Ultimate auto completion system for Vim
Vim script
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neocomplcache is the abbreviation of "neo-completion with cache". It provides keyword completion system by maintaining a cache of keywords in the current buffer. neocomplcache could be customized easily and has a lot more features than the Vim's standard completion feature.


  • Extract the file and put files in your Vim directory (usually ~/.vim/ or Program Files/Vim/vimfiles on Windows).
  • Execute |:NeoComplCacheEnable| command or let g:neocomplcache_enable_at_startup = 1 in your .vimrc. Not in .gvimrc(_gvimrc)!


Because all variable names were changed in neocomplcache Ver.5, it is not backwards compatible. If you want to upgrade, you should use the following script from Mr.thinca.


Snippets feature(snippets_complete source) was split from Ver.7. If you used it, please install neosnippet source manually.


Screen shots

Original filename completion.

Original filename completion.

Omni completion.

Omni completion.

Completion with vimshell(http://github.com/Shougo/vimshell).

Completion with vimshell(http://github.com/Shougo/vimshell).

Vim completion

Vim completion.

Setting examples

"Note: This option must set it in .vimrc(_vimrc).  NOT IN .gvimrc(_gvimrc)!
" Disable AutoComplPop.
let g:acp_enableAtStartup = 0
" Use neocomplcache.
let g:neocomplcache_enable_at_startup = 1
" Use smartcase.
let g:neocomplcache_enable_smart_case = 1
" Set minimum syntax keyword length.
let g:neocomplcache_min_syntax_length = 3
let g:neocomplcache_lock_buffer_name_pattern = '\*ku\*'

" Enable heavy features.
" Use camel case completion.
"let g:neocomplcache_enable_camel_case_completion = 1
" Use underbar completion.
"let g:neocomplcache_enable_underbar_completion = 1

" Define dictionary.
let g:neocomplcache_dictionary_filetype_lists = {
    \ 'default' : '',
    \ 'vimshell' : $HOME.'/.vimshell_hist',
    \ 'scheme' : $HOME.'/.gosh_completions'
        \ }

" Define keyword.
if !exists('g:neocomplcache_keyword_patterns')
    let g:neocomplcache_keyword_patterns = {}
let g:neocomplcache_keyword_patterns['default'] = '\h\w*'

" Plugin key-mappings.
inoremap <expr><C-g>     neocomplcache#undo_completion()
inoremap <expr><C-l>     neocomplcache#complete_common_string()

" Recommended key-mappings.
" <CR>: close popup and save indent.
inoremap <silent> <CR> <C-r>=<SID>my_cr_function()<CR>
function! s:my_cr_function()
  return neocomplcache#smart_close_popup() . "\<CR>"
  " For no inserting <CR> key.
  "return pumvisible() ? neocomplcache#close_popup() : "\<CR>"
" <TAB>: completion.
inoremap <expr><TAB>  pumvisible() ? "\<C-n>" : "\<TAB>"
" <C-h>, <BS>: close popup and delete backword char.
inoremap <expr><C-h> neocomplcache#smart_close_popup()."\<C-h>"
inoremap <expr><BS> neocomplcache#smart_close_popup()."\<C-h>"
inoremap <expr><C-y>  neocomplcache#close_popup()
inoremap <expr><C-e>  neocomplcache#cancel_popup()
" Close popup by <Space>.
"inoremap <expr><Space> pumvisible() ? neocomplcache#close_popup() : "\<Space>"

" For cursor moving in insert mode(Not recommended)
"inoremap <expr><Left>  neocomplcache#close_popup() . "\<Left>"
"inoremap <expr><Right> neocomplcache#close_popup() . "\<Right>"
"inoremap <expr><Up>    neocomplcache#close_popup() . "\<Up>"
"inoremap <expr><Down>  neocomplcache#close_popup() . "\<Down>"
" Or set this.
"let g:neocomplcache_enable_cursor_hold_i = 1
" Or set this.
"let g:neocomplcache_enable_insert_char_pre = 1

" AutoComplPop like behavior.
"let g:neocomplcache_enable_auto_select = 1

" Shell like behavior(not recommended).
"set completeopt+=longest
"let g:neocomplcache_enable_auto_select = 1
"let g:neocomplcache_disable_auto_complete = 1
"inoremap <expr><TAB>  pumvisible() ? "\<Down>" : "\<C-x>\<C-u>"

" Enable omni completion.
autocmd FileType css setlocal omnifunc=csscomplete#CompleteCSS
autocmd FileType html,markdown setlocal omnifunc=htmlcomplete#CompleteTags
autocmd FileType javascript setlocal omnifunc=javascriptcomplete#CompleteJS
autocmd FileType python setlocal omnifunc=pythoncomplete#Complete
autocmd FileType xml setlocal omnifunc=xmlcomplete#CompleteTags

" Enable heavy omni completion.
if !exists('g:neocomplcache_omni_patterns')
  let g:neocomplcache_omni_patterns = {}
let g:neocomplcache_omni_patterns.php = '[^. \t]->\h\w*\|\h\w*::'
let g:neocomplcache_omni_patterns.c = '[^.[:digit:] *\t]\%(\.\|->\)'
let g:neocomplcache_omni_patterns.cpp = '[^.[:digit:] *\t]\%(\.\|->\)\|\h\w*::'

" For perlomni.vim setting.
" https://github.com/c9s/perlomni.vim
let g:neocomplcache_omni_patterns.perl = '\h\w*->\h\w*\|\h\w*::'