WordPress Template: CPT, custom post type loop (To use with FoundationPress theme)

__page-cpt.php

<?php
/**
 * Template Name: Custom Post
 *
 * @package FoundationPress
 * @since FoundationPress 1.0.0
 */

get_header(); 
wp_reset_query();
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$post_type = 'custom_post';
$posts_per_page = 1;
$args = array( 
    'post_type' => $post_type, 
    'posts_per_page' => $posts_per_page, 
    'paged' => $paged,
);
global $wp_query;
$wp_query = new WP_Query($args);
?>

<div class="main-container">
    <div class="main-grid">
        <main class="main-content">
	<?php if ( have_posts() ) : ?>

		<?php /* Start the Loop */ ?>
		<?php while ( have_posts() ) : the_post(); ?>
			<?php get_template_part( 'template-parts/content', get_post_format() ); ?>
		<?php endwhile; ?>

		<?php else : ?>
			<?php get_template_part( 'template-parts/content', 'none' ); ?>

		<?php endif; // End have_posts() check. ?>

		<?php /* Display navigation to next/previous pages when applicable */ ?>
		<?php
		if ( function_exists( 'foundationpress_pagination' ) ) :
			foundationpress_pagination();
		elseif ( is_paged() ) :
		?>
			<nav id="post-nav">
				<div class="post-previous"><?php next_posts_link( __( '&larr; Older posts', 'foundationpress' ) ); ?></div>
				<div class="post-next"><?php previous_posts_link( __( 'Newer posts &rarr;', 'foundationpress' ) ); ?></div>
			</nav>
		<?php endif; ?>

        </main>
        <?php get_sidebar(); ?>
    </div>
</div>

<?php get_footer();

_page-cpt-acf.php

<?php
/*
 * Template Name: CPT Index
 */
get_header(); 
if( get_field('page_post_type') ) {
    $post_type = get_field('page_post_type');
}
else {
    $post_type = 'post';
}
?>

<div class="main-wrap" role="main">


<article <?php post_class('main-content') ?> id="page-cpt-<?php echo $post_type; ?>">
    <?php while ( have_posts() ) : the_post(); ?>
        <header>
            <h1 class="entry-title"><?php the_title(); ?></h1>
        </header>

        <div class="entry-content">
            <?php the_content(); ?>
            <?php edit_post_link( __( 'Edit', 'foundationpress' ), '<span class="edit-link">', '</span>' ); ?>
        </div>
    <?php endwhile; ?>

    <?php

        wp_reset_query();
        $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
        $args = array( 
            'post_type' => $post_type, 
            'posts_per_page' => 8, 
            'paged' => $paged,
        );
        global $wp_query;
        $wp_query = new WP_Query($args);
        if ( have_posts() ) : ?>

            <?php 
            while ( have_posts() ) : the_post(); ?>
            
                    <div class="clearfix">
                        <?php
                        if ( has_post_thumbnail( $post->ID ) ) : ?>
                            <img src="<?php echo the_post_thumbnail_url('large'); ?>" alt="Image for <?php get_the_title() ?>">
                        <?php endif; ?>

                            <h4><a href="<?php the_permalink() ?>"><?php the_title() ?></a></h4>
                            <div class="entry-content"><?php the_excerpt();?></div>
       
                            <div class=""><a href="<?php the_permalink() ?>" class="button">Read More</a></div>
                              
                    </div>

                <?php 
            endwhile; ?>

            <?php
        endif; // End have_posts() check.

    /* Then the pagination links */
    /* Display navigation to next/previous pages when applicable */ ?>
    <?php if ( function_exists( 'foundationpress_pagination' ) ) { foundationpress_pagination(); } else if ( is_paged() ) { ?>
        <nav id="post-nav">
            <div class="post-previous"><?php next_posts_link( __( '&larr; Older posts', 'foundationpress' ) ); ?></div>
            <div class="post-next"><?php previous_posts_link( __( 'Newer posts &rarr;', 'foundationpress' ) ); ?></div>
        </nav>
    <?php } ?>
    </article>


    <?php do_action( 'foundationpress_after_content' ); ?>
    <?php get_sidebar(); ?>
</div>
<?php get_footer();

_page-settings-cpt-index.php

<?php
if( function_exists('acf_add_local_field_group') ):

acf_add_local_field_group(array (
	'key' => 'group_573d737196da9',
	'title' => 'Page Settings: CPT Index',
	'fields' => array (
		array (
			'key' => 'field_573d737b104c6',
			'label' => 'Page Post Type',
			'name' => 'page_post_type',
			'type' => 'select',
			'instructions' => '',
			'required' => 0,
			'conditional_logic' => 0,
			'wrapper' => array (
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'choices' => array (
			),
			'default_value' => array (
			),
			'allow_null' => 0,
			'multiple' => 0,
			'ui' => 0,
			'ajax' => 0,
			'placeholder' => '',
			'disabled' => 0,
			'readonly' => 0,
		),
	),
	'location' => array (
		array (
			array (
				'param' => 'page_template',
				'operator' => '==',
				'value' => 'page-templates/page-cpt.php',
			),
		),
	),
	'menu_order' => 0,
	'position' => 'side',
	'style' => 'default',
	'label_placement' => 'top',
	'instruction_placement' => 'label',
	'hide_on_screen' => '',
	'active' => 1,
	'description' => '',
));

/*
 * Gets all posts types and injects them into select box so user 
 * can select post type
 *
 * Used by two ACF field groups
 */
function acf_load_post_types_choices( $field ) {   
    // reset choices
    $field['choices'] = array();
    // Posts are built in so we add them here instead
    $field['choices']['post' ] = 'Post';
    // Filter the query so only custom post types are returned
    $args = array(
       '_builtin' => false
    );

    $output = 'names'; // names or objects, note names is the default
    $operator = 'and'; // 'and' or 'or'

    // Get post types
    $post_types = get_post_types( $args, $output, $operator ); 

    foreach ( $post_types as $post_type ) {
        // Do not add the types in the array
        if ( !in_array($post_type, array('acf-field-group','acf-field'), true ) ) {
            $field['choices'][$post_type] = ucwords( str_replace('_', ' ', $post_type) );
        }
    }
    // return the field
    return $field;
    
}
// Unknown injection 
// add_filter('acf/load_field/name=post_type', 'acf_load_post_types_choices');
add_filter('acf/load_field/name=page_post_type', 'acf_load_post_types_choices');

endif;

page-cpt.php

<?php
/*
 * Template Name: CPT Index
 */

get_header(); 
if( get_field('page_post_type') ) {
    $post_type = get_field('page_post_type');
}
else {
    $post_type = 'post';
}
?>

<div id="page" role="main">
    <article class="main-content">
        <?php 
            $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
            $args = array( 
                'post_type' => $post_type, 
                'posts_per_page' => 4, 
                'paged' => $paged,
            );
            global $wp_query;
            $wp_query = new WP_Query($args);
            if ( have_posts() ) :
                while ( have_posts() ) : the_post();                        
                    ?>
                    <div class="content-wrapper">
                        <h2><a href="<?php the_permalink() ?>"><?php the_title() ?></a></h2>
                        <div class="entry-content"><?php the_excerpt();?></div>                       
                    </div>
                    <?php 
                endwhile; 
            else :
                get_template_part( 'template-parts/content', 'none' ); 

            endif; // End have_posts() check.
        wp_reset_query();
        ?>

        <!-- then the pagination links -->

        <?php /* Display navigation to next/previous pages when applicable */ ?>
        <?php if ( function_exists( 'foundationpress_pagination' ) ) { foundationpress_pagination(); } else if ( is_paged() ) { ?>
            <nav id="post-nav">
                <div class="post-previous"><?php next_posts_link( __( '&larr; Older posts', 'foundationpress' ) ); ?></div>
                <div class="post-next"><?php previous_posts_link( __( 'Newer posts &rarr;', 'foundationpress' ) ); ?></div>
            </nav>
        <?php } ?>

    </article>
    <?php get_sidebar(); ?>

</div>

<?php get_footer();