wm-helpers: add volume cap and unmute

pkgs/wm-helpers/default.nix

@@ -1,16 +1,32 @@
-{ pkgs, ...}:
+{ pkgs, lib, cap-volume ? true, unmute ? true, ...}:
 let
-  keysetting = pkgs.writeShellScriptBin "keysetting" ''
+  keysetting = pkgs.writeShellScriptBin "keysetting"
+  ''
     wpctl=${pkgs.wireplumber}/bin/wpctl
     notify_send=${pkgs.libnotify}/bin/notify-send
     brightnessctl=${pkgs.brightnessctl}/bin/brightnessctl
+    cut=${pkgs.coreutils}/bin/cut
+    grep=${pkgs.gnugrep}/bin/grep
+    tr=${pkgs.coreutils}/bin/tr
+    bc=${pkgs.bc}/bin/bc
+
+    cap_volume=${pkgs.coreutils}/bin/${lib.boolToString cap-volume}
+    unmute=${pkgs.coreutils}/bin/${lib.boolToString unmute}
 
     notify-send () {
       $notify_send -h string:x-canonical-private-synchronous:keysetting "$@"
     }
 
+    getvol () {
+      echo "$(wpctl get-volume @DEFAULT_SINK@ | $tr -dc '[:digit:].')*100/1" | $bc
+    }
+
     notifyvol () {
-      notify-send "$(wpctl get-volume @DEFAULT_SINK@)"
+      message="Volume: $(getvol)%"
+      if $wpctl get-volume @DEFAULT_SINK@ | $grep MUTED > /dev/null ; then
+        message="$message [MUTED]"
+      fi
+      notify-send "$message"
     }
 
     setvol () {
@@ -18,6 +34,28 @@ let
       notifyvol
     }
 
+    volup () {
+      if $unmute ; then
+        $wpctl set-mute @DEFAULT_SINK@ 0
+      fi
+
+      if $cap_volume && [[ $(( $(getvol) + 5 )) -gt 100 ]] ; then
+        setvol 1
+        return 
+      fi
+
+      setvol 5%+
+      # notifyvol
+    }
+
+    voldown () {
+      if $unmute ; then
+        $wpctl set-mute @DEFAULT_SINK@ 0
+      fi
+      setvol 5%-
+      # notifyvol
+    }
+
     notifybright () {
       notify-send "Brightness: $(($($brightnessctl g)*100/$($brightnessctl m)))%"
     }
@@ -27,8 +65,8 @@ let
       notifybright
     }
     case "$1" in
-      volumeup) setvol 5%+ ;;
+      volumeup) volup ;;
-      volumedown) setvol 5%- ;;
+      volumedown) voldown ;;
       mute) $wpctl set-mute @DEFAULT_SINK@ toggle; notifyvol;;
       monup) setbright 5%+;;
       mondown) setbright 5%-;;