I’ve released a tool for “inverse literate programming”. It takes a normal Elixir project and creates a website in which each page corresponds to an elixir source file and where the comments are rendered as HTML and the code is rendered with syntax highlighting. More importantly, in the code, when you click a function you are taken to it’s definition (in the current project , to the hexdocs for functions imported from Hex packages and to the Erlang docs for functions from the Erlang standard library).

Demo here: https://tmbb.github.io/guaxinim/guaxinim.ex.html. It’s Guaxinim’s own source processed with Guaxinim, probably overly-annotated; it needs refactoring badly.
Example of all kinds of hyperlinks that are supported: https://tmbb.github.io/guaxinim/guaxinim_test.ex.html

It’s very easy to use. Just add to the dependencies of your project and run mix guaxinim.render.
You might find it useful to document complex algorithms or programs with non-obvious control-flow.
Also, the hyperlinks make it very easy for programmers to explore the source.

Detailed instructions can be found in the README: GitHub - tmbb/guaxinim: Literate programming for Elixir, inspired by Docco and Pycooon · GitHub

This is probably still a little buggy (although I can’t find any bugs now). It won’t probably eat your source.
It depends on some Mix.Xref features that aren’t part of the Public API, so unless those features are stabilized, this might break in future Elixir versions. It depends on Elixir 1.5.

The goals here are quite similar to those of the Source Graph project, but read-only. The interesting part is that for many languages (like python, for example, Ruby is probably the same) Source Graph is a huge undertaking requiring a decent research effort, and Elixir has almost everything it needs either in the compiler or in the BEAM debug chunks xD

Future Developments

• Refactor the code so that it can be used independently of the Mix task
• The CSS style for the text needs some work (I’m happy with the CSS style of the code)
• It needs a “Night Mode”, like ExDoc
• Add some functionality to include Markdown files for more in-depth explanation of design features.
• Better navigation
• Add breadcrumbs (also part of “Better navigation”)
• Contribute PRs to upstream projects: Amnesia (a mnesia wrapper, appears to have some problems with missing module requires) and Makeup (sigils without interpolation currently highlight as if they supported interpolation).