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Editing: gist.php

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<?php
/**
 * GitHub's Gist site supports oEmbed but their oembed provider only
 * returns raw HTML (no styling) and the first little bit of the code.
 *
 * Their JavaScript-based embed method is a lot better, so that's what we're using.
 */

wp_embed_register_handler( 'github-gist', '#https?://gist\.github\.com/([a-zA-Z0-9/]+)(\#file\-[a-zA-Z0-9\_\-]+)?#', 'github_gist_embed_handler' );
add_shortcode( 'gist', 'github_gist_shortcode' );

/**
 * Handle gist embeds.
 *
 * @since 2.8.0
 *
 * @global WP_Embed $wp_embed
 *
 * @param array  $matches Results after parsing the URL using the regex in wp_embed_register_handler().
 * @param array  $attr    Embed attributes.
 * @param string $url     The original URL that was matched by the regex.
 * @param array  $rawattr The original unmodified attributes.
 * @return string The embed HTML.
 */
function github_gist_embed_handler( $matches, $attr, $url, $rawattr ) {
	// Let the shortcode callback do all the work
	return github_gist_shortcode( $matches, $url );
}

/**
 * Callback for gist shortcode.
 *
 * @since 2.8.0
 *
 * @param array  $atts Attributes found in the shortcode.
 * @param string $content Content enclosed by the shortcode.
 *
 * @return string The gist HTML.
 */
function github_gist_shortcode( $atts, $content = '' ) {

if ( empty( $atts[0] ) && empty( $content ) ) {
		return '';
	}

$id = ( ! empty( $content ) ) ? $content : $atts[0];

// Parse a URL
	if ( ! is_numeric( $id ) ) {
		$id = preg_replace( '#https?://gist.github.com/([a-zA-Z0-9]+)#', '$1', $id );
	}

if ( ! $id ) {
		return '';
	}

wp_enqueue_script( 'jetpack-gist-embed', plugins_url( 'js/gist.js', __FILE__ ), array( 'jquery' ), false, true );

if ( false !== strpos( $id, '#file-' ) ) {
		// URL points to a specific file in the gist
		$id = str_replace( '#file-', '.json?file=', $id );
		$id = preg_replace( '/\-(?!.*\-)/', '.', $id );
	} else {
		$file = ( ! empty( $atts['file'] ) ) ? '?file=' . urlencode( $atts['file'] ) : '';
		// URL points to the entire gist
		$id .= ".json$file";
	}

// inline style to prevent the bottom margin to the embed that themes like TwentyTen, et al., add to tables
	$return = '<style>.gist table { margin-bottom: 0; }</style><div class="gist-oembed" data-gist="' . esc_attr( $id ) . '"></div>';

if ( isset( $_POST[ 'type' ] ) && 'embed' === $_POST[ 'type' ] &&
		 isset( $_POST[ 'action' ] ) && 'parse-embed' === $_POST['action'] ) {
		return github_gist_simple_embed( $id );
	}

return $return;
}

/**
 * Use script tag to load shortcode in editor.
 *
 * @since 3.9.0
 *
 * @param string $id The ID of the gist.
 *
 * @return string
 */
function github_gist_simple_embed( $id ) {
	$id = str_replace( 'json', 'js', $id );
	return '<script type="text/javascript" src="https://gist.github.com/' . $id . '"></script>';
}

Editing: gist.php

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