prepopulate_hide.module

<?php
use Drupal\Core\Form\FormStateInterface;

/**
 * Implements hook_form_alter().
 */
function prepopulate_hide_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (prepopulate_hide_form_is_included($form_id)) {
    $form['#after_build'][] = 'prepopulate_hide_after_build';
  }

  $config = \Drupal::config('prepopulate_hide.settings');

  $newLines = '/(\r\n|\r|\n)/';

  $prepopulateFields = preg_split($newLines, $config->get('prepopulate_from_current_page'));

  foreach ($prepopulateFields as $prepopulateField) {
    list($formId, $fieldName) = explode('|', $prepopulateField);

    if ($formId == $form_id) {
      $node_id = \Drupal::routeMatch()->getRawParameter('node');
      if (!empty($node_id)) {
        $form[$fieldName]['widget']['#default_value'] = $node_id;
      }
    }
  }
}

function prepopulate_hide_after_build($form) {
  $config = \Drupal::config('prepopulate_hide.settings');

  $newLines = '/(\r\n|\r|\n)/';

  $includedFields = preg_split($newLines, $config->get('included_fields'));

  foreach ($includedFields as $fieldName) {
    if (isset($form[$fieldName])) {

      if (isset($form[$fieldName]['widget']['#value']) && !empty($form[$fieldName]['widget']['#value'])) {
        $form[$fieldName]['widget']['#access'] = FALSE;
      }
    }
  }

  return $form;
}

function prepopulate_hide_form_is_included($form_id) {
  $config = \Drupal::config('prepopulate_hide.settings');

  $newLines = '/(\r\n|\r|\n)/';

  $includedForms = preg_split($newLines, $config->get('included_forms'));
  $excludedForms = preg_split($newLines, $config->get('excluded_forms'));

  $include = FALSE;

  foreach ($includedForms as $search) {
    $search = trim($search);

    if (!$search) {
      continue;
    }

    if (strpos($search, '/') === 0) {
      if (preg_match($search, $form_id)) {
        $include = TRUE;

        break;
      }
    } elseif ($form_id == $search) {
      $include = TRUE;

      break;
    }
  }

  if ($include && !empty($excludedForms)) {
    foreach ($excludedForms as $search) {
      if (strpos($search, '/') === 0) {
        if (preg_match($search, $form_id)) {
          $include = FALSE;

          break;
        }
      } elseif ($form_id == $search) {
        $include = FALSE;

        break;
      }
    }
  }

  return $include;
}