feat: limit set-vol logs to tty

bin/set-light

@@ -40,4 +40,7 @@ for dev in /sys/class/backlight/*; do
 done
 
 echo "$NEW" > "$CUR_FILE"
-echo "$NEW"
+
+if [ -t 1 ]; then
+    echo "$NEW"
+fi

bin/set-vol

@@ -44,4 +44,6 @@ esac
 $CMD "$SINK" "$VOL%" > /dev/null
 pactl set-sink-mute "$PACTL_SINK" 0
 
-echo "$VOL"
+if [ -t 1 ]; then
+    echo "$VOL"
+fi