wob: implement as part of sway instead of exclusive to sxmo

hosts/common/programs/wob.nix

@@ -2,9 +2,11 @@
 # - <https://github.com/francma/wob/blob/master/wob.ini.5.scd>
 # - `wob -vv` to see config defaults
 #
+# the wob services defined here are largely based on those from SXMO.
+#
 # this should arguably be just a (user) service. nothing actually needs `wob` on the PATH.
 #
-{ config, lib, ... }:
+{ config, lib, pkgs, ... }:
 let
   cfg = config.sane.programs.wob;
 in
@@ -60,14 +62,65 @@ in
         Restart = "always";
         RestartSec = "20s";
       };
+      path = [ cfg.package ];
       script = ''
         wobsock="$XDG_RUNTIME_DIR/${cfg.config.sock}"
         rm -f "$wobsock" || true
-        mkfifo "$wobsock" && ${cfg.package}/bin/wob <> "$wobsock"
+        mkfifo "$wobsock" && wob <> "$wobsock"
 
         # TODO: cleanup should be done in a systemd OnFailure, or OnExit, or whatever
         rm -f "$wobsock"
       '';
     };
+
+    services.wob-pulse = {
+      description = "notify wob when pulseaudio volume changes";
+      wantedBy = [ "wob.service" ];
+      serviceConfig = {
+        Type = "simple";
+        Restart = "always";
+        RestartSec = "20s";
+      };
+      path = with pkgs; [
+        # coreutils
+        gnugrep
+        gnused
+        pulseaudio
+      ];
+
+      script = ''
+
+        volismuted() {
+          pactl get-sink-mute @DEFAULT_SINK@ | grep -q "Mute: yes"
+        }
+
+        volget() {
+          if volismuted; then
+            printf "0"
+          else
+            pactl get-sink-volume @DEFAULT_SINK@ | head -n1 | cut -d'/' -f2 | sed 's/ //g' | sed 's/\%//'
+          fi
+        }
+
+        notify_volume_change() {
+          vol=$(volget)
+          if [ "$vol" != "$lastvol" ]; then
+            printf "%s\n" "$vol" > "$XDG_RUNTIME_DIR/${cfg.config.sock}"
+          fi
+          lastvol="$vol"
+        }
+
+        pactl subscribe | while read -r line; do
+          case "$line" in
+            "Event 'change' on sink "*)
+              notify_volume_change
+              ;;
+            "Event 'change' on source "*)
+              # microphone volume changed. ignore.
+              ;;
+          esac
+        done
+      '';
+    };
   };
 }

hosts/modules/gui/sway/default.nix

@@ -181,7 +181,7 @@ in
           "playerctl"  # for waybar & particularly to have playerctld running
           # "mako"  # notification daemon
           "swaynotificationcenter"  # notification daemon
-          # # "pavucontrol"
+          "wob"  # render volume changes on-screen
           # "gnome.gnome-bluetooth"  # XXX(2023/05/14): broken
           # "gnome.gnome-control-center"  # XXX(2023/06/28): depends on webkitgtk4_1
           "sway-contrib.grimshot"

hosts/modules/gui/sxmo/default.nix

@@ -269,7 +269,6 @@ in
           "sfeed"   # want this here so that the user's ~/.sfeed/sfeedrc gets created
           # "superd"  # make superctl (used by sxmo) be on PATH
           # "sway-autoscaler"
-          "wob"  # volume/brightness on-screen display
         ];
 
         persist.byStore.cryptClearOnBoot = [
@@ -628,15 +627,18 @@ in
             serviceConfig.RestartSec = "20s";
           };
         in {
+          # these are defined here, and started mostly in sxmo_hook_start.sh.
+          # the ones commented our here are the ones i explicitly no longer use.
+          # uncommenting them here *won't* cause them to be auto-started.
           sxmo_autosuspend = sxmoService "autosuspend";
-          sxmo_battery_monitor = sxmoService "battery_monitor";
+          # sxmo_battery_monitor = sxmoService "battery_monitor";
           sxmo_desktop_widget = sxmoService "hook_desktop_widget";
           sxmo_hook_lisgd = sxmoService "hook_lisgdstart";
           sxmo_menumode_toggler = sxmoService "menumode_toggler";
           sxmo_modemmonitor = sxmoService "modemmonitor";
-          sxmo_networkmonitor = sxmoService "networkmonitor";
+          # sxmo_networkmonitor = sxmoService "networkmonitor";
           sxmo_notificationmonitor = sxmoService "notificationmonitor";
-          sxmo_soundmonitor = sxmoService "soundmonitor";
+          # sxmo_soundmonitor = sxmoService "soundmonitor";
           # sxmo_wob = sxmoService "wob";
           sxmo-x11-status = sxmoService "status_xsetroot";
 

hosts/modules/gui/sxmo/hooks/sxmo_hook_start.sh

@@ -64,7 +64,8 @@ systemctl --user start sxmo_notificationmonitor
 
 # monitor for headphone for statusbar
 # this also invokes `wob` whenever the volume is changed
-systemctl --user start sxmo_soundmonitor
+# don't: my volume monitoring is handled by sway
+#   systemctl --user start sxmo_soundmonitor
 
 # rotate UI based on physical display angle by default
 if [ -n "$SXMO_AUTOROTATE" ]; then