#!/usr/bin/perl

$dbmdir = "/home/infobot/";
$dbmpref = "infobot";

&opendbs;

if (@ARGV) {
    $query = join(" ", @ARGV);
    &respond($query);
} else {
    print "> ";
    while (<>) {
	last if /^\/?quit/i;
	chomp;
	if (/s^\/eval\s+/) {
	    $x = eval($_);
	    print $x;
	} else {
	    &respond($_);
	}
	print "> ";
    }
} 

sub opendbs {
    my $dp = "$dbmdir/$dbmpref";
    dbmopen(%is, "$dbmdir/$dbmpref-is", undef) 
	|| die "can't open $dbmdir/$dbmpref-is -- please set path";
    dbmopen(%are, "$dbmdir/$dbmpref-are", undef) 
	|| die "can't open $dbmdir/$dbmpref-are";
}

sub checkdbs {
    my @reply;
    foreach $k (@_) {
	push @reply, $is{$k}  if  $is{$k};
	push @reply, $are{$k} if $are{$k};
    }
    return @reply;
}

sub respond {
    my $query = $_[0];
    my @r;

    $query =~ tr/A-Z/a-z/;
    $query =~ s/wh\S+\s+(is|are)\s+//;
    $query =~ s/\s*\?\s*$//;

    if ($query =~ /\s+(are|is)\s+/i) {
	$lhs = $`; $verb = $1; $rhs = $';
	chomp $rhs;
	$$verb{$lhs} = $rhs;
    } else {
	if (@r = &checkdbs($query)) {
	    foreach (@r) {
		chomp;
		print "$_\n";
	    }
	} else {
	    print "undefined: $query\n";
	}
    }
}

sub dump {
    foreach (keys %is) {
	print "$_ => $is{$_}\n";
    }
}