Port Zen to D6

Well, it proved much more of a challenge than I thought it would be. Creating a new .info file was the easiest part. There were several more roadblocks to be removed before Zen worked on Drupal 6 which took many more hours than I was expecting.

As far as I can tell, the Zen theme is working 100%, (but the Zen-fixed theme is having some trouble with sidebars. As soon as this is solved I will upload the fix.)

Here are the problems encountered

1. The function _phptemplate_variables is no longer supported in D6. Instead we must use phptemplate_preprocess_page, phptemplate_preprocess_node & phptemplate_preprocess_comment. I have made the changes which required a re-organization of template.php (attached). Some lines of the old _phptemplate_variables had to be repeated in each of the new functions.
2. The old sidebar_left and sidebar_right variables have to be globally replaced with left and right. This hits page.tpl.php as well.
3. This is not formally documented, as far as I can see, but Drupal 6 uses error_reporting = E_ALL which throws up several errors in template.php. They have to be resolved by putting an isset() around the variable, rather than the old way of testing if it is true or false.

I have uploaded the complete files which have to be renamed, since the system won't allow php or info files to be attached.

For future reference, the changes for D6 themes are documented here: http://drupal.org/node/132442 , http://drupal.org/node/114774 and http://drupal.org/node/165706

I have got Zen-fixed working. The problem seems to be that it needs a copy of page.tpl.php copied into the zen-fixed folder. I'm sure there must be a better way to do this, but at least it works for now.

I have also done some tidying up to zen-fixed.info and the template.php within zen-fixed. When I figure out how to do it, I will create patch files for the ones I have changed.