Allow deleting the currently active theme

features/theme-delete.feature

@@ -13,6 +13,46 @@ Feature: Delete WordPress themes
       """
     And the return code should be 0
 
+  Scenario: Delete an active theme
+    When I run `wp theme activate p2`
+    Then STDOUT should not be empty
+
+    When I try `wp theme delete p2`
+    Then STDERR should be:
+    """
+    Warning: Can't delete the currently active theme: p2
+    Error: No themes deleted.
+    """
+
+    When I try `wp theme delete p2 --force`
+    Then STDOUT should contain:
+    """
+    Deleted 'p2' theme.
+    """
+
+  Scenario: Delete all installed themes
+    When I run `wp theme list --status=active --field=name --porcelain`
+    And save STDOUT as {ACTIVE_THEME}
+
+    When I try `wp theme delete --all`
+    Then STDERR should contain:
+    """
+    Warning: Can't delete the currently active theme: {ACTIVE_THEME}
+    """
+
+    When I run `wp theme delete --all --force`
+    Then STDOUT should be:
+      """
+      Deleted '{ACTIVE_THEME}' theme.
+      Success: Deleted 1 of 1 themes.
+      """
+
+    When I try the previous command again
+    Then STDOUT should be:
+    """
+    Success: No themes installed.
+    """
+
   Scenario: Attempting to delete a theme that doesn't exist
     When I run `wp theme delete p2`
     Then STDOUT should not be empty

src/Theme_Command.php

@@ -753,9 +753,15 @@ public function is_active( $args, $assoc_args = array() ) {
 	 *
 	 * ## OPTIONS
 	 *
-	 * <theme>...
+	 * [<theme>...]
 	 * : One or more themes to delete.
 	 *
+	 * [--all]
+	 * : If set, all themes will be deleted except active theme.
+	 *
+	 * [--force]
+	 * : To delete active theme use this.
+	 *
 	 * ## EXAMPLES
 	 *
 	 *     $ wp theme delete twentytwelve
@@ -764,12 +770,21 @@ public function is_active( $args, $assoc_args = array() ) {
 	 *
 	 * @alias uninstall
 	 */
-	public function delete( $args ) {
+	public function delete( $args, $assoc_args ) {
+
+		$all = Utils\get_flag_value( $assoc_args, 'all', false );
+
+		if ( ! ( $args = $this->check_optional_args_and_all( $args, $all, 'delete' ) ) ) {
+			return;
+		}
+
+		$force = Utils\get_flag_value( $assoc_args, 'force', false );
+
 		$successes = $errors = 0;
 		foreach ( $this->fetcher->get_many( $args ) as $theme ) {
 			$theme_slug = $theme->get_stylesheet();
 
-			if ( $this->is_active_theme( $theme ) ) {
+			if ( $this->is_active_theme( $theme ) && ! $force ) {
 				WP_CLI::warning( "Can't delete the currently active theme: $theme_slug" );
 				$errors++;
 				continue;
@@ -870,18 +885,18 @@ private function check_optional_args_and_all( $args, $all ) {
 
 		return $args;
 	}
-	
+
 	/**
 	 * Gets the template path based on installation type.
 	 */
 	private static function get_template_path( $template ) {
 		$command_root = Utils\phar_safe_path( dirname( __DIR__ ) );
 		$template_path = "{$command_root}/templates/{$template}";
-		
+
 		if ( ! file_exists( $template_path ) ) {
 			WP_CLI::error( "Couldn't find {$template}" );
 		}
-		
+
 		return $template_path;
 	}
 }