Have you asked the calibre plugin author if they would like to modify their plugin to run with Sigil? If not, I am sure someone here could throw one together using the calibre one as a base since only the gui would be different, where-as both support html5lib, lxml, etc and of course python and parsing of xhtml is easily achieved in both. So unless it uses some special interfaces specific to calibre, most if it should be re-usable. What license does the calibre plugin use?
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