Add --force-check flag to wp plugin list and wp theme list.

features/plugin-list.feature

@@ -0,0 +1,64 @@
+Feature: List WordPress plugins
+
+  Scenario: Refresh update_plugins transient when listing plugins with --force-check flag
+    Given a WP install
+    And I run `wp plugin uninstall --all`
+    And I run `wp plugin install hello-dolly`
+    And a update-transient.php file:
+      """
+      <?php
+      $transient = get_site_transient( 'update_plugins' );
+      $transient->response['hello-dolly/hello.php'] = (object) array(
+        'id'          => 'w.org/plugins/hello-dolly',
+        'slug'        => 'hello-dolly',
+        'plugin'      => 'hello-dolly/hello.php',
+        'new_version' => '100.0.0',
+        'url'         => 'https://wordpress.org/plugins/hello-dolly/',
+        'package'     => 'https://downloads.wordpress.org/plugin/hello-dolly.100.0.0.zip',
+      );
+      $transient->checked = array(
+        'hello-dolly/hello.php' => '1.7.2',
+      );
+      unset( $transient->no_update['hello-dolly/hello.php'] );
+      set_site_transient( 'update_plugins', $transient );
+      WP_CLI::success( 'Transient updated.' );
+      """
+
+    # Populates the initial transient in the database
+    When I run `wp plugin list --fields=name,status,update`
+    Then STDOUT should be a table containing rows:
+      | name         | status   | update |
+      | hello-dolly  | inactive | none   |
+
+    # Modify the transient in the database to simulate an update
+    When I run `wp eval-file update-transient.php`
+    Then STDOUT should be:
+      """
+      Success: Transient updated.
+      """
+
+    # Verify the fake transient value produces the expected output
+    When I run `wp plugin list --fields=name,status,update`
+    Then STDOUT should be a table containing rows:
+      | name         | status   | update    |
+      | hello-dolly  | inactive | available |
+
+    # Repeating the same command again should produce the same results
+    When I run the previous command again
+    Then STDOUT should be a table containing rows:
+      | name         | status   | update    |
+      | hello-dolly  | inactive | available |
+
+    # Using the --force-check flag should refresh the transient back to the original value
+    When I run `wp plugin list --fields=name,status,update --force-check`
+    Then STDOUT should be a table containing rows:
+      | name         | status   | update |
+      | hello-dolly  | inactive | none   |
+
+    When I try `wp plugin list --skip-update-check --force-check`
+    Then STDERR should contain:
+      """
+      Error: Plugin updates cannot be both force-checked and skipped. Choose one.
+      """
+    And STDOUT should be empty
+    And the return code should be 1

features/theme-list.feature

@@ -0,0 +1,62 @@
+Feature: List WordPress themes
+
+  Scenario: Refresh update_themes transient when listing themes with --force-check flag
+    Given a WP install
+    And I run `wp theme delete --all --force`
+    And I run `wp theme install --force twentytwelve --version=4.2`
+    And a update-transient.php file:
+      """
+      <?php
+      $transient = get_site_transient( 'update_themes' );
+      $transient->response['twentytwelve'] = (object) array(
+        'theme'        => 'twentytwelve',
+        'new_version'  => '100.0.0',
+        'url'          => 'https://wordpress.org/themes/twentytwelve/',
+        'package'      => 'https://downloads.wordpress.org/theme/twentytwelve.100.zip'
+      );
+      $transient->checked = array(
+        'twentytwelve' => '4.2',
+      );
+      unset( $transient->no_update['twentytwelve'] );
+      set_site_transient( 'update_themes', $transient );
+      WP_CLI::success( 'Transient updated.' );
+      """
+
+    # Populates the initial transient in the database
+    When I run `wp theme list --fields=name,update`
+    Then STDOUT should be a table containing rows:
+      | name              | update |
+      | twentytwelve      | none   |
+
+    # Modify the transient in the database to simulate an update
+    When I run `wp eval-file update-transient.php`
+    Then STDOUT should be:
+      """
+      Success: Transient updated.
+      """
+
+    # Verify the fake transient value produces the expected output
+    When I run `wp theme list --fields=name,update`
+    Then STDOUT should be a table containing rows:
+      | name              | update    |
+      | twentytwelve      | available |
+
+    # Repeating the same command again should produce the same results
+    When I run the previous command again
+    Then STDOUT should be a table containing rows:
+      | name              | update    |
+      | twentytwelve      | available |
+
+    # Using the --force-check flag should refresh the transient back to the original value
+    When I run `wp theme list --fields=name,update --force-check`
+    Then STDOUT should be a table containing rows:
+      | name              | update |
+      | twentytwelve      | none   |
+
+    When I try `wp theme list --skip-update-check --force-check`
+    Then STDERR should contain:
+      """
+      Error: Theme updates cannot be both force-checked and skipped. Choose one.
+      """
+    And STDOUT should be empty
+    And the return code should be 1

src/Plugin_Command.php

@@ -1374,6 +1374,9 @@ public function delete( $args, $assoc_args = array() ) {
 	 * [--skip-update-check]
 	 * : If set, the plugin update check will be skipped.
 	 *
+	 * [--force-check]
+	 * : Bypass the transient cache and force a fresh update check.
+	 *
 	 * [--recently-active]
 	 * : If set, only recently active plugins will be shown and the status filter will be ignored.
 	 *

src/Theme_Command.php

@@ -880,6 +880,9 @@ public function delete( $args, $assoc_args ) {
 	 * [--skip-update-check]
 	 * : If set, the theme update check will be skipped.
 	 *
+	 * [--force-check]
+	 * : Bypass the transient cache and force a fresh update check.
+	 *
 	 * ## AVAILABLE FIELDS
 	 *
 	 * These fields will be displayed by default for each theme:

src/WP_CLI/CommandWithUpgrade.php

@@ -532,6 +532,16 @@ static function ( $result ) {
 	// phpcs:ignore PSR2.Methods.MethodDeclaration.Underscore -- Whitelisting to provide backward compatibility to classes possibly extending this class.
 	protected function _list( $_, $assoc_args ) {
 
+		// If `--force-check` and `--skip-update-check` flags are both present, abort.
+		if ( true === (bool) Utils\get_flag_value( $assoc_args, 'force-check', false ) && true === (bool) Utils\get_flag_value( $assoc_args, 'skip-update-check', false ) ) {
+			WP_CLI::error( ucfirst( "{$this->item_type} updates cannot be both force-checked and skipped. Choose one." ) );
+		}
+
+		// If `--force-check` flag is present, delete the upgrade transient.
+		if ( true === (bool) Utils\get_flag_value( $assoc_args, 'force-check', false ) ) {
+			delete_site_transient( $this->upgrade_transient );
+		}
+
 		// Force WordPress to check for updates if `--skip-update-check` is not passed.
 		if ( false === (bool) Utils\get_flag_value( $assoc_args, 'skip-update-check', false ) ) {
 			call_user_func( $this->upgrade_refresh );