use lua for may_create_dir

autoload/utils.vim

@@ -207,12 +207,3 @@ function! utils#add_pack(name) abort
 
   return l:status
 endfunction
-
-" Create the parent dir for current file if it does not exist
-function! utils#may_create_dir(path) abort
-  let l:parent_dir = fnamemodify(a:path, ':p:h')
-
-  if !isdirectory(l:parent_dir)
-    call mkdir(l:parent_dir, "p")
-  endif
-endfunction

core/autocommands.vim

@@ -121,5 +121,5 @@ augroup END
 
 augroup auto_create_dir
   autocmd!
-  autocmd BufWritePre * call utils#may_create_dir(expand("<afile>"))
+  autocmd BufWritePre * lua require('utils').may_create_dir()
 augroup END

lua/utils.lua

@@ -14,4 +14,14 @@ function M.executable(name)
   return false
 end
 
+function M.may_create_dir()
+  local fpath = vim.fn.expand('<afile>')
+  local parent_dir = vim.fn.fnamemodify(fpath, ":p:h")
+  local res = vim.fn.isdirectory(parent_dir)
+
+  if res == 0 then
+    vim.fn.mkdir(parent_dir, 'p')
+  end
+end
+
 return M