#!/usr/local/bin/perl -w
use strict;
use Carp;
my %Commands = ('who' => \&do_who,
'what' => \&do_what,
'why' => \&do_why,
'never' => \&do_never,
'again' => \&do_again,
'answer' => \&do_answer);
{
my $userinput = $ARGV[0];
my ($errmsg, $command) = check_commands (\%Commands, $userinput);
if ($errmsg)
{
print "$errmsg\n";
exit;
}
&{$Commands {$command}};
}
sub check_commands
{
@_ == 2 or croak "Incorrect number of parameters";
my ($cmdhash, $command) = @_;
my @matches = grep /^$command/i, sort keys %$cmdhash;
if (scalar @matches == 0)
{
return ("I don't know what '$command' means", undef);
}
elsif (scalar @matches > 1)
{
my $lastcmd = pop @matches;
return ("'$command' is ambigous. It could mean " . join (', ',
+@matches) . " or $lastcmd", undef);
}
return (undef, $matches [0]);
}
sub do_who {print "Who\n"};
sub do_what {print "What\n"};
sub do_why {print "Why\n"};
sub do_never {print "Never\n"};
sub do_again {print "Again\n"};
sub do_answer {print "Answer\n"};
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