create subcommand extended to generate duplicate post

Author: sagarnasit

src/Post_Command.php

@@ -77,7 +77,10 @@ public function __construct() {
 	 *
 	 * [--post_name=<post_name>]
 	 * : The post name. Default is the sanitized post title when creating a new post.
-	 *
+       *
+       * [--from-post=<post_id>]
+       * : The post id of a post to be duplicated.
+       *
 	 * [--to_ping=<to_ping>]
 	 * : Space or carriage return-separated list of URLs to ping. Default empty.
 	 *
@@ -147,7 +150,11 @@ public function __construct() {
 	 *     # Create a post with multiple meta values.
 	 *     $ wp post create --post_title='A post' --post_content='Just a small post.' --meta_input='{"key1":"value1","key2":"value2"}
 	 *     Success: Created post 1923.
-	 */
+       *
+       *     # Create a duplicate post with same post data.
+       *     $ wp post create --from-post=123 --post_title='Different Title'
+       *     Success: Created post 2350.
+       */
 	public function create( $args, $assoc_args ) {
 		if ( ! empty( $args[0] ) ) {
 			$assoc_args['post_content'] = $this->read_from_file_or_stdin( $args[0] );
@@ -173,6 +180,21 @@ public function create( $args, $assoc_args ) {
 		$array_arguments = array( 'meta_input' );
 		$assoc_args      = \WP_CLI\Utils\parse_shell_arrays( $assoc_args, $array_arguments );
 
+            if( isset( $assoc_args['from-post'] ) ) {
+                  $post     = $this->fetcher->get_check( $assoc_args['from-post'] );
+                  $post_arr = get_object_vars( $post );
+                  $post_id  = $post_arr['ID'];
+                  unset( $post_arr['post_date'] );
+                  unset( $post_arr['post_date_gmt'] );
+                  unset( $post_arr['guid'] );
+
+                  if ( empty( $assoc_args['meta_input'] ) ) {
+                        $assoc_args['meta_input'] = $this->get_metadata( $post_id );
+                  }
+
+                  $assoc_args = array_merge( $post_arr, $assoc_args );
+            }
+
 		$assoc_args = wp_slash( $assoc_args );
 		parent::_create( $args, $assoc_args, function ( $params ) {
 			return wp_insert_post( $params, true );
@@ -797,4 +819,22 @@ private function get_category_ids( $arg ) {
 		// If no category ids found, return exploded array for compat with previous WP-CLI versions.
 		return $category_ids ? $category_ids : $categories;
 	}
+
+      /**
+       * Get post metadata.
+       *
+       * @param $post_id id of the post.
+       * @return array
+       */
+      private function get_metadata( $post_id = null ) {
+            $metadata = get_metadata( 'post', $post_id );
+            $items    = array();
+            foreach ( $metadata as $key => $values ) {
+                  foreach ( $values as $item_value ) {
+                        $item_value    = maybe_unserialize( $item_value );
+                        $items[ $key ] = $item_value;
+                  }
+            }
+            return $items;
+      }
 }