No function names needed to add TGM

tgm-plugin-activation.php

<?php

//
// Check the plugin dependencies
//
add_action('init', function(){

	// Only Check for requirements in the admin
	if(!is_admin()){
		return;
	}

	// Require TGM
	require ( dirname(__FILE__) . '/includes/resources/tgm/class-tgm-plugin-activation.php' );

	// Hook required plugins function to the tgmpa_register action
	add_action( 'tgmpa_register', function() {


		// Create the required plugins array
		$plugins['advanced-custom-fields'] = array(
			'name'     => 'Advanced Custom Fields',
			'slug'     => 'advanced-custom-fields',
			'required' => true,
		);

		// todo: Check if pro is instaled and if true add the pro version as attribute so that TGM will activate the pro Version
		if ( ! defined( 'BUDDYFORMS_PRO_VERSION' ) ) {
			$plugins['buddyforms'] = array(
				'name'      => 'BuddyForms',
				'slug'      => 'buddyforms',
				'required'  => true,
			);
		}

		$config = array(
			'id'           => 'buddyforms-tgmpa',  // Unique ID for hashing notices for multiple instances of TGMPA.
			'parent_slug'  => 'plugins.php',       // Parent menu slug.
			'capability'   => 'manage_options',    // Capability needed to view plugin install page, should be a capability associated with the parent menu used.
			'has_notices'  => true,                // Show admin notices or not.
			'dismissable'  => false,               // If false, a user cannot dismiss the nag message.
			'is_automatic' => true,                // Automatically activate plugins after installation or not.
		);

		// Call the tgmpa function to register the required plugins
		tgmpa( $plugins, $config );

	} );
}, 1, 1);