party/colorchord: support multiple sound devices

machines/party/services/colorchord.nix

@@ -1,6 +1,6 @@
 { inputs, lib, pkgs, ... }:
 let
-  devices = {
+  ledDevices = {
     traverse = {
       leds = 116;
       host = "wled-Traverse";
@@ -31,6 +31,19 @@ let
       host = "wled-Bar";
     };
   };
+  soundDevices = {
+    sink = "alsa_output.usb-BurrBrown_from_Texas_Instruments_USB_AUDIO_CODEC-00.analog-stereo.monitor";
+    source = "alsa_input.usb-BurrBrown_from_Texas_Instruments_USB_AUDIO_CODEC-00.analog-stereo";
+  };
+
+  devicesProduct = lib.fold
+    (soundDevice: acc: acc // lib.mapAttrs'
+      (ledDevice: value: lib.nameValuePair "${ledDevice}-${soundDevice.name}" (value // {
+        source = soundDevice.id;
+      }))
+      ledDevices)
+    { }
+    (lib.attrValues (lib.mapAttrs (n: v: { name = n; id = v; }) soundDevices));
 in
 {
   environment.systemPackages = with pkgs; [
@@ -49,7 +62,7 @@ in
           # Audio input
           amplify = 10
           samplerate = 48000
-          devrecord = alsa_output.usb-BurrBrown_from_Texas_Instruments_USB_AUDIO_CODEC-00.analog-stereo.monitor
+          devrecord = ${config.source}
 
           # Visualiser
           cpu_autolimit = 1
@@ -71,23 +84,29 @@ in
           skipfirst = 0
         '';
       })
-    devices;
+    devicesProduct;
 
-  systemd.user.services."colorchord@" = {
-    partOf = [ "colorchord.target" ];
-    serviceConfig = {
-      ExecStart = ''
-        ${pkgs.colorchord2}/bin/colorchord /etc/colorchord/%i.conf
-      '';
-      Restart = "always";
-    };
-  };
+  systemd.user.services = builtins.listToAttrs (map
+    (soundDevice: lib.nameValuePair
+      "colorchord-${soundDevice}@"
+      {
+        partOf = [ "colorchord-${soundDevice}.target" ];
+        serviceConfig = {
+          ExecStart = ''
+            ${pkgs.colorchord2}/bin/colorchord /etc/colorchord/%i-${soundDevice}.conf
+          '';
+          Restart = "always";
+        };
+      })
+    (lib.attrNames soundDevices));
 
-  systemd.user.targets."colorchord" = {
-    wantedBy = [ "graphical-session.target" ];
-    partOf = [ "graphical-session.target" ];
-    wants = map (name: "colorchord@${name}.service") (lib.attrNames devices);
-  };
+  systemd.user.targets = builtins.listToAttrs (map
+    (soundDevice: lib.nameValuePair
+      "colorchord-${soundDevice}"
+      {
+        wants = map (ledDevice: "colorchord-${soundDevice}@${ledDevice}.service") (lib.attrNames ledDevices);
+      })
+    (lib.attrNames soundDevices));
 
   nixpkgs.overlays = with inputs; [
     sbruder-overlay.overlay