Along the lines of
Juerd's code, but with implicit recursion and much less array index math (which I hate with a passion):
sub menu {
my ($title, @option) = @{ shift };
my (@name, @action);
($name[@name], $action[@action]) = splice @option, 0, 2
while @option;
while(1) {
print "\n$title\n";
print map "$_. $name[$_ - 1]\n", 1 .. @name;
print '> ';
chomp (my $choice = readline *STDIN);
if ($choice and $choice > 0 and $choice <= @action) {
my $do_action = $action[$choice];
return unless defined $do_action;
$do_action->() if 'CODE' eq ref $action;
$menu($action) if 'ARRAY' eq ref $action;
require Carp;
Carp::croak "I don't know what to do with $action";
} else {
print "Invalid choice: $choice\n"
}
}
}
Now you can still very similarly say
#!/usr/bin/perl -w
use strict;
sub foo { print "FOO!\n" }
sub bar { print "BAR!\n" }
sub menu { ... }
my ($mainmenu, $submenu);
$submenu = [
'Submenu',
'Bar', => \&bar,
'Back to previous menu' => undef,
];
$mainmenu = [
'Main menu',
'Foo' => \&foo,
'Submenu...' => $submenu,
'Exit' => undef,
];
menu($mainmenu);
but you can also much more concisely say
menu([
'Main menu',
'Foo' => \&foo,
'Submenu...' => [
'Submenu',
'Bar', => \&bar,
'Back to previous menu' => undef,
],
'Exit' => undef,
]);
Makeshifts last the longest.
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