Only configure neocomplcache if it exists

vimrc

@@ -227,57 +227,59 @@ let g:airline_powerline_fonts = 1
 let g:signify_update_on_bufenter = 1
 let g:signify_update_on_focusgained = 1
 
-" Autocomplete settings
-" 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\*'
-
-" Define keyword.
-if !exists('g:neocomplcache_keyword_patterns')
-    let g:neocomplcache_keyword_patterns = {}
-endif
-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()
-
-" <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>"
-endfunction
-" <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><TAB> pumvisible() ? neocomplcache#close_popup() : "\<TAB>"
-let g:neocomplcache_enable_auto_select = 0
-
-" 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 = {}
+if exists("neocomplcache")
+	" Autocomplete settings
+	" 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\*'
+
+	" Define keyword.
+	if !exists('g:neocomplcache_keyword_patterns')
+		let g:neocomplcache_keyword_patterns = {}
+	endif
+	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()
+
+	" <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>"
+	endfunction
+	" <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><TAB> pumvisible() ? neocomplcache#close_popup() : "\<TAB>"
+	let g:neocomplcache_enable_auto_select = 0
+
+	" 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 = {}
+	endif
+	let g:neocomplcache_omni_patterns.php = '[^. \t]->\h\w*\|\h\w*::'
+	let g:neocomplcache_omni_patterns.c = '[^.[:digit:] *\t]\%(\.\|->\)'
+	let g:neocomplcache_omni_patterns.ruby = '[^. *\t]\.\w*\|\h\w*::'
 endif
-let g:neocomplcache_omni_patterns.php = '[^. \t]->\h\w*\|\h\w*::'
-let g:neocomplcache_omni_patterns.c = '[^.[:digit:] *\t]\%(\.\|->\)'
-let g:neocomplcache_omni_patterns.ruby = '[^. *\t]\.\w*\|\h\w*::'
 
 " Leader commands