plugin-framework.php

<?php
/*
Plugin Name: Bulk Post Metadata
Description: This plugin allows you to assign metadata to posts in bulk
Version: 1.0
Author: Joey Blake
Author URI: http://www.codenimbus.com
Plugin URI: http://github.com/joeyblake/bulk-post-metadata
*/

class BulkPostMetadata {

  private static $plugin;
  static function load() {
    $class = __CLASS__; 
    return ( self::$plugin ? self::$plugin : ( self::$plugin = new $class() ) );
  }

  private function __construct() {
    add_action( 'init', array( $this, 'init' ), 10 );
    add_action( 'admin_init', array( $this, 'admin_init' ), 10 );

  }

  function init() {
    if ( is_admin() ) {
      add_action( 'admin_menu', array( $this, 'admin_menu' ) );
    }

    add_shortcode( 'today', array($this, 'today_shortcode') );
  }

  function admin_init() {}

  function admin_menu() {  
    add_posts_page( 'Bulk Post Metadata', 'Bulk Post Metadata', 'administrator', __CLASS__, array( $this, 'bulk_posts_metadata' ) );
    add_options_page( 'Bulk Post Metadata', 'Bulk Post Metadata', 'administrator', __CLASS__, array( $this, 'settings' ) );  
    register_setting( __CLASS__, sprintf('%s_settings', __CLASS__), array( $this, 'sanitize_settings' ) );
  }

  function bulk_posts_metadata(){
    if ($_POST) { 
      print_r($_POST['_meta_name']);
      $posts_array = get_posts( array('numberposts' => -1) );
      $meta = array();
      foreach( $_POST['_meta_name'] as $key => $_meta_name ) {
        $val_array = array();
        $metaval_array = explode( "\n", $_POST['_meta_value'][$key] );
        foreach ( $metaval_array as $meta_val ){
          $sub = explode(':', $meta_val);
          $val_array[$sub[0]] = $sub[1];
        }
        $meta[$_meta_name] = $val_array;
        foreach ( $posts_array as $post ) {
          if ( ! get_post_meta( $post->ID, $_meta_name ) ){
            $a = add_post_meta( $post->ID, $_meta_name, $val_array );
            echo $a.'<br />';
          }
        }
      }
    }
    ?>
    <div class="wrap">
      <h2>Bulk Assign Metadata</h2>
      <form action="" method="post" accept-charset="utf-8">
        <table id="metadatas" class="wp-list-table widefat fixed">
          <thead>
            <tr>
              <th style="width:200px;">Metadata Key</th>
              <th style="width:425px;">Metadata Value</th>
              <th></th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td><input type="text" name="_meta_name[]" id="" /></td>
              <td><textarea name="_meta_value[]" style="width:400px;"></textarea></td>
              <td style="padding-top:12px;"><a href="#" onclick="addEntry(); return false;" title="" class="button">+ Add Another</a></td>
            </tr>
          </tbody>
        </table>
        <input type="submit" class="button-primary" value="<?php esc_attr_e('Save Changes'); ?>" />
      </form>
    </div>
    <script>
      function addEntry(){
        var newData = jQuery('<tr><td><input type="text" name="_meta_name[]" id="" /></td><td><textarea name="_meta_value[]" style="width:400px;"></textarea></td><td><a href="#" onclick="addEntry(); return false;" title="" class="button">+ Add Another</a></td></tr>');
        jQuery('#metadatas').append(newData);
      }
    </script>
    <?php
  }

  function settings() {
    ?>  
      <div class="wrap">
        <?php screen_icon() ?>
        <h2>Bulk Post Metadata Settings</h2>
        <form action="<?php echo admin_url('options.php') ?>" method="post">
          <?php settings_fields( __CLASS__ ) ?>
          
          <?php ### your fields go here ### ?>

          <input type="submit" class="button-primary" value="<?php esc_attr_e('Save Changes'); ?>" />
        </form>
      </div>
    <?php
  }

  function sanitize_settings($settings) {
    
    // add_settings_error( 'text_field', $this->id('text_field', false), 'foo' );

    return $settings;
  }


  function today_shortcode($atts, $content = '') {
      
    extract( $atts = shortcode_atts( array(
      'format' => 'M d, Y'
    ), $atts ) );

    return date( $format, current_time('timestamp') );

  }

  // ===========================================================================
  // Helper functions - Provided to your plugin, courtesy of wp-kitchensink
  // http://github.com/collegeman/wp-kitchensink
  // ===========================================================================
  
  /**
   * This function provides a convenient way to access your plugin's settings.
   * The settings are serialized and stored in a single WP option. This function
   * opens that serialized array, looks for $name, and if it's found, returns
   * the value stored there. Otherwise, $default is returned.
   * @param string $name
   * @param mixed $default
   * @return mixed
   */
  function setting($name, $default = null) {
    $settings = get_option(sprintf('%s_settings', __CLASS__), array());
    return isset($settings[$name]) ? $settings[$name] : $default;
  }

  /**
   * Use this function in conjunction with Settings pattern #3 to generate the
   * HTML ID attribute values for anything on the page. This will help
   * to ensure that your field IDs are unique and scoped to your plugin.
   *
   * @see settings.php
   */
  function id($name, $echo = true) {
    $id = sprintf('%s_settings_%s', __CLASS__, $name);
    if ($echo) {
      echo $id;
    }
    return $id;
  }

  /**
   * Use this function in conjunction with Settings pattern #3 to generate the
   * HTML NAME attribute values for form input fields. This will help
   * to ensure that your field names are unique and scoped to your plugin, and
   * named in compliance with the setting storage pattern defined above.
   * 
   * @see settings.php
   */
  function field($name, $echo = true) {
    $field = sprintf('%s_settings[%s]', __CLASS__, $name);
    if ($echo) {
      echo $field;
    }
    return $field;
  }
  
  /**
   * A helper function. Prints 'checked="checked"' under two conditions:
   * 1. $field is a string, and $this->setting( $field ) == $value
   * 2. $field evaluates to true
   */
  function checked($field, $value = null) {
    if ( is_string($field) ) {
      if ( $this->setting($field) == $value ) {
        echo 'checked="checked"';
      }
    } else if ( (bool) $field ) {
      echo 'checked="checked"';
    }
  }

  /**
   * A helper function. Prints 'selected="selected"' under two conditions:
   * 1. $field is a string, and $this->setting( $field ) == $value
   * 2. $field evaluates to true
   */
  function selected($field, $value = null) {
    if ( is_string($field) ) {
      if ( $this->setting($field) == $value ) {
        echo 'selected="selected"';
      }
    } else if ( (bool) $field ) {
      echo 'selected="selected"';
    }
  }
  
}

#
# Initialize our plugin
#
BulkPostMetadata::load();

#
# Load global functions (e.g., template functions)
#
require_once(dirname(__FILE__).'/globals.php');