thing.vim

call plug#begin()
"" ...

if executable('clang')
	Plug 'Valloric/YouCompleteMe', { 'do': './install.sh' }
	let g:completionEngine = 'ycm'
else
	if has('lua') && (version >= 704 || version == 703 && has('patch885'))
		Plug 'Shougo/neocomplete.vim'
		let g:completionEngine = 'neocomplete'
	else
		Plug 'Shougo/neocomplcache.vim'
		let g:completionEngine = 'neocomplcache'
	endif

	if g:completionEngine == 'ycm'
		"" add your YCM settings here
	elseif exists('g:completionEngine')
		let g:{g:completionEngine}#enable_at_startup = 1
		"" {brace syntax} like above lets you maintain the same settings for neocomplete and neocomplcache
	endif

"" ...
call plug#end()