modules/smartlinebreakconverter/smartlinebreakconverter.module

<?php

function smartlinebreakconverter_filter($op, $delta = 0, $format = -1, $text = '') {
  switch ($op) {
    case 'list':
      return array(0 => t('Smart Line Break Converter'));
      
    case 'description':
      return t('Conditionally applies the core line break filter according to need.');
    
    case 'process':
      return _smartlinebreakconverter_process($text);
    
    default:
      return $text;
  }
}

function _smartlinebreakconverter_process($text) {
  if (stristr($text, '<br>') || stristr($text, '<br />') || stristr($text, '<p>') || stristr($text, '</p>')) {
    // It appears that the content is handling line breaks on its own.
    return $text;
  }

  // The content needs line breaks processing from the core filter module.
  return filter_filter('process', 2, NULL, $text);
}
1	<?php
2
3	function smartlinebreakconverter_filter($op, $delta = 0, $format = -1, $text = '') {
4	switch ($op) {
5	case 'list':
6	return array(0 => t('Smart Line Break Converter'));
7
8	case 'description':
9	return t('Conditionally applies the core line break filter according to need.');
10
11	case 'process':
12	return _smartlinebreakconverter_process($text);
13
14	default:
15	return $text;
16	}
17	}
18
19	function _smartlinebreakconverter_process($text) {
20	if (stristr($text, '<br>') \|\| stristr($text, '<br />') \|\| stristr($text, '<p>') \|\| stristr($text, '</p>')) {
21	// It appears that the content is handling line breaks on its own.
22	return $text;
23	}
24
25	// The content needs line breaks processing from the core filter module.
26	return filter_filter('process', 2, NULL, $text);
27	}