Add block_version field to post get

Author: schlessera

features/post.feature

@@ -509,3 +509,39 @@ Feature: Manage WordPress posts
       """
       2005-01-24T09:52:00.000Z
       """
+
+  @require-wp-5.0
+  Scenario: Get block_version field for post with blocks
+    When I run `wp post create --post_title='Block Post' --post_content='<!-- wp:paragraph --><p>Hello block world</p><!-- /wp:paragraph -->' --porcelain`
+    Then STDOUT should be a number
+    And save STDOUT as {POST_ID}
+
+    When I run `wp post get {POST_ID} --field=block_version`
+    Then STDOUT should be:
+      """
+      1
+      """
+
+  @require-wp-5.0
+  Scenario: Get block_version field for post without blocks
+    When I run `wp post create --post_title='Classic Post' --post_content='<p>Just plain HTML</p>' --porcelain`
+    Then STDOUT should be a number
+    And save STDOUT as {POST_ID}
+
+    When I run `wp post get {POST_ID} --field=block_version`
+    Then STDOUT should be:
+      """
+      0
+      """
+
+  @require-wp-5.0
+  Scenario: Get block_version field included in default output
+    When I run `wp post create --post_title='Test Post' --post_content='<!-- wp:heading --><h2>Title</h2><!-- /wp:heading -->' --porcelain`
+    Then STDOUT should be a number
+    And save STDOUT as {POST_ID}
+
+    When I run `wp post get {POST_ID} --format=json`
+    Then STDOUT should be JSON containing:
+      """
+      {"block_version":1}
+      """

src/Post_Command.php

@@ -423,6 +423,11 @@ protected function _edit( $content, $title ) {
 	 *
 	 *     # Save the post content to a file
 	 *     $ wp post get 123 --field=content > file.txt
+	 *
+	 *     # Get the block version of a post (1 = has blocks, 0 = no blocks)
+	 *     # Requires WordPress 5.0+.
+	 *     $ wp post get 123 --field=block_version
+	 *     1
 	 */
 	public function get( $args, $assoc_args ) {
 		$post = $this->fetcher->get_check( $args[0] );
@@ -434,6 +439,10 @@ public function get( $args, $assoc_args ) {
 			$post_arr['url'] = get_permalink( $post->ID );
 		}
 
+		if ( function_exists( 'block_version' ) ) {
+			$post_arr['block_version'] = block_version( $post->post_content );
+		}
+
 		if ( empty( $assoc_args['fields'] ) ) {
 			$assoc_args['fields'] = array_keys( $post_arr );
 		}