GetOptions(\%opt,
'color|c!',
'C' => sub { $opt{color} = 0 },
- 'field|f=i',
+ 'field|f=s',
'interval|t:i',
'trim|length|l=s' => sub {
my ($optname, $optval) = @_;
);
$opt{trim} = $optval;
},
+ 'value-length=i',
'markers|m=s',
'unmodified|u!',
'width|w=i',
$SIG{INT} = 'IGNORE'; # continue after assumed eof
my (@lines, @values);
-my $anchor = $opt{field} ? qr/(?:\S*\h+){$opt{field}}\K/ : qr/^/;
+my $anchor = !defined $opt{field} ? qr/\A/ :
+ $opt{field} =~ /^[0-9]+$/ ? qr/(?:\S*\h+){$opt{field}}\K/ :
+ $opt{field};
while (readline) {
s/\r?\n\z//;
s/^\h*// unless $opt{unmodified};
my @order = sort { $b <=> $a } grep { length } @values;
my $maxval = $order[0];
my $minval = min $order[-1], 0;
-my $lenval = max map { length } @order;
+my $lenval = $opt{'value-length'} // max map { length } @order;
my $len = defined $opt{trim} && $opt{trim} <= 0 ? -$opt{trim} + 1 :
max map { length $values[$_] && length $lines[$_] } 0 .. $#lines; # left padding
my $size = ($maxval - $minval) &&
Defaults on if output is a tty,
disabled otherwise such as when piped or redirected.
-=item -f, --field=<number>
+=item -f, --field=(<number>|<regexp>)
+
+Compare values after a given number of whitespace separators,
+or matching a regular expression.
-Compare values after a given number of whitespace separators.
Unspecified or I<-f0> means values are at the start of each line.
With I<-f1> the second word is taken instead.
+A string can indicate the starting position of a value
+(such as I<-f:> if preceded by colons),
+or capture the numbers itself,
+for example I<-f'(\d+)'> for the first digits anywhere.
=item -t, --interval[=<seconds>]
Do not strip leading whitespace.
Keep original value alignment, which may be significant in some programs.
+=item --value-length=<size>
+
+Reserved space for numbers.
+
=item -w, --width=<columns>
Override the maximum number of columns to use.
curl https://sdw.ecb.europa.eu/export.do \
-Gd 'node=SEARCHRESULTS&q=EXR.D.USD.EUR.SP00.A&exportType=csv' |
- awk -F, '{RS="\r\n"} /^[12]/{print $1,$2}' | graph -f1
+ grep '^[12]' | graph -f',\K' --value-length=7
Total population history from the World Bank dataset (XML):
Latency history:
- ping google.com |
- perl -pe '$|=1; print s/ time=(.*)// ? "$1 for " : "> "' | graph -t
+ ping google.com | graph -f'time=\K' -t
=head1 AUTHOR