issuer.php

<?php
/*
 * Plugin Name: Issuer
 * Plugin URI: http://google.com
 * Description: Helpers for creating Issues (a custom taxonomy) for posts to be filed under
 * Version: 1.0
 * Author: Lingliang Zhang
 * Author URI: http://lingliang.me
 * 
    Copyright 2013
    Lingliang Zhang
    (lingliangz@gmail.com)
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
    USA
  */

function add_issue_taxonomy() {
  $labels = array(
    'name'              => _x( 'Issues', 'taxonomy general name' ),
    'singular_name'     => _x( 'Issue', 'taxonomy singular name' ),
    'search_items'      => __( 'Search Issues' ),
    'all_items'         => __( 'All Issues' ),
    'edit_item'         => __( 'Edit Issue' ),
    'update_item'       => __( 'Update Issue' ),
    'add_new_item'      => __( 'Add New Issue' ),
    'new_item_name'     => __( 'New Issue Name' ),
    'menu_name'         => __( 'Issue' ),
  );
  $args = array(
    'hierarchical'      => false,
    'labels'            => $labels,
    'show_ui'           => true,
    'show_admin_column' => true,
    'query_var'         => true
  );

  register_taxonomy( 'issue', array( 'post', 'page' ), $args );
}
add_action("init", "add_issue_taxonomy");
add_filter('post_link', 'issue_permalink', 10, 3);
add_filter('post_type_link', 'issue_permalink', 10, 3);
 
function issue_permalink($permalink, $post_id, $leavename) {
    if (strpos($permalink, '%issue%') === FALSE) return $permalink;
     
         //Get post
        $post = get_post($post_id);
        if (!$post) return $permalink;
 
         //Get taxonomy terms
        $terms = wp_get_object_terms($post->ID, 'issue');   
        if (!is_wp_error($terms) && !empty($terms) && is_object($terms[0])) $taxonomy_slug = $terms[0]->slug;
        else $taxonomy_slug = 'other';
 
    return str_replace('%issue%', $taxonomy_slug, $permalink);
}  

function issuer_setup() {
  add_option( "current_issue", 0);
  add_option( "exclude_issues", array());
}
add_action("init", "issuer_setup");

function issuer_add_admin_scripts() {
		global $pagenow;
		// Only add JS and CSS on the edit-tags page
		if ( $pagenow == 'edit-tags.php' ) {
			wp_register_script(
				'issuer-js',
				plugins_url( '/js/issuer.js', __FILE__ ),
				array( 'jquery' )
			);
			wp_enqueue_script( 'issuer-js' );
    }
   //Register CSS
    wp_register_style(
      'issuer-bootstrap-css',
      plugins_url( '/css/bootstrap.min.css', __FILE__ )
    );
    wp_enqueue_style( 'issuer-bootstrap-css' );
}
add_action( 'admin_enqueue_scripts', 'issuer_add_admin_scripts' );


function issuer_edit_head($defaults) {  
    $defaults['current']  = 'Current';  
    $defaults['issuer-hide']  = 'Hide';  
    return $defaults;  
}  

function issuer_edit_column($c, $column_name, $term_id) {  
    if ($column_name == 'current') {  
      if (get_option("current_issue") == $term_id) { ?>
        <button class="btn btn-block btn-success issuer current-disabled" disabled="disabled" data-tax_id=<?php echo $term_id ?> data-root=<?php echo site_url(); ?>>Active</button>
      <?php } else { ?>
        <button class="btn btn-block btn-primary issuer current-active" data-tax_id=<?php echo $term_id ?> data-root=<?php echo site_url(); ?>>Make Active</button>
      <?php }
    } elseif ($column_name == 'issuer-hide') {
      if (in_array($term_id, get_option("exclude_issues"))) { ?>
        <button class="btn btn-block btn-danger issuer exclude-disabled" data-tax_id=<?php echo $term_id ?> data-root=<?php echo site_url(); ?>>Hidden</button>
      <?php } else { ?>
        <button class="btn btn-block btn-warning issuer exclude-active" data-tax_id=<?php echo $term_id ?> data-root=<?php echo site_url(); ?>>Hide</button>
      <?php }
    }
}  

add_filter('manage_edit-issue_columns', 'issuer_edit_head');  
add_filter('manage_issue_custom_column', 'issuer_edit_column', 10, 3);  

function issuer_make_endpoint() {
  // register a JSON endpoint for the root
  add_rewrite_endpoint("issuer", EP_ROOT);
}

add_action("init", "issuer_make_endpoint");
function issuer_add_queryvars( $query_vars ) {  
    $query_vars[] = 'issuer';  
    return $query_vars;  
}  
add_filter( 'query_vars', 'issuer_add_queryvars' );

function issuer_json_endpoint() {
  global $wp_query;
  if (!isset($wp_query->query_vars['issuer'])) {
    return;
  }

  $response = Array( "response" => "success");

  if (isset($_POST["issuer_active"])) {
    $issue = $_POST["issuer_active"];
    update_option("current_issue", $issue);
  } elseif  ($_POST["issuer_exclude"]) {
    $issue = $_POST["issuer_exclude"];
    $exclude = get_option("exclude_issues");
    if (!in_array($issue, $exclude)) {
      $exclude[] = $issue;
      update_option("exclude_issues", $exclude);
    } else {
      $response = Array( "response" => "failure");
    }
  } elseif  ($_POST["issuer_include"]) {
    $issue = $_POST["issuer_include"];
    $exclude = get_option("exclude_issues");
    if (($pos = array_search($issue, $exclude)) !== false) {
      $exclude = get_option("exclude_issues");
      unset($exclude[$pos]);
      update_option("exclude_issues", $exclude);
    } else {
      $response = Array( "response" => "failure");
    }
  } else {
    $response = Array( "response" => "failure");
  }

  header("Content-Type: application/json");

  echo json_encode($response);
  exit();
}
add_action( 'template_redirect', 'issuer_json_endpoint' );


function current_issue($query=array()) {
  if (get_option("current_issue") != 0) {
    return array_merge($query, array("tax_query" => array( array( 
      "taxonomy" => "issue",
      "terms" => get_option("current_issue"),
      "field" => "term_id")
    )));
  } else {
    if (empty($query)) {
      return "";
    } else {
      return $query;
    }
  }
}

function active_issue($query=array()) {
  $issue = get_query_var('issue'); 
  if (empty($issue) ) {
    $issue = get_option("current_issue");
    if (!empty($issue)) {
      $issue = get_term_by("id", $issue, "issue")->slug;
    }
  }
  if (!empty($issue)) {
    return array_merge($query, array("tax_query" => array( array( 
      "taxonomy" => "issue",
      "terms" => $issue,
      "field" => "slug")
    )));
  } else {
    if (empty($query)) {
      return "";
    } else {
      return $query;
    }
  }
}

function get_issue($query=array(), $issue_name=0, $issue_id=0) {
  if ($issue_name = 0) {
    // try get it from the query vars
    if (isset($wp_query->query_vars['issue'])) {
      $issue_name = $wp_qery->query_vars['issue'];
    } elseif (isset($_GET["issue"])) {
      // try get it from the post
      $issue_id = $_GET["issue"];
    } else {
      $issue_id = get_option("current_issue");
    }
  }
  if (empty($issue_name)) {
    $issue_query = array("issue" => $issue_name);
  } else {
    $issue_query = array("tax_query" => array( array( 
      "taxonomy" => "issue",
      "terms" => $issue_id,
      "field" => "term_id")
    ));
  }
  if (!empty($query)) {
    return array_merge($query, $issue_query);
  } else {
    return $issue_query;
  }
}

function list_issues($limit=0, $orderby="term_id", $order="DESC") { 
  $args = array(
    'orderby'       => $orderby, 
    'order'         => $order,
    'number'        => (empty($limit) ? '' : $limit), 
    'exclude'       => get_option("exclude_issues")
  );
  $terms = get_terms("issue", $args); ?>
  <ul class="issues-list">
  <?php foreach ($terms as $term) { ?>
    <li class="issue-item"><a href='<?php echo site_url() . '/' . $term->slug ?>'
      title='View all posts in <?php echo $term->name ?>'><?php echo $term->name ?></a></li>
  <?php } ?>
  </ul>
  <?php
}

function issuer_endpoints_activate() {
  global $wp_rewrite;
  issuer_make_endpoint();
  add_issue_taxonomy();
  $wp_rewrite -> flush_rules();
}
register_activation_hook( __FILE__, 'issuer_endpoints_activate' );

function issuer_deendpoints_activate() {
  // flush rules on deactivate as well so they're not left hanging around uselessly
  global $wp_rewrite;
  $wp_rewrite -> flush_rules();
}
register_deactivation_hook( __FILE__, 'issuer_deendpoints_activate' );
  
// custom fields for special gazelle issues
// inspired by http://sabramedia.com/blog/how-to-add-custom-fields-to-custom-taxonomies

function issuer_taxonomy_custom_fields($tag) {
  $t_id = $tag->term_id;
  $term_meta = get_option( "taxonomy_term_$t_id" );
?>
<tr class="form-field">  
    <th scope="row" valign="top">  
        <label for="logo">Logo URL</label>  
    </th>  
    <td>  
        <input type="text" name="term_meta[logo]" id="term_meta[logo]" size="25" style="width:60%;" value="<?php echo $term_meta['logo'] ? $term_meta['logo'] : ''; ?>"><br />  
        <span class="description">The url for the special gazelle logo in the header (293 x 363 pixels). Modify the original logo only.</span>  
    </td>  
</tr>  
<tr class="form-field">  
    <th scope="row" valign="top">  
        <label for="background">Background Texture URL</label>  
    </th>  
    <td>  
        <input type="text" name="term_meta[background]" id="term_meta[background]" size="25" style="width:60%;" value="<?php echo $term_meta['background'] ? $term_meta['background'] : ''; ?>"><br />  
        <span class="description">The url for a background texture for the navbar / issue screen.</span>  
    </td>  
</tr>  
<tr class="form-field">  
    <th scope="row" valign="top">  
      Banner Properties
    </th>  
    <td>
      <span class="description">
        The following fields are all optional and in order of priority precedence. Generally fields listed higher up take priority over the lower fields. You do not have to fill in every one.
        Not filling in any will remove the banner entirely.</span>
    </td>
</tr>  
<tr class="form-field">  
    <th scope="row" valign="top">  
        <label for="banner">Banner Link</label>  
    </th>  
    <td>  
        <input type="text" name="term_meta[banner_link]" id="term_meta[banner_link]" size="25" style="width:60%;" value="<?php echo $term_meta['banner_link'] ? $term_meta['banner_link'] : ''; ?>"><br />  
        <span class="description">Where clicking the banner leads the user.</span>  
    </td>  
</tr>
<tr class="form-field">  
    <th scope="row" valign="top">  
        <label for="banner">Youtube URL</label>  
    </th>  
    <td>  
        <input type="text" name="term_meta[youtube]" id="term_meta[youtube]" size="25" style="width:60%;" value="<?php echo $term_meta['youtube'] ? $term_meta['youtube'] : ''; ?>"><br />  
        <span class="description">The youtube to embed on all browsers.</span>  
    </td>  
</tr>
<tr>
    <th scope="row" valign="top">  
        <label for="banner">Video URL</label>  
    </th>  
    <td>  
        <input type="text" name="term_meta[video]" id="term_meta[video]" size="25" style="width:60%;" value="<?php echo $term_meta['video'] ? $term_meta['video'] : ''; ?>"><br />  
        <span class="description">The video to play on desktop browsers. Displays mobile_banner on the mobile versions.</span>  
    </td>  
</tr>  
<tr class="form-field">  
    <th scope="row" valign="top">  
        <label for="banner">OGG (fallback video) URL</label>  
    </th>  
    <td>  
        <input type="text" name="term_meta[video_ogg]" id="term_meta[video_ogg]" size="25" style="width:60%;" value="<?php echo $term_meta['video_ogg'] ? $term_meta['video_ogg'] : ''; ?>"><br />  
        <span class="description">The fallback video OGG Url for firefox support.</span>  
    </td>  
</tr>  
<tr class="form-field">  
    <th scope="row" valign="top">  
        <label for="banner">Banner URL</label>  
    </th>  
    <td>  
        <input type="text" name="term_meta[banner]" id="term_meta[banner]" size="25" style="width:60%;" value="<?php echo $term_meta['banner'] ? $term_meta['banner'] : ''; ?>"><br />  
        <span class="description">The url for a banner image for large browsers that aren't desktops (tablets).</span>  
    </td>  
</tr>  
<tr class="form-field">  
    <th scope="row" valign="top">  
        <label for="banner_mobile">Mobile Banner URL</label>  
    </th>  
    <td>  
        <input type="text" name="term_meta[banner_mobile]" id="term_meta[banner_mobile]" size="25" style="width:60%;" value="<?php echo $term_meta['banner_mobile'] ? $term_meta['banner_mobile'] : ''; ?>"><br />  
        <span class="description">The url for a banner image for mobile.</span>  
    </td>  
</tr>  
<tr class="form-field">  
    <th scope="row" valign="top">  
        <label for="editor_style">Editor's Pick Style</label>  
    </th>  
    <td>  
      <div class="radio">
        <label>
          <input type="radio" name="term_meta[editor_style]" id="term_meta[editor_style][default]" value="default" style="width:20%;" <?php echo $term_meta['editor_style'] == 'default' || $term_meta['editor_style'] == '' ? 'checked' : ''; ?>>
          Default (Default carousel + top articles)
        </label>
      </div>
      <div class="radio">
        <label>
          <input type="radio" name="term_meta[editor_style]" id="term_meta[editor_style][six_boxes]" value="six_boxes" style="width:20%;" <?php echo $term_meta['editor_style'] == 'six_boxes' ? 'checked' : ''; ?>>
          Six Boxes (No carousel or top articles followed by six boxes)
        </label>
      </div>
      <div class="radio">
        <label>
          <input type="radio" name="term_meta[editor_style]" id="term_meta[editor_style][small_banner]" value="small_banner" style="width:20%;" <?php echo $term_meta['editor_style'] == 'small_banner' ? 'checked' : ''; ?>>
          Small Banner (Carousel replaced with the banner followed by three boxes)
        </label>
      </div>
      <span class="description">The presentation style for the editor's picks.</span>  
    </td>  
</tr>  

<?php
}

// A callback function to save our extra taxonomy field(s)  
function save_issuer_custom_fields( $term_id ) {  
    if ( isset( $_POST['term_meta'] ) ) {  
        $t_id = $term_id;  
        $term_meta = get_option( "taxonomy_term_$t_id" );  
        $cat_keys = array_keys( $_POST['term_meta'] );  
            foreach ( $cat_keys as $key ){  
            if ( isset( $_POST['term_meta'][$key] ) ){  
                $term_meta[$key] = $_POST['term_meta'][$key];  
            }  
        }  
        //save the option array  
        update_option( "taxonomy_term_$t_id", $term_meta );  
    }  
} 

// Add the fields to the "issue" taxonomy, using our callback function  
add_action( 'issue_edit_form_fields', 'issuer_taxonomy_custom_fields', 10, 2 );  
  
// Save the changes made on the "issue" taxonomy, using our callback function  
add_action( 'edited_issue', 'save_issuer_custom_fields', 10, 2 );
add_action( 'created_issue', 'save_issuer_custom_fields', 10, 2 );