GetOptions(\%opt,
'color|c!',
'C' => sub { $opt{color} = 0 },
- 'field|f=s',
+ 'field|f=s' => sub {
+ $opt{anchor} = /^[0-9]+$/ ? qr/(?:\S*\h+){$_}\K/ : $_ for $_[1];
+ },
'human-readable|H!',
'interval|t:i',
'trim|length|l=s' => sub {
$opt{color} //= -t *STDOUT; # enable on tty
$opt{trim} *= $opt{width} / 100 if $opt{trimpct};
$opt{units} = $opt{'human-readable'} && ['', qw( k M G T P E Z Y y z a f p n μ m )];
+$opt{anchor} //= qr/\A/;
if (defined $opt{interval}) {
$opt{interval} ||= 1;
$SIG{INT} = 'IGNORE'; # continue after assumed eof
my (@lines, @values);
-my $anchor = !defined $opt{field} ? qr/\A/ :
- $opt{field} =~ /^[0-9]+$/ ? qr/(?:\S*\h+){$opt{field}}\K/ :
- $opt{field};
-my $valmatch = qr/$anchor ( \h* -? [0-9]* \.? [0-9]+ |)/x;
+my $valmatch = qr/$opt{anchor} ( \h* -? [0-9]* \.? [0-9]+ |)/x;
while (readline) {
s/\r?\n\z//;
s/^\h*// unless $opt{unmodified};