Filters

[ryanburnette]

@stephenharris I hope creating an issue on your Github repo isn't too invasive, but I'm curious about a couple things and I haven't found an answer in your documentation. There are a couple things I'd like to do with Filters and WP-Markdown.

One is that I'd like to use the Markdown filter for text I store in custom fields. Is there a way to use apply_filters to process Markdown that I've stored on my own?

Also, I'd like to add processing to the filter which processes the Markdown. This is less important as I can filter using the the_content filter tag, but it might be cool to add additional processing using PHP that I keep in a separate plugin on certain projects.

Thanks in advance!

Ryan

[stephenharris]

Hi Ryan,

Not at all :).

The plug-in exposes two functions (see https://github.com/stephenharris/WP-MarkDown/blob/1.4/wp-markdown.php#L519). One for converting Markdown to HTML and the other doing the opposite. You can use those functions in any other plug-in.

As for filters when Markdown is run - there isn't, the plug-in uses WordPress' filters, so you can just use the same hooks (before/after wp-markdown's callback depending on whether you want the content in HTML or markdown when you perform your routine). I may add two filters in the above mentioned functions.

[ryanburnette]

Thanks for getting back to me!

I'll definitely make use of this. It would be very WordPressy if these functions were WordPress filters, too.

[ryanburnette]

I still think this would be a good addition to the plugin. If you want I can do a pull request. It's as easy as this.

function markdown_func($content) {
  if ( function_exists('wpmarkdown_markdown_to_html') ) {
    return wpmarkdown_markdown_to_html($content);
  }

  return $content;
}
add_filter('markdown','st_markdown_func');

[stephenharris]

Hi Ryan,

The above uses the filter markdown - this isn't a filter used by the plug-in or WordPress, so it's not clear to me what its filtering, or when its filtering it...

Or is it a case of:

$markdown = '...some text in markdown...';
$html = apply_filters( 'markdown', $markdown )

If so, I don't think a filter here is necessary, just call:

$html =  markdown_func( $markdown );

[ryanburnette]

It's a WordPress plugin so my opinion is that offering a filter is cleaner. Same diff in the end. Closing.

[ryanburnette]

But just in case anyone is like me and wants to utilize this functionality using filters, here's the code.

https://gist.github.com/ryanburnette/0fc9b9ab1eb41877ffd3