Did you read the documentation? Link-checker is a small script designed to check links already.
That page shows examples of it running from the command-line, not from inside IRB or Ruby code. In other words, it is a command-line app, not code you require
:
Usage:
Just give it the target that you want it to scan. For example, if you have an Octopress site then your output HTML is in the public directory, so call it with:
check-links 'public'
Or if you want to check the links on a live site, then give it a URL instead:
check-links 'http://www.ryanalynporter.com'
If you don’t pass any target, then the default is to scan the “./” directory. If you have a Jekyll site that you deploy to GitHub Pages, then you can check the links with just:
check-links