#!/usr/bin/env perl
use 5.014;
use warnings;
-use List::Util qw( max sum );
+use utf8;
+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';
+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} //= -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, @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;
-my @lines = readline or exit;
-chomp for @lines;
-my @values = map { s/^\h*([0-9]*)// and $1 } @lines;
-my @order = sort { $b <=> $a } @values;
-my $lenval = 1 + int log($order[0]) / log 10; # max string length
-my $len = 1 + max map { length } @lines; # left padding
-my $size = ($opt{width} - $lenval - $len) / $order[0]; # bar multiplication
+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 = 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 - $minval); # bar multiplication
-sub orderpos { ($order[$_[0]] + $order[$_[0] + .5]) / 2 * $size }
my @barmark;
-$barmark[ sum(@values) / @values * $size ] = '='; # average
-$barmark[ orderpos($#order / 2) ] = '+'; # mean
-defined and $_ = "\e[36m$_\e[0m" for @barmark;
+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];
- my $color =
- $val == $order[0] ? 32 : # max
- $val == $order[-1] ? 31 : # min
- 90;
- printf "\e[%sm", $color if $color;
- printf "%*s", $lenval, $val;
- print "\e[0m" if $color;
+ if (length $val) {
+ my $color = !$opt{color} ? 0 :
+ $val == $order[0] ? 32 : # max
+ $val == $order[-1] ? 31 : # min
+ 90;
+ printf "\e[%sm", $color if $color;
+ printf "%*s", $lenval, $val;
+ print "\e[0m" if $color;
+ }
printf '%-*s', $len, $lines[$nr];
- print $barmark[$_] // '-' for 1 .. $val * $size;
+ print $barmark[$_] // '-' for 1 .. $size && (($val || 0) - $minval) * $size;
say '';
+ $nr++;
}
+}
+show_lines();
+
__END__
=head1 NAME
B<graph> [<options>] [<input>]
-cat ... | uniq -c | graph
-
=head1 DESCRIPTION
Each line starting with a number is given a bar to visualise relative sizes.
=over
+=item -c, --[no-]color
+
+Force colored output of values and bar markers.
+Defaults on if output is a tty,
+disabled otherwise such as when piped or redirected.
+
+=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,
+unless C<--length=0>.
+
+Prepend a dash (i.e. make negative) to enforce padding
+regardless of encountered contents.
+
+=item -m, --markers=
+
+Statistical positions to indicate on bars.
+Cannot be customized yet,
+only disabled by providing an empty argument.
+
+Any value enables all marker characters:
+
+=over 2
+
+=item B<=>
+
+Average:
+the sum of all values divided by the number of counted lines.
+
+=item B<+>
+
+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>
Override the maximum number of columns to use.
=back
+=head1 EXAMPLES
+
+Commonly used after counting, such as users on the current server:
+
+ users | sed 's/ /\n/g' | sort | uniq -c | graph
+
+Letter frequencies in text files:
+
+ cat /usr/share/games/fortunes/*.u8 |
+ perl -CO -nE 'say for grep length, split /\PL*/, uc' |
+ sort | uniq -c | graph
+
+Memory usage of user processes:
+
+ ps xo %mem,pid,cmd | graph -l40
+
+Sizes (in megabytes) of all root files and directories:
+
+ du -d0 -m * | graph
+
+Number of HTTP requests per day:
+
+ cat log/access.log | cut -d\ -f4 | cut -d: -f1 | uniq -c | graph
+
+Any kind of database query with leading counts:
+
+ echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
+ psql -t | graph
+
+Git statistics, such commit count by year:
+
+ git log --pretty=%ci | cut -b-4 | uniq -c | graph
+
+Or the most frequent authors:
+
+ 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>