Is there any way to specify the com.apple.ibooks.display-options value defined on EPUB.hs when exporting?

[nonoesp]

I have the need to create an .epub file setting the com.apple.ibooks.display-options as false instead of true — which seems to be the default option using the EPUB.hs Writer.

The file currently looks like this inside of the created epubs:

<?xml version="1.0" encoding="UTF-8"?>
<display_options>
  <platform name="*">
    <option name="specified-fonts">true</option>
  </platform>
</display_options>

And I would like it to look like this (the only that changes is true to false):

<?xml version="1.0" encoding="UTF-8"?>
<display_options>
  <platform name="*">
    <option name="specified-fonts">false</option>
  </platform>
</display_options>

Is there a way to specify this option without having to re-compile pandoc modifying EPUB.hs?

[jgm]

No. I'm open to simply changing the default to false, unless there is some reason why it would be better for some people to make it true. I can't see one at the moment.

[nonoesp]

That would be awesome. Its a bit tedious to change it each time the book is re-generated.

I believe true enforces iBooks to show the customized stylesheet of the book, but it is usually not the desired behaviour.

[jgm]

See #2693

[mb21]

This is still hard-coded to true in https://github.com/jgm/pandoc/blob/master/src/Text/Pandoc/Writers/EPUB.hs#L862

But apparently, it's need when you want iBooks to load custom fonts.

[jgm]

So from 20103ac it looks like we have a specified-fonts field in ibook metadata.

Question: should this field be used to set the value of specified-fonts also in display-data?
It would be quite easy to change that.