28af585f3d
I'm currently setting NIX_PATH in ~/briefcase/shell.nix. This means when I call `nix/rebuild-emacs` from a buffer that is inside the briefcase directory, the command succeeds because NIX_PATH is properly defined. When I call `nix/rebuild-emacs` from any other location it fails. I'm hard-coding the NIX_PATH in this command so that I can call `nix/rebuild-emacs` from any buffer that is currently active.
79 lines
3.5 KiB
EmacsLisp
79 lines
3.5 KiB
EmacsLisp
;;; wpc-nix.el --- Nix support -*- lexical-binding: t -*-
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;; Author: William Carroll <wpcarro@gmail.com>
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;;; Commentary:
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;; Configuration to support working with Nix.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Dependencies
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; TODO: These may fail at startup. How can I make sure that the .envrc is
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;; consulted when Emacs starts?
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(prelude/assert (f-exists? (getenv "BRIEFCASE")))
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(prelude/assert (f-exists? (getenv "DEPOT")))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Library
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(use-package nix-mode
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:mode "\\.nix\\'")
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;; TODO(wpcarro): Ensure the sub-process can resolve <briefcase>.
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(defun nix/rebuild-emacs ()
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"Use nix-env to rebuild wpcarros-emacs."
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(interactive)
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(start-process "nix-build/<briefcase/emacs>" "*nix-build/<briefcase/emacs>*"
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"nix-env"
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"-I" (format "nixpkgs=%s" (f-expand "~/nixpkgs"))
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"-I" (format "depot=%s" (f-expand "~/depot"))
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"-I" (format "briefcase=%s" (f-expand "~/briefcase"))
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"-f" "<briefcase>" "-iA" "emacs")
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(display-buffer "*nix-build/<briefcase/emacs>*"))
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(defun nix/home-manager-switch ()
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"Use Nix to reconfigure the user environment."
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(interactive)
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(start-process "nix/home-manager-switch" "*nix/home-manager-switch*"
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"home-manager"
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"-I" (format "nixpkgs=%s" (f-expand "~/nixpkgs"))
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"-I" (format "home-manager=%s" (f-expand "~/home-manager"))
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"switch")
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(display-buffer "*nix/home-manager-switch*"))
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(defun nix/sly-from-briefcase (attribute)
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"Start a Sly REPL configured with a Lisp matching a derivation
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from my monorepo.
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This function was taken from @tazjin's depot and adapted for my monorepo.
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The derivation invokes nix.buildLisp.sbclWith and is built
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asynchronously. The build output is included in the error
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thrown on build failures."
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(interactive "sAttribute: ")
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(lexical-let* ((outbuf (get-buffer-create (format "*briefcase-out/%s*" attribute)))
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(errbuf (get-buffer-create (format "*briefcase-errors/%s*" attribute)))
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(expression (format "let depot = import <depot> {}; briefcase = import <briefcase> {}; in depot.nix.buildLisp.sbclWith [ briefcase.%s ]" attribute))
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(command (list "nix-build" "-E" expression)))
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(message "Acquiring Lisp for <briefcase>.%s" attribute)
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(make-process :name (format "nix-build/%s" attribute)
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:buffer outbuf
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:stderr errbuf
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:command command
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:sentinel
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(lambda (process event)
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(unwind-protect
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(pcase event
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("finished\n"
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(let* ((outpath (s-trim (with-current-buffer outbuf (buffer-string))))
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(lisp-path (s-concat outpath "/bin/sbcl")))
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(message "Acquired Lisp for <briefcase>.%s at %s" attribute lisp-path)
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(sly lisp-path)))
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(_ (with-current-buffer errbuf
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(error "Failed to build '%s':\n%s" attribute (buffer-string)))))
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(kill-buffer outbuf)
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(kill-buffer errbuf))))))
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(provide 'wpc-nix)
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;;; wpc-nix.el ends here
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