I’ve used both spacemacs (in org-mode with some custom functions) and scrivener to good effect for fiction, but I’m not completely convinced for screenwriting. In a screenplay the layout isn’t design, it’s a very specific format. Final draft actually does the opposite of the complaint about WYSIWYG editors: it handles the formatting automatically and correctly, so you can just write without thinking about it. We may enjoy tinkering with editors, but the eloi just want to get work done.
The other problem is more of a social one, and I guess isn’t actually relevant for most people writing screenplays, but at the professional level you’ll be expected to use final draft, if only because everyone else does.
command, which exports to Final Draft's native format.
However, exporting functions are scheduled to be removed in the next version. When that happens, you can simply create a free account on https://writerduet.com/ to perform the conversion.
The other problem is more of a social one, and I guess isn’t actually relevant for most people writing screenplays, but at the professional level you’ll be expected to use final draft, if only because everyone else does.