#!/usr/bin/perl -w

# Shows how to mangle all plain  text in an HTML document, using an arbitrary
# Perl expression. Plain text is all text not within a tag declaration, i.e.
# not in <p ...>, but possibly between <p> and </p>
# Example (Reverse 'Debian' in all text) :
#       lynx -dump -source -raw http://www/debian.org > /tmp/a.txt
#       ./htextsub '$_ =~ s/Debian/Naibed/gi' /tmp/a.txt

use strict;
my $code = shift || usage();
$code = 'sub edit_print { local $_ = shift; ' . $code . '; print }';
#print $code;
eval $code;
die $@ if $@;

use HTML::Parser 3.05;
my $p = HTML::Parser->new(unbroken_text => 1,
			  default_h => [ sub { print @_; }, "text" ],
                	  text_h    => [ \&edit_print,      "text" ],
        	         );

my $file = shift || usage();
$p->parse_file($file) || die "Can't open file $file: $!\n";

sub usage
{
    my $progname = $0;
    $progname =~ s,^.*/,,;
    die "Usage: $progname <perlexpr> <filename>\n";
}