if (!isdirectory(expand("$HOME/.config/nvim/repos/github.com/Shougo/dein.vim")))
call system(expand("mkdir -p $HOME/.config/nvim/repos/github.com"))
call system(expand("git clone https://github.com/Shougo/dein.vim $HOME/.config/nvim/repos/github.com/Shougo/dein.vim"))
endif
call dein#add('Shougo/dein.vim')
dein#check_install()
could accept argv to enable silent mode.