Post-Status change detection for Email Post Changes 1.7

    function post_updated( $post_id, $post_after, $post_before ) {
        $options = $this->get_options();
        // If we're purely saving a draft, and don't have the draft option enabled, skip. If we're transitioning one way or the other, send a notification.
        if ( 0 == $options['drafts'] && 'draft' == $post_before->post_status && 'draft' == $post_after->post_status )
            return;

        if ( isset( $_POST['autosave'] ) )
            return;

        if ( !in_array( $post_before->post_type, $options['post_types'] ) )
            return;

        $this->left_post = $post_before;
        $this->right_post = $post_after;

        // If this is a new post, set an empty title for $this->left_post so that it appears in the diff.
                $child_posts = wp_get_post_revisions( $post_id, array( 'numberposts' => 1 ) );
                if ( count( $child_posts ) == 0 ) {
            $this->left_post->post_title = '';
        }

        if ( !$this->left_post || !$this->right_post )
            return;

        $html_diffs = array();
        $text_diffs = array();
        $identical = true;
        foreach ( _wp_post_revision_fields() as $field => $field_title ) {
            $left = apply_filters( "_wp_post_revision_field_$field", $this->left_post->$field, $field );
            $right = apply_filters( "_wp_post_revision_field_$field", $this->right_post->$field, $field );

            if ( !$diff = $this->wp_text_diff( $left, $right ) )
                continue;
            $html_diffs[$field_title] = $diff;

            $left  = normalize_whitespace( $left );
            $right = normalize_whitespace( $right );

            $left_lines  = explode( "\n", $left );
            $right_lines = explode( "\n", $right );

            require_once( dirname( __FILE__ ) . '/unified.php' );

            $text_diff = new Text_Diff( $left_lines, $right_lines );
            $renderer  = new Text_Diff_Renderer_unified();
            $text_diffs[$field_title] = $renderer->render($text_diff);

            $identical = false;
        }

        // Ov3rfly: Detect draft to publish or similar
        $post_status_left = $post_status_right = '';
        if ( $this->left_post->post_status != $this->right_post->post_status ) {
            $post_status_left = $post_status_right = '<br />' . __( 'Status' ) . ': ';
            $post_status_left .= $this->nice_post_status( $this->left_post->post_status );
            $post_status_right .= $this->nice_post_status( $this->right_post->post_status );

            $identical = false;
        }

        if ( $identical ) {
            $this->left_post = null;
            $this->right_post = null;
            return;
        }

        // Grab the meta data
        $the_author = get_the_author_meta( 'display_name', get_current_user_id() ); // The revision
        $the_title = get_the_title( $this->right_post->ID ); // New title (may be same as old title)
        $the_date = gmdate( 'j F, Y \a\t G:i \U\T\C', strtotime( $this->right_post->post_modified_gmt . '+0000' ) ); // Modified time
        $the_permalink = clean_url( get_permalink( $this->right_post->ID ) );
        $the_edit_link = clean_url( get_edit_post_link( $this->right_post->ID ) );

        $left_title = __( 'Revision' );
        $right_title = sprintf( __( 'Current %s' ), $post_type = ucfirst( $this->right_post->post_type ) );

        $head_sprintf = __( '%s made the following changes to the %s %s on %s' );


        // HTML
        $html_diff_head  = '<h2>' . sprintf( __( '%s changed' ), $post_type ) . "</h2>\n";
        $html_diff_head .= '<p>' . sprintf( $head_sprintf,
            esc_html( $the_author ),
            sprintf( _x( '&#8220;%s&#8221; [%s]', '1 = link, 2 = "edit"' ),
                "<a href='$the_permalink'>" . esc_html( $the_title ) . '</a>',
                "<a href='$the_edit_link'>" . __( 'edit' ) . '</a>'
            ),
            $this->right_post->post_type,
            $the_date
        ) . "</p>\n\n";

        $html_diff_head .= "<table style='width: 100%; border-collapse: collapse; border: none;'><tr>\n";
        // Ov3rfly: added $post_status_left and $post_status_right
        $html_diff_head .= "<td style='width: 50%; padding: 0; margin: 0;'>" . esc_html( $left_title ) . ' @ ' . esc_html( $this->left_post->post_date_gmt ) . $post_status_left . "</td>\n";
        $html_diff_head .= "<td style='width: 50%; padding: 0; margin: 0;'>" . esc_html( $right_title ) . ' @ ' . esc_html( $this->right_post->post_modified_gmt ) . $post_status_right . "</td>\n";

        $html_diff_head .= "</tr></table>\n\n";

        $html_diff = '';
        foreach ( $html_diffs as $field_title => $diff ) {
            $html_diff .= '<h3>' . esc_html( $field_title ) . "</h3>\n";
            $html_diff .= "$diff\n\n";
        }

        $html_diff = rtrim( $html_diff );

        // Replace classes with inline style
        $html_diff = str_replace( "class='diff'", 'style="width: 100%; border-collapse: collapse; border: none; white-space: pre-wrap; word-wrap: break-word; font-family: Consolas,Monaco,Courier,monospace;"', $html_diff );
        $html_diff = preg_replace( '#<col[^>]+/?>#i', '', $html_diff );
        $html_diff = str_replace( "class='diff-deletedline'", 'style="padding: 5px; width: 50%; background-color: #fdd;"', $html_diff );
        $html_diff = str_replace( "class='diff-addedline'", 'style="padding: 5px; width: 50%; background-color: #dfd;"', $html_diff );
        $html_diff = str_replace( "class='diff-context'", 'style="padding: 5px; width: 50%;"', $html_diff );
        $html_diff = str_replace( '<td>', '<td style="padding: 5px;">', $html_diff );
        $html_diff = str_replace( '<del>', '<del style="text-decoration: none; background-color: #f99;">', $html_diff );
        $html_diff = str_replace( '<ins>', '<ins style="text-decoration: none; background-color: #9f9;">', $html_diff );
        $html_diff = str_replace( array( '</td>', '</tr>', '</tbody>' ), array( "</td>\n", "</tr>\n", "</tbody>\n" ), $html_diff );

        $html_diff = $html_diff_head . $html_diff;


        // Refactor some of the meta data for TEXT
        $length = max( strlen( $left_title ), strlen( $right_title ) );
        $left_title = str_pad( $left_title, $length + 2 );
        $right_title = str_pad( $right_title, $length + 2 );

        // TEXT
        $text_diff  = sprintf( $head_sprintf, $the_author, '"' . $the_title . '"', $this->right_post->post_type, $the_date ) . "\n";
        $text_diff .= "URL:  $the_permalink\n";
        $text_diff .= "Edit: $the_edit_link\n\n";

        foreach ( $text_diffs as $field_title => $diff ) {
            $text_diff .= "$field_title\n";
            $text_diff .= "===================================================================\n";
            $text_diff .= "--- $left_title  ({$this->left_post->post_date_gmt})\n";
            $text_diff .= "+++ $right_title ({$this->right_post->post_modified_gmt})\n";
            // Ov3rfly:
            if ( !empty( $post_status_left ) && !empty( $post_status_right ) ) {
                $text_diff .= "--- " . strip_tags( $post_status_left ) . "\n";
                $text_diff .= "+++ " . strip_tags( $post_status_right ) . "\n";
            }
            $text_diff .= "$diff\n\n";
        }

        $this->text_diff = $text_diff = rtrim( $text_diff );


        // Send email
        $charset = apply_filters( 'wp_mail_charset', get_option( 'blog_charset' ) );
        $blogname = html_entity_decode( get_option( 'blogname' ), ENT_QUOTES, $charset );
        $title = html_entity_decode( $the_title, ENT_QUOTES, $charset );

        add_action( 'phpmailer_init', array( $this, 'phpmailer_init_once' ) );

        wp_mail(
            null, // see hack in ::phpmailer_init_once()
            sprintf( __( '[%s] %s changed: %s' ), $blogname, $post_type, $title ),
            $html_diff
        );

        $this->left_post = null;
        $this->right_post = null;

        do_action( 'email_post_changes_email_sent' );
    }

    // Ov3rfly:
    function nice_post_status( $post_status ) {
        $nice = 'Unknown';
        switch( $post_status ) {
        case 'publish':
            $nice = _x( 'Published', 'post' );
            break;
        case 'future':
            $nice = _x( 'Scheduled', 'post' );
            break;
        case 'draft':
            $nice = _x( 'Draft', 'post' );
            break;
        case 'pending':
            $nice = _x( 'Pending', 'post' );
            break;
        case 'private':
            $nice = _x( 'Private', 'post' );
            break;
        case 'trash':
            $nice = _x( 'Trash', 'post' );
            break;
        case 'auto-draft':
        case 'inherit':
            $nice = $post_status;
            break;
        }
        return $nice;
    }