WIP.

idc_migration.info.yml

@@ -3,4 +3,5 @@ type: module
 description: 'Custom migration plugins supporting IDC ingest'
 core: 8.x
 dependencies:
-  - migrate
+  - drupal:migrate
+  - migrate_source_csv:migrate_source_csv

idc_migration.module

@@ -2,4 +2,4 @@
 /**
 * @file
 * A description of what your module does.
-*/
+*/

idc_migration.services.yml

@@ -0,0 +1,6 @@
+---
+services:
+  idc_defaults.route_subscriber:
+    class: Drupal\idc_migration\Routing\RouteSubscriber
+    tags:
+      - name: event_subscriber

src/Form/MigrateSourceUiForm.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Drupal\idc_migration\Form;
+
+use Drupal\Core\Form\FormStateInterface;
+
+use Drupal\idc_migration\MigrateBatchExecutable;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate_source_ui\Form\MigrateSourceUiForm as MigrateSourceUiFormBase;
+use Drupal\migrate_source_ui\StubMigrationMessage;
+
+/**
+ * Slightly extended migration execution form.
+ */
+class MigrateSourceUiForm extends MigrateSourceUiFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $migration_id = $form_state->getValue('migrations');
+    /** @var \Drupal\migrate\Plugin\Migration $migration */
+    $migration = $this->pluginManagerMigration->createInstance($migration_id);
+
+    // Reset status.
+    $status = $migration->getStatus();
+    if ($status !== MigrationInterface::STATUS_IDLE) {
+      $migration->setStatus(MigrationInterface::STATUS_IDLE);
+      $this->messenger()->addWarning($this->t('Migration @id reset to Idle', ['@id' => $migration_id]));
+    }
+
+    $options = [];
+
+    // Prepare the migration with the path injected.
+    $definition = $this->pluginManagerMigration->getDefinition($migration_id);
+    // Override the file path.
+    $definition['source']['path'] = $form_state->getValue('file_path');
+    /** @var \Drupal\migrate\Plugin\MigrationInterface $migration */
+    $migration = $this->pluginManagerMigration->createStubMigration($definition);
+
+    // Force updates or not.
+    if ($form_state->getValue('update_existing_records')) {
+      $migration->getIdMap()->prepareUpdate();
+    }
+
+    $executable = new MigrateBatchExecutable($migration, new StubMigrationMessage(), $options);
+    batch_set($executable->prepareBatch());
+  }
+
+}