Vim run autocmd on all filetypes EXCEPT

by

*.rb isn’t a filetype. It’s a file pattern. ruby is the filetype and could even be set on files that don’t have a .rb extension. So, what you most likely want is a function that your autocmd calls to both check for filetypes which shouldn’t be acted on and strips the whitespace.

fun! StripTrailingWhitespace()
    " Don't strip on these filetypes
    if &ft =~ 'ruby\|javascript\|perl'
        return
    endif
    %s/\s\+$//e
endfun

autocmd BufWritePre * call StripTrailingWhitespace()

Building on evan’s answer, you could check for a buffer-local variable and determine whether to do the strip using that. This would also allow you to do one-off disabling if you decided that you don’t want to strip a buffer that’s a filetype you normally would strip.

fun! StripTrailingWhitespace()
    " Only strip if the b:noStripeWhitespace variable isn't set
    if exists('b:noStripWhitespace')
        return
    endif
    %s/\s\+$//e
endfun

autocmd BufWritePre * call StripTrailingWhitespace()
autocmd FileType ruby,javascript,perl let b:noStripWhitespace=1

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