i3-config-and-scripts/i3-volume-toggle

#!/bin/bash

#This script increases/decreases/toggles the volume by a fixed increment specified in step.
#This script relies on the script notify-send-improved and on pactl.

# i3-volume-toggle - Increases and decreases volume.
# Copyright (C) 2017 Fabrizio Romano Genovese <egonigredo@gmail.com>

# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.

# You should have received a copy of the
# GNU General Public License along with this program; if not, 
# see <http://www.gnu.org/licenses/>

# Put this file in /bin/ or in /usr/bin. Do not forget to give 
# sudo chmod +x i3-volume-toggle
# to make it executable.

step=5

# Check if pactl, amixer  and notify-send-improved are installed
check_installed()
{
if [ ! -f /bin/notify-send-improved -a -f /bin/pactl -a -f /bin/amixer ]; then
        echo "Notify-send-improved, amixer  and/or pactl not present."
        echo "Please install them."     
        exit 2
fi
}


#Here we actually change the volume using pactl
if [[ $# -le 1 ]]; then
	 case $1 in
               -v | --version)
                        echo "$0 - Version $version"
                        exit 0
                        ;;
                -h | --help)
                        echo "- v, --version            Display current version"
                        echo "-h, --help                Display this message"
                        echo "up                        Increase volume by $step%"
                        echo "down                      Decrease volume by $step%"
                        echo "mute			Mute/unmute"
			exit 0
                        ;;

		"up")
			check_installed
			pactl set-sink-volume  1 +$step%
			#This produces sound feedback. Comment if you don't like it.
			(speaker-test -t sine -f 400)& pid=$!; sleep 0.1s; kill -9 $pid
			;;
		"down")
			check_installed
			pactl set-sink-volume 1 -$step%
			#This produces sound feedback. Comment if you don't like it.
			(speaker-test -t sine -f 400)& pid=$!; sleep 0.1s; kill -9 $pid
			;;
		"toggle")
			check_installed
			pactl set-sink-mute 1 toggle
                        #This produces sound feedback. Comment if you don't like it.
                        (speaker-test -t sine -f 400)& pid=$!; sleep 0.1s; kill -9 $pid
			;;
		*)
                	echo "Usage: $0 {-v, --version|-h, --help|up|toggle|down}"
                	exit 2
	esac
fi

# Here we get the current status of audio from alsamixer

muted=`amixer get Master|tail -n1|sed -E 's/.*\[([a-z]+)\]/\1/'`
volume=`amixer get Master|tail -n1|sed -E 's/.*\[([0-9]+)\%\].*/\1/'`

# Selects the right icon for the notification
# If icons do not exist they won't be displayed

muteicon="/usr/share/icons/Adwaita/32x32/status/audio-volume-muted-symbolic.symbolic.png"
if [ "$volume" -eq "0" ]; then
	volumeicon=$muteicon
elif [ "$volume" -lt "33" ]; then
	volumeicon="/usr/share/icons/Adwaita/32x32/status/audio-volume-low-symbolic.symbolic.png"
elif [ "$volume" -lt "66" ]; then
	volumeicon="/usr/share/icons/Adwaita/32x32/status/audio-volume-medium-symbolic.symbolic.png"
elif [ "$volume" -lt "120" ]; then
	volumeicon="/usr/share/icons/Adwaita/32x32/status/audio-volume-high-symbolic.symbolic.png"
else

# The following image is obtained with this command:
# sudo convert "/usr/share/icons/Adwaita/32x32/status/audio-volume-high-symbolic.symbolic.png" -fuzz 100% -fill red -opaque "/usr/share/icons/Adwaita/32x32/status/audio-volume-danger-symbolic.symbolic.png"

	volumeicon="/usr/share/icons/Adwaita/32x32/status/audio-volume-danger-symbolic.symbolic.png"
fi

# Here we read the notification id from a temporary file. If the file doesn't exist, we initialize it the notification to 0
# Then we send the notification out and we reassign the notification id to the current one using tee
#
# If the file exists, we just replace that notification id, that will then stay the same and not increment.

if [ ! -f "/tmp/volume_notification_id.dat" ]; then
		notification_id="0"
		if [[ $muted == "off" ]]; then
        		notification_id=$(notify-send-improved "Volume Control" -i $muteicon --print-id -t 1000 "Muted \($volume\%\)" | tee /dev/tty)
                else
                        notification_id=$(notify-send-improved "Volume Control" -i $volumeicon --print-id -t 1000 "Volume: $volume\%" | tee /dev/tty)
                fi

else
		notification_id=`cat /tmp/volume_notification_id.dat`
                if [[ $muted == "off" ]]; then
	                notify-send-improved "Volume Control" -i $muteicon --print-id --replace=$notification_id -t 1000 "Muted \($volume\%\)"
       		else
                	notify-send-improved "Volume Control" -i $volumeicon --print-id --replace=$notification_id -t 1000 "Volume: $volume\%"
        	fi

fi


# Here we write the notification id to a file. Next time we use this script it will know if the notification has to be overwritten or not

echo "${notification_id}" > /tmp/volume_notification_id.dat