tvl-depot/users/aspen/emacs.d/nix.el

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;;; -*- lexical-binding: t; -*-
(defun nix-buffer-type ()
"Returns:
'home-manager, if the current buffer is a home-manager module
'nixos, if the current buffer is a nixos module
nil, if none of the above are the case"
(when buffer-file-name
(pcase buffer-file-name
((rx (0+ nonl) "system/home" (0+ nonl) ".nix" eos)
'home-manager)
((rx (0+ nonl) "system/system" (0+ nonl) ".nix" eos)
'nixos))))
(defun set-nix-compile-command ()
"Set the compile command for the current buffer based on the type of nix
buffer it is, per `nix-buffer-type'"
(interactive)
(when-let ((btype (nix-buffer-type)))
(setq-local
compile-command
(case btype
('home-manager "home-manager switch")
('nixos "sudo nixos-rebuild switch")))))
(add-hook 'nix-mode-hook #'set-nix-compile-command)
(map! (:map nix-mode-map
(:n "g SPC" #'compile)))