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One way to go with it is to use the vim syntax highlighting mechanisms to do that. The first thing to do is to add set filetype=cowfortune to your function:
function Cow()
enew
set filetype=cowfortune
setlocal bufhidden=wipe
for line in split(system('ls -l'), '\n')
call append('$', ' ' . l:line)
endfor
setlocal ...
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