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tldr; How do pass stdout of BufWritePost to an external command?

On command line I can run

cat index.html | tidy -indent -modify

I'm trying to call tidy automatically when I :w

This is what I have so far:

:function! Tidy()
:  call tidy -indent -modify --doctype omit --show-body-only yes 
:endfunction

autocmd BufWritePost *.html call Tidy()

I'm missing some vimscript skills

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  • Probably you just need to use a filter (:help filter should get you there; something like :%!tidy …). Otherwise there are system/sytemlist. You might want BufWritePre if you change the contents. – D. Ben Knoble Apr 28 at 21:26
  • Thanks, what is the meaning of % in this context? Yes BufWritePre makes more sense – user885983 Apr 28 at 21:39
  • Try :help [range]; it means filter (!) the whole buffer (%) – D. Ben Knoble Apr 28 at 21:52
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Assuming the intent is to replace the contents with the tidy’d contents before writing, I would use BufWritePre and a filter like

:%!tidy …

This gives the buffer as standard in and replaces it with standard out.

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