Auto tag content with user's user tag or the group's tag

I made this patch to auto tag users content based upon their user tag. I used a location tag to tag each user. then all new content is defaulted to their location tag. if the user posts into a organic group the content is tagged with the group's location.

##Instructions
Create a single select taxonomy
Edit the following code with the taxonomy $vid (in my case the $vid was 1)
select that taxonomy to be used for user tags

!!The following code goes into taxonomy.module

This code needs more work. It is working for me at the moment so I am posting it in case anyone would like to implement something similar.

function taxonomy_form_alter($form_id, &$form) {
//.
//.
//.
//+++++Taxonomy.module around line 713+++++++++++
 else {
        // Extract terms belonging to the vocabulary in question.
        $default_terms = array();
        foreach ($terms as $term) {
          if ($term->vid == $vocabulary->vid) {
            $default_terms[$term->tid] = $term;
          }
        }

		
/*+++++++++++ADD(replace) starts from here++++++++++++++++++*/
//This sets the default vocab term based on node id . I.E. "37" or "38"
		//TODO : Must change $_Location_vid  to match the location taxonomy!!
		if (!(arg(2) == 'edit')){
			$_Location_vid = 1;
			
			//This is for setting the default vocabulary term based on termid passed by the URL
			/*if ($_GET['default_id'] != "") {
				$default_terms[$_GET['default_id']] = $_GET['default_id'];  
			}
			*/
			//we want it to grab the ID of the parent group and set it to default
			if ($_GET['gids'] != "") {
				// NOTE : Only works to default to a single taxonomy term (Probally the lightest term)
				$groups_node_id = $_GET['gids'][0];
				$location_keys = array_keys(taxonomy_node_get_terms_by_vocabulary($groups_node_id, $_Location_vid, $key = 'tid'));
				$default_terms[$location_keys[0]] = $location_keys[0];
				//maybe someday we will need to assign multiple default terms
				/*foreach ($location_keys as $lv_key){
					$default_terms[$lv_key] = $lv_key;
				}
				*/			
			} else {
				//the post is not part of a group, lets check the users location and default the post to the users location
				//requires the user tags module
				global $user;
				$location_tag = user_tags_get_terms_by_vocabulary($user->uid, $_Location_vid, $key = 'tid');
				$location_keys = array_keys($location_tag);
				$default_terms[$location_keys[0]] = $location_keys[0];
			}
		}
/*+++++++++++++ADD(replace) ends here++++++++++++++++*//End hack
		
		
		
		$form['taxonomy'][$vocabulary->vid] = taxonomy_form($vocabulary->vid, array_keys($default_terms), $vocabulary->help);
        $form['taxonomy'][$vocabulary->vid]['#weight'] = $vocabulary->weight;
        $form['taxonomy'][$vocabulary->vid]['#required'] = $vocabulary->required;
      }