Index: src/wp-login.php
===================================================================
--- src/wp-login.php	(revision 25699)
+++ src/wp-login.php	(working copy)
@@ -23,19 +23,11 @@
 }
 
 /**
- * Outputs the header for the login page.
+ * Output the header for the login page.
  *
- * @uses do_action() Calls the 'login_head' for outputting HTML in the Log In
- *		header.
- * @uses apply_filters() Calls 'login_headerurl' for the top login link.
- * @uses apply_filters() Calls 'login_headertitle' for the top login title.
- * @uses apply_filters() Calls 'login_message' on the message to display in the
- *		header.
- * @uses $error The error global, which is checked for displaying errors.
- *
- * @param string $title Optional. WordPress Log In Page title to display in
- *		<title/> element.
- * @param string $message Optional. Message to display in header.
+ * @param string $title    Optional. WordPress Log In Page title to display in <title/> element. Default 'Log In'.
+ * @param string $message  Optional. Message to display in header. Default empty.
+ * @param string $wp_error Optional. The error to pass. Default empty.
  * @param WP_Error $wp_error Optional. WordPress Error Object
  */
 function login_header($title = 'Log In', $message = '', $wp_error = '') {
@@ -52,6 +44,13 @@
 
 	// Shake it!
 	$shake_error_codes = array( 'empty_password', 'empty_email', 'invalid_email', 'invalidcombo', 'empty_username', 'invalid_username', 'incorrect_password' );
+	/**
+	 * Filter the error codes array for shaking the login form.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param array $shake_error_codes Error codes that shake the login form.
+	 */
 	$shake_error_codes = apply_filters( 'shake_error_codes', $shake_error_codes );
 
 	if ( $shake_error_codes && $wp_error->get_error_code() && in_array( $wp_error->get_error_code(), $shake_error_codes ) )
@@ -76,7 +75,17 @@
 		<?php
 	}
 
+	/**
+	 * Enqueue scripts and styles for the login page.
+	 *
+	 * @since 3.1.0
+	 */
 	do_action( 'login_enqueue_scripts' );
+	/**
+	 * Fires in the login page header after scripts are enqueued.
+	 *
+	 * @since 2.1.0
+	 */
 	do_action( 'login_head' );
 
 	if ( is_multisite() ) {
@@ -87,7 +96,21 @@
 		$login_header_title = __( 'Powered by WordPress' );
 	}
 
-	$login_header_url   = apply_filters( 'login_headerurl',   $login_header_url   );
+	/**
+	 * Filter link URL of the header logo above login form.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $login_header_url Login header logo URL.
+	 */
+	$login_header_url = apply_filters( 'login_headerurl', $login_header_url );
+	/**
+	 * Filter the title attribute of the header logo above login form.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $login_header_title Login header logo title attribute.
+	 */
 	$login_header_title = apply_filters( 'login_headertitle', $login_header_title );
 
 	$classes = array( 'login-action-' . $action, 'wp-core-ui' );
@@ -105,6 +128,14 @@
 			$classes[] = 'interim-login-success';
 	}
 
+	/**
+	 * Filter the login page body classes.
+	 *
+	 * @since 3.5.0
+	 *
+	 * @param array  $classes An array of body classes.
+	 * @param string $action  The action that brought the visitor to the login page.
+	 */
 	$classes = apply_filters( 'login_body_class', $classes, $action );
 
 	?>
@@ -116,7 +147,14 @@
 
 	unset( $login_header_url, $login_header_title );
 
-	$message = apply_filters('login_message', $message);
+	/**
+	 * Filter the message to display above the login form.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $message Login message text.
+	 */
+	$message = apply_filters( 'login_message', $message );
 	if ( !empty( $message ) )
 		echo $message . "\n";
 
@@ -138,10 +176,26 @@
 					$errors .= '	' . $error . "<br />\n";
 			}
 		}
-		if ( !empty($errors) )
-			echo '<div id="login_error">' . apply_filters('login_errors', $errors) . "</div>\n";
-		if ( !empty($messages) )
-			echo '<p class="message">' . apply_filters('login_messages', $messages) . "</p>\n";
+		if ( ! empty( $errors ) ) {
+			/**
+			 * Filter the error messages displayed above the login form.
+			 *
+			 * @since 2.1.0
+			 *
+			 * @param string $errors Login error message.
+			 */
+			echo '<div id="login_error">' . apply_filters( 'login_errors', $errors ) . "</div>\n";
+		}
+		if ( ! empty( $messages ) ) {
+			/**
+			 * Filter instructional messages displayed above the login form.
+			 *
+			 * @since 2.5.0
+			 *
+			 * @param string $messages Login messages.
+			 */
+			echo '<p class="message">' . apply_filters( 'login_messages', $messages ) . "</p>\n";
+		}
 	}
 } // End of login_header()
 
@@ -167,7 +221,13 @@
 	</script>
 	<?php endif; ?>
 
-	<?php do_action('login_footer'); ?>
+	<?php
+	/**
+	 * Fires in the login page footer.
+	 *
+	 * @since 3.1.0
+	 */
+	do_action( 'login_footer' ); ?>
 	<div class="clear"></div>
 	</body>
 	</html>
@@ -217,7 +277,12 @@
 		$user_data = get_user_by('login', $login);
 	}
 
-	do_action('lostpassword_post');
+	/**
+	 * Fires before errors are returned from a password reset request.
+	 *
+	 * @since 2.1.0
+	 */
+	do_action( 'lostpassword_post' );
 
 	if ( $errors->get_error_code() )
 		return $errors;
@@ -231,10 +296,33 @@
 	$user_login = $user_data->user_login;
 	$user_email = $user_data->user_email;
 
-	do_action('retreive_password', $user_login);  // Misspelled and deprecated
-	do_action('retrieve_password', $user_login);
+	/**
+	 * Fires before a new password is retrieved.
+	 *
+	 * @since 1.5.2
+	 * @deprecated 1.5.2 Misspelled. Use 'retrieve_password' hook instead.
+	 *
+	 * @param string $user_login The user login name.
+	 */
+	do_action( 'retreive_password', $user_login );
+	/**
+	 * Fires before a new password is retrieved.
+	 *
+	 * @since 1.5.2
+	 *
+	 * @param string $user_login The user login name.
+	 */
+	do_action( 'retrieve_password', $user_login );
 
-	$allow = apply_filters('allow_password_reset', true, $user_data->ID);
+	/**
+	 * Filter whether to allow a password to be reset.
+	 *
+	 * @since 2.7.0
+	 *
+	 * @param bool true           Whether to allow the password to be reset. Default true.
+	 * @param int  $user_data->ID The ID of the user attempting to reset a password.
+	 */
+	$allow = apply_filters( 'allow_password_reset', true, $user_data->ID );
 
 	if ( ! $allow )
 		return new WP_Error('no_password_reset', __('Password reset is not allowed for this user'));
@@ -278,8 +366,23 @@
 
 	$title = sprintf( __('[%s] Password Reset'), $blogname );
 
-	$title = apply_filters('retrieve_password_title', $title);
-	$message = apply_filters('retrieve_password_message', $message, $key);
+	/**
+	 * Filter the subject of the password reset email.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param string $title Default email title.
+	 */
+	$title = apply_filters( 'retrieve_password_title', $title );
+	/**
+	 * Filter the message body of the password reset mail.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param string $message Default mail message.
+	 * @param string $key     The activation key.
+	 */
+	$message = apply_filters( 'retrieve_password_message', $message, $key );
 
 	if ( $message && !wp_mail($user_email, $title, $message) )
 		wp_die( __('The e-mail could not be sent.') . "<br />\n" . __('Possible reason: your host may have disabled the mail() function.') );
@@ -319,8 +422,21 @@
 if ( SITECOOKIEPATH != COOKIEPATH )
 	setcookie(TEST_COOKIE, 'WP Cookie check', 0, SITECOOKIEPATH, COOKIE_DOMAIN);
 
-// allow plugins to override the default actions, and to add extra actions if they want
+/**
+ * Fires when the login form is initialized.
+ * 
+ * @since 3.2.0
+ */
 do_action( 'login_init' );
+/**
+ * Fires before a specified login form action.
+ *
+ * The dynamic portion of the hook name, $action, refers to the action
+ * that brought the visitor to the login form. Actions include 'postpass',
+ * 'logout', 'lostpassword', etc.
+ * 
+ * @since 2.8.0
+ */
 do_action( 'login_form_' . $action );
 
 $http_post = ('POST' == $_SERVER['REQUEST_METHOD']);
@@ -333,12 +449,13 @@
 	$hasher = new PasswordHash( 8, true );
 
 	/**
-	 * Filter the life of the post password cookie.
+	 * Filter the life span of the post password cookie.
 	 *
-	 * By default, the cookie expires 10 days from now.
-	 * To turn this into a session cookie, return 0.
+	 * By default, the cookie expires 10 days from creation. To turn this
+	 * into a session cookie, return 0.
 	 *
 	 * @since 3.7.0
+	 *
 	 * @param int $expires The expiry time, as passed to setcookie().
 	 */
 	$expire = apply_filters( 'post_password_expires', time() + 10 * DAY_IN_SECONDS );
@@ -378,9 +495,23 @@
 			$errors->add( 'expiredkey', __( 'Sorry, that key has expired. Please try again.' ) );
 	}
 
-	$redirect_to = apply_filters( 'lostpassword_redirect', !empty( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : '' );
+	$lostpassword_redirect = ! empty( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : '';
+	/**
+	 * Filter the URL redirected to after submitting the lostpassword/retrievepassword form.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param string $lostpassword_redirect The redirect destination URL.
+	 */
+	$redirect_to = apply_filters( 'lostpassword_redirect', $lostpassword_redirect );
 
-	do_action('lost_password');
+	/**
+	 * Fires before the lost password form.
+	 *
+	 * @since 1.5.2
+	 */
+	do_action( 'lost_password' );
+
 	login_header(__('Lost Password'), '<p class="message">' . __('Please enter your username or email address. You will receive a link to create a new password via email.') . '</p>', $errors);
 
 	$user_login = isset($_POST['user_login']) ? wp_unslash($_POST['user_login']) : '';
@@ -392,16 +523,32 @@
 		<label for="user_login" ><?php _e('Username or E-mail:') ?><br />
 		<input type="text" name="user_login" id="user_login" class="input" value="<?php echo esc_attr($user_login); ?>" size="20" /></label>
 	</p>
-<?php do_action('lostpassword_form'); ?>
+	<?php
+	/**
+	 * Fires inside the lostpassword <form> tags, before the hidden fields.
+	 *
+	 * @since 2.1.0
+	 */
+	do_action( 'lostpassword_form' ); ?>
 	<input type="hidden" name="redirect_to" value="<?php echo esc_attr( $redirect_to ); ?>" />
 	<p class="submit"><input type="submit" name="wp-submit" id="wp-submit" class="button button-primary button-large" value="<?php esc_attr_e('Get New Password'); ?>" /></p>
 </form>
 
 <p id="nav">
 <a href="<?php echo esc_url( wp_login_url() ); ?>"><?php _e('Log in') ?></a>
-<?php if ( get_option( 'users_can_register' ) ) : ?>
- | <?php echo apply_filters( 'register', sprintf( '<a href="%s">%s</a>', esc_url( wp_registration_url() ), __( 'Register' ) ) ); ?>
-<?php endif; ?>
+<?php
+if ( get_option( 'users_can_register' ) ) :
+	$registration_url = sprintf( '<a href="%s">%s</a>', esc_url( wp_registration_url() ), __( 'Register' ) );
+	/**
+	 * Filter the registration URL below the login form.
+	 *
+	 * @since 1.5.2
+	 *
+	 * @param string $registration_url Registration URL.
+	 */
+	echo ' | ' . apply_filters( 'register', $registration_url );
+endif;
+?>
 </p>
 
 <?php
@@ -425,6 +572,14 @@
 	if ( isset($_POST['pass1']) && $_POST['pass1'] != $_POST['pass2'] )
 		$errors->add( 'password_reset_mismatch', __( 'The passwords do not match.' ) );
 
+	/**
+	 * Fires before the password reset procedure is validated.
+	 * 
+	 * @since 3.5.0
+	 *
+	 * @param object           $errors WP Error object.
+	 * @param WP_User|WP_Error $user   WP_User object if the login and reset key match. WP_Error object otherwise.
+	 */
 	do_action( 'validate_password_reset', $errors, $user );
 
 	if ( ( ! $errors->get_error_code() ) && isset( $_POST['pass1'] ) && !empty( $_POST['pass1'] ) ) {
@@ -461,9 +616,13 @@
 
 <p id="nav">
 <a href="<?php echo esc_url( wp_login_url() ); ?>"><?php _e( 'Log in' ); ?></a>
-<?php if ( get_option( 'users_can_register' ) ) : ?>
- | <?php echo apply_filters( 'register', sprintf( '<a href="%s">%s</a>', esc_url( wp_registration_url() ), __( 'Register' ) ) ); ?>
-<?php endif; ?>
+<?php
+if ( get_option( 'users_can_register' ) ) :
+	$registration_url = sprintf( '<a href="%s">%s</a>', esc_url( wp_registration_url() ), __( 'Register' ) );
+	//duplicate_hook
+	echo ' | ' . apply_filters( 'register', $registration_url );
+endif;
+?>
 </p>
 
 <?php
@@ -472,8 +631,15 @@
 
 case 'register' :
 	if ( is_multisite() ) {
-		// Multisite uses wp-signup.php
-		wp_redirect( apply_filters( 'wp_signup_location', network_site_url('wp-signup.php') ) );
+		$sign_up_url = network_site_url( 'wp-signup.php' );
+		/**
+		 * Filter the Multisite sign up URL.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param string $sign_up_url The sign up URL.
+		 */
+		wp_redirect( apply_filters( 'wp_signup_location', $sign_up_url ) );
 		exit;
 	}
 
@@ -495,7 +661,15 @@
 		}
 	}
 
-	$redirect_to = apply_filters( 'registration_redirect', !empty( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : '' );
+	$registration_redirect = ! empty( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : '';
+	/**
+	 * Filter the registration redirect URL.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param string $registration_redirect The redirect destination URL.
+	 */
+	$redirect_to = apply_filters( 'registration_redirect', $registration_redirect );
 	login_header(__('Registration Form'), '<p class="message register">' . __('Register For This Site') . '</p>', $errors);
 ?>
 
@@ -508,7 +682,14 @@
 		<label for="user_email"><?php _e('E-mail') ?><br />
 		<input type="text" name="user_email" id="user_email" class="input" value="<?php echo esc_attr(wp_unslash($user_email)); ?>" size="25" /></label>
 	</p>
-<?php do_action('register_form'); ?>
+	<?php
+	/**
+	 * Fires following the 'E-mail' field in the user registration form.
+	 *
+	 * @since 2.1.0
+	 */
+	do_action( 'register_form' );
+	?>
 	<p id="reg_passmail"><?php _e('A password will be e-mailed to you.') ?></p>
 	<br class="clear" />
 	<input type="hidden" name="redirect_to" value="<?php echo esc_attr( $redirect_to ); ?>" />
@@ -565,7 +746,17 @@
 	else
 		$user = wp_signon('', $secure_cookie);
 
-	$redirect_to = apply_filters('login_redirect', $redirect_to, isset( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : '', $user);
+	$requested_redirect_to = isset( $_REQUEST['redirect_to'] ) ? $_REQUEST['redirect_to'] : '';
+	/**
+	 * Filter the login redirect URL.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param string           $redirect_to           The redirect destination URL.
+	 * @param string           $requested_redirect_to The requested redirect destination URL passed as a parameter.
+	 * @param WP_User|WP_Error $user                  WP_User object if login was successful, WP_Error object otherwise.
+	 */
+	$redirect_to = apply_filters( 'login_redirect', $redirect_to, $requested_redirect_to, $user );
 
 	if ( !is_wp_error($user) && !$reauth ) {
 		if ( $interim_login ) {
@@ -573,7 +764,9 @@
 			$interim_login = 'success';
 			login_header( '', $message ); ?>
 			</div>
-			<?php do_action( 'login_footer' ); ?>
+			<?php
+			//duplicate_hook
+			do_action( 'login_footer' ); ?>
 			<?php if ( $customize_login ) : ?>
 				<script type="text/javascript">setTimeout( function(){ new wp.customize.Messenger({ url: '<?php echo wp_customize_url(); ?>', channel: 'login' }).send('login') }, 1000 );</script>
 			<?php endif; ?>
@@ -618,6 +811,14 @@
 			$errors->add('updated', __( '<strong>You have successfully updated WordPress!</strong> Please log back in to experience the awesomeness.' ), 'message' );
 	}
 
+	/**
+	 * Filter the login page errors.
+	 *
+	 * @since 3.6.0
+	 *
+	 * @param object $errors      WP Error object.
+	 * @param string $redirect_to Redirect destination URL.
+	 */
 	$errors = apply_filters( 'wp_login_errors', $errors, $redirect_to );
 
 	// Clear any stale cookies.
@@ -640,7 +841,14 @@
 		<label for="user_pass"><?php _e('Password') ?><br />
 		<input type="password" name="pwd" id="user_pass" class="input" value="" size="20" /></label>
 	</p>
-<?php do_action('login_form'); ?>
+	<?php
+	/**
+	 * Fires following the 'Password' field in the login form.
+	 *
+	 * @since 2.1.0
+	 */
+	do_action( 'login_form' );
+	?>
 	<p class="forgetmenot"><label for="rememberme"><input name="rememberme" type="checkbox" id="rememberme" value="forever" <?php checked( $rememberme ); ?> /> <?php esc_attr_e('Remember Me'); ?></label></p>
 	<p class="submit">
 		<input type="submit" name="wp-submit" id="wp-submit" class="button button-primary button-large" value="<?php esc_attr_e('Log In'); ?>" />
@@ -658,10 +866,13 @@
 
 <?php if ( ! $interim_login ) { ?>
 <p id="nav">
-<?php if ( ! isset( $_GET['checkemail'] ) || ! in_array( $_GET['checkemail'], array( 'confirm', 'newpass' ) ) ) : ?>
-	<?php if ( get_option( 'users_can_register' ) ) : ?>
-		<?php echo apply_filters( 'register', sprintf( '<a href="%s">%s</a>', esc_url( wp_registration_url() ), __( 'Register' ) ) ); ?> |
-	<?php endif; ?>
+<?php if ( ! isset( $_GET['checkemail'] ) || ! in_array( $_GET['checkemail'], array( 'confirm', 'newpass' ) ) ) :
+	if ( get_option( 'users_can_register' ) ) :
+		$registration_url = sprintf( '<a href="%s">%s</a>', esc_url( wp_registration_url() ), __( 'Register' ) );
+		//duplicate_hook
+		echo apply_filters( 'register', $registration_url ) . ' | ';
+	endif;
+	?>
 	<a href="<?php echo esc_url( wp_lostpassword_url() ); ?>" title="<?php esc_attr_e( 'Password Lost and Found' ); ?>"><?php _e( 'Lost your password?' ); ?></a>
 <?php endif; ?>
 </p>
