Github Gist Shortcode

If you want to detect links to Github Gist in posts and replace them with shortcodes, then shortcodes will be replaced with embeded gist.

Instructions: Add the following code to the functions.php of your WordPress theme.

<?php
// [gist id="ID" file="FILE"]
function gist_shortcode($atts) {
  return sprintf(
    '<script src="https://gist.github.com/%s.js%s"></script>', 
    $atts['id'], 
    $atts['file'] ? '?file=' . $atts['file'] : ''
  );
} add_shortcode('gist','gist_shortcode');

// Remove this function if you don't want autoreplace gist links to shortcodes
function gist_shortcode_filter($content) {
  return preg_replace('/https://gist.github.com/([d]+)[.js?]*[#]*file[=|_]+([w.]+)(?![^<]*</a>)/i', '[gist id="${1}" file="${2}"]', $content );
} add_filter( 'the_content', 'gist_shortcode_filter', 9);
?>

Formats:

https://gist.github.com/1147076
https://gist.github.com/1147076#file_annotated.js
https://gist.github.com/1147076.js?file=annotated.js
[gist id=1147076]
[gist id=1147076 file=annotated.js]

It works perfectly in most cases, but there is one (or more?) case when it doesn’t work as it should:
https://gist.github.com/1147076#file_license.txt

If we add this URL to our post, it will display all files from this gist. It’s because the filename in gist is upper-cased. This one will work correctly:

https://gist.github.com/1147076.js?file=LICENSE.txt

You may also enjoy checking if shortcode already exists.