I ~~am sure~~ hope somebody™ already thought of this. Feel free to advertise your project here.
P.S.: Image transcription:
Patrick from SpongeBob SquarePants gesturing to the left with open hands:
Somebody should take document type conversion from Pandoc and version control from Git
Patrick gesturing to the right in a pushing motion:
And build a frontend around it
No Pandoc isn’t an editor by any means. It’s an document conversion tool. Think converting a Markdown file into an docx or html or epub or pptx or pdf (via LaTeX or ConText). That’s what pandoc does.
It's also known as The Only Thing Written in Haskell That People Actually Use.