A major mode for editing Ren'Py files.

Features: indentation, syntax highlighting for Ren'py and embedded Python,
movement commands, context-sensitive symbol completion, jumping to
definitions with Xref, running renpy CLI subcommands, error highlighting with
Flymake, in-buffer navigation with Imenu, Outline Minor Mode for an overview
of block-defining statements.

The codebase is based on Leo Liu's fork of the original Emacs's python.el by
Dave Love.