I don't know if I understand exactly whar you want to do, but it seems to me, that standard calibre can do what you want.
If you mean with text files, that you convert the books to txt, calibre can do that. You then could just use save to disk. You can save the cover and the metadata file too.
If you mean just the infos about books, that is in calibre. Maybe it is possible to just export these, otherwise copy the library and then delete all formats from the new library.
If you just want to catalog your books, calibre has that feature as well.
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