use List::Util qw( min max sum );
use open qw( :std :utf8 );
-our $VERSION = '1.00';
+our $VERSION = '1.02';
use Getopt::Long '2.33', qw( :config gnu_getopt );
sub podexit { require Pod::Usage; Pod::Usage::pod2usage(-exitval => 0, @_) }
GetOptions(\my %opt,
'color|c!',
+ 'follow|f:i',
'trim|length|l=i',
'markers|m=s',
'width|w=i',
'usage|h' => sub { podexit() },
'help' => sub { podexit(-verbose => 2) },
) or exit 64; # EX_USAGE
+
$opt{width} ||= $ENV{COLUMNS} || 80;
-$opt{color} //= 1;
-$opt{trim} //= 0;
+$opt{color} //= -t *STDOUT; # enable on tty
+
+if (defined $opt{follow}) {
+ $opt{follow} ||= 1;
+ $SIG{ALRM} = sub {
+ show_lines();
+ alarm $opt{follow};
+ };
+ alarm $opt{follow};
+}
-my @lines = readline or exit;
-chomp for @lines;
-my @values = map { s/^\h* ( -? [0-9]* (?:\.[0-9]+)? )//x and $1 } @lines;
-my @order = sort { $b <=> $a } grep { length } @values;
-length > $opt{trim} + 1 and substr($_, $opt{trim}) = '…' for @lines;
+my (@lines, @values);
+while (readline) {
+ chomp;
+ push @values, s/^\h* ( -? [0-9]* (?:\.[0-9]+)? )//x && $1;
+ if (defined $opt{trim}) {
+ my $trimpos = abs $opt{trim};
+ if ($trimpos <= 1) {
+ $_ = substr $_, 0, 1;
+ }
+ elsif (length > $trimpos) {
+ substr($_, $trimpos - 1) = '…';
+ }
+ }
+ push @lines, $_;
+}
+@lines or exit;
+sub show_lines {
+
+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 $len = $opt{trim} ? $opt{trim} + 2 :
+my $len = defined $opt{trim} && $opt{trim} <= 0 ? -$opt{trim} + 1 :
1 + max map { length } @lines; # left padding
my $size = ($maxval - $minval) &&
($opt{width} - $lenval - $len) / ($maxval - $minval); # bar multiplication
my @barmark;
-if ($opt{markers} // 1) {
- sub orderpos { (($order[$_[0]] + $order[$_[0] + .5]) / 2 - $minval) * $size }
+if ($opt{markers} // 1 and $size > 0) {
+ my sub orderpos { (($order[$_[0]] + $order[$_[0] + .5]) / 2 - $minval) * $size }
$barmark[ (sum(@order) / @order - $minval) * $size ] = '='; # average
+ $barmark[ orderpos($#order * .31731) ] = '>';
+ $barmark[ orderpos($#order * .68269) ] = '<';
$barmark[ orderpos($#order / 2) ] = '+'; # mean
$barmark[ -$minval * $size ] = '|' if $minval < 0; # zero
defined and $opt{color} and $_ = "\e[36m$_\e[0m" for @barmark;
}
-for my $nr (0 .. $#lines) {
+state $nr = 0;
+while ($nr <= $#lines) {
my $val = $values[$nr];
if (length $val) {
my $color = !$opt{color} ? 0 :
print "\e[0m" if $color;
}
printf '%-*s', $len, $lines[$nr];
- print $barmark[$_] // '-' for 1 .. (($val || 0) - $minval) * $size;
+ print $barmark[$_] // '-' for 1 .. $size && (($val || 0) - $minval) * $size;
say '';
+ $nr++;
+}
+
}
+show_lines();
__END__
=over
-=item --no-color
+=item -c, --[no-]color
-Disable colored output of values and bar markers.
+Force colored output of values and bar markers.
+Defaults on if output is a tty,
+disabled otherwise such as when piped or redirected.
-=item -l, --length=<size>
+=item -f, --follow[=<seconds>]
+
+Interval to output partial progress.
+
+=item -l, --length=[-]<size>
Trim line contents (between number and bars)
to a maximum number of characters.
-The exceeding part is replaced by an abbreviation sign.
+The exceeding part is replaced by an abbreviation sign,
+unless C<--length=0>.
+
+Prepend a dash (i.e. make negative) to enforce padding
+regardless of encountered contents.
=item -m, --markers=
=item B<+>
-Median:
+Mean, median:
the middle value or average between middle values.
+=item B<<>
+
+Standard deviation left of the mean.
+Only 16% of all values are lower.
+
+=item B<< > >>
+
+Standard deviation right of the mean.
+The part between B<< <--> >> encompass all I<normal> results,
+or 68% of all entries.
+
=back
=item -w, --width=<columns>
git shortlog -sn | graph | head -3
+Latency history:
+
+ ping google.com |
+ perl -pe '$|=1; print s/ time=(.*)// ? "$1 for " : "> "' | graph -f
+
=head1 AUTHOR
Mischa POSLAWSKY <perl@shiar.org>