Emacs: Run with pure packages if installed via nix This is not a perfect method of detection, but if I install emacs via nix I'm almost certainly going to use my custom derivation. Checking the equality of system-name and emacs-build-system makes it more likely to be correct, as a normal nix emacs build would probably installed from a pre-built hydra package.
Alan Pearce alan@alanpearce.eu
Tue, 06 Jun 2017 11:42:30 +0200
1 files changed, 25 insertions(+), 20 deletions(-)
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M emacs/.emacs.d/init.org → emacs/.emacs.d/init.org
@@ -58,28 +58,35 @@ ** Use-package #+BEGIN_SRC emacs-lisp (eval-and-compile + (defvar nix-emacs (and (string-match "^/nix/store" invocation-directory) + (string-equal emacs-build-system system-name))) + (setq tls-checktrust t gnutls-verify-error t - package-archives '(("gnu" . "https://elpa.gnu.org/packages/") - ("melpa-stable" . "https://stable.melpa.org/packages/") - ("melpa" . "https://melpa.org/packages/")) - package-user-dir (concat "~/.emacs.d/packages/" emacs-version "/elpa") - package-pinned-packages '(("use-package" . melpa-stable) - ("diminish" . melpa-stable) - ("bind-key" . melpa-stable)) - package-archive-priorities '(("melpa" . 10) - ("gnu" . 10) - ("melpa-stable" . 5) - ("marmalade" . 0)) package-menu-async t + package-user-dir (concat "~/.emacs.d/packages/" emacs-version "/elpa") package-menu-hide-low-priority t) + (if nix-emacs + (progn (setq package-archives nil) + (package-initialize)) + (setq package-archives '(("gnu" . "https://elpa.gnu.org/packages/") + ("melpa-stable" . "https://stable.melpa.org/packages/") + ("melpa" . "https://melpa.org/packages/")) + package-pinned-packages '(("use-package" . melpa-stable) + ("diminish" . melpa-stable) + ("bind-key" . melpa-stable)) + package-archive-priorities '(("melpa" . 10) + ("gnu" . 10) + ("melpa-stable" . 5) + ("marmalade" . 0)))) (when (eq system-type 'darwin) (with-eval-after-load "gnutls" (add-to-list 'gnutls-trustfiles "/etc/ssl/cert.pem"))) - (package-initialize) - (unless (package-installed-p 'use-package) - (package-refresh-contents) - (package-install 'use-package))) + (unless nix-emacs + (package-initialize) + (unless (package-installed-p 'use-package) + (package-refresh-contents) + (package-install 'use-package)))) (eval-when-compile (require 'use-package)) (unless (featurep 'use-package) (require 'diminish) @@ -87,7 +94,7 @@ (require 'bind-key) (use-package use-package :commands (use-package-autoload-keymap) :defer 5)) -(setq use-package-always-ensure t +(setq use-package-always-ensure (not nix-emacs) package-enable-at-startup nil) #+END_SRC @@ -2077,15 +2084,13 @@ Let’s try using Scala. #+BEGIN_SRC emacs-lisp -(use-package scala-mode - :pin melpa-stable) +(use-package scala-mode) #+END_SRC And add ensime, an IDE-style environment. #+BEGIN_SRC emacs-lisp -(use-package ensime - :pin melpa-stable) +(use-package ensime) #+END_SRC ** Web development