modules/modules: start module-based implementation

modules/modules/hardware/audio.nix

@@ -0,0 +1,34 @@
+# Created by hlissner: https://github.com/hlissner/dotfiles/blob/master/modules/hardware/audio.nix
+{ options, config, lib, pkgs, ... }:
+
+with lib;
+with lib.hlissner;
+let cfg = config.modules.hardware.audio;
+in
+{
+  options.modules.hardware.audio = {
+    enable = mkBoolOpt false;
+  };
+
+  config = mkIf cfg.enable {
+    sound.enable = true;
+    hardware.pulseaudio.enable = true;
+
+    # HACK Prevents ~/.esd_auth files by disabling the esound protocol module
+    #      for pulseaudio, which I likely don't need. Is there a better way?
+    hardware.pulseaudio.configFile =
+      let inherit (pkgs) runCommand pulseaudio;
+        paConfigFile =
+          runCommand "disablePulseaudioEsoundModule"
+            { buildInputs = [ pulseaudio ]; } ''
+            mkdir "$out"
+            cp ${pulseaudio}/etc/pulse/default.pa "$out/default.pa"
+            sed -i -e 's|load-module module-esound-protocol-unix|# ...|' "$out/default.pa"
+          '';
+      in
+      mkIf config.hardware.pulseaudio.enable
+        "${paConfigFile}/default.pa";
+
+    user.extraGroups = [ "audio" ];
+  };
+}