Update README with instructions, add script to handle package installs

README.org

@@ -6,4 +6,14 @@ Personal Emacs config.
 
 Clone to =~/.config/emacs/= (or =~/.emacs.d/=).
 
-* TODO Fill out README
+To install packages on non-NixOS systems:
+
+#+begin_src emacs-lisp
+  (setq prog-mode-hook nil
+        lisp-data-mode-hook nil)
+  (package-install-selected-packages)
+  ;; Optionally autoremove unneeded packages:
+  (package-autoremove)
+#+end_src
+
+Or just run ~install.el~ for the same effect.

init.el

@@ -3,7 +3,9 @@
 ;; Moving my Emacs config from separate directory
 ;; To install packages on non-NixOS systems:
 ;; `(setq prog-mode-hook nil lisp-data-mode-hook nil)'
-;; `M-x package-install-selected-packages'
+;; `(package-install-selected-packages)'
+;; Optionally autoremove unneeded packages:
+;; `(package-autoremove)'
 ;;; Code:
 ;; Stop popups for warning messages, keep in log buffer
 (setopt warning-minimum-level :error)

install.el

@@ -0,0 +1,9 @@
+;;; install.el -- Handle installing selected packages -*- lexical-binding: t -*-
+;;; Commentary:
+;;; Code:
+(setq prog-mode-hook nil
+      lisp-data-mode-hook nil)
+(package-install-selected-packages)
+(package-autoremove)
+(provide 'install)
+;;; install.el ends here