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Originally Posted by Starson17
One problem with automating this is that a "book" record doesn't separately store metadata about each of the "formats" of that book.
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Yes. I've looked into the formats_sizes() template function to see if I could write a similar one for my needs, but the function doesn't have any metadata available which was parsed from the file, it only calls some os function to get the file size.
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Each format can have a different "source" or be its own original. There's no guarantee that any one format is the source for all others.
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That's ok, I just want to separate the precious originals from the converted ones.
My current strategy is to add a tag "Converted <format>" (<format> is replaced by the format name like "Converted MOBI" or "Converted EPUB") when a new format is created by converting. I also look into the ebook metadata when a file is added and if the contributor tag contains "calibre", I also set the same tag. If I remove a format, the corresponding tag is unassigned if it was set.
With this scheme I can always identify the formats which were created by calibre (either because I triggered a conversion from another format or because the added file was created/converted by calibre). If there is a format without the matching tag I know it's the/a original format not modified by calibre.
What do you think of this solution?
Ciao,
Steffen