volumeControl.sh is now POSIX compliant with /bin/sh on its shebang

i3/.config/i3/scripts/volumeControl.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # You can call this script like this:
 # $ ./volumeControl.sh up
@@ -10,54 +10,57 @@
 # https://github.com/dastorm/volume-notification-dunst/blob/master/volume.sh
 # https://gist.github.com/sebastiencs/5d7227f388d93374cebdf72e783fbd6a
 
-function get_volume {
+get_volume() {
   amixer get Master | grep '%' | head -n 1 | cut -d '[' -f 2 | cut -d '%' -f 1
 }
 
-function is_mute {
+is_mute() {
   amixer get Master | grep '%' | grep -oE '[^ ]+$' | grep off > /dev/null
 }
 
-function is_mic_mute {
+is_mic_mute() {
   amixer get Capture | grep '%' | grep -oE '[^ ]+$' | grep off > /dev/null
 }
 
-function draw_bar {
+draw_bar() {
   percentual=$1
   slices=$2
   lvl=$((percentual / slices))
-  empty=$(((100 / slices) - lvl))
+  empty_lvl=$(((100 / slices) - lvl))
+  n=0
   lvl_bar=""
-  for X in $(seq "$lvl"); do
-    lvl_bar="$lvl_bar$(printf '\u2588')"
+  while [ $n -lt $lvl ]; do
+    lvl_bar="$lvl_bar"█
+    n=$((n + 1))
   done
-  empty_bar=""
-  for X in $(seq "$empty"); do
-    empty_bar="$empty_bar$(printf '\u2591')"
+  n=0
+  while [ $n -lt $empty_lvl ]; do
+    lvl_bar="$lvl_bar"░
+    n=$((n + 1))
   done
-  echo "$lvl_bar$empty_bar"
+  printf "%s" "$lvl_bar"
 }
 
-function send_notification {
-  if [ $1 == "audio" ] ; then
+send_notification() {
+  if [ "$1" = "audio" ] ; then
     replace_id=2593
     if is_mute ; then
       notif_icon="audio-volume-muted-dark"
       notif_text="Audio Muted"
     else
       volume=$(get_volume)
-      if [ $volume -le 0 ] ; then
+      if [ "$volume" -le 0 ] ; then
         notif_icon="audio-volume-none-dark"
-      elif [ $volume -le 30 ] ; then
+      elif [ "$volume" -le 30 ] ; then
         notif_icon="audio-volume-low-dark"
-      elif [ $volume -le 85 ] ; then
+      elif [ "$volume" -le 85 ] ; then
         notif_icon="audio-volume-medium-dark"
-      elif [ $volume -le 100 ] ; then
+      elif [ "$volume" -le 100 ] ; then
         notif_icon="audio-volume-high-dark"
       else
         notif_icon="audio-volume-overamplified-dark"
       fi
-      notif_text="$(draw_bar $volume 5)"
+      notif_text="$(draw_bar "$volume" 5)"
     fi
   else
     replace_id=2594
@@ -76,8 +79,8 @@ function send_notification {
 case $1 in
   up)
     # set the volume on (if it was muted)
+    # and then up/down the volume of the 5%
     amixer -D pulse set Master on > /dev/null
-    # up the volume (+ 5%)
     amixer -D pulse sset Master 5%+ > /dev/null
     send_notification audio
     ;;