#!/usr/bin/env perl

use strict;
use warnings;

my $file = $ARGV[0];
open(ERRORS,"<$file") ||
    die("unable to open error file $file for reading");
my $in_list = 0;
my $queued_sub = '';
print "\n";
while (<ERRORS>)
{
    s/[\012\015]*$//;
    my ($indent, $data) = (/^(\s*)(.*)$/);
    $indent = length($indent);
    if ($data eq '')
    {
    }
    elsif ($indent == 0)
    {
	if ($queued_sub)
	{
	    print $queued_sub;
	    $queued_sub = '';
	}
	print "=back\n\n" if ($in_list);
        print "=head2 $data\n\n";
        $in_list = 0;
    }
    elsif ($indent == 2 && $data =~ /^http/)
    {
        print " See also $data\n\n";
    }
    elsif ($indent == 2)
    {
        print "$data\n\n";
    }
    elsif ($indent == 4 &&
           $data =~ /^([^ ]+) ([^ ]+)$/)
    {
	if ($queued_sub)
	{
	    print $queued_sub;
	    $queued_sub = '';
	}
	if (!$in_list)
	{
	    print "=over 4\n\n";
	    $in_list = 1;
	}
        my $symbol = $1;
        my $code = $2;
        print "=item $symbol\n\n";
	$queued_sub = "=cut\n\nsub $symbol { ".
	    (($code =~ /^\d+$/)?'-':'').
	    "$code }\n\n";
    }
    elsif ($indent == 6)
    {
	print "Z<>" if ($data =~ /^=/);
	print "$data\n\n";
    }
    else
    {
        die("$indent: $data");
    }
}
print $queued_sub if ($queued_sub);
print "=back\n\n=cut\n\n" if ($in_list);