summary.php

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<?php
$item = $vars['item'];

$subject = $item->getSubjectEntity();
$object = $item->getObjectEntity();

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

$object_text = $object->title ? $object->title : $object->name;
$object_link = elgg_view('output/url', array(
    'href' => $object->getURL(),
    'text' => elgg_get_excerpt($object_text, 100),
    'class' => 'elgg-river-object',
    'is_trusted' => true,
));

$action = $item->action_type;
$type = $item->type;
$subtype = $item->subtype ? $item->subtype : 'default';

// check summary translation keys.
// will use the $type:$subtype if that's defined, otherwise just uses $type:default
$key = "river:$action:$type:$subtype";
$summary = elgg_echo($key, array($subject_link, $object_link));

if ($summary == $key) {
    $key = "river:$action:$type:default";
    $summary = elgg_echo($key, array($subject_link, $object_link));
}

echo $summary;