Apply source node's input filter to new node's body text

Ok, I had a look at this. Problem is twofold:

1. Google strips line breaks. We can get around this by converting the string to HTML before we send it - this is around line 160:

      else {
        try {
          $gt = new Gtranslate;
          // we need to send HTML to Google to not lose formatting
          $body_markup = check_markup($node->body);
          $tbody = $gt->$func($body_markup);
          $new_node->body = $tbody;
        }
        catch (GTranslateException $ge) {
          // if there was a problem, pass the error to watchdog.
          $message = t('From GTranslate: ') . $ge->getMessage();
          watchdog(t('auto translate'), $message, array(), WATCHDOG_ERROR);
          // fall back to original node body.
          $new_node->body = $node->body;
        }

Now the $tbody variable has properly formed *mark-up* in the correct language coming back (so line breaks are there, but in the form of HTML <p> tags. But:

2. node.module then filters out the mark-up from Google again on node_save() and we're back to square one, no line breaks in translations. I've written this, which is a nasty but effective workaround for now:

      else {
        try {
          $gt = new Gtranslate;
          // we need to send HTML to Google to not lose formatting
          $body_markup = check_markup($node->body);
          $tbody = $gt->$func($body_markup);
          $tbody = str_replace('<p>', '', $tbody);
          $tbody = str_replace('</p>', "\n\n", $tbody);
          $tbody = str_replace('<br>', "\n", $tbody);
          $tbody = str_replace('<br/>', "\n", $tbody);
          $tbody = str_replace('<br />', "\n", $tbody);
          $new_node->body = $tbody;
        }
        catch (GTranslateException $ge) {
          // if there was a problem, pass the error to watchdog.
          $message = t('From GTranslate: ') . $ge->getMessage();
          watchdog(t('auto translate'), $message, array(), WATCHDOG_ERROR);
          // fall back to original node body.
          $new_node->body = $node->body;
        }

But I hope someone who's a better coder than I can come up with a better way of doing this. The way I see it, we can either:

1. Make it so node_save() does not strip the mark-up from Google (I think this is safest).
2. Make a smarter way of converting the line breaks back than those ugly str_replace repeats.

Moving to new issue queue.

Marking this as a feature request. The initial bug report has been dealt with. If someone wants to tidy this up, feel free. Otherwise it will stay how it is.

About to commit a fix for this today.