This is not entirely obvious (at least it wasn’t for me), but since Github wikis are actually backed by a proper Git repo, I figured it should be possible to access the raw markdown for a page by using Github’s https://raw.github.com/ style URLs.
After some minor trial/error, it turns out to be very predictable (as many things in github):
https://raw.github.com/wiki/[user]/[project]/[page].md
Just replace the square brackets’ stuff with your values and that’s it. I think I’ll be trying this out with a wiki page as a Release Notes landing page, which I just pull in raw format on a build script and replace the Nuget <releaseNotes> node with its content…
Another tip for private repos:
https://raw.github.com/wiki/user/repo/page.md?login=login&token=token
You can get your token by appending “.md” to any wiki page; it will redirect you to the raw URL.