For redefine tabs to space (whatever many spaces, the development default is four) is very simple.
Open the ~/.vimrc:
So, paste the configuration into the file:
set tabstop=4 " The width of a TAB is set to 4. " Still it is a \t. It is just that " Vim will interpret it to be having " a width of 4. set shiftwidth=4 " Indents will have a width of 4 set softtabstop=4 " Sets the number of columns for a TAB set expandtab " Expand TABs to spaces
Save and restart (:wq!) vim.