plugin_text_file.php

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<?php

elgg_set_context('admin');

$plugin_id = elgg_extract('plugin_id', $vars);
$plugin = elgg_get_plugin_from_id($plugin_id);

$filename = elgg_extract('filename', $vars);

elgg_unregister_external_file('css', 'elgg');
elgg_require_js('elgg/admin');

if (!$plugin) {
    $error = elgg_echo('admin:plugins:markdown:unknown_plugin');
    $body = elgg_view_layout('admin', [
        'content' => $error,
        'title' => $error,
    ]);
    echo elgg_view_page($error, $body, 'admin');
    return true;
}

$file_contents = false;
if (in_array($filename, \ElggPlugin::ADDITIONAL_TEXT_FILES)) {
    $file_contents = file_get_contents($plugin->getPath() . $filename);
}

if (!$file_contents) {
    $error = elgg_echo('admin:plugins:markdown:unknown_file');
    $body = elgg_view_layout('admin', ['content' => $error, 'title' => $error]);
    echo elgg_view_page($error, $body, 'admin');
    return true;
}

$title = $plugin->getDisplayName() . ": $filename";

use \Michelf\MarkdownExtra;
$text = MarkdownExtra::defaultTransform($file_contents);

$body = elgg_view_layout('admin', [
    // setting classes here because there's no way to pass classes
    // to the layout
    'content' => elgg_format_element('div', ['class' => 'elgg-markdown'], $text),
    'title' => $title,
    'filter_id' => 'admin/plugin_text_file',
    'filter_value' => "{$plugin_id}/{$filename}",
]);

echo elgg_view_page($title, $body, 'admin');