home: custom packages list for foreign distros

Running on GNU/Linux Debian testing for example allows me to have access
to more up-to-date and better maintained software compared to Guix when
needed. For now, certain software will be installed through apt instead
of Guix itself such as mpd, mpv and neovim. The user will have to
manually check if Guix-installed packages are compatible with the
apt-installed ones.

nichijou/home/mpd.scm

@@ -2,10 +2,13 @@
   #:use-module (gnu home services)
   #:use-module (gnu packages mpd)
   #:use-module (gnu services)
-  #:use-module (guix gexp))
+  #:use-module (guix gexp)
+  #:use-module (ice-9 optargs))
 
-(define-public packages
-  (list mpd))
+(define*-public (get-packages #:key (foreign-distro? #f))
+  (if foreign-distro?
+      (list)
+      (list mpd)))
 
 ;; TODO: Write MPD home service?
 (define-public services

nichijou/home/mpv.scm

@@ -2,10 +2,13 @@
   #:use-module (gnu home services)
   #:use-module (gnu packages video)
   #:use-module (gnu services)
-  #:use-module (guix gexp))
+  #:use-module (guix gexp)
+  #:use-module (ice-9 optargs))
 
-(define-public packages
-  (list mpv mpv-mpris))
+(define*-public (get-packages #:key (foreign-distro? #f))
+  (if foreign-distro?
+      (list)
+      (list mpv mpv-mpris)))
 
 ;; TODO: Implement mpv home service?
 (define-public services

nichijou/home/nvim.scm

@@ -3,11 +3,11 @@
   #:use-module (gnu packages vim)
   #:use-module (gnu services)
   #:use-module (guix gexp)
+  #:use-module (ice-9 optargs)
   #:use-module (nichijou packages vim))
 
-(define-public packages
-  (list neovim
-        vim-airline
+(define plugins
+  (list vim-airline
         vim-airline-themes
         vim-bbye
         vim-ctrlp
@@ -21,6 +21,10 @@
         vim-syntastic
         vim-tagbar))
 
+(define*-public (get-packages #:key (foreign-distro? #f))
+  (if foreign-distro? plugins
+      (const neovim plugins)))
+
 (define-public services
   (list (simple-service 'nichijou-nvim-config home-files-service-type
                         `((".config/nvim/init.vim" ,(local-file

nichijou/home/zsh.scm

@@ -6,9 +6,13 @@
   #:use-module (guix gexp)
   #:use-module (ice-9 optargs))
 
-(define-public packages
+(define packages
   (list zsh-syntax-highlighting zsh-autosuggestions fzf))
 
+(define*-public (get-packages #:key (foreign-distro? #f))
+  (if foreign-distro?
+      (list) packages))
+
 (define-public services
   (list (service home-zsh-service-type
                  (home-zsh-configuration (xdg-flavor? #t)