#!/usr/bin/perl -w
use strict; 

use MIME::Parser; 
use MIME::Entity; 

my $parser = new MIME::Parser; 
   $parser->output_to_core(1); 

#so here's our test MIME thingy:

my $test = MIME::Entity->build(Type     => "multipart/alternative",
						      From     => 'me@myhost.com',
						      To       => 'you@yourhost.com',
						      Subject  => "Test Test Test");

$test->attach(Type => "text/plain", 
			 Data => "This is the plain text stuff"
			 );
			 
$test->attach(Type => "text/html", 
			 Data => "<h1>This is the HTML stuff</h1>"
			 );
			 
			 
# Let's print the, "Before"
print $test->as_string();
$test = tweak_plain_text($test); 

print "\n\nAnd After...\n\n\n";

print $test->as_string();


sub tweak_plain_text { 

	my $entity = shift; 
	my @parts  = $entity->parts; 
	
	if(@parts){
		my $i; 
		foreach $i (0 .. $#parts) {
			$parts[$i]= tweak_plain_text($parts[$i]);	
		}
		$entity->sync_headers('Length'      =>  'COMPUTE',
							  'Nonstandard' =>  'ERASE');
	}else{ 
		if($entity->head->mime_type eq 'text/plain'){ 
			my $body = $entity->bodyhandle;
			my $content = $body->as_string;
			   $content .= "\nThis has been tweaked!!!!\n";
		       my $io = $body->open('w');
				  $io->print( $content );
				  $io->close;
			$entity->sync_headers('Length'      =>  'COMPUTE',
								  'Nonstandard' =>  'ERASE');
		}
		return $entity; 
	}
	
	my $content = $entity->as_string; 
	
	return $entity; 
}