Add a button for Pocket to Scriptless Social Sharing.

pocket.php

<?php

add_filter( 'scriptlesssocialsharing_pocket_url', 'prefix_add_pocket', 10, 3 );
/**
 * Create the URL for the Pocket share/save button.
 *
 * @param $url
 * @param $button
 * @param $attributes
 *
 * @return string
 */
function prefix_add_pocket( $url, $button, $attributes ) {
	return sprintf( 'https://getpocket.com/save?url=%s&title=%s', $attributes['permalink'], $attributes['title'] );
}

add_filter( 'scriptlesssocialsharing_networks', 'prefix_scriptless_networks_pocket' );
/**
 * Add Pocket to settings/allowed sharing buttons
 *
 * @param $networks
 *
 * @return mixed
 */
function prefix_scriptless_networks_pocket( $networks ) {
	$networks['pocket'] = array(
		'name'  => 'pocket',
		'label' => __( 'Pocket', 'scriptless-social-sharing' ),
		'icon'  => 'f265',
		'color' => '#ef4056',
	);

	return $networks;
}