Blog relative paths

I have site accessed via several hosts, like
http://ru.site/
http://en.site/
etc, and want to have wordpress works fine on that setup, but it require full path for site_url.

so, i have made micro patch to
wp-includes/canonical.php

in function redirect_canonical(…)
in bottom, changed from

if ( array($original['host'], $original['port'], $original['path'], $original['query']) !== array($redirect['host'], $redirect['port'], $redirect['path'], $redirect['query']) ) {
        $redirect_url = $redirect['scheme'] . '://' . $redirect['host'];
        if ( isset($redirect['port']) )
            $redirect_url .= ':' . $redirect['port'];
        $redirect_url .= $redirect['path'];
        if ( $redirect['query'] )
            $redirect_url .= '?' . $redirect['query'];
    }

to

if ( $redirect['host'] && array($original['host'], $original['port'], $original['path'], $original['query']) !== array($redirect['host'], $redirect['port'], $redirect['path'], $redirect['query']) ) {
        if ($redirect['host']) {
          $redirect_url = $redirect['scheme'] . '://' . $redirect['host'];
          if ( isset($redirect['port']) )
              $redirect_url .= ':' . $redirect['port'];
        } else {
          $redirect_url = "";
        }
        $redirect_url .= $redirect['path'];
        if ( $redirect['query'] )
            $redirect_url .= '?' . $redirect['query'];
    }

and now can setup siteurl as /wp
and it works fine —
http://ru.site/wp/
http://en.site/wp/
shows same site without redirects, and in wp-config i can change language based on $_SERVER[‘HTTP_HOST’]

🙂