friendica/include/bb2diaspora.php

<?php

require_once("include/oembed.php");
require_once("include/event.php");
require_once("library/markdown.php");
require_once("include/html2bbcode.php");
require_once("include/bbcode.php");
require_once("library/html-to-markdown/HTML_To_Markdown.php");


// we don't want to support a bbcode specific markdown interpreter
// and the markdown library we have is pretty good, but provides HTML output.
// So we'll use that to convert to HTML, then convert the HTML back to bbcode,
// and then clean up a few Diaspora specific constructs.

function diaspora2bb($s) {

	$s = html_entity_decode($s,ENT_COMPAT,'UTF-8');

	// Remove CR to avoid problems with following code
	$s = str_replace("\r","",$s);

	$s = str_replace("\n"," \n",$s);

	// The parser cannot handle paragraphs correctly
	$s = str_replace(array("</p>", "<p>", '<p dir="ltr">'),array("<br>", "<br>", "<br>"),$s);

	// Escaping the hash tags
	$s = preg_replace('/\#([^\s\#])/','&#35;$1',$s);

	$s = Markdown($s);

	$s = preg_replace('/\@\{(.+?)\; (.+?)\@(.+?)\}/','@[url=https://$3/u/$2]$1[/url]',$s);

	$s = str_replace('&#35;','#',$s);

	$search = array(" \n", "\n ");
	$replace = array("\n", "\n");
	do {
		$oldtext = $s;
		$s = str_replace($search, $replace, $s);
	} while ($oldtext != $s);

	$s = str_replace("\n\n", "<br>", $s);

	$s = html2bbcode($s);

	// protect the recycle symbol from turning into a tag, but without unescaping angles and naked ampersands
	$s = str_replace('&#x2672;',html_entity_decode('&#x2672;',ENT_QUOTES,'UTF-8'),$s);

	// Convert everything that looks like a link to a link
	$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url=$2$3]$2$3[/url]',$s);

	//$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)(vimeo|youtu|www\.youtube|soundcloud)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url=$2$3$4]$2$3$4[/url]',$s);
	$s = bb_tag_preg_replace("/\[url\=?(.*?)\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/url\]/ism",'[youtube]$2[/youtube]','url',$s);
	$s = bb_tag_preg_replace("/\[url\=https?:\/\/www.youtube.com\/watch\?v\=(.*?)\].*?\[\/url\]/ism",'[youtube]$1[/youtube]','url',$s);
	$s = bb_tag_preg_replace("/\[url\=?(.*?)\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/url\]/ism",'[vimeo]$2[/vimeo]','url',$s);
	$s = bb_tag_preg_replace("/\[url\=https?:\/\/vimeo.com\/([0-9]+)\](.*?)\[\/url\]/ism",'[vimeo]$1[/vimeo]','url',$s);
	// remove duplicate adjacent code tags
	$s = preg_replace("/(\[code\])+(.*?)(\[\/code\])+/ism","[code]$2[/code]", $s);

	// Don't show link to full picture (until it is fixed)
	$s = scale_external_images($s, false);

	return $s;
}

function bb2diaspora($Text,$preserve_nl = false, $fordiaspora = true) {

	$a = get_app();

	$OriginalText = $Text;

	// Since Diaspora is creating a summary for links, this function removes them before posting
	if ($fordiaspora)
		$Text = bb_remove_share_information($Text);

	/**
	 * Transform #tags, strip off the [url] and replace spaces with underscore
	 */
	$URLSearchString = "^\[\]";
	$Text = preg_replace_callback("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/i", create_function('$match',
		'return \'#\'. str_replace(\' \', \'_\', $match[2]);'
	), $Text);


	// Converting images with size parameters to simple images. Markdown doesn't know it.
	$Text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $Text);

	// Convert it to HTML - don't try oembed
	if ($fordiaspora) {
		$Text = bbcode($Text, $preserve_nl, false, 3);

		// Add all tags that maybe were removed
		if (preg_match_all("/#\[url\=([$URLSearchString]*)\](.*?)\[\/url\]/ism",$OriginalText, $tags)) {
			$tagline = "";
			foreach($tags[2] as $tag)
				if (!strpos($Text, "#".$tag))
					$tagline .= "#".$tag." ";

			$Text = $Text."<br />".$tagline;
		}

	} else
		$Text = bbcode($Text, $preserve_nl, false, 4);

    // mask some special HTML chars from conversation to markdown
    $Text = str_replace(array('&lt;','&gt;','&amp;'),array('&_lt_;','&_gt_;','&_amp_;'),$Text);

	// If a link is followed by a quote then there should be a newline before it
	// Maybe we should make this newline at every time before a quote.
	$Text = str_replace(array("</a><blockquote>"), array("</a><br><blockquote>"), $Text);

	$stamp1 = microtime(true);

	// Now convert HTML to Markdown
	$Text = new HTML_To_Markdown($Text);

    // unmask the special chars back to HTML
    $Text = str_replace(array('&_lt_;','&_gt_;','&_amp_;'),array('&lt;','&gt;','&amp;'),$Text);

	$a->save_timestamp($stamp1, "parser");

	// Libertree has a problem with escaped hashtags.
	$Text = str_replace(array('\#'), array('#'), $Text);

	// Remove any leading or trailing whitespace, as this will mess up
	// the Diaspora signature verification and cause the item to disappear
	$Text = trim($Text);

	call_hooks('bb2diaspora',$Text);

	return $Text;
}

function unescape_underscores_in_links($m) {
	$y = str_replace('\\_','_', $m[2]);
	return('[' . $m[1] . '](' . $y . ')');
}

function format_event_diaspora($ev) {

	$a = get_app();

	if(! ((is_array($ev)) && count($ev)))
		return '';

	$bd_format = t('l F d, Y \@ g:i A') ; // Friday January 18, 2011 @ 8 AM

	$o = 'Friendica event notification:' . "\n";

	$o .= '**' . (($ev['summary']) ? bb2diaspora($ev['summary']) : bb2diaspora($ev['desc'])) .  '**' . "\n";

	$o .= t('Starts:') . ' ' . '['
		. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC', 
			$ev['start'] , $bd_format ))
			:  day_translate(datetime_convert('UTC', 'UTC', 
			$ev['start'] , $bd_format)))
		.  '](' . $a->get_baseurl() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['start'])) . ")\n";

	if(! $ev['nofinish'])
		$o .= t('Finishes:') . ' ' . '[' 
			. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC', 
				$ev['finish'] , $bd_format ))
				:  day_translate(datetime_convert('UTC', 'UTC', 
				$ev['finish'] , $bd_format )))
			. '](' . $a->get_baseurl() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['finish'])) . ")\n";

	if(strlen($ev['location']))
		$o .= t('Location:') . bb2diaspora($ev['location']) 
			. "\n";

	$o .= "\n";
	return $o;
}