Parameterizes nixos config.

flake.nix

@@ -32,7 +32,7 @@
           packages = pkgs.mmelodies;
         }
         ) // {
-          nixosModules.default = import ./nixos;
+          nixosModules.default = (import ./nixos self);
           overlay = 
           (final: super: {
             napalm = import inputs.napalm { pkgs = super; };

nixos/default.nix

@@ -1,52 +1,101 @@
-{pkgs, config, ...}:
+mmelodies:
+{pkgs, config, lib, ...}:
+let
+  cfg = config.services.mmelodies;
+in
 {
-  services.nginx.enable = true;
-
-  services.nginx.virtualHosts."${config.networking.hostName}" = {
-    addSSL = true;
-    sslCertificate = "/etc/ssl/snakeoil.crt";
-    sslCertificateKey = "/etc/ssl/snakeoil.key";
-    root = pkgs.mmelodies.frontend;
-    locations."/api" = {
-      proxyPass = "http://unix:/run/mmelodies/backend.sock";
-      proxyWebsockets = true;
+  options.services.mmelodies = with lib; {
+    audioDevice = mkOption {
+      type = types.str;
+      default = "0";
+    };
+    midiDevice = mkOption {
+      type = with types; nullOr str;
+      default = null;
+    };
+    hostName = mkOption {
+      type = types.str;
+      default = config.networking.hostName;
+    };
+    sslCert = mkOption {
+      type = types.str;
+      default = "/etc/ssl/snakeoil.crt";
+    };
+    sslKey = mkOption {
+      type = types.str;
+      default = "/etc/ssl/snakeoil.key";
     };
   };
+  config = {
+    nix.registry.mmelodies.flake = mmelodies;
+    services.nginx.enable = true;
 
-  networking.firewall.allowedTCPPorts = [ 80 443 ];
+    sound.extraConfig = ''
+      pcm.!default {
+        type hw
+        card ${cfg.audioDevice}
+      }
+      ctl.!default {
+        type hw
+        card ${cfg.audioDevice}
+      }
+    '';
 
-  systemd.services.mmelodies = {
-    wantedBy = [ "multi-user.target" ];
-    after = [ "network.target" ];
-    before = [ "nignx.target" ];
-    serviceConfig = {
-      User = "nginx";
-      Group = "nginx";
-      Type = "simple";
-      ExecStart = "${pkgs.mmelodies.backend}/bin/mmelodies -l unix:/run/mmelodies/backend.sock";
-      Restart = "always";
+    services.nginx.virtualHosts."${cfg.hostName}" = {
+      addSSL = true;
+      sslCertificate = cfg.sslCert;
+      sslCertificateKey = cfg.sslKey;
+      root = pkgs.mmelodies.frontend;
+      locations."/api" = {
+        proxyPass = "http://unix:/run/mmelodies/backend.sock";
+        proxyWebsockets = true;
+      };
     };
-  };
 
-  systemd.services.phyzzy = {
-    wantedBy = [ "multi-user.target" ];
-    serviceConfig = {
-      User = "appuser";
-      Group = "audio";
-      ExecStart = "${pkgs.mmelodies.synth}/bin/phyzzy -midiindev 1 -nogui";
-      
-      Restart = "always";
-      CPUSchedulingPolicy = "fifo";
-      CPUSchedulingPriority = "20";
+    networking.firewall.allowedTCPPorts = [ 80 443 ];
+
+    users.users.appuser = {
+      isSystemUser = true;
+      group = "audio";
     };
+
+    systemd.services.mmelodies = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+      before = [ "nignx.target" ];
+      serviceConfig = {
+        User = "nginx";
+        Group = "nginx";
+        Type = "simple";
+        ExecStart = "${pkgs.mmelodies.backend}/bin/mmelodies -l unix:/run/mmelodies/backend.sock";
+
+        Restart = "always";
+      };
+    };
+
+    systemd.services.phyzzy = {
+      wantedBy = [ "multi-user.target" ];
+
+      postStart = lib.mkIf (! isNull cfg.midiDevice) ''
+          ${pkgs.coreutils}/bin/sleep 5
+          ${pkgs.alsa-utils}/bin/aconnect '${cfg.midiDevice}' 'Pure Data'
+        '';
+
+      serviceConfig = {
+        User = "appuser";
+        Group = "audio";
+
+        Type = "simple";
+        ExecStart = "${pkgs.mmelodies.synth}/bin/phyzzy -nogui";
+
+        Restart = "always";
+        CPUSchedulingPolicy = "fifo";
+        CPUSchedulingPriority = "20";
+      };
+    };
+
+    systemd.tmpfiles.rules = [
+      "d /run/mmelodies 0755 nginx nginx 12h -"
+    ];
   };
-
-  environment.systemPackages = with pkgs.mmelodies; [
-    synth backend
-  ];
-
-  systemd.tmpfiles.rules = [
-    "d /run/mmelodies 0755 nginx nginx 12h -"
-  ];
-  
 }