app/Helper/HookHelper.php

<?php

namespace Kanboard\Helper;

use Closure;
use Kanboard\Core\Base;

/**
 * Template Hook helpers
 *
 * @package helper
 * @author  Frederic Guillot
 */
class HookHelper extends Base
{
    /**
     * Add assets JS or CSS
     *
     * @access public
     * @param  string  $type
     * @param  string  $hook
     * @return string
     */
    public function asset($type, $hook)
    {
        $buffer = '';

        foreach ($this->hook->getListeners($hook) as $params) {
            $buffer .= $this->helper->asset->$type($params['template']);
        }

        return $buffer;
    }

    /**
     * Render all attached hooks
     *
     * @access public
     * @param  string  $hook
     * @param  array   $variables
     * @return string
     */
    public function render($hook, array $variables = array())
    {
        $buffer = '';

        foreach ($this->hook->getListeners($hook) as $params) {
            $currentVariables = $variables;
            if (! empty($params['variables'])) {
                $currentVariables = array_merge($variables, $params['variables']);
            } elseif (! empty($params['callable'])) {
                $result = call_user_func_array($params['callable'], array_values($variables));

                if (is_array($result)) {
                    $currentVariables = array_merge($variables, $result);
                }
            }

            $buffer .= $this->template->render($params['template'], $currentVariables);
        }

        return $buffer;
    }

    /**
     * Attach a template to a hook
     *
     * @access public
     * @param  string $hook
     * @param  string $template
     * @param  array  $variables
     * @return $this
     */
    public function attach($hook, $template, array $variables = array())
    {
        $this->hook->on($hook, array(
            'template' => $template,
            'variables' => $variables,
        ));

        return $this;
    }

    /**
     * Attach a template to a hook with a callable
     *
     * Arguments passed to the callback are the one passed to the hook
     *
     * @access public
     * @param  string   $hook
     * @param  string   $template
     * @param  Closure  $callable
     * @return $this
     */
    public function attachCallable($hook, $template, Closure $callable)
    {
        $this->hook->on($hook, array(
            'template' => $template,
            'callable' => $callable,
        ));

        return $this;
    }
}