Automatically stripping/highlighting trailing whitespace in VIM

gistfile1.vim

" Two best solutions from the discussion here http://stackoverflow.com/questions/356126/how-can-you-automatically-remove-trailing-whitespace-in-vim

" Automatically strip white space on save in VIM.

fun! <SID>StripTrailingWhitespaces()
	let l = line(".")
	let c = col(".")
	%s/\s\+$//e
	call cursor(l, c)
endfun

autocmd BufWritePre *.* :call <SID>StripTrailingWhitespaces()

" Also highlight trailing whitespace in a red color when you're not in INSERT mode

highlight ExtraWhitespace ctermbg=red guibg=red
au ColorScheme * highlight ExtraWhitespace guibg=red
au BufEnter * match ExtraWhitespace /\s\+$/
au InsertEnter * match ExtraWhitespace /\s\+\%#\@<!$/
au InsertLeave * match ExtraWhiteSpace /\s\+$/