treewide: move nixos modules

modules/nixos/base/emacs/early-init.el

@@ -0,0 +1,32 @@
+;;; early-init --- My emacs early init file
+;;; Commentary:
+;;; Code:
+(defun hm/reduce-gc ()
+  "Reduce the frequency of garbage collection."
+  (setq gc-cons-threshold most-positive-fixnum
+        gc-cons-percentage 0.6))
+
+(defun hm/restore-gc ()
+  "Restore the frequency of garbage collection."
+  (setq gc-cons-threshold 16777216
+        gc-cons-percentage 0.1))
+
+;; Make GC more rare during init, while minibuffer is active, and
+;; when shutting down. In the latter two cases we try doing the
+;; reduction early in the hook.
+(hm/reduce-gc)
+(add-hook 'minibuffer-setup-hook #'hm/reduce-gc -50)
+(add-hook 'kill-emacs-hook #'hm/reduce-gc -50)
+
+;; But make it more regular after startup and after closing minibuffer.
+(add-hook 'emacs-startup-hook #'hm/restore-gc)
+(add-hook 'minibuffer-exit-hook #'hm/restore-gc)
+
+;; Nix manages our packages
+(setq package-enable-at-startup nil)
+
+;; Avoid expensive frame resizing. Inspired by Doom Emacs.
+(setq frame-inhibit-implied-resize t)
+
+(provide 'early-init)
+;;; early-init.el ends here