Wordpress: Contextually load content template parts for pages via get_template_part().

page.php

<?php
/**
 * The template for displaying all pages.
 *
 * This is the template that displays all pages by default.
 * Please note that this is the WordPress construct of pages
 * and that other 'pages' on your WordPress site will use a
 * different template.
 *
 * Additionally this template will try to retrieve the any 
 * custom template parts created for pages using the convention:
 * content-{page_name}.php where {page_name} is the slug/title of 
 * the WordPress page you are trying to target.
 *
 * @package Foo
 */

get_header(); ?>

<div id="primary" class="content-area">
	<main id="main" class="site-main" role="main">
		
		<?php while ( have_posts() ) : the_post(); ?>
			
			<?php
				// Contextually get the template part.
				$page_template = locate_template( "content-{$post->post_name}.php" );
				
				if ( $page_template != '' ) {
					
					// Yep, load custom template part.
					get_template_part( "content-{$post->post_name}.php" );
				}
				
				else {
				
					// Nope, load the default content template part (content-page.php).
					get_template_part( 'content', 'page' );
				}

			?>

		<?php endwhile; // end of the loop. ?>

	</main><!-- #main -->
</div><!-- #primary -->

<?php get_footer(); ?>