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<?php
/**
* Revisions administration panel.
*
* @package WordPress
* @subpackage Administration
*/

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

wp_enqueue_script('list-revisions');

wp_reset_vars(array('revision', 'left', 'right', 'action'));

$revision_id = absint($revision);
$left = absint($left);
$right = absint($right);

$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;

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

check_admin_referer( "restore-post_$post->ID|$revision->ID" );

wp_restore_post_revision( $revision->ID );
$redirect = add_query_arg( array( 'message' => 5, 'revision' => $revision->ID ), get_edit_post_link( $post->ID, 'url' ) );
break;
case 'diff' :
if ( !$left_revision = get_post( $left ) )
break;
if ( !$right_revision = get_post( $right ) )
break;

if ( !current_user_can( 'read_post', $left_revision->ID ) || !current_user_can( 'read_post', $right_revision->ID ) )
break;

// If we're comparing a revision to itself, redirect to the 'view' page for that revision or the edit page for that post
if ( $left_revision->ID == $right_revision->ID ) {
$redirect = get_edit_post_link( $left_revision->ID );
include( './js/revisions-js.php' );
break;
}

// Don't allow reverse diffs?
if ( strtotime($right_revision->post_modified_gmt) < strtotime($left_revision->post_modified_gmt) ) {
$redirect = add_query_arg( array( 'left' => $right, 'right' => $left ) );
break;
}

if ( $left_revision->ID == $right_revision->post_parent ) // right is a revision of left
$post =& $left_revision;
elseif ( $left_revision->post_parent == $right_revision->ID ) // left is a revision of right
$post =& $right_revision;
elseif ( $left_revision->post_parent == $right_revision->post_parent ) // both are revisions of common parent
$post = get_post( $left_revision->post_parent );
else
break; // Don't diff two unrelated revisions

if ( ! WP_POST_REVISIONS || !post_type_supports($post->post_type, 'revisions') ) { // Revisions disabled
if (
// we're not looking at an autosave
( !wp_is_post_autosave( $left_revision ) && !wp_is_post_autosave( $right_revision ) )
||
// we're not comparing an autosave to the current post
( $post->ID !== $left_revision->ID && $post->ID !== $right_revision->ID )
) {
$redirect = 'edit.php?post_type=' . $post->post_type;
break;
}
}

if (
// They're the same
$left_revision->ID == $right_revision->ID
||
// Neither is a revision
( !wp_get_post_revision( $left_revision->ID ) && !wp_get_post_revision( $right_revision->ID ) )
)
break;

$post_title = '<a href="' . get_edit_post_link() . '">' . get_the_title() . '</a>';
$h2 = sprintf( __( 'Compare Revisions of &#8220;%1$s&#8221;' ), $post_title );
$title = __( 'Revisions' );

$left = $left_revision->ID;
$right = $right_revision->ID;

$redirect = false;
break;
case 'view' :
default :
if ( !$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( 'read_post', $post->ID ) )
break;

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

$post_title = '<a href="' . get_edit_post_link() . '">' . get_the_title() . '</a>';
$revision_title = wp_post_revision_title( $revision, false );
$h2 = sprintf( __( 'Revision for &#8220;%1$s&#8221; created on %2$s' ), $post_title, $revision_title );
$title = __( 'Revisions' );

// Sets up the diff radio buttons
$left = $revision->ID;
$right = $post->ID;

$redirect = false;
break;
endswitch;

// 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';

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

?>

<div class="wrap">

<h2 class="long-header"><?php echo $h2; ?></h2>

<table class="form-table ie-fixed">
<col class="th" />
<?php if ( 'diff' == $action ) : ?>
<tr id="revision">
<th scope="row"></th>
<th scope="col" class="th-full">
<span class="alignleft"><?php printf( __('Older: %s'), wp_post_revision_title( $left_revision ) ); ?></span>
<span class="alignright"><?php printf( __('Newer: %s'), wp_post_revision_title( $right_revision ) ); ?></span>
</th>
</tr>
<?php endif;

// use get_post_to_edit filters?
$identical = true;
foreach ( _wp_post_revision_fields() as $field => $field_title ) :
if ( 'diff' == $action ) {
$left_content = apply_filters( "_wp_post_revision_field_$field", $left_revision->$field, $field );
$right_content = apply_filters( "_wp_post_revision_field_$field", $right_revision->$field, $field );
if ( !$content = wp_text_diff( $left_content, $right_content ) )
continue; // There is no difference between left and right
$identical = false;
} else {
add_filter( "_wp_post_revision_field_$field", 'htmlspecialchars' );
$content = apply_filters( "_wp_post_revision_field_$field", $revision->$field, $field );
}
?>

<tr id="revision-field-<?php echo $field; ?>">
<th scope="row"><?php echo esc_html( $field_title ); ?></th>
<td><div class="pre"><?php echo $content; ?></div></td>
</tr>

<?php

endforeach;

if ( 'diff' == $action && $identical ) :

?>

<tr><td colspan="2"><div class="updated"><p><?php _e( 'These revisions are identical.' ); ?></p></div></td></tr>

<?php

endif;

?>

</table>

<br class="clear" />

<h3><?php echo $title; ?></h3>

<?php

$args = array( 'format' => 'form-table', 'parent' => true, 'right' => $right, 'left' => $left );
if ( ! WP_POST_REVISIONS || !post_type_supports($post->post_type, 'revisions') )
$args['type'] = 'autosave';

wp_list_post_revisions( $post, $args );

?>

</div>

<?php
require_once( './admin-footer.php' );
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