WordPress Must-Use Plugins - Save these files in `wp-content/mu-plugins` to start using them immediately.

cake_admin_menu.php

<?php

/*
Plugin Name: Override: Admin Menu
Description: Modify admin menu items on the left panel.
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

/**
 * Admin menus.
 */
function cake_admin_menu($context) {
	// Hide from users with low privilege. Doesn't change access settings though.
	if (!current_user_can('manage_options')) {
		// Core Menus
		// remove_menu_page( 'index.php' );               //Dashboard
		// remove_menu_page( 'edit.php' );                //Posts
		// remove_menu_page( 'upload.php' );              //Media
		// remove_menu_page( 'edit.php?post_type=page' ); //Pages
		remove_menu_page( 'edit-comments.php' );       //Comments
		// remove_menu_page( 'themes.php' );              //Appearance
		// remove_menu_page( 'plugins.php' );             //Plugins
		// remove_menu_page( 'users.php' );               //Users
		remove_menu_page('tools.php');               //Tools
		// remove_menu_page( 'options-general.php' );     //Settings

		// Plugins
		// remove_menu_page( 'jetpack' );                 //Jetpack
	}
}
add_action('admin_menu', 'cake_admin_menu', 10, 1);

cake_debug.php

<?php

/*
Plugin Name: Debug
Description: Debugging related helper functions and overrides.
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

/**
 * Allow only superadmins to access kint output.
 */
add_filter('kint_debug_display', function ($allow) {
  return is_super_admin();
});

/**
 * Prints HTML comments to mark beginning and ending of each template implementing it.
 */
function templateName($label = 'BEGIN', $path = __FILE__) {
  if (defined('WP_DEBUG') && WP_DEBUG) {
    if ($docroot = getenv('WEBSERVER_DOCROOT')) {
      $path = str_replace($docroot, '',$path);
    }
    echo sprintf("\n<!-- %s TEMPLATE: %s -->\n", $label, $path);
  }
}

cake_excerpt_length.php

<?php

/*
Plugin Name: Override: Excerpt Length
Description: Overrides the default excerpt length for all post types.
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

/**
 * Set custom excerpt length.
 */
function cake_excerpt_length($number) {
  return 20;
}
add_filter('excerpt_length', 'cake_excerpt_length');

cake_flamingo_map_meta_cap.php

<?php

/*
Plugin Name: Override: Flamingo
Description: Enable access to Flamingo pages for all users with permission to edit pages.
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

function cake_flamingo_map_meta_cap($meta_caps) {
  $meta_caps = array_merge($meta_caps, array(
    'flamingo_edit_contact' => 'edit_pages',
    'flamingo_edit_contacts' => 'edit_pages',
    'flamingo_delete_contact' => 'edit_pages',
    'flamingo_edit_inbound_message' => 'edit_pages',
    'flamingo_edit_inbound_messages' => 'edit_pages',
    'flamingo_delete_inbound_message' => 'edit_pages',
    'flamingo_delete_inbound_messages' => 'edit_pages',
    'flamingo_spam_inbound_message' => 'edit_pages',
    'flamingo_unspam_inbound_message' => 'edit_pages',
    'flamingo_edit_outbound_message' => 'edit_users',
    'flamingo_edit_outbound_messages' => 'edit_users',
    'flamingo_delete_outbound_message' => 'edit_users',
  ));

  return $meta_caps;
}
add_filter('flamingo_map_meta_cap', 'cake_flamingo_map_meta_cap');

cake_news_post_type.php

<?php

/*
Plugin Name: In The Press
Description: Creates a new post-type "In The News" for news articles, mentions in the press, etc.
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

/**
 * In The Press post type.
 *
 * @see https://codex.wordpress.org/Function_Reference/register_post_type
 */
function cake_news_post_type() {
  $labels = [
    'name'                  => _x('In The Press', 'Post Type General Name', 'cake'),
    'singular_name'         => _x('News Article', 'Post Type Singular Name', 'cake'),
    'menu_name'             => __('In The Press', 'cake'),
    'name_admin_bar'        => __('News Article', 'cake'),
    'archives'              => __('News Archives', 'cake'),
    'attributes'            => __('Item Attributes', 'cake'),
    'parent_item_colon'     => __('Parent Item:', 'cake'),
    'all_items'             => __('All news articles', 'cake'),
    'add_new_item'          => __('Add new article', 'cake'),
    'add_new'               => __('Add new', 'cake'),
    'new_item'              => __('New article', 'cake'),
    'edit_item'             => __('Edit article', 'cake'),
    'update_item'           => __('Update article', 'cake'),
    'view_item'             => __('View News Article', 'cake'),
    'view_items'            => __('View News Articles', 'cake'),
    'search_items'          => __('Search News Articles', 'cake'),
    'not_found'             => __('Not found', 'cake'),
    'not_found_in_trash'    => __('Not found in Trash', 'cake'),
    'featured_image'        => __('Featured Image', 'cake'),
    'set_featured_image'    => __('Set featured image', 'cake'),
    'remove_featured_image' => __('Remove featured image', 'cake'),
    'use_featured_image'    => __('Use as featured image', 'cake'),
    'insert_into_item'      => __('Insert into item', 'cake'),
    'uploaded_to_this_item' => __('Uploaded to this item', 'cake'),
    'items_list'            => __('Items list', 'cake'),
    'items_list_navigation' => __('Items list navigation', 'cake'),
    'filter_items_list'     => __('Filter items list', 'cake'),
  ];
  $args = [
    'label'                 => __('News Article', 'cake'),
    'labels'                => $labels,
    'description'           => __('News Article information page.', 'cake'),
    'public'                => true,
    'exclude_from_search'   => false,
    'publicly_queryable'    => true,
    'show_ui'               => true,
    'show_in_nav_menus'     => true,
    'show_in_menu'          => true,
    'show_in_admin_bar'     => true,
    'menu_position'         => 5,
    'menu_icon'             => 'dashicons-id-alt',
    'capability_type'       => 'post',
    'map_meta_cap'          => true,
    'hierarchical'          => false,
    'supports'              => ['title', 'editor', 'author', 'thumbnail', 'excerpt', 'revisions'],
    'taxonomies'            => ['category'],
    'has_archive'           => 'about/in-the-news',
    'rewrite'               => ['slug' => 'about/in-the-news'],
    'can_export'            => true,
    'show_in_rest'          => true,
  ];
  register_post_type('news', $args);
}
add_action('init', 'cake_news_post_type');

/**
 * Flush Rewrite on Activation.
 */
function cake_news_rewrite_flush() {
  cake_news_post_type();
  flush_rewrite_rules();
}
register_activation_hook(__FILE__, 'cake_news_rewrite_flush');

cake_posts_shortcode.php

<?php

/*
Plugin Name: Shortcode: Posts
Description: Creates a simple shortcode to embed a list of posts of selected type, and number. i.e. `[posts type='testimonials' limit='-1' orderby='date' order='DESC']`
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

// Add Shortcode
function cake_posts_shortcode($attributes) {
  ob_start();
  $attributes = shortcode_atts(
		[
      'type' => 'post',
      'limit' => '10',
      'orderby' => 'date',
      'order' => 'DESC',
    ],
    $attributes,
		'posts'
  );

  $args = [
    'post_type' => $attributes['type'],
    'posts_per_page' => $attributes['limit'],
    'orderby' => $attributes['orderby'],
    'order' => $attributes['order'],
  ];

	$wpQuery = new WP_Query($args);

  // $output = '';
  if ($wpQuery->have_posts()) {
    while ($wpQuery->have_posts()) :
      $wpQuery->the_post();
      get_template_part('template-parts/content/content', 'excerpt');
    endwhile;
  }
  else {
    echo _('There are no posts the display.');
  }
  wp_reset_query();
}
add_shortcode('posts', 'cake_posts_shortcode');

cake_services.php

<?php

/*
Plugin Name: Services
Description: Creates a new post-type Service, and a taxonomy with same name. Taxonomy is linked to post-type.
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

/**
 * Cake: Service post type.
 *
 * @see https://codex.wordpress.org/Function_Reference/register_post_type
 */
function cake_service_post_type() {
  $labels = [
    'name'                  => _x('Service', 'Post Type General Name', 'cake'),
    'singular_name'         => _x('Service', 'Post Type Singular Name', 'cake'),
    'menu_name'             => __('Services', 'cake'),
    'name_admin_bar'        => __('Service', 'cake'),
    'archives'              => __('Services', 'cake'),
    'attributes'            => __('Item Attributes', 'cake'),
    'parent_item_colon'     => __('Parent Item:', 'cake'),
    'all_items'             => __('All Services', 'cake'),
    'add_new_item'          => __('Add New Service', 'cake'),
    'add_new'               => __('Add New', 'cake'),
    'new_item'              => __('New Service', 'cake'),
    'edit_item'             => __('Edit Service', 'cake'),
    'update_item'           => __('Update Service', 'cake'),
    'view_item'             => __('View Service', 'cake'),
    'view_items'            => __('View Services', 'cake'),
    'search_items'          => __('Search Services', 'cake'),
    'not_found'             => __('Not found', 'cake'),
    'not_found_in_trash'    => __('Not found in Trash', 'cake'),
    'featured_image'        => __('Featured Image', 'cake'),
    'set_featured_image'    => __('Set featured image', 'cake'),
    'remove_featured_image' => __('Remove featured image', 'cake'),
    'use_featured_image'    => __('Use as featured image', 'cake'),
    'insert_into_item'      => __('Insert into item', 'cake'),
    'uploaded_to_this_item' => __('Uploaded to this item', 'cake'),
    'items_list'            => __('Services list', 'cake'),
    'items_list_navigation' => __('Services list navigation', 'cake'),
    'filter_items_list'     => __('Filter items list', 'cake'),
  ];
  $args = [
    'label'                 => __('Service', 'cake'),
    'labels'                => $labels,
    'description'           => __('', 'cake'),
    'public'                => true,
    'exclude_from_search'   => false,
    'publicly_queryable'    => true,
    'show_ui'               => true,
    'show_in_nav_menus'     => true,
    'show_in_menu'          => true,
    'show_in_admin_bar'     => true,
    'menu_position'         => 5,
    'menu_icon'             => 'dashicons-format-gallery',
    'capability_type'       => 'post',
    'map_meta_cap'          => true,
    'hierarchical'          => false,
    'supports'              => ['title', 'editor', 'author', 'thumbnail', 'excerpt', 'revisions'],
    'taxonomies'            => ['services'],
    'has_archive'           => 'services',
    'rewrite'               => ['slug' => 'services/%services%'],
    'can_export'            => true,
    'show_in_rest'          => true,
  ];
  register_post_type('service', $args);
}
add_action('init', 'cake_service_post_type');


/**
 * Cake: Services taxonomy used solely for Service post-type.
 */
function cake_service_taxonomy() {
	$labels = array(
    'name'                       => _x('Service types', 'Taxonomy General Name', 'cake'),
    'singular_name'              => _x('Service', 'Taxonomy Singular Name', 'cake'),
		'menu_name'                  => __('Service types', 'cake' ),
    'all_items'                  => __('All Service Types', 'cake'),
    'edit_item'                  => __('Edit Service Type', 'cake'),
    'view_item'                  => __('View Service Type', 'cake'),
    'update_item'                => __('Update Service Type', 'cake'),
    'add_new_item'               => __('Add New Service Type', 'cake'),
    'new_item_name'              => __('New Service Type', 'cake'),
    'parent_item'                => __('Parent Service Type', 'cake'),
    'parent_item_colon'          => __('Parent Service Type:', 'cake'),
    'search_items'               => __('Search Service Types', 'cake'),
    'popular_items'              => __('Popular Service Types', 'cake'),
    'separate_items_with_commas' => __('Separate service types with commas', 'cake'),
    'add_or_remove_items'        => __('Add or remove service types', 'cake'),
    'choose_from_most_used'      => __('Choose from the most used service types', 'cake'),
    'not_found'                  => __('Not Found', 'cake'),
    'back_to_items'              => __('Back to services', 'cake'),
	);
	$rewrite = array(
		'slug'                       => 'services',
		'with_front'                 => true,
		'hierarchical'               => true,
	);
	$args = array(
		'labels'                     => $labels,
    'public'                     => true,
    'publicly_queryable'         => true,
    'show_ui'                    => true,
    'show_in_menu'               => true,
    'show_in_nav_menus'          => true,
    'show_in_rest'               => true,
    'show_tagcloud'              => true,
    'show_in_quick_edit'         => true,
    'show_admin_column'          => true,
    'description'                => __('Our available services'),
    'hierarchical'               => false,
		'rewrite'                    => $rewrite,
	);
	register_taxonomy( 'services', array( 'service' ), $args );
}
add_action( 'init', 'cake_service_taxonomy', 0 );

function cake_service_post_link($post_link, $id = 0) {
  $post = get_post($id);
  if (is_object($post)) {
    $terms = wp_get_object_terms($post->ID, 'services');
    if ($terms) {
      return str_replace('%services%', $terms[0]->slug, $post_link);
    }
  }
  return $post_link;
}
add_filter('post_type_link', 'cake_service_post_link', 1, 3);

/**
 * Flush Rewrite on Activation.
 */
function cake_service_rewrite_flush() {
  cake_service_post_type();
  cake_service_taxonomy();
  flush_rewrite_rules();
}
register_activation_hook(__FILE__, 'cake_service_rewrite_flush');

cake_testimonials.php

<?php

/*
Plugin Name: Testimonials
Description: Creates a new post-type "Testimonials". Recommended to use Quote block for post entries.
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

/**
 * Testimonial post type.
 *
 * @see https://codex.wordpress.org/Function_Reference/register_post_type
 */
function cake_testimonial_post_type() {
  $labels = [
    'name'                  => _x('Testimonials', 'Post Type General Name', 'cake'),
    'singular_name'         => _x('Testimonial', 'Post Type Singular Name', 'cake'),
    'menu_name'             => __('Testimonials', 'cake'),
    'name_admin_bar'        => __('Testimonial', 'cake'),
    'archives'              => __('Item Archives', 'cake'),
    'attributes'            => __('Item Attributes', 'cake'),
    'parent_item_colon'     => __('Parent Item:', 'cake'),
    'all_items'             => __('All Testimonials', 'cake'),
    'add_new_item'          => __('Add New Item', 'cake'),
    'add_new'               => __('Add New', 'cake'),
    'new_item'              => __('New Item', 'cake'),
    'edit_item'             => __('Edit Item', 'cake'),
    'update_item'           => __('Update Item', 'cake'),
    'view_item'             => __('View Item', 'cake'),
    'view_items'            => __('View Testimonials', 'cake'),
    'search_items'          => __('Search Item', 'cake'),
    'not_found'             => __('Not found', 'cake'),
    'not_found_in_trash'    => __('Not found in Trash', 'cake'),
    'featured_image'        => __('Featured Image', 'cake'),
    'set_featured_image'    => __('Set featured image', 'cake'),
    'remove_featured_image' => __('Remove featured image', 'cake'),
    'use_featured_image'    => __('Use as featured image', 'cake'),
    'insert_into_item'      => __('Insert into item', 'cake'),
    'uploaded_to_this_item' => __('Uploaded to this item', 'cake'),
    'items_list'            => __('Testimonials list', 'cake'),
    'items_list_navigation' => __('Testimonials list navigation', 'cake'),
    'filter_items_list'     => __('Filter items list', 'cake'),
  ];
  $args = [
    'label'                 => __('Testimonial', 'cake'),
    'labels'                => $labels,
    'description'           => __('Read what others said about us.', 'cake'),
    'public'                => true,
    'exclude_from_search'   => false,
    'publicly_queryable'    => true,
    'show_ui'               => true,
    'show_in_nav_menus'     => true,
    'show_in_menu'          => true,
    'show_in_admin_bar'     => true,
    'menu_position'         => 5,
    'menu_icon'             => 'dashicons-format-quote',
    'capability_type'       => 'post',
    'map_meta_cap'          => true,
    'hierarchical'          => false,
    'supports'              => ['title', 'editor', 'author', 'thumbnail', 'revisions'],
    'taxonomies'            => [],
    'has_archive'           => 'about/testimonials',
    'rewrite'               => ['slug' => 'about/testimonials'],
    'can_export'            => true,
    'show_in_rest'          => true,
  ];
  register_post_type('testimonials', $args);
}
add_action('init', 'cake_testimonial_post_type');

/**
 * Flush Rewrite on Activation.
 */
function cake_testimonial_rewrite_flush() {
  cake_testimonial_post_type();
  flush_rewrite_rules();
}
register_activation_hook(__FILE__, 'cake_testimonial_rewrite_flush');

cake_wp_before_admin_bar_render.php

<?php

/*
Plugin Name: Override: Toolbar
Description: Modify the $wp_admin_bar object before it is used to render the Toolbar to the screen.
Author: Osman Gormus
Version: 1.0.0
Author URI: https://gorm.us/
*/

/**
 * @see https://codex.wordpress.org/Plugin_API/Action_Reference/wp_before_admin_bar_render
 */
function cake_wp_before_admin_bar_render() {
  global $wp_admin_bar;

  //Remove the WordPress logo...
  $wp_admin_bar->remove_menu('wp-logo');
}
add_action('wp_before_admin_bar_render', 'cake_wp_before_admin_bar_render');