WordPress: Shortcodes in Text Widgets

ack

ericteubert: ~/Sites/wordpress-single 
➜ ack widget_text
wp-admin/includes/schema.php
307:	'widget_text' => array(),

wp-content/plugins/ikonum/class/class.custom-field-template.php
101:			add_filter('widget_text', 'do_shortcode');

wp-includes/default-widgets.php
371:		$widget_ops = array('classname' => 'widget_text', 'description' => __('Arbitrary text or HTML'));
379:		$text = apply_filters( 'widget_text', $instance['text'], $instance );

wp-includes/widgets.php
405:	'wp_widget_text',
406:	'wp_widget_text_control',

add_filter.php

<?php
function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
	global $wp_filter, $merged_filters;

	$idx = _wp_filter_build_unique_id($tag, $function_to_add, $priority);
	$wp_filter[$tag][$priority][$idx] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
	unset( $merged_filters[ $tag ] );
	return true;
}

core_do_shortcode.php

<?php
function do_shortcode($content) {
	global $shortcode_tags;

	if (empty($shortcode_tags) || !is_array($shortcode_tags))
		return $content;

	$pattern = get_shortcode_regex();
	return preg_replace_callback('/'.$pattern.'/s', 'do_shortcode_tag', $content);
}

doshortcode.php

<?php
add_filter( 'widget_text', 'do_shortcode' );

doshortcodetitle.php

<?php
add_filter( 'widget_title', 'do_shortcode' );