@Nonnull
		@Override
		public Path getFile() {
			if (file == null) {
				file = obtainer.apply(getOriginalResource());
				if (file == null) {
					throw new ResourceNotFoundException(getOriginalResource(), "Could not obtain file resource");
				}
			}
			return file;
		}
A <code>ResourceResolver</code> that, when given a resource string which
looks like a path to a file on the local file system, will return a reference
to that file.
src/main/java/dev/jbang/source/resolvers/FileResourceResolver.java