WIP: ADD NOTE FOR FUTURE SELF

Otherwise it keeps nagging me with a hint to set it.

I'm not a big fan of this UI, I wish I add something closer to Git's
patch interface.

modules/home/discord/default.nix

@@ -1,6 +1,8 @@
 { config, lib, pkgs, ... }:
 let
   cfg = config.my.home.discord;
+
+  jsonFormat = pkgs.formats.json { };
 in
 {
   options.my.home.discord = with lib; {
@@ -10,15 +12,14 @@ in
   };
 
   config = lib.mkIf cfg.enable {
-    programs.discord = {
-      enable = true;
+    home.packages = with pkgs; [
+      cfg.package
+    ];
 
-      inherit (cfg) package;
-
-      settings = {
+    xdg.configFile."discord/settings.json".source =
+      jsonFormat.generate "discord.json" {
         # Do not keep me from using the app just to force an update
         SKIP_HOST_UPDATE = true;
       };
-    };
   };
 }

pkgs/diff-flake/diff-flake

@@ -24,15 +24,11 @@ current_system() {
     nix eval --raw --impure --expr 'builtins.currentSystem'
 }
 
-add_darwin() {
-    FLAKE_OUTPUTS+=("darwinConfigurations.\"$1\".config.system.build.toplevel")
-}
-
 add_home() {
     FLAKE_OUTPUTS+=("homeConfigurations.\"$1\".activationPackage")
 }
 
-add_nixos() {
+add_host() {
     FLAKE_OUTPUTS+=("nixosConfigurations.\"$1\".config.system.build.toplevel")
 }
 
@@ -41,10 +37,6 @@ add_shell() {
     FLAKE_OUTPUTS+=("devShells.\"$(current_system)\".\"$1\".inputDerivation")
 }
 
-add_system() {
-    FLAKE_OUTPUTS+=("systemConfigs.\"$1\".config.system.build.toplevel")
-}
-
 usage() {
     print_err "Usage: $0 [option]... [-- [nix build option]...]"
     print_err ""
@@ -62,15 +54,11 @@ usage() {
     print_err "  -p, --previous-rev"
     print_err "    which git revision should be considered the 'previous' state,"
     print_err "    defaults to HEAD~"
-    print_err "  --darwin [name]"
-    print_err "    specify the name of a nix-darwin output configuration whose"
-    print_err "    closure should be diffed, can be used multiple times"
-    print_err "    if no host name is given, defaults to current hostname"
     print_err "  --home [name]"
     print_err "    specify the name of a home-manager output configuration whose"
     print_err "    closure should be diffed, can be used multiple times"
     print_err "    if no configuration name is given, defaults to current username"
-    print_err "  --nixos [name]"
+    print_err "  --host [name]"
     print_err "    specify the name of a NixOS output configuration whose"
     print_err "    closure should be diffed, can be used multiple times"
     print_err "    if no host name is given, defaults to current hostname"
@@ -78,10 +66,6 @@ usage() {
     print_err "    specify a specific devShell configuration name whose closure"
     print_err "    should be diffed, can be used multiple times"
     print_err "    if no name is given, defaults to 'default'"
-    print_err "  --system [name]"
-    print_err "    specify the name of a system-manager output configuration whose"
-    print_err "    closure should be diffed, can be used multiple times"
-    print_err "    if no host name is given, defaults to current hostname"
     print_err ""
     print_err "when no flake outputs are specified, automatically queries for"
     print_err "all NixOS configurations, and devShells for current system"
@@ -117,14 +101,6 @@ parse_args() {
                 PREVIOUS_REV="$(git rev-parse "$1")"
                 shift
                 ;;
-            --darwin)
-                if [ $# -gt 0 ] && ! is_option "$1"; then
-                    add_darwin "$1"
-                    shift
-                else
-                    add_darwin "$(hostname)"
-                fi
-                ;;
             --home)
                 if [ $# -gt 0 ] && ! is_option "$1"; then
                     add_home "$1"
@@ -133,12 +109,12 @@ parse_args() {
                     add_home "$USER"
                 fi
                 ;;
-            --nixos)
+            --host)
                 if [ $# -gt 0 ] && ! is_option "$1"; then
-                    add_nixos "$1"
+                    add_host "$1"
                     shift
                 else
-                    add_nixos "$(hostname)"
+                    add_host "$(hostname)"
                 fi
                 ;;
             --shell)
@@ -149,14 +125,6 @@ parse_args() {
                     add_shell "default"
                 fi
                 ;;
-            --system)
-                if [ $# -gt 0 ] && ! is_option "$1"; then
-                    add_system "$1"
-                    shift
-                else
-                    add_system "$(hostname)"
-                fi
-                ;;
             --)
                 NIX_BUILD_ARGS=("$@")
                 break
@@ -170,12 +138,6 @@ parse_args() {
     done
 }
 
-list_darwin_configurations() {
-    nix eval '.#darwinConfigurations' \
-        --apply 'attrs: with builtins; concatStringsSep "\n" (attrNames attrs)' \
-        --raw
-}
-
 list_home_configurations() {
     nix eval '.#homeConfigurations' \
         --apply 'attrs: with builtins; concatStringsSep "\n" (attrNames attrs)' \
@@ -194,12 +156,6 @@ list_dev_shells() {
         --raw
 }
 
-list_system_configurations() {
-    nix eval '.#systemConfigs' \
-        --apply 'attrs: with builtins; concatStringsSep "\n" (attrNames attrs)' \
-        --raw
-}
-
 diff_output() {
     local PREV NEW
     PREV="$(mktemp --dry-run)"
@@ -219,21 +175,15 @@ diff_output() {
 parse_args "$@"
 
 if [ "${#FLAKE_OUTPUTS[@]}" -eq 0 ]; then
-    for darwin in $(list_darwin_configurations); do
-        add_darwin "$darwin"
-    done
     for home in $(list_home_configurations); do
         add_home "$home"
     done
-    for nixos in $(list_nixos_configurations); do
-        add_nixos "$nixos"
+    for host in $(list_nixos_configurations); do
+        add_host "$host"
     done
     for shell in $(list_dev_shells); do
         add_shell "$shell"
     done
-    for system in $(list_system_configurations); do
-        add_system "$system"
-    done
 fi
 
 for out in "${FLAKE_OUTPUTS[@]}"; do