ILatteMacrosProviderExample.php

<?php

class MacroInstaller extends Latte\Macros\MacroSet
{

	const OUTPUT = 'do-everything-with-that';

	/**
	 * @param Compiler $compiler
	 * @return void|static
	 */
	public static function install(Latte\Compiler $compiler)
	{
		$me = new static($compiler);
		$me->addMacro('macroName', "echo '" . self::OUTPUT . "'");
	}
} 

class MacroExtension extends Nette\DI\CompilerExtension implements Flame\Modules\Providers\ILatteMacrosProvider
{

    /**
     * Get array of latte macros classes
     *
     * @return array
     */
    public function getLatteMacros()
    {
        return array(
            'MacroInstaller'
        );
    }
}