wp post create: Add JSON input support for tax_input

features/post.feature

@@ -422,6 +422,36 @@ Feature: Manage WordPress posts
       post-2
       """
 
+  Scenario: Creating/updating posts with taxonomies
+    When I run `wp term create category "First Category" --porcelain`
+    And save STDOUT as {CAT_1}
+    And I run `wp term create category "Second Category" --porcelain`
+    And save STDOUT as {CAT_2}
+    And I run `wp term create post_tag "Term One" --porcelain`
+    And I run `wp term create post_tag "Term Two" --porcelain`
+    And I run `wp post create --post_title='Test Post' --post_content='Test post content' --tax_input='{"category":[{CAT_1},{CAT_2}],"post_tag":["term-one", "term-two"]}' --porcelain`
+    Then STDOUT should be a number
+    And save STDOUT as {POST_ID}
+
+    When I run `wp post term list {POST_ID} category post_tag --format=table --fields=name,taxonomy`
+    Then STDOUT should be a table containing rows:
+      | name            | taxonomy |
+      | First Category  | category |
+      | Second Category | category |
+      | Term One        | post_tag |
+      | Term Two        | post_tag |
+    When I run `wp post update {POST_ID} --tax_input='{"category":[{CAT_1}],"post_tag":["term-one"]}'`
+    Then STDOUT should contain:
+      """
+      Success: Updated post {POST_ID}.
+      """
+
+    When I run `wp post term list {POST_ID} category post_tag --format=table --fields=name,taxonomy`
+    Then STDOUT should be a table containing rows:
+      | name           | taxonomy |
+      | First Category | category |
+      | Term One       | post_tag |
+
   Scenario: Update categories on a post
     When I run `wp term create category "Test Category" --porcelain`
     Then save STDOUT as {TERM_ID}

src/Post_Command.php

@@ -122,6 +122,8 @@ public function __construct() {
 	 * [--tax_input=<tax_input>]
 	 * : Array of taxonomy terms keyed by their taxonomy name. Default empty.
 	 *
+	 *   Note: In WordPress core, this normally requires a user context to satisfy capability checks. WP-CLI bypasses this for convenience. See https://core.trac.wordpress.org/ticket/19373
+	 *
 	 * [--meta_input=<meta_input>]
 	 * : Array in JSON format of post meta values keyed by their post meta key. Default empty.
 	 *
@@ -183,7 +185,7 @@ public function create( $args, $assoc_args ) {
 			$assoc_args['post_category'] = $this->get_category_ids( $assoc_args['post_category'] );
 		}
 
-		$array_arguments = [ 'meta_input' ];
+		$array_arguments = [ 'meta_input', 'tax_input' ];
 		$assoc_args      = Utils\parse_shell_arrays( $assoc_args, $array_arguments );
 
 		if ( isset( $assoc_args['from-post'] ) ) {
@@ -212,7 +214,41 @@ public function create( $args, $assoc_args ) {
 			$args,
 			$assoc_args,
 			function ( $params ) {
-				return wp_insert_post( $params, true );
+				$filter_callback = null;
+
+				if ( 0 === get_current_user_id() && ! empty( $params['tax_input'] ) ) {
+					$allowed_caps = [];
+					/**
+					 * @var string $taxonomy
+					 */
+					foreach ( array_keys( $params['tax_input'] ) as $taxonomy ) {
+						$tax_obj = get_taxonomy( $taxonomy );
+						if ( $tax_obj ) {
+							$primitive_caps = map_meta_cap( $tax_obj->cap->assign_terms, 0 );
+							$allowed_caps   = array_merge( $allowed_caps, $primitive_caps );
+						}
+					}
+
+					if ( ! empty( $allowed_caps ) ) {
+						$filter_callback = function ( $allcaps, $caps ) use ( $allowed_caps ) {
+							foreach ( $caps as $cap ) {
+								if ( in_array( $cap, $allowed_caps, true ) ) {
+									$allcaps[ $cap ] = true;
+								}
+							}
+							return $allcaps;
+						};
+						add_filter( 'user_has_cap', $filter_callback, 10, 2 );
+					}
+				}
+
+				$result = wp_insert_post( $params, true );
+
+				if ( $filter_callback ) {
+					remove_filter( 'user_has_cap', $filter_callback );
+				}
+
+				return $result;
 			}
 		);
 	}
@@ -297,6 +333,8 @@ function ( $params ) {
 	 * [--tax_input=<tax_input>]
 	 * : Array of taxonomy terms keyed by their taxonomy name. Default empty.
 	 *
+	 *   Note: In WordPress core, this normally requires a user context to satisfy capability checks. WP-CLI bypasses this for convenience. See https://core.trac.wordpress.org/ticket/19373
+	 *
 	 * [--meta_input=<meta_input>]
 	 * : Array in JSON format of post meta values keyed by their post meta key. Default empty.
 	 *
@@ -348,15 +386,49 @@ public function update( $args, $assoc_args ) {
 			$assoc_args['post_category'] = $this->get_category_ids( $assoc_args['post_category'] );
 		}
 
-		$array_arguments = [ 'meta_input' ];
+		$array_arguments = [ 'meta_input', 'tax_input' ];
 		$assoc_args      = Utils\parse_shell_arrays( $assoc_args, $array_arguments );
 
 		$assoc_args = wp_slash( $assoc_args );
 		parent::_update(
 			$args,
 			$assoc_args,
 			function ( $params ) {
-				return wp_update_post( $params, true );
+				$filter_callback = null;
+
+				if ( 0 === get_current_user_id() && ! empty( $params['tax_input'] ) ) {
+					$allowed_caps = [];
+					/**
+					 * @var string $taxonomy
+					 */
+					foreach ( array_keys( $params['tax_input'] ) as $taxonomy ) {
+						$tax_obj = get_taxonomy( $taxonomy );
+						if ( $tax_obj ) {
+							$primitive_caps = map_meta_cap( $tax_obj->cap->assign_terms, 0 );
+							$allowed_caps   = array_merge( $allowed_caps, $primitive_caps );
+						}
+					}
+
+					if ( ! empty( $allowed_caps ) ) {
+						$filter_callback = function ( $allcaps, $caps ) use ( $allowed_caps ) {
+							foreach ( $caps as $cap ) {
+								if ( in_array( $cap, $allowed_caps, true ) ) {
+									$allcaps[ $cap ] = true;
+								}
+							}
+							return $allcaps;
+						};
+						add_filter( 'user_has_cap', $filter_callback, 10, 2 );
+					}
+				}
+
+				$result = wp_update_post( $params, true );
+
+				if ( $filter_callback ) {
+					remove_filter( 'user_has_cap', $filter_callback );
+				}
+
+				return $result;
 			}
 		);
 	}