From 3a837ef6bb8445ba8e944741d6f00f763c12e714 Mon Sep 17 00:00:00 2001
From: Daniel Weipert <git@mail.dweipert.de>
Date: Fri, 7 Jun 2024 21:48:12 +0200
Subject: initial commit

---
 src/Columns.php  | 234 ++++++++++++++++++++++++
 src/PostType.php | 535 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/Taxonomy.php | 376 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 1145 insertions(+)
 create mode 100644 src/Columns.php
 create mode 100644 src/PostType.php
 create mode 100644 src/Taxonomy.php

(limited to 'src')

diff --git a/src/Columns.php b/src/Columns.php
new file mode 100644
index 0000000..51f0cd7
--- /dev/null
+++ b/src/Columns.php
@@ -0,0 +1,234 @@
+<?php
+
+namespace PostTypes;
+
+/**
+ * Columns
+ *
+ * Used to help manage a post types columns in the admin table
+ */
+class Columns
+{
+    /**
+     * Holds an array of all the defined columns.
+     *
+     * @var array
+     */
+    public $items = [];
+
+    /**
+     * An array of columns to add.
+     *
+     * @var array
+     */
+    public $add = [];
+
+    /**
+     * An array of columns to hide.
+     *
+     * @var array
+     */
+    public $hide = [];
+
+    /**
+     * An array of columns to reposition.
+     *
+     * @var array
+     */
+    public $positions = [];
+
+    /**
+     * An array of custom populate callbacks.
+     *
+     * @var array
+     */
+    public $populate = [];
+
+    /**
+     * An array of columns that are sortable.
+     *
+     * @var array
+     */
+    public $sortable = [];
+
+    /**
+     * Set the all columns
+     * @param array $columns an array of all the columns to replace
+     */
+    public function set($columns)
+    {
+        $this->items = $columns;
+    }
+
+    /**
+     * Add a new column
+     * @param string  $column   the slug of the column
+     * @param string  $label    the label for the column
+     */
+    public function add($columns, $label = null)
+    {
+
+        if (!is_array($columns)) {
+            $columns = [$columns => $label];
+        }
+
+        foreach ($columns as $column => $label) {
+            if (is_null($label)) {
+                $label = str_replace(['_', '-'], ' ', ucfirst($column));
+            }
+
+            $this->add[$column] = $label;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add a column to hide
+     * @param  string $column the slug of the column to hdie
+     */
+    public function hide($columns)
+    {
+        if (!is_array($columns)) {
+            $columns = [$columns];
+        }
+
+        foreach ($columns as $column) {
+            $this->hide[] = $column;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Set a custom callback to populate a column
+     * @param  string $column   the column slug
+     * @param  mixed  $callback callback function
+     */
+    public function populate($column, $callback)
+    {
+        $this->populate[$column] = $callback;
+
+        return $this;
+    }
+
+    /**
+     * Define the postion for a columns
+     * @param  string  $columns  an array of columns
+     */
+    public function order($columns)
+    {
+        foreach ($columns as $column => $position) {
+            $this->positions[$column] = $position;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Set columns that are sortable
+     * @param  string  $column     the slug of the column
+     * @param  string  $meta_value the meta_value to orderby
+     * @param  boolean $is_num     whether to order by string/number
+     */
+    public function sortable($sortable)
+    {
+        foreach ($sortable as $column => $options) {
+            $this->sortable[$column] = $options;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Check if an orderby field is a custom sort option.
+     * @param  string  $orderby  the orderby value from query params
+     */
+    public function isSortable($orderby)
+    {
+        if (is_string($orderby) && array_key_exists($orderby, $this->sortable)) {
+            return true;
+        }
+
+        foreach ($this->sortable as $column => $options) {
+            if (is_string($options) && $options === $orderby) {
+                return true;
+            }
+            if (is_array($options) && isset($options[0]) && $options[0] === $orderby) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Get meta key for an orderby.
+     * @param  string  $orderby  the orderby value from query params
+     */
+    public function sortableMeta($orderby)
+    {
+        if (array_key_exists($orderby, $this->sortable)) {
+            return $this->sortable[$orderby];
+        }
+
+        foreach ($this->sortable as $column => $options) {
+            if (is_string($options) && $options === $orderby) {
+                return $options;
+            }
+            if (is_array($options) && isset($options[0]) && $options[0] === $orderby) {
+                return $options;
+            }
+        }
+
+        return '';
+    }
+
+    /**
+     * Modify the columns for the object
+     * @param  array  $columns WordPress default columns
+     * @return array           The modified columns
+     */
+    public function modifyColumns($columns)
+    {
+        // if user defined set columns, return those
+        if (!empty($this->items)) {
+            return $this->items;
+        }
+
+        // add additional columns
+        if (!empty($this->add)) {
+            foreach ($this->add as $key => $label) {
+                $columns[$key] = $label;
+            }
+        }
+
+        // unset hidden columns
+        if (!empty($this->hide)) {
+            foreach ($this->hide as $key) {
+                unset($columns[$key]);
+            }
+        }
+
+        // if user has made added custom columns
+        if (!empty($this->positions)) {
+            foreach ($this->positions as $key => $position) {
+                // find index of the element in the array
+                $index = array_search($key, array_keys($columns));
+                // retrieve the element in the array of columns
+                $item = array_slice($columns, $index, 1);
+                // remove item from the array
+                unset($columns[$key]);
+
+                // split columns array into two at the desired position
+                $start = array_slice($columns, 0, $position, true);
+                $end = array_slice($columns, $position, count($columns) - 1, true);
+
+                // insert column into position
+                $columns = $start + $item + $end;
+            }
+        }
+
+        return $columns;
+    }
+}
diff --git a/src/PostType.php b/src/PostType.php
new file mode 100644
index 0000000..97edc02
--- /dev/null
+++ b/src/PostType.php
@@ -0,0 +1,535 @@
+<?php
+
+namespace PostTypes;
+
+use PostTypes\Columns;
+
+/**
+ * PostType
+ */
+class PostType
+{
+    /**
+     * The names passed to the PostType
+     * @var array
+     */
+    public $names;
+
+    /**
+     * The name for the PostType
+     * @var string
+     */
+    public $name;
+
+    /**
+     * The singular for the PostType
+     * @var string
+     */
+    public $singular;
+
+    /**
+     * The plural name for the PostType
+     * @var string
+     */
+    public $plural;
+
+    /**
+     * The slug for the PostType
+     * @var string
+     */
+    public $slug;
+
+    /**
+     * Options for the PostType
+     * @var array
+     */
+    public $options;
+
+    /**
+     * Labels for the PostType
+     * @var array
+     */
+    public $labels;
+
+    /**
+     * Taxonomies for the PostType
+     * @var array
+     */
+    public $taxonomies = [];
+
+    /**
+     * Filters for the PostType
+     * @var mixed
+     */
+    public $filters;
+
+    /**
+     * The menu icon for the PostType
+     * @var string
+     */
+    public $icon;
+
+    /**
+     * The column manager for the PostType
+     * @var mixed
+     */
+    public $columns;
+
+    /**
+     * Create a PostType
+     * @param mixed $names   A string for the name, or an array of names
+     * @param array $options An array of options for the PostType
+     */
+    public function __construct($names, $options = [], $labels = [])
+    {
+        // assign names to the PostType
+        $this->names($names);
+
+        // assign custom options to the PostType
+        $this->options($options);
+
+        // assign labels to the PostType
+        $this->labels($labels);
+    }
+
+    /**
+     * Set the names for the PostType
+     * @param  mixed $names A string for the name, or an array of names
+     * @return $this
+     */
+    public function names($names)
+    {
+        // only the post type name is passed
+        if (is_string($names)) {
+            $names = ['name' => $names];
+        }
+
+        // set the names array
+        $this->names = $names;
+
+        // create names for the PostType
+        $this->createNames();
+
+        return $this;
+    }
+
+    /**
+     * Set the options for the PostType
+     * @param  array $options An array of options for the PostType
+     * @return $this
+     */
+    public function options(array $options)
+    {
+        $this->options = $options;
+
+        return $this;
+    }
+
+    /**
+     * Set the labels for the PostType
+     * @param  array $labels An array of labels for the PostType
+     * @return $this
+     */
+    public function labels(array $labels)
+    {
+        $this->labels = $labels;
+
+        return $this;
+    }
+
+    /**
+     * Add a Taxonomy to the PostType
+     * @param  mixed $taxonomies The Taxonomy name(s) to add
+     * @return $this
+     */
+    public function taxonomy($taxonomies)
+    {
+        $taxonomies = is_string($taxonomies) ? [$taxonomies] : $taxonomies;
+
+        foreach ($taxonomies as $taxonomy) {
+            $this->taxonomies[] = $taxonomy;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Add filters to the PostType
+     * @param  array $filters An array of Taxonomy filters
+     * @return $this
+     */
+    public function filters(array $filters)
+    {
+        $this->filters = $filters;
+
+        return $this;
+    }
+
+    /**
+     * Set the menu icon for the PostType
+     * @param  string $icon A dashicon class for the menu icon
+     * @return $this
+     */
+    public function icon($icon)
+    {
+        $this->icon = $icon;
+
+        return $this;
+    }
+
+    /**
+     * Flush rewrite rules
+     * @link https://codex.wordpress.org/Function_Reference/flush_rewrite_rules
+     * @param  boolean $hard
+     * @return void
+     */
+    public function flush($hard = true)
+    {
+        flush_rewrite_rules($hard);
+    }
+
+    /**
+     * Get the Column Manager for the PostType
+     * @return PostTypes\Columns
+     */
+    public function columns()
+    {
+        if (!isset($this->columns)) {
+            $this->columns = new Columns;
+        }
+
+        return $this->columns;
+    }
+
+    /**
+     * Register the PostType to WordPress
+     * @return void
+     */
+    public function register()
+    {
+        // register the PostType
+        if (!post_type_exists($this->name)) {
+            add_action('init', [$this, 'registerPostType']);
+        } else {
+            add_filter('register_post_type_args', [$this, 'modifyPostType'], 10, 2);
+        }
+
+        // register Taxonomies to the PostType
+        add_action('init', [$this, 'registerTaxonomies']);
+
+        // modify filters on the admin edit screen
+        add_action('restrict_manage_posts', [$this, 'modifyFilters']);
+
+        if (isset($this->columns)) {
+            // modify the admin edit columns.
+            add_filter("manage_{$this->name}_posts_columns", [$this, 'modifyColumns'], 10, 1);
+
+            // populate custom columns
+            add_filter("manage_{$this->name}_posts_custom_column", [$this, 'populateColumns'], 10, 2);
+
+            // run filter to make columns sortable.
+            add_filter('manage_edit-'.$this->name.'_sortable_columns', [$this, 'setSortableColumns']);
+
+            // run action that sorts columns on request.
+            add_action('pre_get_posts', [$this, 'sortSortableColumns']);
+        }
+    }
+
+    /**
+     * Register the PostType
+     * @return void
+     */
+    public function registerPostType()
+    {
+        // create options for the PostType
+        $options = $this->createOptions();
+
+        // check that the post type doesn't already exist
+        if (!post_type_exists($this->name)) {
+            // register the post type
+            register_post_type($this->name, $options);
+        }
+    }
+
+    /**
+     * Modify the existing Post Type.
+     *
+     * @return array
+     */
+    public function modifyPostType(array $args, string $posttype)
+    {
+        if ($posttype !== $this->name) {
+            return $args;
+        }
+
+        // create options for the PostType
+        $options = $this->createOptions();
+
+        $args = array_replace_recursive($args, $options);
+
+        return $args;
+    }
+
+    /**
+     * Create the required names for the PostType
+     * @return void
+     */
+    public function createNames()
+    {
+        // names required for the PostType
+        $required = [
+            'name',
+            'singular',
+            'plural',
+            'slug',
+        ];
+
+        foreach ($required as $key) {
+            // if the name is set, assign it
+            if (isset($this->names[$key])) {
+                $this->$key = $this->names[$key];
+                continue;
+            }
+
+            // if the key is not set and is singular or plural
+            if (in_array($key, ['singular', 'plural'])) {
+                // create a human friendly name
+                $name = ucwords(strtolower(str_replace(['-', '_'], ' ', $this->names['name'])));
+            }
+
+            if ($key === 'slug') {
+                // create a slug friendly name
+                $name = strtolower(str_replace([' ', '_'], '-', $this->names['name']));
+            }
+
+            // if is plural or slug, append an 's'
+            if (in_array($key, ['plural', 'slug'])) {
+                if (substr($name, strlen($name) - 1, 1) == "y") {
+                    $name = substr($name, 0, strlen($name) - 1) . "ies";
+                } else {
+                    $name .= 's';
+                }
+            }
+
+            // asign the name to the PostType property
+            $this->$key = $name;
+        }
+    }
+
+    /**
+     * Create options for PostType
+     * @return array Options to pass to register_post_type
+     */
+    public function createOptions()
+    {
+        // default options
+        $options = [
+            'public' => true,
+            'rewrite' => [
+                'slug' => $this->slug
+            ]
+        ];
+
+        // replace defaults with the options passed
+        $options = array_replace_recursive($options, $this->options);
+
+        // create and set labels
+        if (!isset($options['labels'])) {
+            $options['labels'] = $this->createLabels();
+        }
+
+        // set the menu icon
+        if (!isset($options['menu_icon']) && isset($this->icon)) {
+            $options['menu_icon'] = $this->icon;
+        }
+
+        return $options;
+    }
+
+    /**
+     * Create the labels for the PostType
+     * @return array
+     */
+    public function createLabels()
+    {
+        // default labels
+        $labels = [
+            'name' => $this->plural,
+            'singular_name' => $this->singular,
+            'menu_name' => $this->plural,
+            'all_items' => $this->plural,
+            'add_new' => "Erstellen",
+            'add_new_item' => "{$this->singular} erstellen",
+            'edit_item' => "{$this->singular} bearbeiten",
+            'new_item' => "{$this->singular} erstellen",
+            'view_item' => "{$this->singular} anschauen",
+            'search_items' => "{$this->plural} suchen",
+            'not_found' => "Kein {$this->plural} gefunden",
+            'not_found_in_trash' => "Es wurden keine {$this->plural} im Papierkorb gefunden.",
+            'parent_item_colon' => "Eltern-{$this->singular}:",
+        ];
+
+        return array_replace_recursive($labels, $this->labels);
+    }
+
+    /**
+     * Register Taxonomies to the PostType
+     * @return void
+     */
+    public function registerTaxonomies()
+    {
+        if (!empty($this->taxonomies)) {
+            foreach ($this->taxonomies as $taxonomy) {
+                register_taxonomy_for_object_type($taxonomy, $this->name);
+            }
+        }
+    }
+
+    /**
+     * Modify and display filters on the admin edit screen
+     * @param  string $posttype The current screen post type
+     * @return void
+     */
+    public function modifyFilters($posttype)
+    {
+        // first check we are working with the this PostType
+        if ($posttype === $this->name) {
+            // calculate what filters to add
+            $filters = $this->getFilters();
+
+            foreach ($filters as $taxonomy) {
+                // if the taxonomy doesn't exist, ignore it
+                if (!taxonomy_exists($taxonomy)) {
+                    continue;
+                }
+
+                // If the taxonomy is not registered to the post type, continue.
+                if (!is_object_in_taxonomy($this->name, $taxonomy)) {
+                    continue;
+                }
+
+                // get the taxonomy object
+                $tax = get_taxonomy($taxonomy);
+
+                // start the html for the filter dropdown
+                $selected = null;
+
+                if (isset($_GET[$taxonomy])) {
+                    $selected = sanitize_title($_GET[$taxonomy]);
+                }
+
+                $dropdown_args = [
+                    'name'            => $taxonomy,
+                    'value_field'     => 'slug',
+                    'taxonomy'        => $tax->name,
+                    'show_option_all' => $tax->labels->all_items,
+                    'hierarchical'    => $tax->hierarchical,
+                    'selected'        => $selected,
+                    'orderby'         => 'name',
+                    'hide_empty'      => 0,
+                    'show_count'      => 0,
+                ];
+
+                // Output screen reader label.
+                echo '<label class="screen-reader-text" for="cat">' . $tax->labels->filter_by_item . '</label>';
+
+                // Output dropdown for taxonomy.
+                wp_dropdown_categories($dropdown_args);
+            }
+        }
+    }
+
+    /**
+     * Calculate the filters for the PostType
+     * @return array
+     */
+    public function getFilters()
+    {
+        // default filters are empty
+        $filters = [];
+
+        // if custom filters have been set, use them
+        if (!is_null($this->filters)) {
+            return $this->filters;
+        }
+
+        // if no custom filters have been set, and there are
+        // Taxonomies assigned to the PostType
+        if (is_null($this->filters) && !empty($this->taxonomies)) {
+            // create filters for each taxonomy assigned to the PostType
+            return $this->taxonomies;
+        }
+
+        return $filters;
+    }
+
+    /**
+     * Modify the columns for the PostType
+     * @param  array  $columns  Default WordPress columns
+     * @return array            The modified columns
+     */
+    public function modifyColumns($columns)
+    {
+        $columns = $this->columns->modifyColumns($columns);
+
+        return $columns;
+    }
+
+    /**
+     * Populate custom columns for the PostType
+     * @param  string $column   The column slug
+     * @param  int    $post_id  The post ID
+     */
+    public function populateColumns($column, $post_id)
+    {
+        if (isset($this->columns->populate[$column])) {
+            call_user_func_array($this->columns()->populate[$column], [$column, $post_id]);
+        }
+    }
+
+    /**
+     * Make custom columns sortable
+     * @param array  $columns  Default WordPress sortable columns
+     */
+    public function setSortableColumns($columns)
+    {
+        if (!empty($this->columns()->sortable)) {
+            $columns = array_merge($columns, $this->columns()->sortable);
+        }
+
+        return $columns;
+    }
+
+    /**
+     * Set query to sort custom columns
+     * @param  WP_Query $query
+     */
+    public function sortSortableColumns($query)
+    {
+        // don't modify the query if we're not in the post type admin
+        if (!is_admin() || $query->get('post_type') !== $this->name) {
+            return;
+        }
+
+        $orderby = $query->get('orderby');
+
+        // if the sorting a custom column
+        if ($this->columns()->isSortable($orderby)) {
+            // get the custom column options
+            $meta = $this->columns()->sortableMeta($orderby);
+
+            // determine type of ordering
+            if (is_string($meta) or !$meta[1]) {
+                $meta_key = $meta;
+                $meta_value = 'meta_value';
+            } else {
+                $meta_key = $meta[0];
+                $meta_value = 'meta_value_num';
+            }
+
+            // set the custom order
+            $query->set('meta_key', $meta_key);
+            $query->set('orderby', $meta_value);
+        }
+    }
+}
diff --git a/src/Taxonomy.php b/src/Taxonomy.php
new file mode 100644
index 0000000..a7aca5b
--- /dev/null
+++ b/src/Taxonomy.php
@@ -0,0 +1,376 @@
+<?php
+
+namespace PostTypes;
+
+use PostTypes\Columns;
+
+/**
+ * Taxonomy
+ */
+class Taxonomy
+{
+    /**
+     * The names passed to the Taxonomy
+     * @var mixed
+     */
+    public $names;
+
+    /**
+     * The Taxonomy name
+     * @var string
+     */
+    public $name;
+
+    /**
+     * The singular label for the Taxonomy
+     * @var string
+     */
+    public $singular;
+
+    /**
+     * The plural label for the Taxonomy
+     * @var string
+     */
+    public $plural;
+
+    /**
+     * The Taxonomy slug
+     * @var string
+     */
+    public $slug;
+
+    /**
+     * Custom options for the Taxonomy
+     * @var array
+     */
+    public $options;
+
+    /**
+     * Custom labels for the Taxonomy
+     * @var array
+     */
+    public $labels;
+
+    /**
+     * PostTypes to register the Taxonomy to
+     * @var array
+     */
+    public $posttypes = [];
+
+    /**
+     * The column manager for the Taxonomy
+     * @var mixed
+     */
+    public $columns;
+
+    /**
+     * Create a Taxonomy
+     * @param mixed $names The name(s) for the Taxonomy
+     */
+    public function __construct($names, $options = [], $labels = [])
+    {
+        $this->names($names);
+
+        $this->options($options);
+
+        $this->labels($labels);
+    }
+
+    /**
+     * Set the names for the Taxonomy
+     * @param  mixed $names The name(s) for the Taxonomy
+     * @return $this
+     */
+    public function names($names)
+    {
+        if (is_string($names)) {
+            $names = ['name' => $names];
+        }
+
+        $this->names = $names;
+
+        // create names for the Taxonomy
+        $this->createNames();
+
+        return $this;
+    }
+
+    /**
+     * Set options for the Taxonomy
+     * @param  array $options
+     * @return $this
+     */
+    public function options(array $options = [])
+    {
+        $this->options = $options;
+
+        return $this;
+    }
+
+    /**
+     * Set the Taxonomy labels
+     * @param  array  $labels
+     * @return $this
+     */
+    public function labels(array $labels = [])
+    {
+        $this->labels = $labels;
+
+        return $this;
+    }
+
+    /**
+     * Assign a PostType to register the Taxonomy to
+     * @param  mixed $posttypes
+     * @return $this
+     */
+    public function posttype($posttypes)
+    {
+        $posttypes = is_string($posttypes) ? [$posttypes] : $posttypes;
+
+        foreach ($posttypes as $posttype) {
+            $this->posttypes[] = $posttype;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Get the Column Manager for the Taxonomy
+     * @return Columns
+     */
+    public function columns()
+    {
+        if (!isset($this->columns)) {
+            $this->columns = new Columns;
+        }
+
+        return $this->columns;
+    }
+
+    /**
+     * Register the Taxonomy to WordPress
+     * @return void
+     */
+    public function register()
+    {
+        // register the taxonomy, set priority to 9
+        // so taxonomies are registered before PostTypes
+        add_action('init', [$this, 'registerTaxonomy'], 9);
+
+        // assign taxonomy to post type objects
+        add_action('init', [$this, 'registerTaxonomyToObjects']);
+
+        if (isset($this->columns)) {
+            // modify the columns for the Taxonomy
+            add_filter("manage_edit-{$this->name}_columns", [$this, 'modifyColumns']);
+
+            // populate the columns for the Taxonomy
+            add_filter("manage_{$this->name}_custom_column", [$this, 'populateColumns'], 10, 3);
+
+            // set custom sortable columns
+            add_filter("manage_edit-{$this->name}_sortable_columns", [$this, 'setSortableColumns']);
+
+            // run action that sorts columns on request
+            add_action('parse_term_query', [$this, 'sortSortableColumns']);
+        }
+    }
+
+    /**
+     * Register the Taxonomy to WordPress
+     * @return void
+     */
+    public function registerTaxonomy()
+    {
+        // Get the existing taxonomy options if it exists.
+        $options = (taxonomy_exists($this->name)) ? (array) get_taxonomy($this->name) : [];
+
+        // create options for the Taxonomy.
+        $options = array_replace_recursive($options, $this->createOptions());
+
+        // register the Taxonomy with WordPress.
+        register_taxonomy($this->name, null, $options);
+    }
+
+    /**
+     * Register the Taxonomy to PostTypes
+     * @return void
+     */
+    public function registerTaxonomyToObjects()
+    {
+        // register Taxonomy to each of the PostTypes assigned
+        if (!empty($this->posttypes)) {
+            foreach ($this->posttypes as $posttype) {
+                register_taxonomy_for_object_type($this->name, $posttype);
+            }
+        }
+    }
+
+    /**
+     * Create names for the Taxonomy
+     * @return void
+     */
+    public function createNames()
+    {
+        $required = [
+            'name',
+            'singular',
+            'plural',
+            'slug',
+        ];
+
+        foreach ($required as $key) {
+            // if the name is set, assign it
+            if (isset($this->names[$key])) {
+                $this->$key = $this->names[$key];
+                continue;
+            }
+
+            // if the key is not set and is singular or plural
+            if (in_array($key, ['singular', 'plural'])) {
+                // create a human friendly name
+                $name = ucwords(strtolower(str_replace(['-', '_'], ' ', $this->names['name'])));
+            }
+
+            if ($key === 'slug') {
+                // create a slug friendly name
+                $name = strtolower(str_replace([' ', '_'], '-', $this->names['name']));
+            }
+
+            // if is plural or slug, append an 's'
+            if (in_array($key, ['plural', 'slug'])) {
+                $name .= 's';
+            }
+
+            // asign the name to the PostType property
+            $this->$key = $name;
+        }
+    }
+
+    /**
+     * Create options for Taxonomy
+     * @return array Options to pass to register_taxonomy
+     */
+    public function createOptions()
+    {
+        // default options
+        $options = [
+            'hierarchical' => true,
+            'show_admin_column' => true,
+            'rewrite' => [
+                'slug' => $this->slug,
+            ],
+        ];
+
+        // replace defaults with the options passed
+        $options = array_replace_recursive($options, $this->options);
+
+        // create and set labels
+        if (!isset($options['labels'])) {
+            $options['labels'] = $this->createLabels();
+        }
+
+        return $options;
+    }
+
+    /**
+     * Create labels for the Taxonomy
+     * @return array
+     */
+    public function createLabels()
+    {
+        // default labels
+        $labels = [
+            'name' => $this->plural,
+            'singular_name' => $this->singular,
+            'menu_name' => $this->plural,
+            'all_items' => "Alle {$this->plural}",
+            'edit_item' => "{$this->singular} bearbeiten",
+            'view_item' => "{$this->singular} anschauen",
+            'update_item' => "{$this->singular} aktualisieren",
+            'add_new_item' => "{$this->singular} hinzufügen",
+            'new_item_name' => "Neuer {$this->singular} Name",
+            'parent_item' => "Übergeordnete {$this->plural}",
+            'parent_item_colon' => "Übergeordnete {$this->plural}:",
+            'search_items' => "{$this->plural} suchen",
+            'popular_items' => "Häufig genutzte {$this->plural}",
+            'separate_items_with_commas' => "Trenne {$this->plural} mit Komma",
+            'add_or_remove_items' => "{$this->plural} hinzufügen oder entfernen",
+            'choose_from_most_used' => "Wählen aus den meistgenutzten {$this->plural}",
+            'not_found' => "Keine {$this->plural} gefunden",
+        ];
+
+        return array_replace($labels, $this->labels);
+    }
+
+    /**
+     * Modify the columns for the Taxonomy
+     * @param  array  $columns  The WordPress default columns
+     * @return array
+     */
+    public function modifyColumns($columns)
+    {
+        $columns = $this->columns->modifyColumns($columns);
+
+        return $columns;
+    }
+
+    /**
+     * Populate custom columns for the Taxonomy
+     * @param  string $content
+     * @param  string $column
+     * @param  int    $term_id
+     */
+    public function populateColumns($content, $column, $term_id)
+    {
+        if (isset($this->columns->populate[$column])) {
+            $content = call_user_func_array($this->columns()->populate[$column], [$content, $column, $term_id]);
+        }
+
+        return $content;
+    }
+
+    /**
+     * Make custom columns sortable
+     * @param array $columns Default WordPress sortable columns
+     */
+    public function setSortableColumns($columns)
+    {
+        if (!empty($this->columns()->sortable)) {
+            $columns = array_merge($columns, $this->columns()->sortable);
+        }
+
+        return $columns;
+    }
+
+    /**
+     * Set query to sort custom columns
+     * @param WP_Term_Query $query
+     */
+    public function sortSortableColumns($query)
+    {
+        // don't modify the query if we're not in the post type admin
+        if (!is_admin() || !in_array($this->name, $query->query_vars['taxonomy'] ?? [])) {
+            return;
+        }
+
+        // check the orderby is a custom ordering
+        if (isset($_GET['orderby']) && array_key_exists($_GET['orderby'], $this->columns()->sortable)) {
+            // get the custom sorting options
+            $meta = $this->columns()->sortable[$_GET['orderby']];
+
+            // check ordering is not numeric
+            if (is_string($meta)) {
+                $meta_key = $meta;
+                $orderby = 'meta_value';
+            } else {
+                $meta_key = $meta[0];
+                $orderby = 'meta_value_num';
+            }
+
+            // set the sort order
+            $query->query_vars['orderby'] = $orderby;
+            $query->query_vars['meta_key'] = $meta_key;
+        }
+    }
+}
-- 
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