Quote:
Originally Posted by compurandom
What would I need to do (to write a plugin) to extract metadata not currently supported into custom columns for book formats that are already supported by calibre?
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The metadata source plugins can only update certain columns. That means you have to write all the metadata update and page fetching code yourself. There are some sample that you can look at. The Goodreads frating plugin fetches the rating from Goodreads. The Goodreads Sync also fetches some information, but that uses the API for some of the function.