Helper function to retrieve Textdomain in ProcessWire using TemplateEngineBlade

_func.php

function getViewTextDomain($path)
{
    $config = wire('config');

    $input = str_replace('.', '-',
        str_replace($config->paths->root, '', $path)
    );

    $re = '/\/+/m';

    return preg_replace($re, '--', $input);
}

_init.php

$view->composer('*', function($view)
{
    $view->with('textdomain', getViewTextDomain($view->getPath()));
});