How can I programmatically modify permalinks?

[skagedal]

I asked this question on Stack Overflow but thought it would be good to ask as well, sorry if some of you already read this.

I want to tweak the permalink of each page programatically, using permalink templates is not enough. I tried using a Generator plugin, something like:

module MySite
  class MySiteGenerator < Jekyll::Generator
    def generate(site)
      site.pages.each do |page|
        page.data['permalink'] = '/foo' + page.url
        # real world manipulation of course more complicated
      end
    end
  end
end

But although this would run and set the page.data['permalink'] field, the output was still the same.

On Stack Overflow I got the suggestion to instead override the Page class, like:

module Jekyll
  class Page
    alias orig_permalink permalink
    def permalink
      permalink    = orig_permalink
      newPermalink = "foo/#{permalink}"
    end
  end
end

But this didn't work either, only if a page had a manually configured permalink in the front matter did it work, otherwise the pages were not generated in _site at all. Here's a test repo.

Is there a way to get what I want? Thanks!

[parkr]

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