Add highlight for spaces.

highlight_spaces.vim

" Vim plugin file - highlight_spaces
"
" Last Change:   08 February 2010
" Maintainer:    Milly
" Purpose:       Add highlight for spaces.
"=============================================================================
if exists("loaded_highlight_spaces")
  finish
endif

if has('syntax') && has('iconv')

  function! s:HighlightSpaces()
    if &buftype == ""
      syntax match FullWidthSpace "　" display containedin=ALL
      highlight FullWidthSpace ctermbg=darkgrey guibg=#555555
      syntax match TrailedSpaces "\s\+$" display containedin=ALL
      highlight TrailedSpaces ctermbg=grey guibg=#666666
    endif
  endf

  augroup highlight_spaces
    au!
    au BufNew,BufRead,FileType,ColorScheme * call s:HighlightSpaces()
  augroup END

endif

let loaded_highlight_spaces=1