Parsing external links as local

[bedax]

I'm trying to turn the rust webassembly book into an epub. I added the necessary line to book.toml, ran mdbook build and got the following:

2019-08-13 12:53:33 [INFO] (mdbook::book): Book building has started
2019-08-13 12:53:33 [INFO] (mdbook::book): Running the epub backend
2019-08-13 12:53:33 [INFO] (mdbook::renderer): Invoking the "epub" renderer
Error: Inspecting the book for additional assets failed
        Caused By: Unable to fetch the canonical path for /home/tom/downloads/wasmbook/src/game-of-life/https://upload.wikimedia.org/wikipedia/commons/e/e5/Gospers_glider_gun.gif
        Caused By: No such file or directory (os error 2)
2019-08-13 12:53:33 [ERROR] (mdbook::renderer): Renderer exited with non-zero return code.
2019-08-13 12:53:33 [ERROR] (mdbook::utils): Error: Rendering failed
2019-08-13 12:53:33 [ERROR] (mdbook::utils):    Caused By: The "epub" renderer failed

It looks like it considers that external link to be a local file

[bedax]

By the way, if you point me in the right direction, I'll be happy to give this one a go

[Michael-F-Bryan]

I have a feeling this line is to blame.

    // TODO: Allow linked images to be either a URL or path on disk

    // I'm assuming you'd just determine if each link is a URL or filename so
    // the `find()` function can put together a deduplicated list of URLs and
    // try to download all of them (in parallel?) to a temporary location. It'd
    // be nice if we could have some sort of caching mechanism by using the
    // destination directory (hash the URL and store it as
    // `book/epub/cache/$hash.$ext`?).

[bedax]

Alright thanks, well I'll give it a go when I get a chance 👍

[blandger]

Rust Webassembly book was built using 0.4.31, works fine.
Your can take it from here
https://github.com/blandger/epub-rust-books/tree/main/Rust%20and%20WebAssembly