File-local export filters

[Carsten Dominik <carsten.dominik@gmail.com>]

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Hi everyone

I guess this is mostly a request for Nicolas, but maybe others would
like to chime in.

Quite often I am in a situation where I want to use filters
to customize the export for a specific file.  I was wondering
if it would be useful to support a special source code block
that can contain code that should be executed before export in
a way that a temporary list of export filters is installed
for this specific backend and then removed again.

For example, I would like to have special formatting of
time stamps in a specific file - I could then use this
to install a filter in org-export-filter-timestamp-functions
that would do this special formatting, without influencing
what happens to other exports.

Have I overlooked an easy way to do this, or would this be
something others would like to use as well.

- Carsten

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