emacs: Only install packages when not using nix

modules/home/caem/development/emacs/emacs.d/core/appearance.el

@@ -16,12 +16,12 @@
 (setq compilation-scroll-output t)
 
 (use-package rainbow-delimiters
-  :ensure t
+  :ensure nil
   :hook
   ((prog-mode . rainbow-delimiters-mode)))
 
 (use-package darktooth-theme
-  :ensure t
+  :ensure nil
   :config
   (load-theme 'darktooth-dark t)
   (set-face-background 'hl-line "#262626"))

modules/home/caem/development/emacs/emacs.d/core/ido.el

@@ -1,16 +1,16 @@
 (use-package smex
-  :ensure t
+  :ensure nil
   :bind
   (("M-x" . smex)
    ("M-X" . smex-major-mode-commands))
   :config (smex-initialize))
 
 (use-package ido-completing-read+
-  :ensure t
+  :ensure nil
   :config (ido-ubiquitous-mode 1))
 
 (use-package amx
-  :ensure t
+  :ensure nil
   :config (amx-mode 1))
 
 (ido-mode 1)

modules/home/caem/development/emacs/emacs.d/core/init.el

@@ -1,3 +1,4 @@
+(rei/load "nix.el")
 (rei/load "repositories.el")
 (rei/load "litter.el")
 (rei/load "appearance.el")

modules/home/caem/development/emacs/emacs.d/core/litter.el

@@ -3,7 +3,7 @@
       backup-by-copying t)
 
 (use-package no-littering
-  :ensure t
+  :ensure nil
   :init
   (setq no-littering-etc-directory (file-name-concat (xdg-data-home) "emacs")
         no-littering-var-directory (file-name-concat (xdg-data-home) "emacs"))

modules/home/caem/development/emacs/emacs.d/core/nix.el

@@ -0,0 +1,9 @@
+;; If we're already using Nix, make sure we're only using
+;; the Nix provided packages instead of downloading them from
+;; (m)elpa and co as it's not really necassary as we've already
+;; got Nix to do this job and this is a much cleaner solution.
+(if (file-exists-p "/nix/store")
+    (setq using-nix t
+          use-package-always-ensure nil)
+  (setq using-nix nil
+        use-package-always-ensure t))

modules/home/caem/development/emacs/emacs.d/core/repositories.el

@@ -1,8 +1,10 @@
-;; Set the elpa directory ahead of loading the no-littering package, as it would
+(require 'package)
-;; otherwise cause it to be installed in the configuration directory as no-littering
-;; has to be first insalled from melpa before being able to be called.
 (setq package-user-dir (file-name-concat (xdg-data-home) "emacs" "elpa"))
 
-(require 'package)
+(if using-nix
+    (progn
       (add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/"))
-(package-initialize)
+      (package-initialize))
+  (progn
+    (setq package-archives nil)
+    (package-initialize)))

modules/home/caem/development/emacs/emacs.d/core/tree-sitter.el

@@ -3,7 +3,7 @@
 (setq treesit-font-lock-level 4)
 
 (use-package treesit-auto
-  :ensure t
+  :ensure nil
   :custom
   (treesit-auto-install 'prompt)
   :config

modules/home/caem/development/emacs/emacs.d/init.el

@@ -5,4 +5,3 @@
 (require 'rei)
 (rei/load "core")
 (rei/load "modes")
-(rei/load "plugins")

modules/home/caem/development/emacs/emacs.d/modes/init.el

@@ -1,5 +1,5 @@
 (use-package paredit
-  :ensure t
+  :ensure nil
   :hook
   ((prog-mode . enable-paredit-mode))
   :config

modules/home/caem/development/emacs/emacs.d/modes/meson-mode.el

@@ -1,3 +1,3 @@
 (use-package meson-mode
-  :ensure t
+  :ensure nil
   :mode ("meson\\.build\\'"))

modules/home/caem/development/emacs/emacs.d/modes/nix-mode.el

@@ -1,5 +1,5 @@
 (use-package nix-mode
-  :ensure t
+  :ensure nil
   :mode ("\\.nix\\'" "\\.nix.in\\'")
   :hook
   (nix-mode . (lambda ()

modules/home/caem/development/emacs/emacs.d/plugins/init.el

@@ -1 +0,0 @@
-(rei/load "vterm.el")

modules/home/caem/development/emacs/emacs.d/plugins/vterm.el

@@ -1,2 +0,0 @@
-(use-package vterm
-  :ensure t)