arcpy - Exporting an ArcGIS model to a script, with a script?

I would like to automatically export ArcGIS models to python scripts (and graphics for the model diagram).

In order to apply version control to ArcGIS Models my current workflow is to: a) build and refine the model, b) export to script and graphics, c) commit to source code control. Rinse, lather, repeat.

Step (b) is a brainless pointy clicky exercise with too much friction which c/should be automated. How?