dif: add non-stdin mode
dif: add non-stdin mode

nestukh/dotfiles,benizi/dotfiles,benizi/dotfiles,nestukh/dotfiles,nestukh/dotfiles,nestukh/dotfiles,benizi/dotfiles,benizi/dotfiles,nestukh/dotfiles,benizi/dotfiles,benizi/dotfiles,nestukh/dotfiles,benizi/dotfiles,benizi/dotfiles,nestukh/dotfiles,nestukh/dotfiles