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dotvim / bundle / vim-coffee-script / ftdetect / coffee.vim

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" Language:    CoffeeScript
" Maintainer:  Mick Koch <kchmck@gmail.com>
" URL:         http://github.com/kchmck/vim-coffee-script
" License:     WTFPL

autocmd BufNewFile,BufRead *.coffee set filetype=coffee
autocmd BufNewFile,BufRead *Cakefile set filetype=coffee
autocmd BufNewFile,BufRead *.coffeekup,*.ck set filetype=coffee
autocmd BufNewFile,BufRead *.ck set filetype=coffee

function! s:DetectCoffee()
    if getline(1) =~ '^#!.*\<coffee\>'
        set filetype=coffee
    endif
endfunction

autocmd BufNewFile,BufRead * call s:DetectCoffee()