Quote:
Originally Posted by JimmXinu
Question for Plugin Users
There are several options available on every download/update: - Output Format
- Update Mode
- Update Calibre Metadata
- Update EPUB Cover
- Background Metadata (updates only)
[...]
Which are these settings are actually useful today on every download/update?
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Output Format:
Never touch it.
Update Mode:
Frequently use most of the modes.
Update Calibre Metadata:
Currently on; never touch it.
Background Metadata (updates only):
Currently off; never touch it.
Update EPUB Cover:
The setting that, historically, has confused me the most and the number one reason I decided to respond as soon as I saw the question. 
For a long while I was unclear on what "Update EPUB Cover" even did. I tried it both off and on and didn't see any difference in behavior that affected me so I ultimately ended up leaving it alone. (Nowaday's I do understand what it does and leave it on. I can't think of any reason why I'd ever want it off for a particular download.)
I customize the covers of nearly every book I download, so what I really
hoped it might do when I first started experimenting with it was toggle between two behaviors:
- Replace the current Calibre cover with one downloaded or generated based on whatever is configured under the "Calibre Cover" settings tab.
- Leave the cover currently contained in the Calibre metadata completely untouched.
Obviously, I quickly learned my hopes were unfounded.
Right now, any time I'm going to update a bunch of existing books that have customized covers, I go into settings and flip "Update Calibre Cover (from EPUB)" to "No", then remember to set it back to " Yes, if EPUB..." when I'm done. It's a minor inconvenience, but an inconvenience nonetheless.
As long as you're working in cleaning up that bit of the code, I don't suppose there's any possibility of a per-download option that would quickly guarantee leaving the Calibre cover alone (
wink-wink-nudge-nudge)?