[WordPress] Shortcode - Post list.

functions.php

<?php
/**
 * Shortcode - Post list.
 *
 * @param array $atts The Shortcode arguments.
 *
 * @return string
 */
function kuck1u_shortcode_postlist( $atts ) {
	$atts          = shortcode_atts( array(
		'type'  => 'post',
		'tax'   => 'category',
		'terms' => '',
	), $atts, 'postlist' );
	$atts['type']  = sanitize_key( $atts['type'] );
	$atts['tax']   = sanitize_key( $atts['tax'] );
	$atts['terms'] = array_map( 'sanitize_key', explode( ',', $atts['terms'] ) );
	$args          = array(
		'post_type'      => $atts['type'],
		'tax_query'      => array(
			array(
				'taxonomy' => $atts['tax'],
				'field'    => 'slug',
				'terms'    => $atts['terms'],
			),
		),
		'post_status'    => 'publish',
		'nopaging'       => true,
		'posts_per_page' => '-1',
	);
	$cache_key     = 'kuck1u_47888_shortcode_post';
	$cache         = get_transient( $cache_key );
	$output        = array();

	if ( empty( $atts['terms'][0] ) ) {
		$args['tax_query'][0]['operator'] = 'NOT IN';
	}

	if ( false === $cache ) {
		$query = new WP_Query( $args );

		if ( $query->have_posts() ) {
			while ( $query->have_posts() ) {
				$query->the_post();
				ob_start();
				get_template_part( 'content', 'search' );
				$output[] = trim( ob_get_contents() );
				ob_end_clean();
			}
		}

		wp_reset_postdata();

		$output = implode( PHP_EOL, $output );

		set_transient( $cache_key, $output, 12 * HOUR_IN_SECONDS );
	} else {
		$output = $cache;
	}

	return $output;
}
add_shortcode( 'postlist', 'kuck1u_shortcode_postlist' );

How to use

[postlist terms="design,illust"] 

[postlist type="portfolio" tax="portfolio-cat" terms="design,illust"]