Fixed wifi block, wrote own CPU usage script

Closes #40. Also added file listing USB OS's and made change-sink handle
both DAC names.

configs/i3blocks-scripts/cpu_usage

@@ -1,60 +1,8 @@
-#!/usr/bin/perl
-#
-# Copyright 2014 Pierre Mavro <deimos@deimos.fr>
-# Copyright 2014 Vivien Didelot <vivien@didelot.org>
-# Copyright 2014 Andreas Guldstrand <andreas.guldstrand@gmail.com>
-#
-# Licensed under the terms of the GNU GPL v3, or any later version.
+#!/bin/bash
 
-use strict;
-use warnings;
-use utf8;
-use Getopt::Long;
-# use Env::Modify qw(:ksh source);
+. "/home/kevin/.cache/wal/colors.sh"
 
-# default values
-my $t_warn = 50;
-my $t_crit = 80;
-my $cpu_usage = -1;
-
-sub help {
-    print "Usage: cpu_usage [-w <warning>] [-c <critical>]\n";
-    print "-w <percent>: warning threshold to become yellow\n";
-    print "-c <percent>: critical threshold to become red\n";
-    exit 0;
-}
-
-GetOptions("help|h" => \&help,
-           "w=i"    => \$t_warn,
-           "c=i"    => \$t_crit);
-
-# Get CPU usage
-$ENV{LC_ALL}="en_US"; # if mpstat is not run under en_US locale, things may break, so make sure it is
-open (MPSTAT, 'mpstat 1 1 -P ALL |') or die;
-while (<MPSTAT>) {
-    if (/^.*\s+(\d+\.\d+)\s+$/) {
-        $cpu_usage = 100 - $1; # 100% - %idle
-        last;
-    }
-}
-close(MPSTAT);
-
-$cpu_usage eq -1 and die 'Can\'t find CPU information';
-
-# Print short_text, full_text
-printf "%.0f%%\n", $cpu_usage;
-printf "%.0f%%\n", $cpu_usage;
-
-system("source \"/home/kevin/.cache/wal/colors.sh\"");
-# printf "%s", $ENV{'SHELL'};
-printf "%s", $ENV{'color2'};
-# printf "%s", $ENV{'bg'};
-# Print color, if needed
-if ($cpu_usage >= $t_crit) {
-    print "#FF0000\n";
-    exit 33;
-} elsif ($cpu_usage >= $t_warn) {
-    print "#FFFC00\n";
-}
-
-exit 0;
+idle="$(mpstat 1 1 -P ALL | sed -n -e '4{p;q}' | awk '{print $NF}')"
+used=$(echo 100 - "$idle" | bc)
+used_rounded=$(printf %.0f "$used")
+printf "%s%%\n\n%s\n" "$used_rounded" "$color7"