🚀 go-pugleaf

I have an interactive program that I'd like to use under emacs.  The
program takes input; it it prompts for input with a > on a line by
itself.  The program outputs sentences and paragraphs of text.  It's
currently doing its own line wrapping but I'd prefer that emacs do the
formatting of these sentences and paragraphs.  So I think what I want
is sort of a shell mode that takes all lines that aren't a single >
and reformats them.  Does anybody know if there's such an emacs mode?

Footnote: the people in the rec.games.int-fiction will recognize this
program as the Unix Infocom interpreter which allows you to play
Infocom games on Unix.  I've modified it so that you can give it a -R
flag that puts it in "raw" mode so that it doesn't use curses or
termcap or print the status line and does vanilla terminal i/o.