add Git Updater Lite based updater for packages (#131)

inc/namespace.php

@@ -36,6 +36,7 @@ function bootstrap() {
 	Pings\bootstrap();
 	Salts\bootstrap();
 	Settings\bootstrap();
+	Updater\bootstrap();
 	User_Notification\bootstrap();
 	Version_Check\bootstrap();
 

inc/updater/namespace.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace FAIR\Updater;
+
+use Fragen\Git_Updater;
+
+/**
+ * Exit if called directly.
+ */
+if ( ! defined( 'WPINC' ) ) {
+	die;
+}
+
+/**
+ * Bootstrap.
+ */
+function bootstrap() {
+	add_action( 'init', __NAMESPACE__ . '\\init' );
+}
+
+/**
+ * Gather all plugins/themes with data in Update URI and DID header.
+ *
+ * @return stdClass
+ */
+function init() {
+	/** @var array */
+	$package_arr = [];
+
+	// Seems to be required for PHPUnit testing on GitHub workflow.
+	if ( ! function_exists( 'get_plugins' ) ) {
+		require_once ABSPATH . 'wp-admin/includes/plugin.php';
+	}
+
+	$plugin_path = trailingslashit( WP_PLUGIN_DIR );
+	$plugins     = get_plugins();
+	foreach ( $plugins as $file => $plugin ) {
+		if ( empty( $plugin['UpdateURI'] ) ) {
+			continue;
+		}
+		$plugin_id = get_file_data( $plugin_path . $file, [ 'PluginID' => 'Plugin ID' ] )['PluginID'];
+
+		if ( ! empty( $plugin_id ) ) {
+			$package_arr[] = $plugin_path . $file;
+		}
+	}
+
+	$theme_path = WP_CONTENT_DIR . '/themes/';
+	$themes     = wp_get_themes();
+	foreach ( $themes as $file => $theme ) {
+		if ( empty( $theme->get( 'UpdateURI' ) ) ) {
+			continue;
+		}
+		$theme_id = get_file_data( $theme_path . $file . '/style.css', [ 'ThemeID' => 'Theme ID' ] )['ThemeID'];
+
+		if ( ! empty( $theme_id ) ) {
+			$package_arr[] = $theme_path . $file . '/style.css';
+		}
+	}
+
+	run( $package_arr );
+}
+
+/**
+ * Run Git Updater Lite for potential packages.
+ *
+ * @return void
+ */
+function run( $package_arr ) {
+	foreach ( $package_arr as $package ) {
+		( new Git_Updater\Lite( $package ) )->run();
+	}
+}

plugin.php

@@ -31,6 +31,7 @@ require_once __DIR__ . '/inc/importers/namespace.php';
 require_once __DIR__ . '/inc/pings/namespace.php';
 require_once __DIR__ . '/inc/salts/namespace.php';
 require_once __DIR__ . '/inc/settings/namespace.php';
+require_once __DIR__ . '/inc/updater/namespace.php';
 require_once __DIR__ . '/inc/user-notification/namespace.php';
 require_once __DIR__ . '/inc/version-check/namespace.php';