New exciting experimental feature: EXCLUDE queries.

append exclude:ID to your URL query string to exclude a category from the listing. e.g. ?x=cat:10;exclude:5 to list all the entries which belongs to cat-id 10 AND NOT to cat-id 5

fp-includes/core/core.fpdb.class.php

@@ -10,6 +10,7 @@
 		var $count	= -1;
 		var $random = 0;
 		var $category = 0;
+		var $exclude  = null;
 		var $page	= 1;
 		var $fullparse = false;
 		var $comments = false;
@@ -119,6 +120,10 @@
 				$this->comments = true;
 			}
 			
+			if (isset($params['exclude'])) {
+				$this->not = intval($params['exclude']);
+			}
+			
 		}
 		
 		function parse_string($str) {
@@ -142,6 +147,9 @@
 		var $nextid		= '';
 		var $previd		= '';
 		var $currentid	= '';		
+		var $main_idx = null;
+		var $secondary_idx = null;
+		var $walker = null;
 	
 		function FPDB_Query($params, $ID) {
 			
@@ -166,7 +174,8 @@
 			
 			$fpdb->init();
 			
-			$entry_index =& $fpdb->get_index($this->params->category);
+			$this->main_idx =& $fpdb->get_index($this->params->category);		
+			$entry_index =& $this->main_idx;
 
 			$this->counter++;
 
@@ -184,8 +193,17 @@
 				$this->_prepare_single($entry_index);
 			} else {
 				$this->_prepare_list($entry_index);
+				
+				if ($this->params->exclude) {
+					$o =& $fpdb->get_index($this->params->exclude);
+					if ($o !== false)
+						$this->secondary_idx =& $o;
+				}
 			}
 			
+			// force first entry to be loaded: updates count, pointer
+			$this->peekEntry();
+			
 			
 		
 		}
@@ -285,22 +303,6 @@
 					$index_count = $qp->start = $qp->count = 0;
 			}
 			
-			#$this->pointer = $qp->start;
-
-			// fills array
-			
-	
-			
-			/*
-				stuff for cats, have a look
-
-			$this->local_list =& $tmp;
-			
-			if ($qp->start + $qp->count > $i) {
-				$qp->count = $i - $qp->start;
-			}
-			 */
-			
 		}
 
 		// not so great implementation... doesn't work well
@@ -328,24 +330,28 @@
 		
 		function hasMore() {
 			
-			
 			$GLOBALS['current_query'] =& $this;
 			
-			
+			// if system init has not been done (filling pointer variable etc.)
-			if ($this->counter < 0)
+			// call prepare()
+			if ($this->counter < 0) {
 				$this->prepare();
+			}
 			
-			return $this->pointer < $this->params->start + $this->params->count;
+			// hasMore() returns false either if pointer exceeded the count
+			// or peekEntry returns false
+			return ((bool) $this->peekEntry()
+				&&	$this->pointer < $this->params->start + $this->params->count );
 		}
 		
 		function &peekEntry() {
 		
 			global $post;
 
-			if (!$this->hasMore()) {
+			/*if (!$this->hasMore()) {
 				$false = array(false, false);
 				return $false;
-			}
+			}*/
 			
 			$qp =& $this->params;
 			
@@ -353,24 +359,46 @@
 			if ($this->counter < 0)
 				$this->prepare();
 
+			if (!$this->walker) {
+				$false = array(false, false);
+				return $false;
+			}
 		
-			#$this->_fillPrevId();
-			#$this->_fillNextId();
-						
-			#$id = $this->_fillCurrentId();
 			
+			// search first eligible post
 			while ($this->walker->valid && $this->pointer<$qp->start) {
 				
-				$this->previd = $this->currentid;
-				$id = $this->currentid = entry_keytoid($this->walker->current_key());
 
-				if ($this->single) $this->preventry = array('subject' => $this->walker->current_value());
+				$this->previd = $this->currentid;
+				$key = $this->walker->current_key();
+				$id = $this->currentid = entry_keytoid($key);
+
+				if ($this->single) 
+					$this->preventry = array('subject' => $this->walker->current_value());
 
 
 				$this->walker->next();
 				$this->pointer++;
 			}
 			
+			// if there is a secondary (not) idx
+			if ($this->secondary_idx) {
+				
+				// skips posts until we find one which is not in the secondary idx
+				while (  $this->walker->valid 
+				         && ($key = $this->walker->current_key())
+					&& $this->secondary_idx->has_key($key)) {
+					$this->walker->next();
+					$qp->count--;
+				
+				}
+			}
+			
+			if (!$this->walker->valid) {
+				$cont = false; return $cont; 
+			}
+ 				
+			
 			// pointer == start
 			
 			$prevcurr = $this->currentid;
@@ -639,6 +667,8 @@
 		 * m		(string) two digit month (06 means June); 'y' must be set
 		 * d		(string) two digit for day; 'y' and 'm' must be set
 		 *
+		 * exclude	(int) experimental: excludes category ID given as argument from listing
+		 *
 		 *
 		 * fullparse	(bool) non-full-parsed entries get their values 
 		 *				right from the indexed list (or <em>cache</em>).