- Added "x new comments" feature.  Requires a SQL update.

- Tidied up some comment related code in node.module.

modules/blog.module

@@ -180,7 +180,7 @@ function blog_page_user($uid = 0, $date = 0) {
     }
 
     if ($blog->comment) {
-      $links[] = "<a href=\"node.php?id=$blog->nid\">". format_plural(node_get_comments($blog->nid), t("comment"), t("comments")) ."</a>";
+      $links[] = "<a href=\"node.php?id=$blog->nid\">". format_plural(comment_num_all($blog->nid), t("comment"), t("comments")) ."</a>";
     }
 
     $output .= "<tr><td><div style=\"margin-left: 20px;\"><b>". check_output($blog->title) ."</b></div></td><td align=\"right\">". $theme->links($links) ."</td></tr>";
@@ -217,7 +217,7 @@ function blog_page_last() {
     }
 
     if ($blog->comment) {
-      $links[] = "<a href=\"node.php?id=$blog->nid\">". format_plural(node_get_comments($blog->nid), t("comment"), t("comments")) ."</a>";
+      $links[] = "<a href=\"node.php?id=$blog->nid\">". format_plural(comment_num_all($blog->nid), t("comment"), t("comments")) ."</a>";
     }
 
     $output .= "<tr><td><b>". check_output($blog->title) ."</b></td><td align=\"right\">". $theme->links($links) ."</td></tr>";

modules/blog/blog.module

@@ -180,7 +180,7 @@ function blog_page_user($uid = 0, $date = 0) {
     }
 
     if ($blog->comment) {
-      $links[] = "<a href=\"node.php?id=$blog->nid\">". format_plural(node_get_comments($blog->nid), t("comment"), t("comments")) ."</a>";
+      $links[] = "<a href=\"node.php?id=$blog->nid\">". format_plural(comment_num_all($blog->nid), t("comment"), t("comments")) ."</a>";
     }
 
     $output .= "<tr><td><div style=\"margin-left: 20px;\"><b>". check_output($blog->title) ."</b></div></td><td align=\"right\">". $theme->links($links) ."</td></tr>";
@@ -217,7 +217,7 @@ function blog_page_last() {
     }
 
     if ($blog->comment) {
-      $links[] = "<a href=\"node.php?id=$blog->nid\">". format_plural(node_get_comments($blog->nid), t("comment"), t("comments")) ."</a>";
+      $links[] = "<a href=\"node.php?id=$blog->nid\">". format_plural(comment_num_all($blog->nid), t("comment"), t("comments")) ."</a>";
     }
 
     $output .= "<tr><td><b>". check_output($blog->title) ."</b></td><td align=\"right\">". $theme->links($links) ."</td></tr>";

modules/comment.module

@@ -12,6 +12,47 @@ function comment_settings($mode, $order, $threshold) {
   }
 }
 
+function comment_num_all($nid) {
+  $comment = db_fetch_object(db_query("SELECT COUNT(c.nid) AS number FROM node n LEFT JOIN comments c ON n.nid = c.nid WHERE n.nid = '$nid' GROUP BY n.nid"));
+  return $comment->number ? $comment->number : 0;
+}
+
+function comment_num_new($nid) {
+  global $user;
+
+  if ($user->uid) {
+
+    /*
+    ** Retrieve the timestamp at which the current user last viewed
+    ** the specified node and use this timestamp to find the number
+    ** of new comments.
+    */
+
+    $history = db_fetch_object(db_query("SELECT timestamp FROM history WHERE uid = '$user->uid' AND nid = '$nid'"));
+    $comment = db_fetch_object(db_query("SELECT COUNT(c.nid) AS number FROM node n LEFT JOIN comments c ON n.nid = c.nid WHERE n.nid = '$nid' AND timestamp > '". ($history->timestamp ? $history->timestamp : 0) ."' GROUP BY n.nid"));
+
+    return $comment->number ? $comment->number : 0;
+  }
+  else {
+    return 0;
+  }
+
+}
+
+function comment_tag_new($nid) {
+  global $user;
+
+  if ($user->uid) {
+    $result = db_query("SELECT timestamp FROM history WHERE uid = '$user->uid' AND nid = '$nid'");
+    if (db_fetch_object($result)) {
+      db_query("UPDATE history SET timestamp = '". time() ."' WHERE uid = '$user->uid' AND nid = '$nid'");
+    }
+    else {
+      db_query("INSERT INTO history (uid, nid, timestamp) VALUES ('$user->uid', '$nid', '". time() ."')");
+    }
+  }
+}
+
 function comment_access($op, $comment) {
   global $user;
 
@@ -460,6 +501,7 @@ function comment_perm() {
 }
 
 function comment_link($type, $node = 0, $main = 0) {
+
   if ($type == "admin" && user_access("administer comments")) {
     $links[] = "<a href=\"admin.php?mod=comment\">comments</a>";
   }
@@ -473,10 +515,19 @@ function comment_link($type, $node = 0, $main = 0) {
       */
 
       if (user_access("access comments")) {
-        $links[] = "<a href=\"node.php?id=$node->nid#comment\">". format_plural(node_get_comments($node->nid), "comment", "comments") ."</a>";
+        $all = comment_num_all($node->nid);
+        $new = comment_num_new($node->nid);
+
+        $links[] = "<a href=\"node.php?id=$node->nid#comment\">". format_plural($all, "comment", "comments") . ($new ? ", $new ". t("new") : "") ."</a>";
       }
     }
     else {
+      /*
+      ** Tag the node's comments as read:
+      */
+
+      comment_tag_new($node->nid);
+
       /*
       ** Node page: add a "post comment" link if the user is allowed to
       ** post comments.
@@ -493,7 +544,7 @@ function comment_link($type, $node = 0, $main = 0) {
 
 function comment_node_link($node) {
 
-  if (user_access("administer comments") && node_get_comments($node->nid)) {
+  if (user_access("administer comments") && comments_all($node->nid)) {
 
     /*
     ** Edit comments:

modules/comment/comment.module

@@ -12,6 +12,47 @@ function comment_settings($mode, $order, $threshold) {
   }
 }
 
+function comment_num_all($nid) {
+  $comment = db_fetch_object(db_query("SELECT COUNT(c.nid) AS number FROM node n LEFT JOIN comments c ON n.nid = c.nid WHERE n.nid = '$nid' GROUP BY n.nid"));
+  return $comment->number ? $comment->number : 0;
+}
+
+function comment_num_new($nid) {
+  global $user;
+
+  if ($user->uid) {
+
+    /*
+    ** Retrieve the timestamp at which the current user last viewed
+    ** the specified node and use this timestamp to find the number
+    ** of new comments.
+    */
+
+    $history = db_fetch_object(db_query("SELECT timestamp FROM history WHERE uid = '$user->uid' AND nid = '$nid'"));
+    $comment = db_fetch_object(db_query("SELECT COUNT(c.nid) AS number FROM node n LEFT JOIN comments c ON n.nid = c.nid WHERE n.nid = '$nid' AND timestamp > '". ($history->timestamp ? $history->timestamp : 0) ."' GROUP BY n.nid"));
+
+    return $comment->number ? $comment->number : 0;
+  }
+  else {
+    return 0;
+  }
+
+}
+
+function comment_tag_new($nid) {
+  global $user;
+
+  if ($user->uid) {
+    $result = db_query("SELECT timestamp FROM history WHERE uid = '$user->uid' AND nid = '$nid'");
+    if (db_fetch_object($result)) {
+      db_query("UPDATE history SET timestamp = '". time() ."' WHERE uid = '$user->uid' AND nid = '$nid'");
+    }
+    else {
+      db_query("INSERT INTO history (uid, nid, timestamp) VALUES ('$user->uid', '$nid', '". time() ."')");
+    }
+  }
+}
+
 function comment_access($op, $comment) {
   global $user;
 
@@ -460,6 +501,7 @@ function comment_perm() {
 }
 
 function comment_link($type, $node = 0, $main = 0) {
+
   if ($type == "admin" && user_access("administer comments")) {
     $links[] = "<a href=\"admin.php?mod=comment\">comments</a>";
   }
@@ -473,10 +515,19 @@ function comment_link($type, $node = 0, $main = 0) {
       */
 
       if (user_access("access comments")) {
-        $links[] = "<a href=\"node.php?id=$node->nid#comment\">". format_plural(node_get_comments($node->nid), "comment", "comments") ."</a>";
+        $all = comment_num_all($node->nid);
+        $new = comment_num_new($node->nid);
+
+        $links[] = "<a href=\"node.php?id=$node->nid#comment\">". format_plural($all, "comment", "comments") . ($new ? ", $new ". t("new") : "") ."</a>";
       }
     }
     else {
+      /*
+      ** Tag the node's comments as read:
+      */
+
+      comment_tag_new($node->nid);
+
       /*
       ** Node page: add a "post comment" link if the user is allowed to
       ** post comments.
@@ -493,7 +544,7 @@ function comment_link($type, $node = 0, $main = 0) {
 
 function comment_node_link($node) {
 
-  if (user_access("administer comments") && node_get_comments($node->nid)) {
+  if (user_access("administer comments") && comments_all($node->nid)) {
 
     /*
     ** Edit comments:

modules/node.module

@@ -14,15 +14,10 @@ function node_help() {
   }
 }
 
-// TODO: still used by themes, yet doesn't return anything at the moment
+// DEPRICATED: still used by themes, yet doesn't return anything at the moment
 function node_index() {
 }
 
-function node_get_comments($nid) {
-  $comment = db_fetch_object(db_query("SELECT COUNT(c.nid) AS number FROM node n LEFT JOIN comments c ON n.nid = c.nid WHERE n.nid = '$nid' GROUP BY n.nid"));
-  return $comment->number ? $comment->number : 0;
-}
-
 function node_teaser($body) {
 
   $size = 400;

modules/node/node.module

@@ -14,15 +14,10 @@ function node_help() {
   }
 }
 
-// TODO: still used by themes, yet doesn't return anything at the moment
+// DEPRICATED: still used by themes, yet doesn't return anything at the moment
 function node_index() {
 }
 
-function node_get_comments($nid) {
-  $comment = db_fetch_object(db_query("SELECT COUNT(c.nid) AS number FROM node n LEFT JOIN comments c ON n.nid = c.nid WHERE n.nid = '$nid' GROUP BY n.nid"));
-  return $comment->number ? $comment->number : 0;
-}
-
 function node_teaser($body) {
 
   $size = 400;

update.php

@@ -41,6 +41,7 @@
   "2001-12-16" => "update_14",
   "2001-12-24" => "update_15",
   "2001-12-30" => "update_16",
+  "2001-12-31" => "update_17",
 );
 
 // Update functions
@@ -296,6 +297,15 @@ function update_16() {
   update_sql("ALTER TABLE comments CHANGE lid nid int(10) NOT NULL;");
 }
 
+function update_17() {
+  update_sql("CREATE TABLE history (
+    uid int(10) DEFAULT '0' NOT NULL,
+    nid int(10) DEFAULT '0' NOT NULL,
+    timestamp int(11) DEFAULT '0' NOT NULL,
+    PRIMARY KEY (uid, nid)
+  );");
+}
+
 // System functions
 function update_sql($sql) {
   global $edit;