SPIKE Find and replace for SilverStripe

SimpsonsAdmin.php

<?php

use SilverStripe\Admin\LeftAndMain;
use SilverStripe\CMS\Model\SiteTree;
use SilverStripe\Control\HTTPRequest;
use SilverStripe\Control\HTTPResponse_Exception;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\Form;
use SilverStripe\Forms\FormAction;
use SilverStripe\Forms\TextField;
use SilverStripe\ORM\ArrayList;
use SilverStripe\ORM\FieldType\DBField;
use SilverStripe\View\ArrayData;
use SilverStripe\View\Parsers\Diff;
use SilverStripe\View\Requirements;
use SilverStripe\View\SSViewer;

class SimpsonsAdmin extends LeftAndMain
{
    private static $menu_title = 'Simpsons';

    private static $url_segment = 'springidled';

    private static $allowed_actions = [
        'SearchForm',
        'accept',
    ];

    protected function init()
    {
        parent::init();
        Requirements::css('silverstripe/cms: client/dist/styles/bundle.css');
    }

    /**
     * @return Form
     */
    public function SearchForm()
    {
        return Form::create(
            $this,
            __FUNCTION__,
            FieldList::create(
                TextField::create('q', 'Find'),
                TextField::create('r', 'Replace')
            ),
            FieldList::create(
                FormAction::create('', 'Go!')
            )
        )->setFormMethod('GET')->setFormAction($this->Link(''))
            ->loadDataFrom($this->getRequest()->getVars());
    }

    /**
     * @param array $data
     * @param Form $form
     * @param HTTPRequest $request
     */
    public function doSearch($data, $form, $request)
    {
        $this->getResponse()->addHeader('Content-Type', 'text/plain');
        $data = $form->getData();
        //find all records with search term
        $list = SiteTree::get();
        $filter = [];
        foreach (['Title', 'Content'] as $column) {
            $filter[$column . ':PartialMatch'] = $data['q'];
        }
        $list = $list->filterAny($filter);
        $this->getResponse()->setBody(var_export($list->toArray(), true));
        return $this->getResponse();
    }

    protected function getPagesByMatch($query)
    {
        $list = SiteTree::get();
        $filter = [];
        foreach (['Title', 'Content'] as $column) {
            $filter[$column . ':PartialMatch'] = $query;
        }
        return $list->filterAny($filter);
    }

    public function ListView()
    {
        $data = $this->getRequest()->getVars();
        if (empty($data['q'])) {
            return;
        }
        //find all records with search term
        $list = $this->getPagesByMatch($data['q']);
        $results = [];
        foreach ($list as $result) {
            $results[] = ArrayData::create([
                'Title' => DBField::create_field('HTMLFragment', Diff::compareHTML($result->Title, str_ireplace($data['q'], $data['r'], $result->Title))),
                'Content' => DBField::create_field('HTMLFragment', Diff::compareHTML($result->Content, str_ireplace($data['q'], $data['r'], $result->Content))),
                'Link' => static::join_links($this->Link('accept/' . $result->ID), '?' . http_build_query([
                    'q' => $data['q'],
                    'r' => $data['r'],
                ])),
                'CMSEditLink' => $result->CMSEditLink(),
            ]);
        }
        $response = SSViewer::execute_template('SimpsonsAdmin_Results', ArrayData::create(['Results' => ArrayList::create($results)]));
        return $response;
    }

    /**
     * @param HTTPRequest $request
     * @throws HTTPResponse_Exception
     */
    public function accept($request)
    {
        $id = $request->latestParam('ID');
        $query = $request->getVar('q');
        $replace = $request->getVar('r');
        if (!$id || !($page = SiteTree::get()->byID($id))) {
            throw new HTTPResponse_Exception('', 404);
        }
        foreach (['Title', 'Content'] as $field) {
            $page->$field = str_ireplace($query, $replace, $page->$field);
        }
        $page->write();
        return $this->redirectBack();
    }

}

SimpsonsAdmin_Content.ss

<div class="cms-content flexbox-area-grow fill-width fill-height $BaseCSSClasses" data-layout-type="border" data-pjax-fragment="Content">

    <div class="cms-content-tools fill-height cms-panel cms-panel-layout">
        <div class="flexbox-area-grow panel--scrollable cms-panel-content">
            $SearchForm
        </div>
    </div>
    <div class="fill-height flexbox-area-grow CMSPageHistoryController panel panel--padded panel--scrollable flexbox-area-grow cms-content-fields">
        $ListView
    </div>

</div>

SimpsonsAdmin_Results.ss

<h1>Results</h1>

<% if not $Results %>
    <h2>Sorry, there are no results for your search</h2>
<% else %>
<table>
    <thead>
        <tr>
            <th>Title</th>
            <th>Content</th>
            <th></th>
        </tr>
    </thead>
    <tbody>
    <% loop $Results %>
        <tr>
            <td>$Title</td>
            <td>$Content</td>
            <td><a href="$Link">Accept</a> / <a href="$CMSEditLink">Amend</a></td>
        </tr>
    <% end_loop %>
    </tbody>
</table>
<% end_if %>