[DrChiper]

Originally Posted by capink

Template language has a function called has_extra_files(). You can leverage this doing the following template search (copy paste into calibre search bar):

template:"""program: 
	if has_extra_files() then 'yes' else 'no' fi#@#:t:yes"""

A little slow because it uses templates, but it gets the job done. If you are going to use it often, it is a good idea to make this a saved search.

Yes, that works nicely. Thanks.

Originally Posted by BetterRed

I use an icon

Attachment 205884

program:
	if has_extra_files()
		then 'folder.png'
	fi

BR

I like this as it integrates in my preferred view. Nice icon too. No copyrights I hope?

PS: It would be nice to be able to add actions to the icon, so a click on the icon could open the data folder. A well, perhaps in a future version ...
PSPS: And it works on "Cover Grid --> Emblems" too ...