shimmie2/ext/relationships/theme.php

<?php declare(strict_types=1);

class RelationshipsTheme extends Themelet
{
    public function relationship_info(Image $image)
    {
        global $page, $database;

        if ($image->parent_id !== null) {
            $a = "<a href='".make_link("post/view/".$image->parent_id)."'>parent post</a>";
            $page->add_block(new Block(null, "This post belongs to a $a.", "main", 5));
        }

        if (bool_escape($image->has_children)) {
            $ids = $database->get_col("SELECT id FROM images WHERE parent_id = :iid", ["iid"=>$image->id]);

            $html = "This post has <a href='".make_link('post/list/parent='.$image->id.'/1')."'>".(count($ids) > 1 ? "child posts" : "a child post")."</a>";
            $html .= " (post ";
            foreach ($ids as $id) {
                $html .= "#<a href='".make_link('post/view/'.$id)."'>{$id}</a>, ";
            }
            $html = rtrim($html, ", ").").";

            $page->add_block(new Block(null, $html, "main", 6));
        }
    }

    public function get_parent_editor_html(Image $image): string
    {
        global $user;

        $h_parent_id = $image->parent_id;
        $s_parent_id = $h_parent_id ?: "None";

        $html = "<tr>\n".
                "	<th>Parent</th>\n".
                "	<td>\n".
                (
                    !$user->is_anonymous() ?
                    "		<span class='view' style='overflow: hidden; white-space: nowrap;'>{$s_parent_id}</span>\n".
                    "		<input class='edit' type='number' name='tag_edit__parent' type='number' value='{$h_parent_id}'>\n"
                :
                    $s_parent_id
                ).
                "	<td>\n".
                "</tr>\n";
        return $html;
    }


    public function get_help_html()
    {
        return '<p>Search for images that have parent/child relationships.</p>
        <div class="command_example">
        <pre>parent=any</pre>
        <p>Returns images that have a parent.</p>
        </div> 
        <div class="command_example">
        <pre>parent=none</pre>
        <p>Returns images that have no parent.</p>
        </div> 
        <div class="command_example">
        <pre>parent=123</pre>
        <p>Returns images that have image 123 set as parent.</p>
        </div> 
        <div class="command_example">
        <pre>child=any</pre>
        <p>Returns images that have at least 1 child.</p>
        </div> 
        <div class="command_example">
        <pre>child=none</pre>
        <p>Returns images that have no children.</p>
        </div> 
        ';
    }
}