#!/usr/bin/env perl
eval 'exec /usr/bin/perl  -S $0 ${1+"$@"}'
    if 0; # not running under some shell

# $Author$ Last modified: 14 Dec 2003 15:30:18
# Suggested name: "pmnodecomp-blockquoter" - shorten if wished.
# Or better yet make a symlink or alias.
use strict;
BEGIN  {
    use vars qw! $plugin !;
    $plugin =
       (eval    { # Place your own home-brewed filter module below.
	          # This is only a suggestive example / default.
	     require PMntextFilter;
           # import  PMnTextFilter "quazzle wrench bangbar";
        }) ? 'extern' : 'intern';
}

use warnings;
use vars qw! $DeBug $acq $outfm $rcnt $pictstr !,
         qw! $amps $ltgt $sqbr !;
use subs qw! bbegin bendin newblk filtermeta !;

$DeBug = 0;
use constant rCNT => 66; # arbitrary length for output lines.
format EBLK =
  </blockquote>

.
format BBLK =
  <blockquote>
.
format NBLK =
  <br><br>
.

if    ($plugin eq 'extern')
{
    $amps = sub { PMntextFilter::amps(@_) };
    $ltgt = sub { PMntextFilter::ltgt(@_) };
    $sqbr = sub { PMntextFilter::sqbr(@_) };
}
else
{
    $amps = sub
    {
	my $amper = '&amp;';
	my $para = shift;
	$para =~ s% \& %$amper%oxgm;
	return $para;
    };
    $ltgt = sub
    {
	my ($lt,$gt) = ( '&lt;','&gt;' );
	my $para = shift;
	$para =~ s% \< %$lt%oxgm;
	$para =~ s% \> %$gt%oxgm;
	print STDERR "\n$acq\n" if $DeBug;
	return $para;
    };
    $sqbr = sub
    {
	my ($sqbro,$sqbrc) =
	              ( '&#91;','&#93;' );
	my $para = shift;
	$para =~ s% \[ %$sqbro%oxgm;
	$para =~ s% \] %$sqbrc%oxgm;
	print STDERR "\n$acq\n" if $DeBug;
	return $para;
    };
}

$pictstr = q[^] . q[<] x rCNT;
$outfm = qq[format STDOUT = ]
        .qq[\n        $pictstr\n]
        . q[$acq] . qq[\n.\n];
eval $outfm;
   die "Bad perl format!: $@" if $@;
my $splurt = sub { local $/ = qq[]; $acq = <STDIN> };
my $pc = 0;
bbegin;
while (&$splurt and $pc++ < 10000)
{
    filtermeta  $acq;
    write while $acq;
    newblk unless eof(STDIN);
}
bendin;

exit 0;

sub filtermeta
{ # Do what you want to here. Given is a minimal default.
    $acq=&$amps($acq);
    $acq=&$ltgt($acq);
    $acq=&$sqbr($acq);
}
sub newblk
{
    local $~ = "NBLK";
    write;
}
sub bbegin
{
    local $~ = "BBLK";
    write;
}
sub bendin
{
    local $~ = "EBLK";
    write;
}