I'm interested in posting in Markdown Extra and was trying to find a way to preview Markdown Extra documents in MarsEdit. I have found a directory in MarsEdit.app/Resources/TextFilter, but I'm not sure if it's possible to add other filters, which are written in PHP. (Others are written in Perl.)A thread in TextMate mailing list
has a hint for me. But, I don't know what to do with MarsEdit. Also I'm curious if using a PHP file makes users feel noticeably slower than other filters that are written in Perl.
Any future support for this filter or other filters, built-in or in a way users can expand, would be appreciated.