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Sarrenthal: This is a bit more complicated than it may seem. More complicated than I want to deal, honestly.
If you are commonly split epubs from the same source, it probably seems obvious what the 'right' choices are, but I have to consider all possibilities plus the edge and corner cases they can each have.
Here are just a few of the complexities:
- Some epubs have many parts (different files internally), but few TOC entries.
- Some epubs have may TOC entries, but few part/files.
Should the automatic split points be by TOC entry or by part/file counts?
- In some epubs the TOC entries point to beginning of each part/file.
- In some the TOC entries point to HTML tags somewhere.
Some epubs include content in the same part/file before the TOC tag, if split from the TOC tag, that prior content will be in the previous split.
- TOC entries and part/files are never guaranteed to be evenly sized.
Splitting every 10 or 100 entries may have wildly different sized splits.
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