Moving admin to it's own directory, trying to fix up docblocks and stuff

admin/class-settings.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace PluginNamespace\Admin;
+
+class Settings {
+
+	/**
+	 * Class constructor.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @return void
+	 */
+	public function __construct() {
+		add_action( 'admin_menu', array( $this, 'append_to_admin_menu' ), 12 );
+
+		add_action( 'admin_enqueue_scripts', array( $this, 'register_scripts' ) );
+	}
+
+	/**
+	 * Append to the admin menu (prevents doubling).
+	 *
+	 * @since 1.0.0
+	 *
+	 * @return void
+	 */
+	public function append_to_admin_menu(): void {
+		$parent_slug = 'nmsp-plugin-name-menu-slug';
+		$page_title = __( 'Namespace Plugin Name - Settings', 'nmsp_plugin_name_settings_title' );
+		$menu_title = __( 'Settings', 'nmsp_plugin_name_settings_title' );
+		$capability = 'manage_options';
+		$menu_slug = $parent_slug;
+		$callback = array( $this, 'show_main_settings_page' );
+
+		add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $callback );
+	}
+
+	/**
+	 * Show the settings page.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @return string
+	 */
+	public function show_main_settings_page(): string {
+		$data = array();
+
+		$this->localize_script();
+
+		ob_start();
+		echo nmsp_plugin_app()->blade->run( 'admin.settings', $data );
+		$output = ob_get_clean();
+		return wp_kses_post( $output );
+	}
+
+	/**
+	 * Register and enqueue stylesheets and javascript files.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @return void
+	 */
+	public function register_scripts(): void {
+		wp_enqueue_style( 'nmsp-plugin-name-admin-css', plugins_url( '../assets/css/nmsp-plugin-name-admin.css', __FILE__ ), array(), '1.0.0', 'screen' );
+
+		wp_register_script( 'nmsp-plugin-name-admin-js', plugins_url( '../assets/js/nmsp-plugin-name-admin.js', __FILE__ ), array( 'jquery' ), '1.0.0', false );
+	}
+
+	/**
+	 * Description
+	 *
+	 * @since 1.0.0
+	 *
+	 * @param array $additional_data  (optional) Additional key-value paired data to pass to JavaScript.
+	 *
+	 * @return void
+	 */
+	private function localize_script( array $additional_data = array() ): void {
+		wp_enqueue_script( 'nmsp-plugin-name-admin-js' );
+
+		$payload = array(
+			'wp_ajax_url' => admin_url( 'admin-ajax.php' ),
+			'_nonce'      => wp_create_nonce( NMSP_PLUGIN_NONCE ),
+		);
+		wp_localize_script( 'nmsp-plugin-name-admin-js', 'nmspPluginAdminApi', $payload );
+	}
+
+}
+
+new Settings();

admin/index.php

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+<?php // silence is golden