vim: how to press after execution of external cmd

hi experts:
I now everything after
:!ext-prog
will be treated as param of that ext-prog. so I can't
:!ext-prog param1 param2 <enter>
but then how to avoid keep typing <enter> in following cases?

command! AsciidocA call s:Asciidoc2All()

function! s:Asciidoc2All()
w|!asciidoc -a toc -a toclevels=6 -o
/mnt/public_html/temp/%:t:r.html "%"
w|!asciidoc -b odt -o ~/Dropbox/temp-transfer/%:t:r.fodt "%"
w|!asciidoc -b odp -o ~/Dropbox/temp-transfer/%:t:r.fodp "%"
w|!a2x -f pdf --verbose --no-xmllint "%"
endfunction


I tried following doesn't work:

command! AsciidocA call s:Asciidoc2All()

function! s:Asciidoc2All()
w|!asciidoc -a toc -a toclevels=6 -o
/mnt/public_html/temp/%:t:r.html "%"
<enter>
w|!asciidoc -b odt -o ~/Dropbox/temp-transfer/%:t:r.fodt "%"
<enter>
w|!asciidoc -b odp -o ~/Dropbox/temp-transfer/%:t:r.fodp "%"
<enter>
w|!a2x -f pdf --verbose --no-xmllint "%"
endfunction

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