isbn
Version 2.0
This library provides methods to manipulate isbns. As of version 2.0 there has been a near complete rewrite of this library but this time there are tests. A few methods have been removed. Here is what remains:
- ISBN.ten will return a 10 digit isbn if you give it a 10 or 13 digit isbn
- it will raise a No10DigitISBNAvailable error if given an isbn starting with 979 because 979 isbns do NOT have a 10 digit counterpart.
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ISBN.thirteen will return a 13 digit isbn if you give it 10 or thirteen digit isbn
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ISBN.as_new will convert an isbn into the used book version for that isbn
- for isbns starting with 978 it returns an isbn starting with 290
- for isbns starting with 979 it returns an isbn starting with 291
- ISBN.as_used will convert an isbn into the new book version for that isbn
- for isbns starting with 290 it returns an isbn starting with 978
- for isbns starting with 291 it returns an isbn starting with 979
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ISBN.valid? will compare the check digit of the passed in isbn with that of one it computes
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ISBN.from_image accept a jpeg of an isbn and OCR it into an isbn.
- it depends on the LibJpeg and Gocr libraries. I recommend Homebrew.
- ISBN.from_string fetches isbn from string