[plugin_dev]

I'm trying to write a plugin which will zero the ratings on any books which are imported.

I thought this would be a simple job, but sadly it is proving a little more fiddly than I'd expect. Looking at the documentation I see that I need a FileTypePlugin, and there is the ability to call a method post-import, which sounds like it should do the right thing.

My code looks like this:

import os
from calibre.customize import FileTypePlugin
from calibre.ebooks.metadata.meta import get_metadata, set_metadata

class ZeroRatingsPlugin(FileTypePlugin):

    name                = 'Reset Rating Plugin'
    description         = 'When a book is imported set the rating to zero.'
    supported_platforms = ['windows', 'osx', 'linux']
    author              = 'Mysql.'
    version             = (1, 0, 1)
    file_types          = set(['epub', 'mobi', 'lit', 'prc'])
    on_import           = True
    on_postimport       = True
    minimum_calibre_version = (2,0,0)

    def run(self, path_to_ebook):
        '''
        NOP
        '''
        print "ZeroRatings::run(%s)" % path_to_ebook
        return path_to_ebook

    def postimport( book_id, book_format, db):
        '''
        Find the path to the book, and zero the rating.
        '''
        print "ZeroRatings::postimport()"

        if db is None:
            from calibre.library import db
            db = db() # initialize calibre library database

        path_to_ebook = db.format_abspath(book_id, book_format, index_is_id=True)
        print( "Path to book is %s" % path_to_ebook )

        file = open(path_to_ebook, 'r+b')
        print "Book is at " , path_to_ebook
        ext  = os.path.splitext(path_to_ebook)[-1][1:].lower()
        mi = get_metadata(file, ext)
        print "Current rating is:", mi.rating
        mi.rating = 0
        set_metadata(file, mi, ext)

(Obviously the last part of the code is work in progress, and I've been able to test it due to the problem I'm having)

When I import a book I see this

	ZeroRatings::run(/home/skx/test/foo.epub)

(I'm testing via "calibre-debug -s; calibre-customize -b $(pwd); calibre-debug -g", from my plugin-directory.)

That suggests that my Plugins run method is called but NOT the postimport method.

I get the feeling I'm missing something obvious, but I'm not sure what that might be.