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From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: Macro that calls external program
Date: Mon, 11 Mar 2019 12:03:50 -0700
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Josh <jnfo-d@grauman.com> writes:

> Thanks! This is very helpful.
>
> I have a related question. How can I run an external program right
> before Export that takes as input the current buffer and prints out to
> stdout an updated version of the org file that then is exported?
> Basically I want to pipe the org file through a filter that is an
> external program before it is exported.

Probably one of `org-export-before-parsing-hook' or
`org-export-before-processing-hook' is where you'd hang a custom
function that does this.