Unclear example for using Footnote and links

[sheldonhull]

As a new user of the project, I'm a bit confused on the examples provided, as they show some functions that I can't track down.

I replaced readAll with ioutil.ReadAll which I'm working through now, but the getPrefix doesn't show up in any of the code examples, in this repo. I checked elsewhere and see it mentioned in some unrelated utility libraries, but not sure where this came from.

My goal at this time is to print a list of links, as I'd like to generate a footer at the bottom of my markdown file that uses the markdown reference link style. I figured I could use goldmark to parse the markdown to provide me with all extracted links and then convert these to a new collection of links using the new syntax.

Sound like a reasonable usage of goldmark?

for _, path := range files {
    source := readAll(path) <--- no details provided
    prefix := getPrefix(path) <--- no details provided

    markdown := goldmark.New(
        goldmark.WithExtensions(
            NewFootnote(
                WithFootnoteIDPrefix([]byte(path)),
            ),
        ),
    )
    var b bytes.Buffer
    err := markdown.Convert(source, &b)
    if err != nil {
        t.Error(err.Error())
    }
}