File Coverage

blib/lib/Term/Menu/Hierarchical.pm

Criterion	Covered	Total	%
statement	15	93	16.1
branch	0	36	0.0
condition	0	6	0.0
subroutine	5	8	62.5
pod	0	1	0.0
total	20	144	13.8

package Term::Menu::Hierarchical;
use strict;
use warnings;
use POSIX;
use Term::Cap;
use Term::ReadKey;
require Exporter;
require 5.007_001;
binmode STDOUT, ":utf8";
$|++;

our @ISA = qw(Exporter);
our @EXPORT = qw(menu);

our $VERSION = '0.95';

# Set up the terminal handling
my $ti = POSIX::Termios->new();
$ti->getattr;
my $t = Term::Cap->Tgetent({ TERM => undef, OSPEED => $ti->getospeed||38400 });
$t->Trequire(qw/ce cl/);
my($max_width, $max_height);

########################################################################################

sub menu {

	my ($all, $data) = shift;
	die "The argument must be a hashref (arbitrary depth); exiting.\n"
   		unless ref($all) eq 'HASH';

	{
		# Refresh size info to catch term resize events
		($max_width, $max_height) = GetTerminalSize "STDOUT";
		$t->Tputs("cl", 1, *STDOUT);
		if (ref($data->{content}) eq 'HASH'){
			$data = _display($data);
		}
		else {
			if (defined $data->{content}){
				_more("$data->{label}\n\n$data->{content}\n");
			}
			$data->{content} = $all;
			$data->{label}   = 'Top';
		}
		redo;
	}
}

sub _more {
	return unless my @txt = split /\n/, shift;
	# Fill @txt so we have full 'pages'
	if (@txt % ($max_height - 2)){
		push @txt, '~' for 3 .. ($max_height - @txt % ($max_height - 2));
	}
	my ($pos, @pages) = 0;
	push @pages, [ splice @txt, 0, ($max_height - 2) ] while @txt;

  	my $prompt = ' [ =page down  =back  =quit ]   ';
	{
		$t->Tputs("cl", 1, *STDOUT);
		for (@{$pages[$pos]}){
			# (Crude) long line handling. You should format your data...
			if (length($_) > $max_width){
				print substr($_, 0, $max_width - 1);
				$t->Tputs("so", 1, *STDOUT);
				print ">\n";
				$t->Tputs("se", 1, *STDOUT);
			}
			else {
				print "$_\n";
			}
		}

		$t->Tputs("so", 1, *STDOUT);
		$t->Tputs("md", 1, *STDOUT);
		print "\n", $prompt, ' ' x ($max_width - length($prompt));
		$t->Tputs("me", 1, *STDOUT);
		$t->Tputs("se", 1, *STDOUT);

		ReadMode 4;
		my $key;
		1 while not defined ($key = ReadKey(-1));
		ReadMode 0;
		if ($key =~ /q/i){
			return;
		}
		elsif ($key =~ /b/i){
			$pos-- if $pos > 0;
		}
		elsif ($key =~ /\s/){
			$pos++ if $pos < $#pages;
		}
		redo;
	}
}

sub _display {
	my $ref = shift;
	# reverse-sort the lengths of all the item names, count them...
	my $num_items = my @lengths = sort {$b<=>$a} map {length($_)} keys %{$ref->{content}};
	# ...and grab the first number in the list to get the display width.
	my $max_len = $lengths[0];
	die "Your display is too narrow for these items.\n"
		if $max_len + 7 > $max_width;

	# How many digits will we need for the index?
	my $count_width = $num_items =~ tr/0-9//;
	# '5' covers the formatting bits (separator, parens, three spaces)
	my $span_width = $max_len + $count_width + 5;
	# Max number of items that will fit in the display width *or*
	# the total number of items if it's less than that.
	my $items_per_line = int($max_width/$span_width) < $num_items ?
		int($max_width/$span_width) : $num_items;
	# Figure out total width for printing; '-1' adjusts for box corners
	my $width = $items_per_line * $span_width - 1;

	# Display the menu, get the answer, and validate it
	my($answer, %list);
	{
		my $count;
		$t->Tputs("cl", 1, *STDOUT);
		print "." . "-" x $width . ".\n";
		for my $item (keys %{$ref->{content}}){
			# Create a number-to-entry lookup table
			$list{++$count} = $item;
			# Print formatted box body
			printf "| %${count_width}s) %-${max_len}s ", $count, $item;
			print  "|\n" unless $count % $items_per_line;
		}
		# If we don't have enough items to fill the last line, pad with empty cells
		if ($count % $items_per_line){
			my $pad = "|" . " " x ($span_width - 1);
			print $pad x ($items_per_line - $count % $items_per_line);
			print "|\n";
		}
		print "'" . "-" x $width . "'\n";

		print "Item number (1-$count, 0 to restart, 'q' to quit)? ";
		chomp($answer = );
		exit if $answer =~ /^q/i;
		redo unless $answer =~ /^\d+$/ && $answer >= 0 && $answer <= $count;
	}
	my $retval;
	if ($answer == 0){
		$retval->{content} = undef;
	}
	else {
		$retval->{label} = "$ref->{label} >> $list{$answer}";
		$retval->{content} = $ref->{content}->{$list{$answer}};
	}
	return $retval;
}

########################################################################################

1;

__END__