function compareversions()
{
$id = $this->request->param('ID') ? $this->request->param('ID') : $this->request->requestVar('ID');
$versions = $this->request->requestVar('Versions');
$version1 = $versions && isset($versions[0]) ? $versions[0] : $this->request->getVar('From');
$version2 = $versions && isset($versions[1]) ? $versions[1] : $this->request->getVar('To');
if ($version1 > $version2) {
$toVersion = $version1;
$fromVersion = $version2;
} else {
$toVersion = $version2;
$fromVersion = $version1;
}
if (!$toVersion || !$toVersion) {
return false;
}
$page = DataObject::get_by_id("SiteTree", $id);
if ($page && !$page->canView()) {
return Security::permissionFailure($this);
}
$record = $page->compareVersions($fromVersion, $toVersion);
$fromVersionRecord = Versioned::get_version('SiteTree', $id, $fromVersion);
$toVersionRecord = Versioned::get_version('SiteTree', $id, $toVersion);
if (!$fromVersionRecord) {
user_error("Can't find version {$fromVersion} of page {$id}", E_USER_ERROR);
}
if (!$toVersionRecord) {
user_error("Can't find version {$toVersion} of page {$id}", E_USER_ERROR);
}
if ($record) {
$fromDateNice = $fromVersionRecord->obj('LastEdited')->Ago();
$toDateNice = $toVersionRecord->obj('LastEdited')->Ago();
$fromAuthor = DataObject::get_by_id('Member', $fromVersionRecord->AuthorID);
if (!$fromAuthor) {
$fromAuthor = new ArrayData(array('Title' => 'Unknown author'));
}
$toAuthor = DataObject::get_by_id('Member', $toVersionRecord->AuthorID);
if (!$toAuthor) {
$toAuthor = new ArrayData(array('Title' => 'Unknown author'));
}
$fields = $record->getCMSFields($this);
$fields->push(new HiddenField("ID"));
$fields->push(new HiddenField("Version"));
$fields->insertBefore(new LiteralField('YouAreComparingHeader', '<p class="message notice">' . sprintf(_t('CMSMain.COMPARINGV', "Comparing versions %s and %s"), "<a href=\"admin/getversion/{$id}/{$fromVersionRecord->Version}\" title=\"{$fromAuthor->Title}\">{$fromVersionRecord->Version}</a> <small>({$fromDateNice})</small>", "<a href=\"admin/getversion/{$id}/{$toVersionRecord->Version}\" title=\"{$toAuthor->Title}\">{$toVersionRecord->Version}</a> <small>({$toDateNice})</small>") . '</p>'), "Root");
$actions = new FieldSet();
$form = new Form($this, "EditForm", $fields, $actions);
$form->loadDataFrom($record);
$form->loadDataFrom(array("ID" => $id, "Version" => $fromVersion));
// comparison views shouldn't be editable
$readonlyFields = $form->Fields()->makeReadonly();
$form->setFields($readonlyFields);
foreach ($form->Fields()->dataFields() as $field) {
$field->dontEscape = true;
}
if ($this->isAjax()) {
return $form->formHtmlContent();
} else {
$templateData = $this->customise(array("EditForm" => $form));
return $templateData->renderWith('LeftAndMain');
}
}
}
