deduce-mode
is an Emacs major mode for syntax highlighting in deduce.
To turn it on:
M-x deduce-mode
To turn it on automatically for .pf
files:
(add-to-list 'auto-mode-alist '("\\.pf\\'" . deduce-mode))
For now you can install the package from the buffer. Open up deduce-mode.el
and issue
M-x package-install-from-buffer