funkpower 19e5f3ddc3 bibfetch: a book's cover from Open Library, by its ISBN ...

`bibfetch::cover(&agent, isbn, cover_id, size)` asks Open Library's covers
store by the ISBN's thirteen-digit form, then its ten-digit form, then by a
cover id a lookup record named, and returns the image or `Ok(None)`. The
answer is checked before it is trusted: JPEG or PNG by content type and by
magic bytes, between 1 KB and 10 MB, at most three redirects, none of them
off HTTPS. One request at a time per process; a 429 or 503 is waited out
for its Retry-After, up to a minute.

`idnorm::isbn` converts between the two forms, and only for an ISBN whose
check digit agrees. Lookup records carry `cover_id` from the edition record
and the search index. The CLI gains `bibfetch cover <isbn> -o <file>`.

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..

arxiv.rs

idnorm: a prefix is ASCII and the text it is cut from is not

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doi.rs

idnorm: a DOI may have brackets in it, and usually the ones Elsevier put there

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isbn.rs

bibfetch: a book's cover from Open Library, by its ISBN

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issn.rs

idnorm and bibfetch: an identifier read, and a register asked

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lib.rs

bibfetch: a book's cover from Open Library, by its ISBN

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main.rs

idnorm and bibfetch: an identifier read, and a register asked

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