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#! /usr/bin/perl
{ package My::BarChart;
use Moo;
use Function::Parameters;
use Types::Standard qw{ HashRef Num Str Enum };
use List::Util qw{ max };
sub SortBy { Enum[qw[ labels values labels_desc values_desc ]] }
use namespace::clean;
has width => (is => 'lazy', isa => Num);
has data => (is => 'ro', isa => HashRef[Num], required => 1);
has separator => (is => 'ro', isa => Str, default => ' | ');
has _bar_width => (is => 'lazy', isa => Num);
has _max_length => (is => 'lazy', isa => Num);
method generate (SortBy $sort_by = 'keys') {
my $data = $self->data;
my $max = max(values %$data);
my $sort = {labels => \&_by_key,
values => \&_by_value,
labels_desc => \&_by_key_desc,
values_desc => \&_by_value_desc}->{$sort_by};
for my $key (sort { $self->$sort } keys %$data) {
printf '%' . $self->_max_length . "s%s%s\n",
$key,
$self->separator,
'#' x ($self->_bar_width / $max * $data->{$key});
}
}
method BUILD ($) {
die "Chart is too wide.\n" if $self->_bar_width <= 0;
}
method _build_width () { $ENV{COLUMNS} || qx{tput cols} || 80 }
method _build__max_length () { max(map length, keys %{ $self->data }) }
method _build__bar_width () {
$self->width - $self->_max_length - length $self->separator
}
method _by_key () { $a cmp $b }
method _by_key_desc () { $b cmp $a }
method _by_value () { $self->data->{$a} <=> $self->data->{$b} }
method _by_value_desc () { $self->data->{$b} <=> $self->data->{$a} }
}
use warnings;
use strict;
use feature qw{ say };
my $data = { apple => 3, cherry => 2, banana => .5 };
my $chart = 'My::BarChart'->new(data => $data);
say $chart->generate('labels');
say $chart->generate('values');
say $chart->generate('values_desc');
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