Work on #463: added shutdown hook script to provide option of using X…

…ML instead of CSV as Migrate Plus input.

extras/scripts/shutdownhooks/concatentate_xml_files.php

@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * Shutdown hook script for MIK that combines all the XML files
+ * in an output directory into one big XML file. Useful for preparing
+ * content for importing in Drupal 8 using Migrate Plus.
+ */
+
+$config_path = trim($argv[1]);
+$config = parse_ini_file($config_path, TRUE);
+$temp_dir = $config['FETCHER']['temp_directory'];
+
+$wrapper_element_name = 'migrate_plus_source';
+
+$dir = $config['WRITER']['output_directory'];
+$dir = rtrim($dir, DIRECTORY_SEPARATOR);
+$xml_files = glob($dir . '/*.xml');
+
+$output_file_path_temp = $dir . '/metadata.temp';
+$output_file_path = $dir . '/metadata.xml';
+
+file_put_contents($output_file_path_temp, '<?xml version="1.0"?>' . "\n" .'<' . $wrapper_element_name . '>' . "\n");
+
+foreach ($xml_files as $xml_file_path) {
+    $dom = new DOMDocument();
+    $dom->preserveWhiteSpace = false;
+    $dom->load($xml_file_path);
+    $dom->formatOutput = true;
+    $xml_file_content = $dom->saveXML($dom->documentElement);
+    file_put_contents($output_file_path_temp, $xml_file_content . "\n", FILE_APPEND);
+    unlink($xml_file_path);
+}
+
+file_put_contents($output_file_path_temp, '</' . $wrapper_element_name . '>', FILE_APPEND);
+rename($output_file_path_temp, $output_file_path);