Based on your code, but made recursive, and with less array references:
#!/usr/bin/perl -w
use strict;
sub foo { print "FOO!\n" }
sub bar { print "BAR!\n" }
sub menu {
my ($menu) = @_;
for (;;) {
print "\n$menu->[0]\n";
print map "$_. $menu->[$_ * 2 - 1]\n", 1 .. $#$menu / 2;
print '> ';
chomp (my $choice = readline *STDIN);
if ($choice and $choice <= $#$menu / 2) {
my $action = \$menu->[$choice * 2];
return if not defined $action;
$action->() if ref $action eq 'CODE';
menu $action if ref $action eq 'ARRAY'
} else {
print "Invalid choice: $choice\n"
}
}
}
my ($mainmenu, $submenu);
$mainmenu = [
'Main menu',
'Foo' => \&foo,
'Submenu...' => sub { menu $submenu },
'Exit' => undef,
];
$submenu = [
'Submenu',
'Bar', => \&bar,
'Back to previous menu' => undef,
];
menu $mainmenu;
Update
Aristotle++ has a very good point with the arrayref used as action, so I used
Acme::Magpie to steal it :)
menu [
'Main menu',
'Foo' => \&foo,
'Submenu...' => [
'Submenu',
'Bar', => \&bar,
'Back to previous menu' => undef,
],
'Exit' => undef,
];
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