Formulario simple de login a través de código en WordPress, usando el shortcode [dcms_form_login]

form-login-WordPress.php

<?php // No copiar esta línea

function dcms_form_login_config() {
	$redirect_login = get_home_url();
	$redirect_logout = get_home_url();

	if ( ! is_user_logged_in() ):
		$args = array(
		    'echo'            => false,
		    'redirect'        => $redirect_login,
		  );
		  return wp_login_form( $args );
	else:
		$current_user = wp_get_current_user();
		$url_logout = wp_logout_url( $redirect_logout );

		$str = get_avatar($current_user->user_email, 24).' ';
		$str .= 'Hola '.$current_user->display_name.'<br>';
		$str .= '<a href="' . $url_logout . '">Desconectarse</a>';

		return $str;
	endif;
}

function dcms_add_shortcode_login(){
	add_shortcode( 'dcms_form_login', 'dcms_form_login_config' );
}
add_action( 'init', 'dcms_add_shortcode_login' );