Hello,

I've just published my pawGFM Filter, which extends the Wolf CMS with an Github flavored Markdown editor and a respective parser. The heart of the plugin is my tail.writer JavaScript editor, which supports since version 0.2.0 Alpha also the jQuery library.

The editor is still Alpha, so please tell me if you found some bugs or strange behaviours. The tail.writer script is also available as stand-alone script on GitHub. (There is also a full demonstration)

Features

GFM
The GitHub Flavored Markdown markup syntax supports tables, strikethrough and <pre> code blocks with the "```" token. (And my tail.writer editor supports also underlined text via HTML).

Multi-Line Edits
You can select multiple lines and click (for example) on the list action. It will add a list token (eg.: "- ") to each single line.

Auto-Walker
If you start a list and press Enter, after your first list item, it will insert the list item token (eg.: "- ") automatically. If you press enter again (without writing anything), it will break the list block and remove the last empty list item.

Working TAB and SHIFT+TAB
You can Indent and Outdent a line by pressing TAB and SHIFT+TAB and it works fluid. (The default markdown editor has a bug, where multiple Indents cannot be removed by pressing SHIFT+TAB, at least in Chrome).

Resizeable
The textarea field will increases its height automatically if more place is needed.

Parser Engines
The JS-side markdown parsing (for the preview function) is performed by marked and the PHP-side parsing is performed by Parsedown (+ Parsedown Extra).

Screenshot

(Click to increase.)

I hope you like it.

Sincerely,
Sam.