···

       
26
       
26
       
 
       
{

     

       
27
       
27
       
 
       
  packageOverrides = pkgs: with pkgs; rec {

     

       
28
       
28
       
 
       
    myEmacsConfig = writeText "default.el" ''

     

       
29
       
29
       
-
       
      ;; initialize package

     

       
30
       
30
       
-
       


     

       
31
       
31
       
-
       
      (require 'package)

     

       
32
       
32
       
-
       
      (package-initialize 'noactivate)

     

       
33
       
29
       
 
       
      (eval-when-compile

     

       
34
       
30
       
 
       
        (require 'use-package))

     

       
35
       
31
       
 
       


     

···

       
339
       
339
       
 
       


     

       
340
       
340
       
 
       
## Configuring Emacs {#module-services-emacs-configuring}

     

       
341
       
341
       
 
       


     

       
342
       
342
       
-
       
The Emacs init file should be changed to load the extension packages at

     

       
343
       
343
       
-
       
startup:

     

       
344
       
344
       
-
       


     

       
345
       
345
       
-
       
::: {.example #module-services-emacs-package-initialisation}

     

       
346
       
346
       
-
       
### Package initialization in `.emacs`

     

       
347
       
347
       
-
       


     

       
348
       
348
       
-
       
```

     

       
349
       
349
       
-
       
(require 'package)

     

       
350
       
350
       
-
       


     

       
351
       
351
       
-
       
;; optional. makes unpure packages archives unavailable

     

       
352
       
352
       
-
       
(setq package-archives nil)

     

       
353
       
353
       
-
       


     

       
354
       
354
       
-
       
(setq package-enable-at-startup nil)

     

       
355
       
355
       
-
       
(package-initialize)

     

       
356
       
356
       
-
       
```

     

       
357
       
357
       
-
       
:::

     

       
342
       
342
       
+
       
If you want to only use extension packages from Nixpkgs, you can add

     

       
343
       
343
       
+
       
`(setq package-archives nil)` to your init file.

     

       
358
       
344
       
 
       


     

       
359
       
345
       
 
       
After the declarative Emacs package configuration has been tested,

     

       
360
       
346
       
 
       
previously downloaded packages can be cleaned up by removing

     

···

       
7
       
7
       
 
       
# Alternative: use `emacs`, install everything to a system or user profile

     

       
8
       
8
       
 
       
# and then add this at the start your `init.el`:

     

       
9
       
9
       
 
       
/*

     

       
10
       
10
       
-
       
  (require 'package)

     

       
11
       
11
       
-
       


     

       
12
       
12
       
-
       
  ;; optional. makes unpure packages archives unavailable

     

       
13
       
13
       
-
       
  (setq package-archives nil)

     

       
14
       
14
       
-
       


     

       
15
       
10
       
 
       
  ;; optional. use this if you install emacs packages to the system profile

     

       
16
       
11
       
 
       
  (add-to-list 'package-directory-list "/run/current-system/sw/share/emacs/site-lisp/elpa")

     

       
17
       
12
       
 
       


     

       
18
       
13
       
 
       
  ;; optional. use this if you install emacs packages to user profiles (with nix-env)

     

       
19
       
14
       
 
       
  (add-to-list 'package-directory-list "~/.nix-profile/share/emacs/site-lisp/elpa")

     

       
20
       
20
       
-
       


     

       
21
       
21
       
-
       
  (package-initialize)

     

       
22
       
15
       
 
       
*/

     

       
23
       
16
       
 
       


     

       
24
       
17
       
 
       
{ pkgs'