#!/usr/bin/env perl

# Feed a newsgroup archive on stdin; produces "brain food" on stdout.
# Trained on ASR.
# - ats@offog.org, 30th July 2001

$state = 0;
$buf = "";

sub snarf { $buf .= "$_[0] "; }
sub eject {
	$_ = $buf;
	FOO: {
		if	(/^$/)		{ last FOO; }
		if	(/:\/\//)	{ last FOO; }
		if	(/@.*@/)	{ last FOO; }
		if	(/<.*@.*>/)	{ last FOO; }
		if	(length() < 20)	{ last FOO; }
		s/[^\d]//g;
		if	(length() > length($buf)/10) { last FOO; }
		print "$buf\n";
	}
	$buf = "";
}

while (<>) {
	chomp;
	s/^\s+//; s/\s+$//;
	if ($state == 0) {
		if 	(/^From /) 	{ eject(); $state = 1; next; }
		elsif 	(/^-- $/)	{ eject(); $state = 2; next; }
		elsif	(/^[->}:#|]/)	{ next; }
		elsif	(/^In article/)	{ next; }
		elsif	(/wrote in/)	{ next; }
		elsif	(/[A-Z] [A-Z] [A-Z]/) { next; }
		elsif	(/:$/)		{ eject(); next; }
		elsif	(/^$/)		{ eject(); next; }
		else			{ snarf($_); }
	} elsif ($state == 1) {
		if 	(/^$/)		{ $state = 0; next; }
	} elsif ($state == 2) {
		if 	(/^From /)	{ $state = 1; next; }
	}
}