Adding media files to ePub referenced only from stylesheet

[nkalvi]

In ePub writer, would you consider adding an option to add media files that are referenced only the style sheet, but not in the source documents?

https://groups.google.com/forum/#!topic/pandoc-discuss/BRqy-SEjBiQ

[jgm]

I think this ought to be the default, actually, not something you
have to set an option for.

Note: (undocument feature) I think you can actually specify any
media file to be included in the epub using --epub-embed-font.
None of the code processing that is actually font-specific.
(I haven't tried it, though.)

[nkalvi]

Aha - adding via 'embed-font' worked very well - thank you!

[jgm]

Maybe this should remain open, since ideally the epub writer would scan
the CSS for linked files and include them automatically...

+++ nkalvi [Feb 14 15 16:24 ]:

Closed #1941.

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Reply to this email directly or view it on GitHub:
#1941 (comment)

[nkalvi]

I agree.

[mpickering]

@jgm How are you envisaging supporting this? Do we currently depend on a library which can parse CSS or should we roll our own?

[jgm]

@jgm How are you envisaging supporting this? Do we currently depend on a library which can parse CSS or should we roll our own?

@mpickering, I hadn't thought about it much. SelfContained currently
has something that does limited looking through CSS files for external
references; maybe that could be adapted? We don't depend on a CSS
parsing library.

Another option is to make either --epub-embed-resource or --epub-embed-image.

The former could allow including any type of file (video, image, font, stylesheet).

The latter would be an alias for --epub-embed-font.

Meanwhile, for anyone looking for a quick fix to automate this:

#!/bin/bash

FILENAME=filename.epub
CSS=style.css
IMAGES_DIR=images

for url in $(grep image $CSS | grep url | sed 's/.*url( *\(.*\) *).*/\1/g'); do
  EMBED="$EMBED --epub-embed-font=$IMAGES_DIR/$url"
done

pandoc \
  --smart \
  --epub-cover-image=cover/cover.png \
  --epub-metadata=metadata.xml \
  --epub-stylesheet=$CSS \
  --epub-embed-font=fonts/EmbeddedFont.ttf \
  $EMBED \
  -t epub -o $FILENAME output/*.md