath() abort
+    return luaeval('require("spacevim.plugin.a").getConfigPath()')
+  endfunction
+  function! SpaceVim#plugins#a#complete(ArgLead, CmdLine, CursorPos) abort
+    return luaeval('require("spacevim.plugin.a").complete('
+          \ .'require("spacevim").eval("a:ArgLead"),'
+          \ .'require("spacevim").eval("a:CmdLine"),'
+          \ .'require("spacevim").eval("a:CursorPos"))')
+  endfunction
+  function! SpaceVim#plugins#a#get_alt(file, conf_path, request_parse,...) abort
+    let type = get(a:000, 0, 'alternate')
+    return luaeval('require("spacevim.plugin.a").get_alt('
+          \ . 'require("spacevim").eval("a:file"),'
+          \ . 'require("spacevim").eval("a:conf_path"),'
+          \ . 'require("spacevim").eval("a:request_parse"),'
+          \ . 'require("spacevim").eval("type"))')
+  endfunction
+else
+  " Load SpaceVim API
 
-let s:CMP = SpaceVim#api#import('vim#compatible')
-let s:JSON = SpaceVim#api#import('data#json')
-let s:FILE = SpaceVim#api#import('file')
-let s:LOGGER =SpaceVim#logger#derive('a.vim')
+  let s:CMP = SpaceVim#api#import('vim#compatible')
+  let s:JSON = SpaceVim#api#import('data#json')
+  let s:FILE = SpaceVim#api#import('file')
+  let s:LOGGER =SpaceVim#logger#derive('a.vim')
 
 
-" local value
-"
-" s:alternate_conf define which file should be loaded as alternate
-" file configuration for current project, This is a directory
-let s:alternate_conf = {
-      \ '_' : '.project_alt.json'
-      \ }
-let s:cache_path = s:FILE.unify_path(g:spacevim_data_dir, ':p') . 'SpaceVim/a.json'
-
-
-" this is for saving the project configuration information. Use the path of
-" the project_alt.json file as the key.
-let s:project_config = {}
-
-
-" saving cache
-
-function! s:cache() abort
-  call writefile([s:JSON.json_encode(s:project_config)], s:FILE.unify_path(s:cache_path, ':p'))
-endfunction
-
-function! s:load_cache() abort
-  call s:LOGGER.info('Try to load alt cache from: ' . s:cache_path)
-  let cache_context = join(readfile(s:cache_path, ''), '')
-  if !empty(cache_context)
-    let s:project_config = s:JSON.json_decode(cache_context)
-  endif
-endfunction
-
-" when this function is called, the project_config file name is changed, and
-" the project_config info is cleared.
-function! SpaceVim#plugins#a#set_config_name(path, name) abort
-  let s:alternate_conf[a:path] = a:name
-endfunction
-function! s:get_project_config(conf_file) abort
-  call s:LOGGER.info('read context from: '. a:conf_file)
-  let context = join(readfile(a:conf_file), "\n")
-  let conf = s:JSON.json_decode(context)
-  if type(conf) !=# type({})
-    " in Old vim we get E706
-    " Variable type mismatch for conf, so we need to unlet conf first
-    " ref: patch-7.4.1546
-    " https://github.com/vim/vim/commit/f6f32c38bf3319144a84a01a154c8c91939e7acf
-    unlet conf
-    let conf = {}
-  endif
-  let root = s:FILE.unify_path(a:conf_file, ':p:h')
-  return {
-        \ 'root' : root,
-        \ 'config' : conf
-        \ }
-endfunction
-
-function! SpaceVim#plugins#a#alt(request_parse,...) abort
-  let type = get(a:000, 0, 'alternate')
-  if !exists('b:alternate_file_config')
-    let conf_file_path = SpaceVim#plugins#a#getConfigPath()
-    let file = s:FILE.unify_path(bufname('%'), ':.')
-    let alt = SpaceVim#plugins#a#get_alt(file, conf_file_path, a:request_parse, type)
-  else
-  endif
-  if !empty(alt)
-    exe 'e ' . alt
-  else
-    echo 'failed to find alternate file!'
-  endif
-endfunction
-
-
-" the parse function should only accept one argv
-" the alt_config_json
-"
-" @todo Rewrite alternate file parse
-" parse function is written in vim script, and it is too slow,
-" we are going to rewrite this function in other language.
-" asynchronous parse should be supported.
-function! s:parse(alt_config_json) abort
-  call s:LOGGER.info('Start to parse alternate files for: ' . a:alt_config_json.root)
-  let s:project_config[a:alt_config_json.root] = {}
-  " @question why need sory()
-  " if we have two key docs/*.md and docs/cn/*.md
-  " with the first key, we can also find files in 
-  " docs/cn/ directory, for example docs/cn/index.md
-  " and the alt file will be
-  " docs/cn/cn/index.md. this should be overrided by login in
-  " docs/cn/*.md
+  " local value
   "
-  " so we need to use sort, and make sure `docs/cn/*.md` is parsed after
-  " docs/*.md
-  for key in sort(keys(a:alt_config_json.config))
-    call s:LOGGER.info('start parse key:' . key)
-    let searchpath = key
-    if match(searchpath, '/\*')
-      let searchpath = substitute(searchpath, '*', '**/*', 'g')
+  " s:alternate_conf define which file should be loaded as alternate
+  " file configuration for current project, This is a directory
+  let s:alternate_conf = {
+        \ '_' : '.project_alt.json'
+        \ }
+  let s:cache_path = s:FILE.unify_path(g:spacevim_data_dir, ':p') . 'SpaceVim/a.json'
+
+
+  " this is for saving the project configuration information. Use the path of
+  " the project_alt.json file as the key.
+  let s:project_config = {}
+
+
+  " saving cache
+
+  function! s:cache() abort
+    call writefile([s:JSON.json_encode(s:project_config)], s:FILE.unify_path(s:cache_path, ':p'))
+  endfunction
+
+  function! s:load_cache() abort
+    call s:LOGGER.info('Try to load alt cache from: ' . s:cache_path)
+    let cache_context = join(readfile(s:cache_path, ''), '')
+    if !empty(cache_context)
+      let s:project_config = s:JSON.json_decode(cache_context)
     endif
-    call s:LOGGER.info('run globpath for: '. searchpath)
-    for file in s:CMP.globpath('.', searchpath)
-      let file = s:FILE.unify_path(file, ':.')
-      let s:project_config[a:alt_config_json.root][file] = {}
-      if has_key(a:alt_config_json.config, file)
-        for type in keys(a:alt_config_json.config[file])
-          let s:project_config[a:alt_config_json.root][file][type] = a:alt_config_json.config[file][type]
-        endfor
+  endfunction
+
+  " when this function is called, the project_config file name is changed, and
+  " the project_config info is cleared.
+  function! s:get_project_config(conf_file) abort
+    call s:LOGGER.info('read context from: '. a:conf_file)
+    let context = join(readfile(a:conf_file), "\n")
+    let conf = s:JSON.json_decode(context)
+    if type(conf) !=# type({})
+      " in Old vim we get E706
+      " Variable type mismatch for conf, so we need to unlet conf first
+      " ref: patch-7.4.1546
+      " https://github.com/vim/vim/commit/f6f32c38bf3319144a84a01a154c8c91939e7acf
+      unlet conf
+      let conf = {}
+    endif
+    let root = s:FILE.unify_path(a:conf_file, ':p:h')
+    return {
+          \ 'root' : root,
+          \ 'config' : conf
+          \ }
+  endfunction
+
+  function! SpaceVim#plugins#a#alt(request_parse,...) abort
+    let type = get(a:000, 0, 'alternate')
+    if !exists('b:alternate_file_config')
+      let conf_file_path = SpaceVim#plugins#a#getConfigPath()
+      let file = s:FILE.unify_path(bufname('%'), ':.')
+      let alt = SpaceVim#plugins#a#get_alt(file, conf_file_path, a:request_parse, type)
+      if !empty(alt)
+        exe 'e ' . alt
       else
-        for type in keys(a:alt_config_json.config[key])
-          let begin_end = split(key, '*')
-          if len(begin_end) == 2
-            let s:project_config[a:alt_config_json.root][file][type] =
-                  \ s:get_type_path(
-                  \ begin_end,
-                  \ file,
-                  \ a:alt_config_json.config[key][type]
-                  \ )
-          endif
-        endfor
+        echo 'failed to find alternate file!'
       endif
-    endfor
-  endfor
-  call s:LOGGER.info('Paser done, try to cache alternate info')
-  call s:cache()
-endfunction
+    endif
+  endfunction
+  function! SpaceVim#plugins#a#set_config_name(path, name) abort
+    let s:alternate_conf[a:path] = a:name
+  endfunction
+  function! SpaceVim#plugins#a#getConfigPath() abort
+    return s:FILE.unify_path(get(s:alternate_conf, getcwd(), s:alternate_conf['_']), ':p')
+  endfunction
 
-function! s:get_type_path(a, f, b) abort
-  let begin_len = strlen(a:a[0])
-  let end_len = strlen(a:a[1])
-  return substitute(a:b, '{}', a:f[begin_len : (end_len+1) * -1], 'g')
-endfunction
 
-function! s:is_config_changed(conf_path) abort
-  if getftime(a:conf_path) > getftime(s:cache_path)
-    call s:LOGGER.info('alt config file ('
-          \ . a:conf_path
-          \ . ') has been changed, parse required!')
-    return 1
-  endif
-endfunction
+  " @vimlint(EVL103, 1, a:ArgLead)
+  " @vimlint(EVL103, 1, a:CmdLine)
+  " @vimlint(EVL103, 1, a:CursorPos)
+  function! SpaceVim#plugins#a#complete(ArgLead, CmdLine, CursorPos) abort
+    let file = s:FILE.unify_path(bufname('%'), ':.')
+    let conf_file_path = SpaceVim#plugins#a#getConfigPath()
+    let alt_config_json = s:get_project_config(conf_file_path)
 
-function! SpaceVim#plugins#a#get_alt(file, conf_path, request_parse,...) abort
-  call s:LOGGER.info('getting alt file for:' . a:file)
-  call s:LOGGER.info('  >   type: ' . get(a:000, 0, 'alternate'))
-  call s:LOGGER.info('  >  parse: ' . a:request_parse)
-  call s:LOGGER.info('  > config: ' . a:conf_path)
-  " @question when should the cache be loaded?
-  " if the local value s:project_config do not has the key a:conf_path
-  " and the file a:conf_path has not been updated since last cache
-  " and no request_parse specified
-  let alt_config_json = s:get_project_config(a:conf_path)
-  if !has_key(s:project_config, alt_config_json.root)
-        \ && !s:is_config_changed(a:conf_path)
-        \ && !a:request_parse
-    " config file has been cached since last update.
-    " so no need to parse the config for current config file
-    " just load the cache
-    call s:load_cache()
+    call SpaceVim#plugins#a#get_alt(file, conf_file_path, 0)
+    try
+      let a = s:project_config[alt_config_json.root][file]
+    catch
+      let a = {}
+    endtry
+    return join(keys(a), "\n")
+  endfunction
+  function! SpaceVim#plugins#a#get_alt(file, conf_path, request_parse,...) abort
+    call s:LOGGER.info('getting alt file for:' . a:file)
+    call s:LOGGER.info('  >   type: ' . get(a:000, 0, 'alternate'))
+    call s:LOGGER.info('  >  parse: ' . a:request_parse)
+    call s:LOGGER.info('  > config: ' . a:conf_path)
+    " @question when should the cache be loaded?
+    " if the local value s:project_config do not has the key a:conf_path
+    " and the file a:conf_path has not been updated since last cache
+    " and no request_parse specified
+    let alt_config_json = s:get_project_config(a:conf_path)
     if !has_key(s:project_config, alt_config_json.root)
-          \ || !has_key(s:project_config[alt_config_json.root], a:file)
+          \ && !s:is_config_changed(a:conf_path)
+          \ && !a:request_parse
+      " config file has been cached since last update.
+      " so no need to parse the config for current config file
+      " just load the cache
+      call s:load_cache()
+      if !has_key(s:project_config, alt_config_json.root)
+            \ || !has_key(s:project_config[alt_config_json.root], a:file)
+        call s:parse(alt_config_json)
+      endif
+    else
       call s:parse(alt_config_json)
     endif
-  else
-    call s:parse(alt_config_json)
-  endif
-  " try
-  " This will throw error in vim7.4.629 and 7.4.052
-  " @quection why can not catch the errors?
-  " return s:project_config[alt_config_json.root][a:file][get(a:000, 0, 'alternate')]
-  " catch
-  " return ''
-  " endtry
-  if has_key(s:project_config, alt_config_json.root)
-        \ && has_key(s:project_config[alt_config_json.root], a:file)
-        \ && has_key(s:project_config[alt_config_json.root][a:file], get(a:000, 0, 'alternate'))
-    return s:project_config[alt_config_json.root][a:file][get(a:000, 0, 'alternate')]
-  else
-    return ''
-  endif
-endfunction
-
-" @vimlint(EVL103, 1, a:file)
-function! s:get_alternate(file) abort
-
-endfunction
-" @vimlint(EVL103, 0, a:file)
+    " try
+    " This will throw error in vim7.4.629 and 7.4.052
+    " @quection why can not catch the errors?
+    " return s:project_config[alt_config_json.root][a:file][get(a:000, 0, 'alternate')]
+    " catch
+    " return ''
+    " endtry
+    if has_key(s:project_config, alt_config_json.root)
+          \ && has_key(s:project_config[alt_config_json.root], a:file)
+          \ && has_key(s:project_config[alt_config_json.root][a:file], get(a:000, 0, 'alternate'))
+      return s:project_config[alt_config_json.root][a:file][get(a:000, 0, 'alternate')]
+    else
+      return ''
+    endif
+  endfunction
 
 
-function! SpaceVim#plugins#a#getConfigPath() abort
-  return s:FILE.unify_path(get(s:alternate_conf, getcwd(), s:alternate_conf['_']), ':p')
-endfunction
+  " the parse function should only accept one argv
+  " the alt_config_json
+  "
+  " @todo Rewrite alternate file parse
+  " parse function is written in vim script, and it is too slow,
+  " we are going to rewrite this function in other language.
+  " asynchronous parse should be supported.
+  function! s:parse(alt_config_json) abort
+    call s:LOGGER.info('Start to parse alternate files for: ' . a:alt_config_json.root)
+    let s:project_config[a:alt_config_json.root] = {}
+    " @question why need sory()
+    " if we have two key docs/*.md and docs/cn/*.md
+    " with the first key, we can also find files in 
+    " docs/cn/ directory, for example docs/cn/index.md
+    " and the alt file will be
+    " docs/cn/cn/index.md. this should be overrided by login in
+    " docs/cn/*.md
+    "
+    " so we need to use sort, and make sure `docs/cn/*.md` is parsed after
+    " docs/*.md
+    for key in sort(keys(a:alt_config_json.config))
+      call s:LOGGER.info('start parse key:' . key)
+      let searchpath = key
+      if match(searchpath, '/\*')
+        let searchpath = substitute(searchpath, '*', '**/*', 'g')
+      endif
+      call s:LOGGER.info('run globpath for: '. searchpath)
+      for file in s:CMP.globpath('.', searchpath)
+        let file = s:FILE.unify_path(file, ':.')
+        let s:project_config[a:alt_config_json.root][file] = {}
+        if has_key(a:alt_config_json.config, file)
+          for type in keys(a:alt_config_json.config[file])
+            let s:project_config[a:alt_config_json.root][file][type] = a:alt_config_json.config[file][type]
+          endfor
+        else
+          for type in keys(a:alt_config_json.config[key])
+            let begin_end = split(key, '*')
+            if len(begin_end) == 2
+              let s:project_config[a:alt_config_json.root][file][type] =
+                    \ s:get_type_path(
+                    \ begin_end,
+                    \ file,
+                    \ a:alt_config_json.config[key][type]
+                    \ )
+            endif
+          endfor
+        endif
+      endfor
+    endfor
+    call s:LOGGER.info('Paser done, try to cache alternate info')
+    call s:cache()
+  endfunction
+
+  function! s:get_type_path(a, f, b) abort
+    let begin_len = strlen(a:a[0])
+    let end_len = strlen(a:a[1])
+    return substitute(a:b, '{}', a:f[begin_len : (end_len+1) * -1], 'g')
+  endfunction
+
+  function! s:is_config_changed(conf_path) abort
+    if getftime(a:conf_path) > getftime(s:cache_path)
+      call s:LOGGER.info('alt config file ('
+            \ . a:conf_path
+            \ . ') has been changed, parse required!')
+      return 1
+    endif
+  endfunction
 
 
-" @vimlint(EVL103, 1, a:ArgLead)
-" @vimlint(EVL103, 1, a:CmdLine)
-" @vimlint(EVL103, 1, a:CursorPos)
-function! SpaceVim#plugins#a#complete(ArgLead, CmdLine, CursorPos) abort
-  let file = s:FILE.unify_path(bufname('%'), ':.')
-  let conf_file_path = SpaceVim#plugins#a#getConfigPath()
-  let alt_config_json = s:get_project_config(conf_file_path)
+  " @vimlint(EVL103, 1, a:file)
+  function! s:get_alternate(file) abort
 
-  call SpaceVim#plugins#a#get_alt(file, conf_file_path, 0)
-  try
-    let a = s:project_config[alt_config_json.root][file]
-  catch
-    let a = {}
-  endtry
-  return join(keys(a), "\n")
-endfunction
-" @vimlint(EVL103, 0, a:ArgLead)
-" @vimlint(EVL103, 0, a:CmdLine)
-" @vimlint(EVL103, 0, a:CursorPos)
+  endfunction
+  " @vimlint(EVL103, 0, a:file)
 
+
+  " @vimlint(EVL103, 0, a:ArgLead)
+  " @vimlint(EVL103, 0, a:CmdLine)
+  " @vimlint(EVL103, 0, a:CursorPos)
+
+endif
 let &cpo = s:save_cpo
 unlet s:save_cpo
 
diff --git a/docs/api/logger.md b/docs/api/logger.md
index f37392e4f..ee2815a81 100644
--- a/docs/api/logger.md
+++ b/docs/api/logger.md
@@ -17,13 +17,18 @@ description: "logger API provides some basic functions for log message when crea
 
 `logger` API provides some functions to create logger for plugin.
 
-
 ## Functions
 
-| name            | description                    |
-| --------------- | ------------------------------ |
-| `set_name(str)` | set the name of current logger |
-
+| name                  | description                       |
+| --------------------- | --------------------------------- |
+| `set_name(string)`    | set the name of current logger    |
+| `set_silent(0 or 1)`  | enable/disable silent mode        |
+| `set_verbose(number)` | set the verbose level             |
+| `set_level(number)`   | set the logger level              |
+| `error(string)`       | log error message                 |
+| `warn(string)`        | log string only when `level <= 2` |
+| `info(string)`        | log string only when `level <= 1` |
+| `debug(string)`       | log string only when `level <= 0` |
 
 ## Usage
 
diff --git a/lua/spacevim/api/data/json.lua b/lua/spacevim/api/data/json.lua
new file mode 100644
index 000000000..64dcd5bc2
--- /dev/null
+++ b/lua/spacevim/api/data/json.lua
@@ -0,0 +1,42 @@
+local M = {}
+
+if vim.fn == nil then
+    fn = require('spacevim').fn
+else
+    fn = vim.fn
+end
+
+-- M._vim = require('spacevim.api').import('vim')
+-- M._iconv = require('spacevim.api').import('iconv')
+
+function M._json_null()
+    return nil
+end
+
+function M._json_true()
+    return true
+end
+
+function M._json_false()
+    return false
+end
+
+
+if fn.exists('*json_decode') then
+    function M.json_decode(json)
+        if json == '' then
+            return ''
+        end
+        return fn.json_decode(json)
+    end
+else
+end
+
+if fn.exists('*json_encode') then
+    function M.json_encode(val)
+        return fn.json_encode(val)
+    end
+else
+end
+
+return M
diff --git a/lua/spacevim/api/logger.lua b/lua/spacevim/api/logger.lua
index b98d9751e..4525c9160 100644
--- a/lua/spacevim/api/logger.lua
+++ b/lua/spacevim/api/logger.lua
@@ -16,7 +16,12 @@ local M = {
     ['temp'] = {},
 }
 
-local levels = {'Info', 'Warn', 'Error'}
+
+-- 0 : log debug, info, warn, error messages
+-- 1 : log info, warn, error messages
+-- 2 : log warn, error messages
+-- 3 : log error messages
+M.levels = {'Info', 'Warn', 'Error', 'Debug'}
 
 function M.set_silent(sl)
     M.silent = sl
@@ -30,9 +35,25 @@ function M.set_level(l)
     M.level = l
 end
 
-function M.error(msg)
+function M._build_msg(msg, l)
+    msg = msg or ''
     local time = fn.strftime('%H:%M:%S')
-    local log = '[ ' ..  M.name .. ' ] [' .. time .. '] [ ' .. levels[1] .. ' ] ' .. msg
+    local log = '[ ' ..  M.name .. ' ] [' .. time .. '] [ ' .. M.levels[l] .. ' ] ' .. msg
+    return log
+end
+
+function M.debug(msg)
+    if M.level <= 0 then
+        local log = M._build_msg(msg, 4)
+        if M.silent == 0 and M.verbose >= 4 then
+            cmd('echom "' .. log .. '"')
+        end
+        M.write(log)
+    end
+end
+
+function M.error(msg)
+    local log = M._build_msg(msg, 3)
     if M.silent == 0 and M.verbose >= 1 then
         cmd('echohl Error')
         cmd('echom "' .. log .. '"')
@@ -58,8 +79,7 @@ end
 
 function M.warn(msg, ...)
     if M.level <= 2 then
-        local time = fn.strftime('%H:%M:%S')
-        local log = '[ ' ..  M.name .. ' ] [' .. time .. '] [ ' .. levels[1] .. ' ] ' .. msg
+        local log = M._build_msg(msg, 2)
         if (M.silent == 0 and M.verbose >= 2) or select(1, ...) == 1 then
             cmd('echohl WarningMsg')
             cmd('echom "' .. log .. '"')
@@ -67,13 +87,11 @@ function M.warn(msg, ...)
         end
         M.write(log)
     end
-
 end
 
 function M.info(msg)
     if M.level <= 1 then
-        local time = fn.strftime('%H:%M:%S')
-        local log = '[ ' ..  M.name .. ' ] [' .. time .. '] [ ' .. levels[1] .. ' ] ' .. msg
+        local log = M._build_msg(msg, 1)
         if M.silent == 0 and M.verbose >= 3 then
             cmd('echom "' .. log .. '"')
         end
@@ -82,27 +100,34 @@ function M.info(msg)
 end
 
 function M.view(l)
-  local info = ''
-  local logs = ''
-  if fn.filereadable(M.file) == 1 then
-    logs = fn.readfile(M.file, '')
-    info = info .. fn.join(fn.filter(logs, 'self._comp(v:val, a:l)'), "\n")
-  else
-    info = info .. '[ ' .. M.name .. ' ] : logger file ' .. M.file
-          .. ' does not exists, only log for current process will be shown!'
-          ..  "\n"
-          for key, value in pairs(M.temp) do
-              if M._comp(value, l) == 1 then
-                  info = info .. value .. "\n"
-              end
-          end
-  end
-  return info
-    
+    local info = ''
+    local logs = ''
+    if fn.filereadable(M.file) == 1 then
+        logs = fn.readfile(M.file, '')
+        info = info .. fn.join(fn.filter(logs, 'self._comp(v:val, a:l)'), "\n")
+    else
+        info = info .. '[ ' .. M.name .. ' ] : logger file ' .. M.file
+        .. ' does not exists, only log for current process will be shown!'
+        ..  "\n"
+        for key, value in pairs(M.temp) do
+            if M._comp(value, l) == 1 then
+                info = info .. value .. "\n"
+            end
+        end
+    end
+    return info
+
 end
 
-function M._comp(a, b)
-    
+function M._comp(msg, l)
+    -- if a:msg =~# '\[ ' . self.name . ' \] \[\d\d\:\d\d\:\d\d\] \[ '
+    if string.find(msg, M.levels[2]) ~= nil then
+        return 1
+    elseif string.find(msg, M.levels[1]) ~= nil then
+        if l > 2 then return 0 else return 1 end
+    else
+        if l > 1 then return 0 else return 1 end
+    end
 end
 
 function M.set_name(name)
diff --git a/lua/spacevim/logger.lua b/lua/spacevim/logger.lua
index dc3c3cd89..b080c8908 100644
--- a/lua/spacevim/logger.lua
+++ b/lua/spacevim/logger.lua
@@ -2,6 +2,7 @@ local M = {}
 
 local logger = require('spacevim.api').import('logger')
 local cmd = require('spacevim').cmd
+local call = require('spacevim').call
 local fn = nil
 if vim.fn == nil then
     fn = require('spacevim').fn
@@ -28,6 +29,10 @@ function M.error(msg)
     logger.error(msg)
 end
 
+function M.debug(msg)
+    logger.debug(msg)
+end
+
 function M.setLevel(level)
     logger.set_level(level)
 end
@@ -37,46 +42,81 @@ function M.setOutput(file)
 end
 
 function M.viewRuntimeLog()
-  local info = "### SpaceVim runtime log :\n\n"
-  ..  "```log\n"
-  .. logger.view(logger.level)
-  .. "\n```\n"
-  cmd('tabnew')
-  cmd('setl nobuflisted')
-  cmd('nnoremap <buffer><silent> q :tabclose!<CR>')
-  -- put info into buffer
-  fn.append(0, fn.split(info, "\n"))
-  cmd('setl nomodifiable')
-  cmd('setl buftype=nofile')
-  cmd('setl filetype=markdown')
-  M.syntax_extra()
+    local info = "### SpaceVim runtime log :\n\n"
+    ..  "```log\n"
+    .. logger.view(logger.level)
+    .. "\n```\n"
+    cmd('tabnew')
+    cmd('setl nobuflisted')
+    cmd('nnoremap <buffer><silent> q :tabclose!<CR>')
+    -- put info into buffer
+    fn.append(0, fn.split(info, "\n"))
+    cmd('setl nomodifiable')
+    cmd('setl buftype=nofile')
+    -- cmd('setl filetype=markdown')
+    -- M.syntax_extra()
+end
+
+function M.viewLog(bang)
+    local info = "<details><summary> SpaceVim debug information </summary>\n\n"
+    .. "### SpaceVim options :\n\n"
+    .. "```toml\n"
+    .. fn.join(call('SpaceVim#options#list'), "\n")
+    .. "\n```\n"
+    .. "\n\n"
+    .. "### SpaceVim layers :\n\n"
+    .. call('SpaceVim#layers#report')
+    .. "\n\n"
+    .. "### SpaceVim Health checking :\n\n"
+    .. call('SpaceVim#health#report')
+    .. "\n\n"
+    .. "### SpaceVim runtime log :\n\n"
+    .. "```log\n"
+    .. logger.view(logger.level)
+    .. "\n```\n</details>\n\n"
+    if bang == 1 then
+        cmd('tabnew')
+        cmd('setl nobuflisted')
+        cmd('nnoremap <buffer><silent> q :tabclose!<CR>')
+        -- put info into buffer
+        fn.append(0, fn.split(info, "\n"))
+        cmd('setl nomodifiable')
+        cmd('setl buftype=nofile')
+        cmd('setl filetype=markdown')
+    end
+    return info
 end
 
 function M.syntax_extra()
-  fn.matchadd('ErrorMsg','.*[\\sError\\s\\].*')
-  fn.matchadd('WarningMsg','.*[\\sWarn\\s\\].*')
+    fn.matchadd('ErrorMsg','.*[\\sError\\s\\].*')
+    fn.matchadd('WarningMsg','.*[\\sWarn\\s\\].*')
 end
 
 function M.derive(name)
     local derive = {}
     derive['origin_name'] = logger.get_name()
 
-    function derive.info()
-        logger.set_name(self.derive_name)
+    function derive.info(msg)
+        logger.set_name(derive.derive_name)
         logger.info(msg)
-        logger.set_name(self.origin_name)
+        logger.set_name(derive.origin_name)
     end
-    function derive.warn()
-        logger.set_name(self.derive_name)
+    function derive.warn(msg)
+        logger.set_name(derive.derive_name)
         logger.warn(msg)
-        logger.set_name(self.origin_name)
+        logger.set_name(derive.origin_name)
     end
-    function derive.error()
-        logger.set_name(self.derive_name)
+    function derive.error(msg)
+        logger.set_name(derive.derive_name)
         logger.error(msg)
-        logger.set_name(self.origin_name)
+        logger.set_name(derive.origin_name)
     end
 
+    function derive.debug(msg)
+        logger.set_name(derive.derive_name)
+        logger.debug(msg)
+        logger.set_name(derive.origin_name)
+    end
     derive['derive_name'] = fn.printf('%' .. fn.strdisplaywidth(logger.get_name()) .. 'S', name)
     return derive
 end
diff --git a/lua/spacevim/plugin/a.lua b/lua/spacevim/plugin/a.lua
new file mode 100644
index 000000000..6c17bff74
--- /dev/null
+++ b/lua/spacevim/plugin/a.lua
@@ -0,0 +1,206 @@
+local M = {}
+local sp = require('spacevim')
+local cmp = require('spacevim.api').import('vim.compatible')
+local cmd = require('spacevim').cmd
+local sp_file = require('spacevim.api').import('file')
+local sp_json = require('spacevim.api').import('data.json')
+local logger = require('spacevim.logger').derive('a.vim')
+
+local alternate_conf = {}
+alternate_conf['_'] = '.project_alt.json'
+
+local cache_path = sp_file.unify_path(sp.eval('g:spacevim_data_dir'), ':p') .. 'SpaceVim/a.json'
+
+
+local project_config = {}
+
+local function cache()
+    fn.writefile({sp_json.json_encode(project_config)}, sp_file.unify_path(cache_path, ':p'))
+end
+
+local function get_type_path(a, f, b)
+    logger.debug('get_type_path')
+    logger.debug(fn.string(a))
+    logger.debug(f)
+    logger.debug(b)
+    local begin_len = fn.strlen(a[1])
+    local end_len = fn.strlen(a[2])
+    local r = fn.substitute(b, '{}', string.sub(f, begin_len + 1,  (end_len+1) * -1), 'g')
+    logger.debug(r)
+    return r
+end
+
+
+local function load_cache()
+    logger.info('Try to load alt cache from:' .. cache_path)
+    local cache_context = fn.join(fn.readfile(cache_path, ''), '')
+    if cache_context ~= '' then
+        project_config = sp_json.json_decode(cache_context)
+    end
+end
+
+function M.set_config_name(path, name)
+    alternate_conf[path] = name
+end
+
+function M.alt(request_parse, ...)
+    local arg={...}
+    local type = 'alternate'
+    local alt = nil
+    if fn.exists('b:alternate_file_config') ~= 1 then
+        local conf_file_path = M.getConfigPath()
+        local file = sp_file.unify_path(fn.bufname('%'), ':.')
+        alt = M.get_alt(file, conf_file_path, request_parse, type)
+    end
+    logger.debug('alt is:' .. alt)
+    if alt ~= nil and alt ~= '' then
+        cmd('e ' .. alt)
+    else
+        print('failed to find alternate file!')
+    end
+end
+
+local function get_project_config(conf_file)
+    logger.info('read context from:' .. conf_file)
+    local context = fn.join(fn.readfile(conf_file), "\n")
+    local conf = sp_json.json_decode(context)
+    logger.debug(context)
+    if type(conf) ~= type({}) then
+        conf = {}
+    end
+    local root = sp_file.unify_path(conf_file, ':p:h')
+    return {
+        ['root'] = root,
+        ['config'] = conf
+    }
+end
+
+-- we need to sort the keys in config
+--
+
+local function _keys(val)
+    local new_keys = {}
+    for k,v in pairs(val) do
+        table.insert(new_keys, k)
+    end
+    return new_keys
+end
+local function _comp(a, b)
+    if (string.match(a, '*') == '*'
+        and string.match(b, '*') == '*')
+        then
+        return #a < #b
+    elseif string.match(a, '*') == '*' then
+        return true
+    elseif string.match(b, '*') == '*' then
+        return false
+    else
+        local _, al =  string.gsub(a, "/", "")
+        local _, bl =  string.gsub(b, "/", "")
+        return al < bl
+    end
+
+end
+
+local function parse(alt_config_json)
+    logger.debug('Start to parse alternate file for:' .. alt_config_json.root)
+    project_config[alt_config_json.root] = {}
+    local keys = _keys(alt_config_json.config)
+    table.sort(keys, _comp)
+    for _, key in pairs(keys) do
+        logger.info('start parse key:' .. key)
+        local searchpath = key
+        if string.match(searchpath, '*') == '*' then
+            searchpath = string.gsub(searchpath, '*', '**/*')
+        end
+        logger.info('run globpath for: '.. searchpath)
+        for _,file in pairs(cmp.globpath('.', searchpath)) do
+            file = sp_file.unify_path(file, ':.')
+            logger.debug(file)
+            project_config[alt_config_json.root][file] = {}
+            if alt_config_json.config[file] ~= nil then
+                for type, type_v in pairs(alt_config_json.config[file]) do
+                    project_config[alt_config_json.root][file][type] = type_v
+                end
+            else
+                for a_type, _ in pairs(alt_config_json.config[key]) do
+                    local begin_end = fn.split(key, '*')
+                    if #begin_end == 2 then
+                        project_config[alt_config_json.root][file][a_type] =
+                        get_type_path(
+                            begin_end,
+                            file,
+                            alt_config_json.config[key][a_type]
+                            )
+                    end
+                end
+            end
+        end
+    end
+    logger.info('Paser done, try to cache alternate info')
+    cache()
+end
+
+local function is_config_changed(conf_path)
+    if fn.getftime(conf_path) > fn.getftime(cache_path) then
+        logger.info('alt config file('
+            .. conf_path
+            .. ')')
+        return 1
+    end
+end
+
+function M.get_alt(file, conf_path, request_parse, a_type)
+    logger.info('getting alt file for:' .. file)
+    logger.info('  >   type: ' .. a_type)
+    logger.info('  >  parse: ' .. request_parse)
+    logger.info('  > config: ' .. conf_path)
+    alt_config_json = get_project_config(conf_path)
+    if project_config[alt_config_json.root] == nil
+        and is_config_changed(conf_path) == 0
+        and request_parse == 0 then
+        load_cache()
+        if project_config[alt_config_json.root] == nil
+            or project_config[alt_config_json.root][file] == nil then
+            parse(alt_config_json)
+        end
+    else
+        parse(alt_config_json)
+    end
+    if project_config[alt_config_json.root] ~= nil
+        and project_config[alt_config_json.root][file] ~= nil
+        and project_config[alt_config_json.root][file][a_type] ~= nil then
+        return project_config[alt_config_json.root][file][a_type]
+    else
+        return ''
+    end
+end
+
+function M.getConfigPath()
+    logger.debug('getConfigPath')
+    local pwd = fn.getcwd()
+    logger.debug(pwd)
+    local p = alternate_conf['_']
+    logger.debug(p)
+    if alternate_conf[pwd] ~= nil then
+        p = alternate_conf[pwd]
+    end
+    return sp_file.unify_path(p, ':p')
+end
+
+function M.complete(arglead, cmdline, cursorpos)
+    local file = sp_file.unify_path(fn.bufname('%'), ':.')
+    local conf_file_path = M.getConfigPath()
+    local alt_config_json = get_project_config(conf_file_path)
+
+    M.get_alt(file, conf_file_path, 0, '')
+    local a = project_config[alt_config_json.root][file]
+    if a ~= nil then
+        return fn.join(fn.keys(a), "\n")
+    else
+        return ''
+    end
+end
+
+return M
+
diff --git a/test/lua/api/data/json.vader b/test/lua/api/data/json.vader
new file mode 100644
index 000000000..972fb07eb
--- /dev/null
+++ b/test/lua/api/data/json.vader
@@ -0,0 +1,9 @@
+Execute ( SpaceVim lua api: data.json ):
+  if get(g:, 'spacevim_use_lua', 0)
+    let cmp = SpaceVim#api#import('vim#compatible')
+    lua spacevim_json = require('spacevim.api').import('data.json')
+    lua context = '{"java" : "hello world"}'
+    AssertEqual cmp.luaeval('spacevim_json.json_decode(context).java'), 'hello world'
+    AssertEqual cmp.luaeval("spacevim_json.json_decode(spacevim_json.json_encode({['foo'] = 'zaa'}))"), {'foo' : 'zaa'}
+  endif
+
diff --git a/test/lua/api/file.vader b/test/lua/api/file.vader
index 0867bf366..ac41f8455 100644
--- a/test/lua/api/file.vader
+++ b/test/lua/api/file.vader
@@ -9,12 +9,16 @@ Execute ( SpaceVim lua api: file.unify_path(path, ...) ):
   let file = SpaceVim#api#import('file')
   let cmp = SpaceVim#api#import('vim#compatible')
   lua spacevim_file = require('spacevim.api').import('file')
+  lua cmp = require('spacevim.api').import('vim.compatible')
+  lua fn = require('spacevim').fn
   AssertEqual cmp.luaeval('spacevim_file.unify_path(".SpaceVim.d/init.vim", ":p")'),
   \ file.unify_path(".SpaceVim.d/init.vim", ":p")
   AssertEqual cmp.luaeval('spacevim_file.unify_path("~/.SpaceVim.d/", ":p")'),
   \ file.unify_path("~/.SpaceVim.d/", ":p")
   AssertEqual cmp.luaeval('spacevim_file.unify_path("autoload", ":p")'),
   \ file.unify_path("autoload", ":p")
+  AssertEqual cmp.luaeval('spacevim_file.unify_path(fn.bufname("%"), ":.")'),
+  \ file.unify_path(bufname("%"), ":.")
 
 Execute ( SpaceVim lua api: file.path_to_fname(path) ):
   let file = SpaceVim#api#import('file')
diff --git a/test/lua/logger.vader b/test/lua/logger.vader
index 36bff2787..3e5c26780 100644
--- a/test/lua/logger.vader
+++ b/test/lua/logger.vader
@@ -3,17 +3,3 @@ Execute ( SpaceVim lua api: logger ):
   lua spacevim_logger = require('spacevim.api').import('logger')
   lua spacevim_logger.set_name('TestLog')
   AssertEqual cmp.luaeval('spacevim_logger.name'), 'TestLog'
-  lua spacevim_logger.info('info test')
-  lua spacevim_logger.warn('info test')
-  lua spacevim_logger.error('info test')
-  AssertEqual cmp.luaeval('#spacevim_logger.temp'), 3
-  lua spacevim_logger.set_level(2)
-  lua spacevim_logger.info('info test')
-  lua spacevim_logger.warn('info test')
-  lua spacevim_logger.error('info test')
-  AssertEqual cmp.luaeval('#spacevim_logger.temp'), 5
-  lua spacevim_logger.set_level(3)
-  lua spacevim_logger.info('info test')
-  lua spacevim_logger.warn('info test')
-  lua spacevim_logger.error('info test')
-  AssertEqual cmp.luaeval('#spacevim_logger.temp'), 6