Add slug assoc arg

src/Site_Command.php

@@ -500,6 +500,9 @@ public function create( $args, $assoc_args ) {
 	 * default: 100
 	 * ---
 	 *
+	 * [--slug=<slug>]
+	 * : Path for the new site. Subdomain on subdomain installs, directory on subdirectory installs.
+	 *
 	 * [--email=<email>]
 	 * : Email for admin user. User will be created if none exists. Assignment to super admin if not included.
 	 *
@@ -535,10 +538,27 @@ public function generate( $args, $assoc_args ) {
 			'count'      => 100,
 			'email'      => '',
 			'network_id' => 1,
+			'slug'       => 'site',
 		];
 
 		$assoc_args = array_merge( $defaults, $assoc_args );
 
+		// Base.
+		$base = $assoc_args['slug'];
+		if ( preg_match( '|^([a-zA-Z0-9-])+$|', $base ) ) {
+			$base = strtolower( $base );
+		}
+
+		$is_subdomain_install = is_subdomain_install();
+		// If not a subdomain install, make sure the domain isn't a reserved word
+		if ( ! $is_subdomain_install ) {
+			// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- Calling WordPress native hook.
+			$subdirectory_reserved_names = apply_filters( 'subdirectory_reserved_names', [ 'page', 'comments', 'blog', 'files', 'feed' ] );
+			if ( in_array( $base, $subdirectory_reserved_names, true ) ) {
+				WP_CLI::error( 'The following words are reserved and cannot be used as blog names: ' . implode( ', ', $subdirectory_reserved_names ) );
+			}
+		}
+
 		// Network.
 		if ( ! empty( $assoc_args['network_id'] ) ) {
 			$network = $this->get_network( $assoc_args['network_id'] );
@@ -572,7 +592,7 @@ public function generate( $args, $assoc_args ) {
 		$user_id = email_exists( $email );
 		if ( ! $user_id ) {
 			$password = wp_generate_password( 24, false );
-			$user_id  = wpmu_create_user( 'site-admin', $password, $email );
+			$user_id  = wpmu_create_user( $base . '-admin', $password, $email );
 
 			if ( false === $user_id ) {
 				WP_CLI::error( "Can't create user." );
@@ -581,8 +601,6 @@ public function generate( $args, $assoc_args ) {
 			}
 		}
 
-		$is_subdomain_install = is_subdomain_install();
-
 		$format = Utils\get_flag_value( $assoc_args, 'format', 'progress' );
 
 		$notify = false;
@@ -591,18 +609,15 @@ public function generate( $args, $assoc_args ) {
 		}
 
 		for ( $index = 1; $index <= $limit; $index++ ) {
-			$base  = 'site' . $index;
-			$title = 'Site ' . $index;
-
-			$new_domain = '';
-			$path       = '';
+			$current_base  = $base . $index;
+			$title = ucfirst( $base ) . ' ' . $index;
 
 			if ( $is_subdomain_install ) {
-				$new_domain = $base . '.' . preg_replace( '|^www\.|', '', $network->domain );
+				$new_domain = $current_base . '.' . preg_replace( '|^www\.|', '', $network->domain );
 				$path       = $network->path;
 			} else {
 				$new_domain = $network->domain;
-				$path       = $network->path . $base . '/';
+				$path       = $network->path . $current_base . '/';
 			}
 
 			$wpdb->hide_errors();