add audio module

home/modules/audio.nix

@@ -0,0 +1,78 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.modules.audio;
+in {
+  imports = [ ];
+
+  options.modules.audio = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Configure for realtime audio and enable a bunch of music production tools";
+    };
+
+    carla = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Enable Carla + guitar-specific stuff";
+    };
+
+    yabridge = {
+      enable = {
+        type = types.bool;
+        default = false;
+        description = "Enable yabridge + yabridgectl";
+      };
+
+      autosync = {
+        type = types.bool;
+        default = false;
+        description = "Sync yabridge plugins on nixos-rebuild";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    home.packages = with pkgs; (mkMerge [
+      (mkIf cfg.carla [ carla ])
+
+      (mkIf cfg.yabridge.enable [ yabridge yabridgectl ])
+    ]);
+
+
+    # NOTE: This desktop entry is created in /etc/profiles/per-user/christoph/share/applications
+    #       This location is part of XDG_DATA_DIRS
+    xdg.desktopEntries.guitar = mkIf cfg.carla {
+      name = "Guitar Amp (Carla)";
+      genericName = "Guitar Amp Simulation";
+      icon = "carla";
+      exec = "env PIPEWIRE_LATENCY=256/48000 gamemoderun carla ${home.homeDirectory}/.config/carla/GuitarDefault.carxp";
+      terminal = false;
+      categories = [ "Music" "Audio" ];
+    };
+
+    home.activation = (mkMerge [
+      (mkIf cfg.carla {
+
+        # The module includes the default carla project with ArchetypePetrucci + ArchetypeGojira
+        # TODO: I don't know if I should keep this
+        linkCarlaConfig = hm.dag.entryAfter [ "writeBoundary" ] ''
+          if [ ! -L "${config.home.homeDirectory}/.config/carla" ]; then
+            ln -sf ${config.home.homeDirectory}/NixFlake/config/carla ${config.home.homeDirectory}/.config/carla
+          fi
+        '';
+      })
+
+      (mkIf cfg.yabridge.autosync {
+        syncYabridge = hm.dag.entryAfter [ "writeBoundary" ] ''
+          yabridgectl sync
+        '';
+      })
+    ]);
+
+  };
+}