How to switch off all kinds of auto-indentation in VIM. Put this into ~/.vimrc (or _vimrc in your VIM directory if you are on windows); create the file if it doesn’t exist:
" Switch off all auto-indenting set nocindent set nosmartindent set noautoindent set indentexpr= filetype indent off filetype plugin indent off
The first line is a comment; the rest switches off all the different parts of the auto-indentation system.