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Old 08-27-2009, 03:55 PM   #2
kovidgoyal
creator of calibre
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You wont be able to create a plugin to automatically fetch the metadata. But you can just create a new metadata reader plugin for your files that extracts the ISBN. That way you can just click a button and calibre will download all metadata based on the extracted plugin.

As for your question: Look in the calibre sources (in the builtins module) to see how metadata reader plugins are created. Create yours in exactly the same way and add it to calibre with a high priority so it overrides the built-in one.
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