Maybe you could consider documenting each step as a commit instead? I know
Basically, each tutorial is a git-repository with a number of commits. Each
commit is a step in the tutorial, so you can walk through it and see what
the code is like in each step.
Here's a ruby script that enables you to walk up and down Git
And for coolness factor: here's how Christian integrated git-walk stepping
in Emacs: http://cjohansen.no/en/emacs/live_coding_help_from_git_and_emacs
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