Function librarian::download_or_find_file

pub fn download_or_find_file(
    url: &str, 
    out_dir: Option<&Path>
) -> Result<PathBuf, DownloadError>

Download file if it doesn't already exist, and return the file's location.

You can use out_dir to specify the download directory, otherwise the build script output directory will be used.

Example:

librarian::download_or_find_file("https://example.com/file.zip", None)?;