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revision.php

<?php
/**
 * Revisions administration panel
 *
 * Requires site-admin/includes/revision.php.
 *
 * @package WordPress
 * @subpackage Administration
 * @since 2.6.0
 */

/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );

require ABSPATH . 'site-admin/includes/revision.php';

/**
 * @global int    $revision Optional. The revision ID.
 * @global string $action   The action to take.
 *                          Accepts 'restore', 'view' or 'edit'.
 * @global int    $from     The revision to compare from.
 * @global int    $to       Optional, required if revision missing. The revision to compare to.
 */
wp_reset_vars( array( 'revision', 'action', 'from', 'to' ) );

$revision_id = absint( $revision );

$from = is_numeric( $from ) ? absint( $from ) : null;
if ( ! $revision_id ) {
	$revision_id = absint( $to );
}
$redirect = 'edit.php';

switch ( $action ) {
	case 'restore':
		if ( ! $revision = wp_get_post_revision( $revision_id ) ) {
			break;
		}

if ( ! current_user_can( 'edit_post', $revision->post_parent ) ) {
			break;
		}

if ( ! $post = get_post( $revision->post_parent ) ) {
			break;
		}

// Restore if revisions are enabled or this is an autosave.
		if ( ! wp_revisions_enabled( $post ) && ! wp_is_post_autosave( $revision ) ) {
			$redirect = 'edit.php?post_type=' . $post->post_type;
			break;
		}

// Don't allow revision restore when post is locked
		if ( wp_check_post_lock( $post->ID ) ) {
			break;
		}

check_admin_referer( "restore-post_{$revision->ID}" );

wp_restore_post_revision( $revision->ID );
		$redirect = add_query_arg(
			array(
				'message'  => 5,
				'revision' => $revision->ID,
			),
			get_edit_post_link( $post->ID, 'url' )
		);
		break;
	case 'view':
	case 'edit':
	default:
		if ( ! $revision = wp_get_post_revision( $revision_id ) ) {
			break;
		}
		if ( ! $post = get_post( $revision->post_parent ) ) {
			break;
		}

if ( ! current_user_can( 'read_post', $revision->ID ) || ! current_user_can( 'edit_post', $revision->post_parent ) ) {
			break;
		}

// Revisions disabled and we're not looking at an autosave
		if ( ! wp_revisions_enabled( $post ) && ! wp_is_post_autosave( $revision ) ) {
			$redirect = 'edit.php?post_type=' . $post->post_type;
			break;
		}

$post_edit_link = get_edit_post_link();
		$post_title = '<a href="' . $post_edit_link . '">' . _draft_or_post_title() . '</a>';
		/* translators: %s: post title */
		$h1 = sprintf( __( 'Compare Revisions of &#8220;%s&#8221;' ), $post_title );
		$return_to_post = '<a href="' . $post_edit_link . '">' . __( '&larr; Return to editor' ) . '</a>';
		$title = __( 'Revisions' );

$redirect = false;
		break;
}

// Empty post_type means either malformed object found, or no valid parent was found.
if ( ! $redirect && empty( $post->post_type ) ) {
	$redirect = 'edit.php';
}

if ( ! empty( $redirect ) ) {
	wp_redirect( $redirect );
	exit;
}

// This is so that the correct "Edit" menu item is selected.
if ( ! empty( $post->post_type ) && 'post' != $post->post_type ) {
	$parent_file = $submenu_file = 'edit.php?post_type=' . $post->post_type;
} else {
	$parent_file = $submenu_file = 'edit.php';
}

wp_enqueue_script( 'revisions' );
wp_localize_script( 'revisions', '_wpRevisionsSettings', wp_prepare_revisions_for_js( $post, $revision_id, $from ) );

/* Revisions Help Tab */

$revisions_overview = '' . __( 'This screen is used for managing your content revisions.' ) . '';
$revisions_overview .= '' . __( 'Revisions are saved copies of your post or page, which are periodically created as you update your content. The red text on the left shows the content that was removed. The green text on the right shows the content that was added.' ) . '';
$revisions_overview .= '' . __( 'From this screen you can review, compare, and restore revisions:' ) . '';
$revisions_overview .= '<ul><li>' . __( 'To navigate between revisions, drag the slider handle left or right or use the Previous or Next buttons.' ) . '</li>';
$revisions_overview .= '<li>' . __( 'Compare two different revisions by selecting the &#8220;Compare any two revisions&#8221; box to the side.' ) . '</li>';
$revisions_overview .= '<li>' . __( 'To restore a revision, click Restore This Revision.' ) . '</li></ul>';

get_current_screen()->add_help_tab(
	array(
		'id'      => 'revisions-overview',
		'title'   => __( 'Overview' ),
		'content' => $revisions_overview,
	)
);

$revisions_sidebar = '' . __( 'For more information:' ) . '';
$revisions_sidebar .= '' . __( '<a href="https://sitepad.com/docs/Revision_Management">Revisions Management</a>' ) . '';
$revisions_sidebar .= '' . __( '<a href="https://sitepad.com/support/">Support Forums</a>' ) . '';

get_current_screen()->set_help_sidebar( $revisions_sidebar );

require_once( ABSPATH . 'site-admin/admin-header.php' );

<div class="wrap">
	<h1 class="long-header"><?php echo $h1; ?></h1>
	<?php echo $return_to_post; ?>
</div>
<?php
wp_print_revision_templates();

require_once( ABSPATH . 'site-admin/admin-footer.php' );

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