Here is a small script that will detect some guideline violations for vim. I put it in my .vimrc and it highlight all the errors it can find in all opened files. I'd like to know if you made improvements on it.

" autocmd that will set up the w:created variable (vim tip 1598)
" so we can run the check only once per window
autocmd VimEnter * autocmd WinEnter * let w:created=1

:fu FuncHaikuCheck()
	call matchadd('Search', '\%>80v.\+', -1) " line with more than 80 chars
	call matchadd('Search', '  ', -1)        " probably wrong indenting
	call matchadd('Search', '\(for\|if\|select\|while\)(', -1) "keyword without space after it
	call matchadd('Search', '[a-zA-Z0-9][,=<>/+\-*;][a-zA-Z0-9]', -1) "operator without space around it
	call matchadd('Search', '[^*/][,=/+\-* ]$', -1) "operator at end of line (without false positives on /* and */)
:endfu

" call the function on all opened files
autocmd WinEnter * if !exists('w:created') | call FuncHaikuCheck() | endif
autocmd BufWinEnter * call FuncHaikuCheck()