polywogsys

Autoindent based on syntax, tabstop to 4 spaces instead of 8 (default), and use spaces instead of the TAB character (TAB is default).

To make permanent, edit ~/.vimrc and put this in it:

set autoindent
set tabstop=4
set expandtab

Then ":retab" to reformat a file with the new settings. http://www.vim.org/tips/tip.php?tip_id=12