custom_shortcodes.module

<?php
/**
 * @file custom_shortcodes.module
 */

/**
 * Implements [mymodule]_shortcode_info
 *
 * Define our shortcodes and their titles, descriptions, and callback functions.
 * See the comments below for an explanation of each parameter
 *
 * @param none
 * @return array
 */
function custom_shortcodes_shortcode_info() {

    $shortcodes['button'] = array(
        'title' => t('Link Button'),  // The title of this shortcode, displayed in the Drupal backend for administrators to enable/disable shortcodes for input types
        'description' => t('A simple button.'),  // Description shown along with the title in the Drupal backend
        'process callback' => 'custom_shortcodes_shortcode_button', // Custom function that deals with the variables and html output
        'tips callback' => 'custom_shortcodes_shortcode_button_tip' // Custom function that displays some help text to the user
    );

    // $shortcodes['second_shortcode'] = array();
    // $shortcodes['third_shortcode'] = array();
    // and so on...

    return $shortcodes;
}


/**
 * Implements [mymodule]_theme
 *
 * Define our variables/attributes for each custom shortcode
 *
 * @param none
 * @return array
 */
function custom_shortcodes_theme() {

    return array(
        'shortcode_button' => array(
            'variables' => array('text' => '', 'link' => ''),
        ),
        // 'shortcode_second_shortcode' => array(),
        // 'shortcode_third_shortcode' => array(),
        // and so on...
    );

}


/**
 * Implements [mymodule]_shortcode_[shortcodename]
 *
 * Define our process callback function for our [button] shortcode. This
 * takes in our shortcode attributes from the shortcode and if empty, sets
 * the property to the default value stated in this function. We then pass
 * in our attributes to the theme() function which returns the HTML.
 *
 * $attrs = shortcode_attrs(array(
 *     'attribute' => 'default_value_goes_here'
 * ),
 *
 * @param $attrs array  Array of variables/attributes the user can customize
 * @return string
 */
function custom_shortcodes_shortcode_button($attrs, $text) {

    $attrs = shortcode_attrs(array(
        'link' => 'http://mywebsite.com'
    ), $attrs );

    return theme('shortcode_button', array('link' => $attrs['link'], 'text' => $text));

}


/**
 * Implements theme_shortcode_[shortcodename]
 *
 * This function returns the output of the shortcode.  The variables/attributes
 * are passed in as an array.
 *
 * @param $vars array
 * @return string
 */
function theme_shortcode_button($vars) {
    return '<div class="button"><a href="' . $vars['link'] . '">' . $vars['text'] . '</a></div>';
}


/**
 * Implements [mymodule]_shortcode_[shortcodename]_tip
 *
 * This function outputs text below the WYSIWYG editor to tell the user what
 * shortcodes are available and what the parameters are for the shortcode.
 *
 * @param $format stdClass Information about which text format is being used
 * @param $long bool Whether this is the 'More Info' page for the format
 * @return string The text to be returned
 */
function custom_shortcodes_shortcode_button_tip($format, $long) {

    $output = array();
    $output[] = '<p><strong>' . t('[button link="http://URLhere.com"]text[/button]') . '</strong> ';
    if ($long) {
        $output[] = t('Outputs text that is displayed as a button, which links to a specified URL.') . '</p>';
    }
    else {
        $output[] = t('Outputs text that links to a URL.') . '</p>';
    }

    return implode(' ', $output);

}