Adding Fields to Layouts with ParserFactory

<?php
function post_install(){
    $GLOBALS['log']->info("Starting Post Install script for PSI_LVM module...");
    psi_lvm_add_to_listview();
    psi_lvm_add_to_dashlet();
    $GLOBALS['log']->info("Ending Post Install script for PSI_LVM module...");
}

function psi_lvm_add_to_listview(){
    require_once('modules/ModuleBuilder/parsers/ParserFactory.php');

    /**
     * @var ListLayoutMetaDataParser a parser for the listview metadata
     */
    $parser = ParserFactory::getParser('listview', 'Calls');

    /**
     * @var array will contain the new array structure, largely based upon the old one
     */
    $_viewdefs = array();

    /**
     * @var bool to see if we're on the first field or elsewhere
     */
    $first=true;
    foreach($parser->_viewdefs as $key=>$value){
        $_viewdefs[$key] = $value;
        if($first){
            $_viewdefs['psi_lvm_c'] = array (
                'width' => '10%',
                'label' => 'LBL_PSI_LVM',
                'default' => true,
                'sortable' => false,
                'related_fields' => array('status'),
            );
            $first = false;
        }
    }
    $parser->_viewdefs = $_viewdefs;
    $parser->handleSave(false);
}

function psi_lvm_add_to_dashlet(){
    /**
     * @var ListLayoutMetaDataParser a parser for the listview metadata
     */
    $parser = ParserFactory::getParser('dashlet', 'Calls');
    $parser->_viewdefs['psi_lvm_c'] = array(
        'type' => 'PSI_Left_Voicemail',
        'label' => 'LBL_PSI_LVM',
        'width' => '10%',
        'default' => false,
        'sortable' => false,
    );
    $parser->handleSave(false);
}