visualizer.sh

visualizer.sh

#!/bin/bash
#=======================================================================================    
#
# Transforms cava music visualizer in a cool desktop decoration
#
# Author: Guido_Fe
#
# Dependencies (and credits): 
#   xdotool
#   cava
#   URxvt
#   devilspie
#
# Usage:
#
# To start, execute this script. To stop, execute this sctipt again.
#
# Description:
#
#   This script starts the cava music visualizer on a transparent backround through URxvt
#   ('cause it's easy to customize and support transparent foreground and background). It
#   then uses devilspie to strip it of his window decorations and rules, move it to the 
#   right place and resize it.
#   Problem: the panel doesn't allow you to focus the windows below it.
#   My solution: move cava under the screen when the mouse pointer go over
#   it, and reset its position when I move the pointer away. I accomplished this
#   behavior with xdotool.
#
#========================================================================================

#=============
# PARAMETERS TO SET
#
# Remember to don't leave spaces before and after the equal symbol

# X value of the screen resolution
Xscreen=2560

# Y value
Yscreen=1440

# Offset applied to the window's vertical position
offset=15

# Height of the cava panel
h=250

# If you want to use a different cava config, set this parameter to the respective path or
# leave '' if you don't want to change it
cavaConf=''

# Set these parameters if you want to transform a default terminal color to another one.
# This is useful if you want to have semitransparent cava bars. To do so, first set the
# cava bar colors to a default one, different to the background (white, red, green...),
# form the cava config file, and assign it's color number to the inColor variable. 
# The numbers are:
#
# black='0', red='1', green='2', yellow='3', blue='4', magenta='5', cyan='6', white='7'
#
# then set the outColor variable to the color you
# want. Examples: inColor='2' outColor='[80]#223454', where 80 is the alpha level. The
# alpha level can be '0' (fully transparent), '100' (fully opaque, or a value in between.
# For outCol you can also use normal color definitions, like '#223454'.
# As usual, leave both blank ('') if you don't want to set them.
inCol='5'
outCol='[80]#fd971f'

#=============

# Process parameters

if [ ! $cavaConf = '' ]; then
	cavaConf=" -p $cavaConf"
fi
if [ ! $inCol = '' -a ! $outCol = '' ]; then
	inCol=" --color$inCol"
	outCol=" $outCol"
else
	inCol=''
	outCol=''
fi
#Check if it's already running
if [ "$1" = 'stop' ] || [ "$1" = 'restart' ]; then
	if [ `cat /tmp/processesToKill 2> /dev/null | wc -l` -ne 0 ]; then
		#Kills the processes of the other instance and itself
		echo "Stopping..."
		kill -15 `cat /tmp/processesToKill` > /dev/null 2>&1
		rm /tmp/processesToKill
	fi
fi
if [ "$1" = 'start' ] || [ "$1" = 'restart' ]; then
	echo "Starting..."
	#The core of the program
	echo $$ >> /tmp/processesToKill
	#Write the conf file for devilspie
	echo '(and
	    (is (window_name) "cava")
	    (is (window_class) "URxvt")
	    (begin
	        (stick)
	        (below)
	        (pin)
	        (undecorate)
	        (skip_pager)
	        (skip_tasklist)
	        (wintype "desktop")
	        (geometry "'$Xscreen'x'$h'+0+'`expr $Yscreen - $h + $offset`'")
	    )
	)' > /tmp/cava.ds
	#Start urxvt and execute cava in it. Change the color white to the one chosen
	urxvt -bg "[0]red"$inCol$outCol -b 0 -depth 32 +sb -e cava$cavaConf &
	wPid=$!
	echo $wPid >> /tmp/processesToKill
	# Starts devilspie, that will move and resize the window
	devilspie /tmp/cava.ds > /dev/null &
	echo $! >> /tmp/processesToKill
fi