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('ErrorMsg', '\%>80v.\+', -1) " More than 80 chars on a line
       call matchadd('ErrorMsg', '  ', -1) " Two spaces (likely wrong indentation)
       call matchadd('ErrorMsg', 'for(', -1) "for without space
       call matchadd('ErrorMsg', 'if(', -1) " if without space
       call matchadd('ErrorMsg', 'select(', -1)
       call matchadd('ErrorMsg', 'while(', -1)
       call matchadd('Search', '[a-z-A-Z0-9][,=/+\-*;][a-zA-Z0-9]', -1) " operator with no space around it
       call matchadd('Search', '[,=/+\-* ]$', -1) " operator or whitespace at end of line

:endfu

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