" Highlight Class and Function names
syn match    cCustomParen    "(" contains=cParen
syn match    cCustomFunc     "\w\+\s*(" contains=cCustomParen

hi def link cCustomFunc  Function
hi def cCustomFunc  gui=bold guifg=yellowgreen

highlight ExtraWhitespace ctermbg=red guibg=red
match ExtraWhitespace /\s\+$/
autocmd BufWinEnter * match ExtraWhitespace /\s\+$/
autocmd InsertEnter * match ExtraWhitespace /\s\+\%#\@<!$/
autocmd InsertLeave * match ExtraWhitespace /\s\+$/
autocmd BufWinLeave * call clearmatches()