epub-show-cover.py gets "IndexError: list index out of range" error

[RickVincent]

Hi Antonios,

I am testing your tool "epub-show-cover.py", but constantly get below error with some of my epub books.
cover_id = t.xpath("//opf:metadata/opf:meta[@name='cover']",
IndexError: list index out of range

could you help to check?

Attached 2 opf files for your reference. (Pls unzip it due to uploading limitation of github.)
content.zip
content2.zip

[Alamot]

Well, some EPUB files do not declare explicitly a cover image. Instead, they use an img tag inside the first xhtmt file.

EPUB v2.0 should declare a cover image like this:

<metadata>
   ...
   <meta name="cover" content="cover-image" />
   ...
</metadata>
<manifest>
   ...
   <item href="cover.jpg" id="cover-image" media-type="image/jpeg" />
   ...
</manifest>

EPUB v3.0 should declare a cover image like this:

<manifest>
   ...
   <item href="cover.jpg" id="cover-image" media-type="image/jpeg" properties="cover-image"/>
   ...
</manifest>

In any case, I added some code that tries to find an image inside the first xhtml file. You can try it.