Ignore directory (#8)

* Ignore cspell when buffer is directory.

* Increment the version

* update project words

* Revert changes to pass tests

---------

Co-authored-by: ryicoh <ryicoh@gmail.com>

.cspell/project-words.txt

@@ -24,6 +24,8 @@ matchadd
 matchstr
 norl
 enddef
+isdirectory
+filereadable
 
 # Name of variable
 funcs

README.md

@@ -12,6 +12,11 @@ For [vim-plug](https://github.com/junegunn/vim-plug)
 
 ```vim
 
-Plug 'ryuichiroh/vim-cspell', {'tag': 'v0.4'}
+Plug 'ryuichiroh/vim-cspell', {'tag': 'v0.5'}
 
 ```
+
+# Acknowledgements
+
+* [async.vim](https://github.com/prabirshrestha/async.vim) is embedded with vim-cspell for manage Vim/Neovim jobs. Thanks!
+

autoload/cspell.vim

@@ -20,9 +20,15 @@ let s:latest_lint_job = 0
 let s:use_vim9script = has('vim9script') && !exists('g:cspell_disable_vim9script')
 
 function! cspell#lint() abort
+  let file = expand('%')
+  if isdirectory(file) || !filereadable(file)
+    return
+  endif
+
   let cmd = s:get_command() . ' 2>&1'
 
   let s:bad_words_by_buf[bufnr()] = []
+
   let s:latest_lint_job = s:job_start(cmd, function('s:lint_callback'))
 endfunction