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;
}

$subject_link = elgg_view('output/url', [
    'href' => $subject->getURL(),
    'text' => $subject->getDisplayName(),
    'class' => 'elgg-river-subject',
    'is_trusted' => true,
]);

$target_link = elgg_view('output/url', [
    'href' => $comment->getURL(),
    'text' => $target->getDisplayName(),
    'class' => 'elgg-river-target',
    'is_trusted' => true,
]);

$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 = $try_key;
        break;
    }
}
// try the old translation keys
if ($key === false) {
    $deprecated_keys = [
        "river:comment:$type:$subtype",
        "river:comment:$type:default",
    ];
    foreach ($deprecated_keys as $try_key) {
        if (elgg_language_key_exists($try_key)) {
            $key = $try_key;
            
            $notice = "Please update your river language key: '{$try_key}', suggested new key 'river:$type:$subtype:comment'.";
            $notice .= " See views/default/river/object/comment/create";
            elgg_deprecated_notice($notice, '3.0');
            break;
        }
    }
}

if ($key !== false) {
    $vars['summary'] = elgg_echo($key, [$subject_link, $target_link]);
}

$message = elgg_get_excerpt($comment->description);
if (substr($message, -3) === '...') {
    $message .= elgg_view('output/url', [
        'text' => elgg_echo('read_more'),
        'href' => $comment->getURL(),
        'is_trusted' => true,
        'class' => 'mls',
    ]);
}

$vars['message'] = $message;

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