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#!/usr/bin/env perl
use strict;
use warnings;
use 5.010;
use JSON;
open my $i3status, '-|', 'i3status';
print scalar(<$i3status>);
print scalar(<$i3status>);
while (<$i3status>) {
my $comma = s/^,//;
my $line = decode_json($_);
for my $item (@$line) {
next unless $item->{name} eq 'wireless' || $item->{name} eq 'ethernet';
my $iface = $item->{instance};
my ($up, $down) = map { human_bytes(net_rate($iface, $_)) } 'rx', 'tx';
$item->{full_text} =~ s{^($iface:)}{sprintf("%s %6s/%6s", $1, $up, $down)}e;
}
unshift @$line, { name => 'title', full_text => get_title() };
say(($comma ? ',' : ''), encode_json($line));
}
print <$i3status>;
sub get_title {
my $node = find(decode_json(`i3-msg -t get_tree`));
if ($node->{window}) {
return $node->{name};
}
else {
return '-none-';
}
}
sub find {
my ($t) = @_;
if ($t->{focused}) {
return $t;
}
for my $subtree (@{ $t->{nodes} }) {
my $found = find($subtree);
return $found if $found;
}
return;
}
{
my %last_bytes;
sub net_rate {
my ($iface, $which) = @_;
my $stat_file = "/sys/class/net/$iface/statistics/${which}_bytes";
chomp(my $bytes = slurp($stat_file));
my $prev = $last_bytes{$iface}{$which};
$last_bytes{$iface}{$which} = $bytes;
return 0 unless defined $prev;
return $bytes - $prev;
}
}
sub human_bytes {
my ($bytes) = @_;
my @prefixes = ('', qw(k M G T));
my $prefix_index = 0;
while ($bytes > 512) {
$bytes /= 1024;
$prefix_index++;
}
my $prec = ($prefix_index == 0 ? 0 : 1);
return sprintf("%0.${prec}f%sB", $bytes, $prefixes[$prefix_index]);
}
sub slurp {
open my $fh, '<', $_[0] or die "Couldn't open $_[0]: $!";
if (wantarray) {
<$fh>
}
else {
local $/;
<$fh>
}
}
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