+require_once('library/markdown.php');
+require_once('include/html2bbcode.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) {
+
+ // for testing purposes: Collect raw markdown articles
+ // $file = tempnam("/tmp/friendica/", "markdown");
+ // file_put_contents($file, $s);
+
+ $s = html_entity_decode($s,ENT_COMPAT,'UTF-8');
+
+ // Too many new lines. So deactivated the following line
+ // $s = str_replace("\r","\n",$s);
+ // Simply remove cr.
+ $s = str_replace("\r","",$s);
+
+ // <br/> is invalid. Replace it with the valid expression
+ $s = str_replace("<br/>","<br />",$s);
+
+ $s = preg_replace('/\@\{(.+?)\; (.+?)\@(.+?)\}/','@[url=https://$3/u/$2]$1[/url]',$s);
+
+ // Escaping the hash tags - doesn't always seem to work
+ // $s = preg_replace('/\#([^\s\#])/','\\#$1',$s);
+ // This seems to work
+ $s = preg_replace('/\#([^\s\#])/','#$1',$s);
+
+ $s = Markdown($s);
+
+ $s = str_replace('#','#',$s);
+
+ $s = str_replace("\n",'<br />',$s);
+
+ $s = html2bbcode($s);
+// $s = str_replace('*','*',$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 = preg_replace("/\[url\=?(.*?)\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/url\]/ism",'[youtube]$2[/youtube]',$s);
+ $s = preg_replace("/\[url\=https?:\/\/www.youtube.com\/watch\?v\=(.*?)\].*?\[\/url\]/ism",'[youtube]$1[/youtube]',$s);
+ $s = preg_replace("/\[url\=?(.*?)\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/url\]/ism",'[vimeo]$2[/vimeo]',$s);
+ $s = preg_replace("/\[url\=https?:\/\/vimeo.com\/([0-9]+)\](.*?)\[\/url\]/ism",'[vimeo]$1[/vimeo]',$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;
+}