create.php

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<?php
$item = elgg_extract('item', $vars);
if (!$item instanceof ElggRiverItem) {
    return;
}

$comment = $item->getObjectEntity();
if (!$comment instanceof ElggComment) {
    return;
}

$subject = $item->getSubjectEntity();
$target = $item->getTargetEntity();

if (!$subject instanceof ElggEntity || !$target instanceof ElggEntity) {
    return;
}

$type = $target->getType();
$subtype = $target->getSubtype() ? $target->getSubtype() : 'default';

$key = false;
$keys = [
    "river:$type:$subtype:comment",
    "river:$type:default:comment",
];
foreach ($keys as $try_key) {
    if (elgg_language_key_exists($try_key)) {
        $key = $try_key;
        break;
    }
}

if ($key !== false) {
    $subject_link = elgg_view_entity_url($subject, ['class' => 'elgg-river-subject']);
    $target_link = elgg_view_url($comment->getURL(), $target->getDisplayName(), ['class' => 'elgg-river-target']);
    
    $vars['summary'] = elgg_echo($key, [$subject_link, $target_link]);
}

$message = elgg_get_excerpt($comment->description);
if (elgg_substr($message, -3) === '...') {
    $message .= elgg_view_url($comment->getURL(), elgg_echo('read_more'), ['class' => 'mls']);
}

$vars['message'] = $message;

echo elgg_view('river/elements/layout', $vars);