refactor

modules/nixos/hardware/audio/default.nix

@@ -0,0 +1,200 @@
+{ options
+, config
+, pkgs
+, lib
+, ...
+}:
+# FIXME: The transition to wireplumber from media-session has completely
+# broken my setup. I'll need to invest some time to figure out how to override Alsa things
+# again...
+with lib;
+with lib.plusultra; let
+  cfg = config.plusultra.hardware.audio;
+
+  lua-format = {
+    type = with lib.types; let
+      valueType =
+        nullOr
+          (oneOf [
+            bool
+            int
+            float
+            str
+            path
+            (attrsOf valueType)
+            (listOf valueType)
+          ])
+        // {
+          description = "Lua value";
+        };
+    in
+    valueType;
+
+    generate = name: value:
+      let
+        toLuaValue = value:
+          if value == null
+          then "null"
+          else if value == true
+          then "true"
+          else if value == false
+          then "false"
+          else if builtins.isInt value || builtins.isFloat value
+          then builtins.toString value
+          else if builtins.isString value
+          then toLuaString value
+          else if builtins.isAttrs value
+          then toLuaTable value
+          else if builtins.isList value
+          then toLuaList value
+          else builtins.abort "Unsupported value used with formats.lua.generate: ${value}";
+
+        toLuaString = value: "\"${builtins.toString value}\"";
+
+        toLuaTable = value:
+          let
+            pairs =
+              mapAttrsToList
+                (name: value: "[${toLuaString name}] = ${toLuaValue value}")
+                value;
+            content = concatStringsSep ", " pairs;
+          in
+          "{ ${content} }";
+
+        toLuaList = value:
+          let
+            parts = builtins.map toLuaValue value;
+            content = concatStringsSep ", " parts;
+          in
+          "{ ${content} }";
+      in
+      toLuaValue value;
+  };
+
+  pipewire-config = {
+    "context.objects" = cfg.nodes ++ [ ];
+    "context.modules" =
+      [
+        {
+          name = "libpipewire-module-rtkit";
+          args = { };
+          flags = [ "ifexists" "nofail" ];
+        }
+        { name = "libpipewire-module-protocol-native"; }
+        { name = "libpipewire-module-profiler"; }
+        # {
+        #   name = "libpipewire-module-metadata";
+        #   flags = [ "ifexists" "nofail" ];
+        # }
+        { name = "libpipewire-module-spa-device-factory"; }
+        { name = "libpipewire-module-spa-node-factory"; }
+        # {
+        #   name = "libpipewire-module-client-node";
+        #   flags = [ "ifexists" "nofail" ];
+        # }
+        # {
+        #   name = "libpipewire-module-client-device";
+        #   flags = [ "ifexists" "nofail" ];
+        # }
+        {
+          name = "libpipewire-module-portal";
+          flags = [ "ifexists" "nofail" ];
+        }
+        {
+          name = "libpipewire-module-access";
+          args = { };
+        }
+        { name = "libpipewire-module-adapter"; }
+        { name = "libpipewire-module-link-factory"; }
+        { name = "libpipewire-module-session-manager"; }
+      ]
+      ++ cfg.modules;
+    "context.components" = [
+      {
+        name = "libwireplumber-module-lua-scripting";
+        type = "module";
+      }
+      {
+        name = "config.lua";
+        type = "config/lua";
+      }
+    ];
+  };
+
+  alsa-config = {
+    alsa_monitor = cfg.alsa-monitor;
+  };
+in
+{
+  options.plusultra.hardware.audio = with types; {
+    enable = mkBoolOpt false "Whether or not to enable audio support.";
+    alsa-monitor = mkOpt attrs { } "Alsa configuration.";
+    nodes =
+      mkOpt (listOf attrs) [ ]
+        "Audio nodes to pass to Pipewire as `context.objects`.";
+    modules =
+      mkOpt (listOf attrs) [ ]
+        "Audio modules to pass to Pipewire as `context.modules`.";
+    extra-packages = mkOpt (listOf package) [
+      pkgs.qjackctl
+      pkgs.easyeffects
+    ] "Additional packages to install.";
+  };
+
+  config = mkIf cfg.enable {
+    security.rtkit.enable = true;
+
+    services.pipewire = {
+      enable = true;
+      alsa.enable = true;
+      pulse.enable = true;
+      jack.enable = true;
+
+      wireplumber.enable = true;
+    };
+
+    environment.etc = {
+      # "pipewire/pipewire.conf.d/10-pipewire.conf".source =
+      #   pkgs.writeText "pipewire.conf" (builtins.toJSON pipewire-config);
+      # "pipewire/pipewire.conf.d/21-alsa.conf".source =
+      #   pkgs.writeText "pipewire.conf" (builtins.toJSON alsa-config);
+
+      #       "wireplumber/wireplumber.conf".source =
+      #         pkgs.writeText "pipewire.conf" (builtins.toJSON pipewire-config);
+
+      # "wireplumber/scripts/config.lua.d/alsa.lua".text = ''
+      #   local input = ${lua-format.generate "sample.lua" cfg.alsa-monitor}
+
+      #   if input.rules == nil then
+      #    input.rules = {}
+      #   end
+
+      #   local rules = input.rules
+
+      #   for _, rule in ipairs(input.rules) do
+      #     table.insert(alsa_monitor.rules, rule)
+      #   end
+      # '';
+    };
+
+    hardware.pulseaudio.enable = mkForce false;
+
+    environment.systemPackages = with pkgs;
+      [
+        pulsemixer
+        pavucontrol
+      ]
+      ++ cfg.extra-packages;
+
+    plusultra.user.extraGroups = [ "audio" ];
+
+    plusultra.home.extraOptions = {
+      systemd.user.services.mpris-proxy = {
+        Unit.Description = "Mpris proxy";
+        Unit.After = [ "network.target" "sound.target" ];
+        Service.ExecStart = "${pkgs.bluez}/bin/mpris-proxy";
+        Install.WantedBy = [ "default.target" ];
+      };
+    };
+  };
+}