#!/usr/bin/perl

# Usage: travesty [files]

# First analyze the input.

while (<>) {

    # Handle article headers and ">>>" quotes.

    next if /^\./;
    next if /^From / .. /^$/;
    next if /^Path: / .. /^$/;
    s/^\W+//;

    # Do each word.

    push(@ary,split(' '));
    while ($#ary > 1) {
	$a = $p;
	$p = $n;
	$w = shift(@ary);
	$n = $num{$w};
	if ($n eq '') {
	    push(@word,$w);
	    $n = pack('S',$#word);
	    $num{$w} = $n;
	}
	$lookup{$a . $p} .= $n;
    }
}

# Now spew out the words, based on the frequencies.  If there
# is more than one possibility to choose from, choose one
# randomly.

for ($i=0;$i<100;$i++) {
    $n = $lookup{$a . $p};
    ($foo,$n) = each(lookup) if $n eq '';       # A bootstrap.
    $n = substr($n,int(rand(length($n))) & 0177776,2);
    $a = $p;
    $p = $n;
    ($w) = unpack('S',$n);
    $w = $word[$w];

    # See if word fits on line.

    $col += length($w) + 1;
    if ($col >= 65) {
	$col = 0;
	print "\n";
    }
    else {
	print ' ';
    }
    print $w;

    # Paragraph every 10 sentences or so.

    if ($w =~ /\.$/) {
	if (rand() < .1) {
	    print "\n";
	    $col = 80;
	}
    }
}
