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1 <?php |
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2 /** |
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3 * Twenty Fourteen Featured Content |
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4 * |
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5 * This module allows you to define a subset of posts to be displayed |
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6 * in the theme's Featured Content area. |
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7 * |
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8 * For maximum compatibility with different methods of posting users |
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9 * will designate a featured post tag to associate posts with. Since |
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10 * this tag now has special meaning beyond that of a normal tags, users |
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11 * will have the ability to hide it from the front-end of their site. |
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12 */ |
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13 class Featured_Content { |
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14 |
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15 /** |
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16 * The maximum number of posts a Featured Content area can contain. |
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17 * |
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18 * We define a default value here but themes can override |
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19 * this by defining a "max_posts" entry in the second parameter |
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20 * passed in the call to add_theme_support( 'featured-content' ). |
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21 * |
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22 * @see Featured_Content::init() |
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23 * |
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24 * @since Twenty Fourteen 1.0 |
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25 * |
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26 * @static |
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27 * @access public |
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28 * @var int |
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29 */ |
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30 public static $max_posts = 15; |
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31 |
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32 /** |
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33 * Instantiate. |
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34 * |
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35 * All custom functionality will be hooked into the "init" action. |
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36 * |
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37 * @static |
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38 * @access public |
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39 * @since Twenty Fourteen 1.0 |
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40 */ |
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41 public static function setup() { |
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42 add_action( 'init', array( __CLASS__, 'init' ), 30 ); |
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43 } |
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44 |
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45 /** |
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46 * Conditionally hook into WordPress. |
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47 * |
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48 * Theme must declare that they support this module by adding |
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49 * add_theme_support( 'featured-content' ); during after_setup_theme. |
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50 * |
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51 * If no theme support is found there is no need to hook into WordPress. |
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52 * We'll just return early instead. |
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53 * |
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54 * @static |
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55 * @access public |
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56 * @since Twenty Fourteen 1.0 |
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57 */ |
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58 public static function init() { |
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59 $theme_support = get_theme_support( 'featured-content' ); |
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60 |
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61 // Return early if theme does not support Featured Content. |
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62 if ( ! $theme_support ) { |
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63 return; |
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64 } |
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65 |
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66 /* |
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67 * An array of named arguments must be passed as the second parameter |
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68 * of add_theme_support(). |
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69 */ |
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70 if ( ! isset( $theme_support[0] ) ) { |
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71 return; |
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72 } |
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73 |
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74 // Return early if "featured_content_filter" has not been defined. |
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75 if ( ! isset( $theme_support[0]['featured_content_filter'] ) ) { |
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76 return; |
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77 } |
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78 |
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79 $filter = $theme_support[0]['featured_content_filter']; |
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80 |
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81 // Theme can override the number of max posts. |
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82 if ( isset( $theme_support[0]['max_posts'] ) ) { |
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83 self::$max_posts = absint( $theme_support[0]['max_posts'] ); |
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84 } |
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85 |
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86 add_filter( $filter, array( __CLASS__, 'get_featured_posts' ) ); |
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87 add_action( 'customize_register', array( __CLASS__, 'customize_register' ), 9 ); |
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88 add_action( 'admin_init', array( __CLASS__, 'register_setting' ) ); |
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89 add_action( 'switch_theme', array( __CLASS__, 'delete_transient' ) ); |
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90 add_action( 'save_post', array( __CLASS__, 'delete_transient' ) ); |
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91 add_action( 'delete_post_tag', array( __CLASS__, 'delete_post_tag' ) ); |
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92 add_action( 'customize_controls_enqueue_scripts', array( __CLASS__, 'enqueue_scripts' ) ); |
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93 add_action( 'pre_get_posts', array( __CLASS__, 'pre_get_posts' ) ); |
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94 add_action( 'wp_loaded', array( __CLASS__, 'wp_loaded' ) ); |
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95 } |
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96 |
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97 /** |
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98 * Hide "featured" tag from the front-end. |
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99 * |
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100 * Has to run on wp_loaded so that the preview filters of the Customizer |
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101 * have a chance to alter the value. |
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102 * |
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103 * @static |
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104 * @access public |
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105 * @since Twenty Fourteen 1.0 |
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106 */ |
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107 public static function wp_loaded() { |
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108 if ( self::get_setting( 'hide-tag' ) ) { |
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109 add_filter( 'get_terms', array( __CLASS__, 'hide_featured_term' ), 10, 3 ); |
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110 add_filter( 'get_the_terms', array( __CLASS__, 'hide_the_featured_term' ), 10, 3 ); |
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111 } |
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112 } |
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113 |
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114 /** |
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115 * Get featured posts. |
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116 * |
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117 * @static |
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118 * @access public |
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119 * @since Twenty Fourteen 1.0 |
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120 * |
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121 * @return array Array of featured posts. |
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122 */ |
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123 public static function get_featured_posts() { |
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124 $post_ids = self::get_featured_post_ids(); |
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125 |
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126 // No need to query if there is are no featured posts. |
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127 if ( empty( $post_ids ) ) { |
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128 return array(); |
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129 } |
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130 |
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131 $featured_posts = get_posts( array( |
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132 'include' => $post_ids, |
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133 'posts_per_page' => count( $post_ids ), |
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134 ) ); |
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135 |
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136 return $featured_posts; |
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137 } |
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138 |
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139 /** |
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140 * Get featured post IDs |
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141 * |
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142 * This function will return the an array containing the |
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143 * post IDs of all featured posts. |
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144 * |
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145 * Sets the "featured_content_ids" transient. |
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146 * |
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147 * @static |
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148 * @access public |
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149 * @since Twenty Fourteen 1.0 |
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150 * |
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151 * @return array Array of post IDs. |
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152 */ |
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153 public static function get_featured_post_ids() { |
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154 // Get array of cached results if they exist. |
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155 $featured_ids = get_transient( 'featured_content_ids' ); |
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156 |
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157 if ( false === $featured_ids ) { |
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158 $settings = self::get_setting(); |
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159 $term = get_term_by( 'name', $settings['tag-name'], 'post_tag' ); |
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160 |
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161 if ( $term ) { |
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162 // Query for featured posts. |
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163 $featured_ids = get_posts( array( |
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164 'fields' => 'ids', |
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165 'numberposts' => self::$max_posts, |
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166 'suppress_filters' => false, |
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167 'tax_query' => array( |
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168 array( |
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169 'field' => 'term_id', |
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170 'taxonomy' => 'post_tag', |
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171 'terms' => $term->term_id, |
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172 ), |
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173 ), |
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174 ) ); |
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175 } |
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176 |
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177 // Get sticky posts if no Featured Content exists. |
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178 if ( ! $featured_ids ) { |
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179 $featured_ids = self::get_sticky_posts(); |
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180 } |
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181 |
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182 set_transient( 'featured_content_ids', $featured_ids ); |
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183 } |
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184 |
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185 // Ensure correct format before return. |
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186 return array_map( 'absint', $featured_ids ); |
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187 } |
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188 |
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189 /** |
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190 * Return an array with IDs of posts maked as sticky. |
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191 * |
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192 * @static |
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193 * @access public |
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194 * @since Twenty Fourteen 1.0 |
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195 * |
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196 * @return array Array of sticky posts. |
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197 */ |
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198 public static function get_sticky_posts() { |
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199 return array_slice( get_option( 'sticky_posts', array() ), 0, self::$max_posts ); |
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200 } |
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201 |
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202 /** |
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203 * Delete featured content ids transient. |
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204 * |
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205 * Hooks in the "save_post" action. |
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206 * |
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207 * @see Featured_Content::validate_settings(). |
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208 * |
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209 * @static |
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210 * @access public |
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211 * @since Twenty Fourteen 1.0 |
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212 */ |
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213 public static function delete_transient() { |
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214 delete_transient( 'featured_content_ids' ); |
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215 } |
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216 |
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217 /** |
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218 * Exclude featured posts from the home page blog query. |
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219 * |
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220 * Filter the home page posts, and remove any featured post ID's from it. |
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221 * Hooked onto the 'pre_get_posts' action, this changes the parameters of |
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222 * the query before it gets any posts. |
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223 * |
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224 * @static |
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225 * @access public |
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226 * @since Twenty Fourteen 1.0 |
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227 * |
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228 * @param WP_Query $query WP_Query object. |
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229 * @return WP_Query Possibly-modified WP_Query. |
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230 */ |
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231 public static function pre_get_posts( $query ) { |
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232 |
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233 // Bail if not home or not main query. |
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234 if ( ! $query->is_home() || ! $query->is_main_query() ) { |
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235 return; |
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236 } |
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237 |
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238 // Bail if the blog page is not the front page. |
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239 if ( 'posts' !== get_option( 'show_on_front' ) ) { |
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240 return; |
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241 } |
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242 |
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243 $featured = self::get_featured_post_ids(); |
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244 |
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245 // Bail if no featured posts. |
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246 if ( ! $featured ) { |
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247 return; |
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248 } |
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249 |
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250 // We need to respect post ids already in the blacklist. |
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251 $post__not_in = $query->get( 'post__not_in' ); |
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252 |
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253 if ( ! empty( $post__not_in ) ) { |
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254 $featured = array_merge( (array) $post__not_in, $featured ); |
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255 $featured = array_unique( $featured ); |
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256 } |
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257 |
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258 $query->set( 'post__not_in', $featured ); |
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259 } |
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260 |
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261 /** |
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262 * Reset tag option when the saved tag is deleted. |
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263 * |
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264 * It's important to mention that the transient needs to be deleted, |
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265 * too. While it may not be obvious by looking at the function alone, |
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266 * the transient is deleted by Featured_Content::validate_settings(). |
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267 * |
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268 * Hooks in the "delete_post_tag" action. |
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269 * |
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270 * @see Featured_Content::validate_settings(). |
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271 * |
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272 * @static |
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273 * @access public |
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274 * @since Twenty Fourteen 1.0 |
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275 * |
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276 * @param int $tag_id The term_id of the tag that has been deleted. |
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277 */ |
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278 public static function delete_post_tag( $tag_id ) { |
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279 $settings = self::get_setting(); |
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280 |
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281 if ( empty( $settings['tag-id'] ) || $tag_id != $settings['tag-id'] ) { |
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282 return; |
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283 } |
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284 |
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285 $settings['tag-id'] = 0; |
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286 $settings = self::validate_settings( $settings ); |
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287 update_option( 'featured-content', $settings ); |
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288 } |
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289 |
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290 /** |
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291 * Hide featured tag from displaying when global terms are queried from the front-end. |
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292 * |
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293 * Hooks into the "get_terms" filter. |
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294 * |
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295 * @static |
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296 * @access public |
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297 * @since Twenty Fourteen 1.0 |
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298 * |
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299 * @param array $terms List of term objects. This is the return value of get_terms(). |
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300 * @param array $taxonomies An array of taxonomy slugs. |
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301 * @return array A filtered array of terms. |
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302 * |
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303 * @uses Featured_Content::get_setting() |
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304 */ |
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305 public static function hide_featured_term( $terms, $taxonomies, $args ) { |
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306 |
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307 // This filter is only appropriate on the front-end. |
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308 if ( is_admin() ) { |
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309 return $terms; |
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310 } |
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311 |
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312 // We only want to hide the featured tag. |
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313 if ( ! in_array( 'post_tag', $taxonomies ) ) { |
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314 return $terms; |
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315 } |
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316 |
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317 // Bail if no terms were returned. |
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318 if ( empty( $terms ) ) { |
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319 return $terms; |
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320 } |
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321 |
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322 // Bail if term objects are unavailable. |
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323 if ( 'all' != $args['fields'] ) { |
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324 return $terms; |
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325 } |
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326 |
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327 $settings = self::get_setting(); |
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328 foreach ( $terms as $order => $term ) { |
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329 if ( ( $settings['tag-id'] === $term->term_id || $settings['tag-name'] === $term->name ) && 'post_tag' === $term->taxonomy ) { |
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330 unset( $terms[ $order ] ); |
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331 } |
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332 } |
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333 |
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334 return $terms; |
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335 } |
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336 |
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337 /** |
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338 * Hide featured tag from display when terms associated with a post object |
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339 * are queried from the front-end. |
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340 * |
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341 * Hooks into the "get_the_terms" filter. |
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342 * |
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343 * @static |
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344 * @access public |
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345 * @since Twenty Fourteen 1.0 |
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346 * |
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347 * @param array $terms A list of term objects. This is the return value of get_the_terms(). |
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348 * @param int $id The ID field for the post object that terms are associated with. |
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349 * @param array $taxonomy An array of taxonomy slugs. |
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350 * @return array Filtered array of terms. |
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351 * |
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352 * @uses Featured_Content::get_setting() |
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353 */ |
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354 public static function hide_the_featured_term( $terms, $id, $taxonomy ) { |
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355 |
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356 // This filter is only appropriate on the front-end. |
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357 if ( is_admin() ) { |
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358 return $terms; |
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359 } |
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360 |
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361 // Make sure we are in the correct taxonomy. |
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362 if ( 'post_tag' != $taxonomy ) { |
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363 return $terms; |
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364 } |
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365 |
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366 // No terms? Return early! |
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367 if ( empty( $terms ) ) { |
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368 return $terms; |
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369 } |
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370 |
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371 $settings = self::get_setting(); |
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372 foreach ( $terms as $order => $term ) { |
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373 if ( ( $settings['tag-id'] === $term->term_id || $settings['tag-name'] === $term->name ) && 'post_tag' === $term->taxonomy ) { |
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374 unset( $terms[ $term->term_id ] ); |
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375 } |
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376 } |
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377 |
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378 return $terms; |
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379 } |
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380 |
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381 /** |
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382 * Register custom setting on the Settings -> Reading screen. |
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383 * |
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384 * @static |
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385 * @access public |
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386 * @since Twenty Fourteen 1.0 |
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387 */ |
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388 public static function register_setting() { |
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389 register_setting( 'featured-content', 'featured-content', array( __CLASS__, 'validate_settings' ) ); |
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390 } |
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391 |
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392 /** |
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393 * Add settings to the Customizer. |
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394 * |
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395 * @static |
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396 * @access public |
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397 * @since Twenty Fourteen 1.0 |
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398 * |
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399 * @param WP_Customize_Manager $wp_customize Customizer object. |
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400 */ |
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401 public static function customize_register( $wp_customize ) { |
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402 $wp_customize->add_section( 'featured_content', array( |
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403 'title' => __( 'Featured Content', 'twentyfourteen' ), |
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404 'description' => sprintf( __( 'Use a <a href="%1$s">tag</a> to feature your posts. If no posts match the tag, <a href="%2$s">sticky posts</a> will be displayed instead.', 'twentyfourteen' ), |
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405 esc_url( add_query_arg( 'tag', _x( 'featured', 'featured content default tag slug', 'twentyfourteen' ), admin_url( 'edit.php' ) ) ), |
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406 admin_url( 'edit.php?show_sticky=1' ) |
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407 ), |
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408 'priority' => 130, |
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409 'theme_supports' => 'featured-content', |
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410 ) ); |
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411 |
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412 // Add Featured Content settings. |
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413 $wp_customize->add_setting( 'featured-content[tag-name]', array( |
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414 'default' => _x( 'featured', 'featured content default tag slug', 'twentyfourteen' ), |
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415 'type' => 'option', |
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416 'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ), |
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417 ) ); |
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418 $wp_customize->add_setting( 'featured-content[hide-tag]', array( |
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419 'default' => true, |
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420 'type' => 'option', |
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421 'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ), |
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422 ) ); |
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423 |
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424 // Add Featured Content controls. |
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425 $wp_customize->add_control( 'featured-content[tag-name]', array( |
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426 'label' => __( 'Tag Name', 'twentyfourteen' ), |
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427 'section' => 'featured_content', |
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428 'priority' => 20, |
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429 ) ); |
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430 $wp_customize->add_control( 'featured-content[hide-tag]', array( |
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431 'label' => __( 'Don’t display tag on front end.', 'twentyfourteen' ), |
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432 'section' => 'featured_content', |
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433 'type' => 'checkbox', |
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434 'priority' => 30, |
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435 ) ); |
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436 } |
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437 |
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438 /** |
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439 * Enqueue the tag suggestion script. |
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440 * |
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441 * @static |
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442 * @access public |
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443 * @since Twenty Fourteen 1.0 |
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444 */ |
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445 public static function enqueue_scripts() { |
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446 wp_enqueue_script( 'featured-content-suggest', get_template_directory_uri() . '/js/featured-content-admin.js', array( 'jquery', 'suggest' ), '20131022', true ); |
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447 } |
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448 |
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449 /** |
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450 * Get featured content settings. |
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451 * |
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452 * Get all settings recognized by this module. This function |
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453 * will return all settings whether or not they have been stored |
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454 * in the database yet. This ensures that all keys are available |
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455 * at all times. |
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456 * |
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457 * In the event that you only require one setting, you may pass |
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458 * its name as the first parameter to the function and only that |
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459 * value will be returned. |
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460 * |
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461 * @static |
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462 * @access public |
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463 * @since Twenty Fourteen 1.0 |
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464 * |
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465 * @param string $key The key of a recognized setting. |
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466 * @return mixed Array of all settings by default. A single value if passed as first parameter. |
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467 */ |
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468 public static function get_setting( $key = 'all' ) { |
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469 $saved = (array) get_option( 'featured-content' ); |
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470 |
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471 $defaults = array( |
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472 'hide-tag' => 1, |
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473 'tag-id' => 0, |
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474 'tag-name' => _x( 'featured', 'featured content default tag slug', 'twentyfourteen' ), |
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475 ); |
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476 |
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477 $options = wp_parse_args( $saved, $defaults ); |
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478 $options = array_intersect_key( $options, $defaults ); |
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479 |
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480 if ( 'all' != $key ) { |
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481 return isset( $options[ $key ] ) ? $options[ $key ] : false; |
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482 } |
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483 |
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484 return $options; |
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485 } |
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486 |
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487 /** |
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488 * Validate featured content settings. |
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489 * |
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490 * Make sure that all user supplied content is in an expected |
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491 * format before saving to the database. This function will also |
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492 * delete the transient set in Featured_Content::get_featured_content(). |
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493 * |
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494 * @static |
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495 * @access public |
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496 * @since Twenty Fourteen 1.0 |
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497 * |
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498 * @param array $input Array of settings input. |
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499 * @return array Validated settings output. |
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500 */ |
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501 public static function validate_settings( $input ) { |
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502 $output = array(); |
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503 |
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504 if ( empty( $input['tag-name'] ) ) { |
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505 $output['tag-id'] = 0; |
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506 } else { |
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507 $term = get_term_by( 'name', $input['tag-name'], 'post_tag' ); |
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508 |
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509 if ( $term ) { |
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510 $output['tag-id'] = $term->term_id; |
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511 } else { |
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512 $new_tag = wp_create_tag( $input['tag-name'] ); |
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513 |
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514 if ( ! is_wp_error( $new_tag ) && isset( $new_tag['term_id'] ) ) { |
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515 $output['tag-id'] = $new_tag['term_id']; |
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516 } |
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517 } |
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518 |
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519 $output['tag-name'] = $input['tag-name']; |
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520 } |
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521 |
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522 $output['hide-tag'] = isset( $input['hide-tag'] ) && $input['hide-tag'] ? 1 : 0; |
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523 |
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524 // Delete the featured post ids transient. |
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525 self::delete_transient(); |
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526 |
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527 return $output; |
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528 } |
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529 } // Featured_Content |
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530 |
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531 Featured_Content::setup(); |