feat: optimized set-{vol,light}

bin/set-vol

@@ -1,37 +1,21 @@
-#!/bin/bash
-set -e
+#!/bin/bash -e
 
 SINK='@DEFAULT_AUDIO_SINK@'
 
 if [ "$1" == 'm' ]; then
     wpctl set-mute "$SINK" toggle
 else
-    VOL="$((10#$(wpctl get-volume "$SINK" | tr -dc '0-9')))"
-    [ -n "$1" ] && VOL="$((VOL - VOL % $1))"
+    CUR="$((10#$(wpctl get-volume "$SINK" | tr -dc '0-9')))"
 
     case "${1:0:1}" in
-        '')
-            echo "$VOL"
-            exit
-            ;;
-        '+'|'-')
-            VOL="$((VOL + $1))"
-            ;;
-        *)
-            VOL="$1"
-            ;;
+        '')      echo "$CUR"; exit              ;;
+        '+'|'-') CUR="$((CUR - CUR % $1 + $1))" ;;
+        *)       CUR="$1"                       ;;
     esac
 
-    [ "$VOL" -lt 0   ] && VOL=0
-    [ "$VOL" -gt 100 ] && VOL=100
-
-    wpctl set-volume "$SINK" "$VOL%"
-    wpctl set-mute   "$SINK" 0
+    wpctl set-volume -l 1 "$SINK" "$CUR%"
+    wpctl set-mute        "$SINK" 0
 fi
 
 # update sbar
 kill -34 "$(cat "$HOME/.cache/pidofbar")"
-
-if [ -t 1 ]; then
-    echo "$VOL"
-fi