forum.module 27.5 KB
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<?php
// $Id$

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function forum_system($field){
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  $system["description"] = t("Enable threaded discussions about general topics.");
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  return $system[$field];
}

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function forum_node($field) {
  $info["name"] = t("discussion forum");
  $info["description"] = t("A forum is a threaded discussion, enabling users to communicate about a particular topic.");

  return $info[$field];
}

function forum_access($op, $node) {
  if ($op == "view") {
    return $node->status;
  }
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  if ($op == "create") {
    return user_access("post content");
  }
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}

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function forum_perm() {
  return array("post forum topics without approval");
}
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function forum_conf_options() {
  foreach (taxonomy_get_vocabularies("forum") as $vid => $voc) {
    $vocs[$vid] = $voc->name;
  }
  $output .= "<a name=\"image_nav_vocabulary\"></a>";
  $output .= form_select("Forum vocabulary", "forum_nav_vocabulary", variable_get("forum_nav_vocabulary", ""), $vocs, t("The taxonomy vocabulary that will be uses as the navigation tree."));
  $output .= _taxonomy_term_select("Containers", "forum_containers", variable_get("forum_containers", array()), variable_get("forum_nav_vocabulary", ""), t("You can choose vocabularies which will not have topics, but will be just containers for other forums."), 1, t("<none>"));

  $output .= form_textfield("Topic icons path", "forum_topic_icon_path", variable_get("forum_topic_icon_path", "images/forum/topics/"), 30, 255, "The path to the topic icons.  Leave blank to disable icons.");
  $output .= form_textfield("Folder icons path", "forum_folder_icon_path", variable_get("forum_folder_icon_path", "images/forum/folder/"), 30, 255, "Path to the <i>default</i>, <i>hot</i>, <i>new</i> and <i>closed folder</i> icons.  Leave blank to disable icons.");
  $number = array(5 => 5, 10 => 10, 15 => 15, 20 => 20, 25 => 25, 30 => 30, 35 => 35, 40 => 40, 50 => 50, 60 => 60, 80 => 80, 100 => 100, 10000=>10000);
  $output .= form_select("Hot topic threshold", "forum_hot_topic", variable_get("forum_hot_topic", 15), $number, "The number of posts a topic must have to be considered <i>hot</i>.");
  $number = array(10 => 10, 25 => 25, 50 => 50, 75 => 75, 100 => 100);
  $output .= form_select("Topics per page", "forum_per_page", variable_get("forum_per_page", 25), $number, "The default number of topics displayed per page; links to browse older messages are automatically being displayed.");
  $forder = array(1 => "Date - newest first", 2 => "Date - oldest first", 3 => "Posts - most active first", 4=> "Posts - least active first");
  $output .= form_select("Default order", "forum_order", variable_get("forum_order", 1), $forder, "The default display order for topics.");
  $output .= form_textfield("Number of topics in block", "forum_block_num", variable_get("forum_block_num", "5"), 5, 5, "The number of topics in the <i>active topics</i> block.");
  $output .= form_select("Internal caching", "forum_cache", variable_get("forum_cache", 0), array("disabled", "enabled"), "Cache internal datastructures for both anonymous and autheticated users.  When enabled, the forum data won't be 100% up to date with regards regardto the number of posts, the number of replies and the last topic being posted.  Enable when you have busy forum.");

  return $output;
}

function forum_save($op, $node) {
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  if ($op == "approve") {
    return array("status" => 1);
  }

  if ($op == "create") {
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    if (user_access("post forum topics without approval")) {
      $moderation = array("body" => filter($node->body), "moderate" => 0, "status" => 1);
    } else {
      $moderation = array("body" => filter($node->body), "moderate" => 1, "status" => 0);
    }
    return array_merge($moderation, array("tid", "icon_num", "shadow"));
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  }

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  if ($op == "decline") {
    return array("status" => 0);
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  }

  if ($op == "update") {
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    // if she changed the term, we could have to leave a shadow
    $old_terms = explode(",", $node->old_container);
    foreach ($node->taxonomy as $term) {
      if ($term && (!in_array($term, $old_terms)) && $node->shadow) {
        $shadow = $term;
        break;
      }
    }
    return array("body" => filter($node->body), "tid", "icon_num", "shadow" => $shadow, "old_container");
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  }
}

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function forum_load($node) {
  $forum = db_fetch_object(db_query("SELECT * FROM forum WHERE nid = '%d' AND shadow = 0", $node->nid));

  return $forum;
}

function forum_block() {
  if (user_access("access content")) {
    $result = db_query("SELECT n.nid, n.title, n.body, GREATEST(n.created, MAX(c.timestamp)) AS sort FROM node n, forum f LEFT JOIN comments c ON c.nid = n.nid WHERE n.type = 'forum' AND n.nid = f.nid AND f.shadow = 0 AND n.status = 1 GROUP BY n.nid ORDER BY sort DESC LIMIT ". variable_get("forum_block_num", "5"));
    while ($node = db_fetch_object($result)) {
      $content .= "<li>".l(check_output($node->title), array("id" => $node->nid), "node", "", array("title" => substr(strip_tags($node->body), 0, 100)."..."))."</li>\n";
    }

    if ($content) {
      $content .= "<p><div align=\"center\">".lm(t("browse forums"), array("mod" => "forum"))."</div></p>";
    }
  }
  $blocks[0][subject] = t("Forum active topics");
  $blocks[0][content] = $content;
  $blocks[0][info] = t("Forum active topics");

  return $blocks;
}

function forum_link($type, $node) {
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  if ($type == "page" && user_access("access content")) {
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    $links[] = lm(t("forum"), array("mod" => "forum"));
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  }

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  if ($type == "menu.create" && user_access("post content")) {
    // I had complains that having this link leads people not to choose a forum, and always post in the first forum.
    #$links[] = lm(t("create forum topic"), array("mod" => "node", "op" => "add", "type" => "forum"), "", array("title" => t("Start a new forum topic.")));
  }

  if ($type == "node" && $node->type == "forum") {
    // get previous and next topic

    $sql = "SELECT n.nid, title, body, GREATEST(n.created, MAX(c.timestamp)) AS date_sort, COUNT(c.nid) AS num_comments FROM node n, term_node t, forum f LEFT JOIN comments c ON c.nid = n.nid WHERE n.nid = t.nid AND n.nid = f.nid AND t.tid = '%d' AND f.shadow = 0 AND n.status = 1 GROUP BY n.nid ORDER BY ". _forum_get_topic_order(isset($user->sortby) ? $user->sortby : variable_get("forum_order",1));

    $terms = array_keys(taxonomy_node_get_terms_by_vocabulary($node->nid, variable_get("forum_nav_vocabulary", "")));
    $result = db_query($sql, $terms[0]);

    while ($topic = db_fetch_object($result)) {
      if ($stop == 1) {
        $next->nid = $topic->nid;
        $next->title = $topic->title;
        $next->body = $topic->body;
        break;
      }
      if ($topic->nid == $node->nid) {
        $stop = 1;
      }
      else {
        $prev->nid = $topic->nid;
        $prev->title = $topic->title;
        $prev->body = $topic->body;
      }
    }

    if ($prev) {
      $links[] = l(t("previous topic"), array("id" => $prev->nid), "node", "", array("title" => $prev->title."\n".substr(strip_tags($prev->body), 0, 100)."..."));
    }

    if ($next) {
      $links[] = l(t("next topic"), array("id" => $next->nid), "node", "", array("title" => $next->title."\n".substr(strip_tags($next->body), 0, 100)."..."));
    }
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  }

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  return $links ? $links : array();
}

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function forum_view($node, $main = 0) {
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  global $theme;
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  $term_data = array_shift(taxonomy_node_get_terms($node->nid));
  if (!$term_data) {
    // we are previewing
    $term_data = taxonomy_get_term($node->taxonomy[0]);
  }
  $voc = taxonomy_get_vocabulary($term_data->vid);

  $output .= "<p>"._forum_get_icon($node)." ".lm(check_output($voc->name), array("mod" => "forum"))." : ".lm(check_output($term_data->name), array("mod" => "forum", "tid" => $term_data->tid));

  $output .= " / <b>". check_output($node->title) ."</b><br>".t("%a by %b", array("%a" => format_date($node->created), "%b" => format_name($node)))."</p><p>". check_output($node->body, 1) ."</p>";
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  $output .= "<p>". $theme->links(link_node($node, $main)) ."</p>";

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  #$theme->box(t("Discussion forum"), $output);

  $node->title = _forum_get_icon($node)." ".lm(check_output($voc->name), array("mod" => "forum"))." : ".lm(check_output($term_data->name), array("mod" => "forum", "tid" => $term_data->tid)) . " / <b>". check_output($node->title) ."</b>";

  $theme->node($node, $main);
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}

function forum_form(&$node, &$help, &$error) {
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  global $tid;
  if ($node->nid) {
    if ($node->taxonomy) {
      $tid = $node->taxonomy;
    } else {
      // editing: load category from taxonomy
      $tid = implode(",", array_keys(taxonomy_node_get_terms($node->nid)));
    }
    //$output .= implode("<p>", taxonomy_node_form("forum", $node));
    $output .= "<input type=\"hidden\" name=\"edit[old_container]\" value=\"".implode(",", array_keys(taxonomy_node_get_terms($node->nid)))."\">";
    $output .= form_checkbox(t("Leave shadow?"), "shadow", 1, 1, t("If you move this topic, you can leave a link in the old forum to the new forum."));
  } else {
    if ($node->taxonomy) {
      $tid = $node->taxonomy;
    }
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  }

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  $output .= _taxonomy_term_select("Forum", "taxonomy", $tid, variable_get("forum_nav_vocabulary", ""), "", 0, "", variable_get("forum_containers", array()));

  if ($icon_path = variable_get("forum_topic_icon_path", "images/forum/topics/")) {
    if ($node->icon) {
      // we are editing post
      if ($dir = @opendir($icon_path)) {
        $icon_num = 0;
        while($icon = readdir($dir)) {
          if ($icon == '.' || $icon == '..') {continue;}
          if ($node->icon == $icon) {$checked = "checked";} else {$checked = "";}
          $radio .= "<input type=\"radio\" name=\"edit[icon_num]\" value=\"$icon_num\" $checked><img src=\"$icon_path$icon\"> \n";
          $icon_num++;
        }
        closedir($dir);
      }
    }
    else {
      if ($dir = @opendir($icon_path)) {
        $icon_num = 0;
        while($icon = readdir($dir)) {
          if ($icon == '.' || $icon == '..') {continue;}
          if ($node->icon_num == $icon_num) {$checked = "checked";} else {$checked = "";}
          $radio .= "<input type=\"radio\" name=\"edit[icon_num]\" value=\"$icon_num\" $checked><img src=\"$icon_path$icon\"> \n";
          $icon_num++;
        }
        closedir($dir);
      }
    }
    $output .= form_item(t("Topic icon"), $radio);
  }
  $output .= form_textarea("Body", "body", $node->body, 60, 10);
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  return $output;
}

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function forum_insert($node) {
  $node->icon = _forum_decode_icon($node);
  if (!$node->shadow) {
    db_query("INSERT INTO forum (nid, icon) VALUES ('%d', '%s')", $node->nid, $node->icon);
  } else {
    // we created a shadow, a link to a moved topic in a new forum
    db_query("INSERT INTO forum (nid, icon, shadow) VALUES ('%d', '%s', '%d')", $node->nid, $node->icon, $node->shadow);
  }

  if (variable_get("forum_cache", 0)) {
    cache_clear();
  }
}

function forum_update($node) {
  $node->icon = _forum_decode_icon($node);
  db_query("UPDATE forum SET icon = '%s' WHERE nid = '%d'", $node->icon, $node->nid);
  if ($node->shadow) {
    // insert in old forum a new topic, with link to new forum
    $node->nid = "";
    $node->type = "forum";
    $node->status = 1;
    $node->taxonomy = array($node->old_container);
    node_submit($node);
  }
}

function _forum_decode_icon($node) {
  // to prevent malicious users
  if ($icon_path = variable_get("forum_topic_icon_path", "images/forum/topics/")) {
    if ($dir = @opendir($icon_path)) {
      $icon_num = 0;
      while($icon = readdir($dir)) {
        if ($icon == '.' || $icon == '..') {continue;}
        if ($icon_num == $node->icon_num) {$myicon = $icon;}
        $icon_num++;
      }
      closedir($dir);
    }
  }
  return $myicon;
}

function forum_delete(&$node) {
  db_query("DELETE FROM forum WHERE nid = '%d'", $node->nid);
}
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function _forum_num_comments($nid) {
  $value = db_fetch_object(db_query("SELECT COUNT(cid) AS count FROM comments WHERE nid = '%d' AND status = 0", $nid));
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  return ($value) ? $value->count : 0;
}

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function _forum_last_comment($nid) {
  $value = db_fetch_object(db_query("SELECT timestamp FROM comments WHERE nid = '%d' AND status = 0 ORDER BY timestamp DESC LIMIT 1", $nid));
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  return ($value) ? format_date($value->timestamp, "small") : "&nbsp;";
}

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function _forum_last_reply($nid) {
  $value = db_fetch_object(db_query("SELECT c.timestamp, u.name, u.uid FROM comments c LEFT JOIN users u ON c.uid = u.uid WHERE c.nid = '%d' AND c.status = 0 ORDER BY c.timestamp DESC LIMIT 1", $nid));
  return $value;
}

function _forum_format($topic) {
  if ($topic) {
    return format_date($topic->timestamp, "small")."<br>".t("by")." ". format_name($topic);
  }
  else {
    return message_na();
  }
}

function forum_get_forums($tid = 0) {
  global $user;

  if (!$tid) {
    $tid = 0;
  }

  if (variable_get("forum_cache", 0)) {
    $forums = unserialize(cache_get("forum:$tid"));
  }

  if (!$forums) {
    taxonomy_get_tree(variable_get("forum_nav_vocabulary", ""), $_forums, $tid);
    $n = 0;
    foreach ($_forums as $forum) {
      if (in_array($forum->tid, variable_get("forum_containers", array()))) {
        $forum->container = 1;
      }
      else {
        $forum->num_topics = _forum_num_topics($forum->tid);
        $forum->num_posts = _forum_num_replies($forum->tid) + $forum->num_topics;
        $forum->last_post = _forum_last_post($forum->tid);
      }
      $forums[$forum->tid] = $forum;
      $n++;
    }

    if (variable_get("forum_cache", 0)) {
      cache_set("forum:$tid", serialize($forums), time()+60*10);
    }
  }

  if ($user->uid && $forums) {
    foreach (_forum_topics_read($user->uid) as $tid => $old) {
      if ($forums[$tid]) {
        $forums[$tid]->old_topics = $old;
      }
    }
  }

  return $forums;
}

function forum_get_parents($tid) {
  if ($tid) {
    $parents[] = taxonomy_get_term($tid);
  }
  $n = 0;
  while ($parent = taxonomy_get_parents($parents[$n]->tid)) {
    $parents = array_merge($parents, $parent);
    $n++;
  }
  return $parents;
}

function _forum_num_topics($term) {
  $value = db_fetch_object(db_query("SELECT COUNT(n.nid) AS count FROM node n, term_node r, forum f WHERE r.tid = '%d' AND n.nid = r.nid AND n.nid = f.nid AND n.status = 1 AND n.type = 'forum' AND f.shadow = 0", $term));
  return ($value) ? $value->count : 0;
}

function _forum_num_replies($term) {
  $value = db_fetch_object(db_query("SELECT COUNT(*) AS count FROM comments c, term_node r, node n WHERE r.tid = '%d' AND n.nid = r.nid AND n.nid = c.nid AND n.status = 1 AND c.status = 0 AND n.type = 'forum'", $term));
  return ($value) ? $value->count : 0;
}

function _forum_topics_read($uid) {
  $result = db_query("SELECT tid, count(*) AS c FROM history h, term_node r, node n WHERE r.nid = h.nid AND n.nid = h.nid AND n.type = 'forum' AND n.status = 1 AND h.uid = '%d' GROUP BY tid", $uid);

  while ($obj = db_fetch_object($result)) {
    $topics_read[$obj->tid] = $obj->c;
  }

  return $topics_read ? $topics_read : array();
}

function _forum_last_post($term) {
  $topic = db_fetch_object(db_query("SELECT n.nid, n.created AS timestamp, u.name AS name, u.uid AS uid FROM node n, term_node r LEFT JOIN users u ON n.uid = u.uid WHERE r.tid = '%d' AND n.nid = r.nid AND n.type = 'forum' AND n.status = 1 ORDER BY timestamp DESC LIMIT 1", $term));

  $reply = db_fetch_object(db_query("SELECT n.nid, c.timestamp, u.name AS name, u.uid AS uid FROM term_node r, node n LEFT JOIN comments c ON n.nid=c.nid LEFT JOIN users u ON c.uid = u.uid WHERE r.tid = '%d' AND n.nid = r.nid AND n.type = 'forum' AND n.status = 1 AND c.status = 0 ORDER BY c.timestamp DESC LIMIT 1", $term));

  $value = ($topic->timestamp > $reply->timestamp) ? $topic : $reply;

  return $value;
}

function forum_get_topics($tid, $sortby, $forum_per_page, $offset) {
  global $user;

  $term = taxonomy_get_term($tid);
  $voc = taxonomy_get_vocabulary($term->vid);

  $sql_sortby = _forum_get_topic_order($sortby);

  $sql = "
    SELECT n.nid, title, users.name AS name, users.uid AS uid, n.created AS timestamp, GREATEST(n.created, MAX(c.timestamp)) AS date_sort, COUNT(c.nid) AS num_comments, icon, n.comment AS comment_mode, shadow FROM node n, term_node r LEFT JOIN users ON n.uid = users.uid LEFT JOIN comments c ON c.nid = n.nid LEFT JOIN forum f ON n.nid = f.nid WHERE n.nid = r.nid AND r.tid = '%d' AND n.status = 1 AND n.type = 'forum' GROUP BY n.nid ORDER BY $sql_sortby";

  $result = db_query($sql, $tid);
  $topic_num = db_num_rows($result);

  $n = 0;
  while ($topic = db_fetch_object($result)) {
    if ($n < $offset) {
      $n++;
      continue;
    }

    $history = _forum_user_last_visit($topic->nid);
    // folder is new if topic is new or there are new comments since last visit
    if ($topic->shadow > 0) {
      $topic->new = 0;
    }
    else {
      if (!$history && $user->uid) {
        $topic->new_replies = 0;
        $topic->new = 1;
      }
      else {
        $comments = db_result(db_query("SELECT COUNT(c.nid) FROM node n LEFT JOIN comments c ON n.nid = c.nid WHERE n.nid = '$topic->nid' AND c.status = 0 AND timestamp > '$history' GROUP BY n.nid"));

        $topic->new_replies = $comments ? $comments : 0;
        if ($topic->new_replies) {
          $topic->new = 1;
        }
        else {
          $topic->new = 0;
        }
      }
    }

    $topic->last_reply = _forum_last_reply($topic->nid);
    $topics[] = $topic;

    $n++;
    if ($n == ($forum_per_page + $offset)) {
      break;
    }
  }

  return array($topics, $topic_num);
}

function _forum_first_new($tid) {
  global $user;
  $result = db_query("SELECT r.nid FROM node n, history h, term_node r WHERE n.type = 'forum' AND n.status = 1 AND h.nid = n.nid AND r.nid = h.nid AND r.tid = '%d' AND h.uid = '%d'   ", $tid, $user->uid);
  while ($r = db_fetch_object($result)) {
    $read[] = $r->nid;
  }

  if ($read) {
    $nid = db_result(db_query("SELECT r.nid AS c FROM node n LEFT JOIN term_node r ON r.nid = n.nid WHERE n.type = 'forum' AND n.status = 1 AND r.tid = '%d' AND NOT (r.nid IN (".implode(",", $read).")) ORDER BY created LIMIT 1", $tid));
  }

  return $nid ? $nid : 0;
}

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function forum_page() {
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  global $theme, $tid, $sortby, $forum_per_page, $offset, $op, $user;
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  if (user_access("access content")) {
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    if ($op == "Update settings") {
      $user = user_save($user, array("sortby" => $sortby, "forum_per_page" => $forum_per_page));
    }
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    if ($op == "first_new") {
      if ($nid = _forum_first_new($tid)) {
        drupal_goto(drupal_url(array("id" => $nid), "node"));
      }
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    }

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    if (empty($sortby)) {
      $sortby = isset($user->sortby) ? $user->sortby : variable_get("forum_order",1);
    }
    if (empty($forum_per_page)) {
      $forum_per_page = isset($user->forum_per_page) ? $user->forum_per_page : variable_get("forum_per_page", 25);
    }
    if (empty($offset)) {
      $offset = 0;
    }

    $forums = forum_get_forums($tid);
    $parents = forum_get_parents($tid);
    if ($tid && !in_array($tid, variable_get("forum_containers", array()))) {
      list($topics, $topic_num) = forum_get_topics($tid, $sortby, $forum_per_page, $offset);
    }

    _forum_theme_invoke("forum_render", $forums, $topics, $topic_num, $parents, $tid, $sortby, $forum_per_page, $offset);
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  }
  else {
    $theme->header();
    $theme->box(t("Access denied"), message_access());
    $theme->footer();
  }
}

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/**
*** render functions
**/

function forum_render($forums, $topics, $topic_num, $parents, $tid, $sortby, $forum_per_page, $offset) {
  // forum list, topics list, topic browser and "add new topic" link
  global $theme;

  $output .= _forum_theme_invoke("forum_forum_list", $forums, $parents, $tid);
  if ($tid && !in_array($tid, variable_get("forum_containers", array()))) {
    $output .= _forum_theme_invoke("forum_topic_list", $topics, $topic_num, $sortby, $forum_per_page, $offset);
  }

  $theme->header();
  $theme->box(t("Discussion forum"), $output);
  if ($tid && !in_array($tid, variable_get("forum_containers", array()))) {
    $theme->box(t("Control panel"), _forum_theme_invoke("forum_topic_browser", $sortby, $forum_per_page, $offset));
  }
  $theme->footer();
}

function forum_forum_list($forums, $parents, $tid) {
  global $user;
  if ($parents) {
    foreach($parents as $p) {
      if ($tid != $p->tid) {
        $t[] = lm($p->name, array("mod" => "forum", "tid" => $p->tid));
      }
      else {
        $t[] = $p->name;
      }
    }
  }
  $t[] = lm(t("forum"), array("mod" => "forum"));

  $output .= "<table border=\"0\" width=\"100%\">\n";
  $output .= " <tr><th colspan=\"3\" align=\"left\">".implode(" : ", array_reverse($t)) ."</th>";
  if ($forums) {
    $output .= "<th>". t("topics") ."</th><th>". t("posts") ."</th><th>". t("last post") ."</th></tr>";


    foreach ($forums as $forum) {
      if ($forum->container) {
        $output .= " <tr><td colspan=\"5\">".lm(check_output($forum->name), array("mod" => "forum", "tid" => $forum->tid))."<br><small>". ($forum->description ? check_output($forum->description, 1) : "") ."</small></td></tr>";
      } else {
        if ($user->uid) $new_topics = $forum->num_topics - $forum->old_topics;
        $icon = _forum_get_folder_icon($new_topics);
        $output .= " <tr><td>&nbsp;</td><td>$icon</td>";
        $output .= "<td><table><tr><td width=\"".($forum->depth*20)."\">&nbsp;</td><td>".lm(check_output($forum->name), array("mod" => "forum", "tid" => $forum->tid))."<br><small>". check_output($forum->description, 1);

        $links = array();
        if ($forum->last_post) {
          $links[] = l(t("last topic"), array("nid" => $forum->last_post->nid));
        }
        if ($new_topics) {
          $links[] = lm(t("first new topic"), array("mod" => "forum", "op" => "first_new", "tid" => $forum->tid));
        }

        if ($links) {
          $output .= "<br>(".implode(", ", $links).")";
        }

        $output .= "</small></td></tr></table></td>";
        $output .= "<td align=\"center\">".$forum->num_topics.($new_topics ? "<br>(".t("%a new", array("%a" => $new_topics)).")" : "")."</td><td align=\"center\">".$forum->num_posts."</td><td align=\"center\">"._forum_format($forum->last_post)."</td></tr>";
      }
    }
  }
  $output .= "</table>\n";

  return $output;
}

function forum_topic_browser() {
  global $tid, $sortby, $forum_per_page, $offset;

  if (empty($sortby)) {
    $sortby = variable_get("forum_order",1);
  }
  if (empty($forum_per_page)) {
    $forum_per_page = variable_get("forum_per_page", 25);
  }

  $forum_per_page_options = array(10, 25, 50, 75, 100);
  foreach ($forum_per_page_options as $value) {
    $options .= " <option value=\"$value\"". ($forum_per_page == $value ? " selected=\"selected\"" : "") .">".t("%a topics per page", array("%a" => $value))."</option>\n";
  }

  $output .= "<select name=\"forum_per_page\">$options</select>\n";

  $options = "";
  $sortby_options = array(1 => t("Date - newest first"), 2 => t("Date - oldest first"), 3 => t("Posts - most active first"), 4=> t("Posts - least active first"));
  foreach ($sortby_options as $key => $value) {
    $options .= " <option value=\"$key\"". ($sortby == $key ? " selected=\"selected\"" : "") .">$value</option>\n";
  }

  $output .= "\n<select name=\"sortby\">$options</select>\n";
  $output .= form_hidden("tid", $tid);
  $output .= form_submit(t("Update settings"));
  return form(form_item(t("Topic viewing options"), $output, t("Select your preferred way to display the topics and click 'Update settings'.")));
}

function forum_topic_list($topics, $num_topics, $sortby, $forum_per_page, $offset) {
  global $theme, $id, $status, $tid, $user;

  $output .= "<div align=\"center\"><small>(".t("%a topics, %b topics per page, page %c of %d", array("%a" => $num_topics, "%b" => $forum_per_page, "%c" => ceil(($offset + 1)/$forum_per_page), "%d" => ceil($num_topics/$forum_per_page))).")</small></div>";

  if ($topics) {
    $output .= "<table border=\"0\" width=\"100%\">\n";
    $output .= " <tr><th>&nbsp;</th><th>&nbsp;</th><th>". t("topic") ."</th><th>". t("replies") ."</th><th>". t("posted") ."</th><th>". t("last reply") ."</th></tr>";

    foreach ($topics as $topic) {
      // folder is new if topic is new or there are new comments since last visit
      if ($topic->shadow) {
        $output .= "
          <tr>
            <td>"._forum_get_folder_icon($topic->new, $topic->num_comments, $topic->comment_mode)."</td>
            <td>"._forum_get_icon($topic)."</td>
            <td>". check_output($topic->title) ."</td>
            <td align=\"center\" colspan=\"3\">".lm(t("This topic has been moved"), array("mod" => "forum", "tid" => $topic->shadow))."</td>
          </tr>";
      }
      else {
        $output .= "
          <tr>
            <td>"._forum_get_folder_icon($topic->new, $topic->num_comments, $topic->comment_mode)."</td>
            <td>"._forum_get_icon($topic)."</td>
            <td>".l(check_output($topic->title), array("id" => $topic->nid))."</td>
            <td align=\"center\">".$topic->num_comments.($topic->new_replies ? " (".t("%a new", array("%a" => $topic->new_replies)).")" : "")."</td>
            <td align=\"center\">"._forum_format($topic)."</td>
            <td align=\"center\">"._forum_format($topic->last_reply)."</td>
          </tr>";
      }
    }

    $output .= "</table></blockquote>\n";
  }

  $output .= "<table width=\"100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\"><tr>";

  if ($offset > 0) {
    $output .= "<td width=\"33%\"><div align=\"left\"><h4>".lm(t("Previous topics"), array("mod" => "forum", "tid" => $tid, "offset" => ($offset-$forum_per_page)))."</h4></div></td>";
  }
  else {
    $output .= "<td width=\"33%\">&nbsp;</td>";
  }

  $output .= "<td width=\"33%\"><div align=\"center\"><h4>".lm(t("Start new topic"), array("mod" => "node", "op" => "add", "type" => "forum", "tid" => $tid))."</h4></div></td>";

  if (count($topics) >= $forum_per_page) {
    $output .= "<td width=\"33%\"><div align=\"right\"><h4>".lm(t("Next topics"), array("mod" => "forum", "tid" => $tid, "offset" => ($offset+$forum_per_page)))."</h4></div></td>";
  }
  else {
    $output .= "<td width=\"33%\">&nbsp;</td>";
  }

  $output .= "</tr></table>";

  return $output;
}


function _forum_get_icon($node) {
  if (variable_get("forum_topic_icon_path", "images/topics/") && $node->icon) {
    return "<img src=\"".variable_get("forum_topic_icon_path", "images/forum/topics/"). check_output($node->icon)."\">";
  }
  else {
    return "&nbsp;";
  }
}

function _forum_get_folder_icon($new_posts, $num_posts = 0, $comment_mode = 0) {
  // "folder" icon because it's generally rendered as a folder
  global $theme;

  $base_path = variable_get("forum_folder_icon_path", "images/forum/folder");
  if ($base_path) {
    if ($num_posts > variable_get("forum_hot_topic", 15)) {
      $icon = $new_posts ? "hot_new" : "hot";
    }
    else {
      $icon = $new_posts ? "new" : "default";
    }

    if ($comment_mode == 1) {
      $icon = "closed";
    }

    if ($theme->bbs_icons) {
      $file = $theme->bbs_icons[$icon];
    }
    else {
      // default
      $file = $base_path."/".$icon.".gif";
    }

    return "<img src=\"$file\">";
  }
  else {
    return "&nbsp;";
  }
}

function _forum_user_last_visit($nid) {
  global $user;
  static $history;
  if (!$history) {
    $result = db_query("SELECT nid, timestamp FROM history WHERE uid = '%d'", $user->uid);
    while ($t = db_fetch_object($result)) {
      $history[$t->nid] = $t->timestamp;
    }
  }
  return $history[$nid] ? $history[$nid] : 0;
}

// this will go away as soon as theme_invoke is committed
function _forum_theme_invoke() {
  global $theme;
  $args = func_get_args();
  $function = array_shift($args);

  if (method_exists($theme, $function)) {
    return call_user_method_array($function, $theme, $args);
  }
  else {
    return call_user_func_array($function, $args);
  }
}

function _forum_get_topic_order($sortby) {
  switch ($sortby) {
    case 1:
      return "date_sort DESC";
      break;
    case 2:
      return "date_sort ASC";
      break;
    case 3:
      return "num_comments DESC";
      break;
    case 4:
      return "num_comments ASC";
      break;
  }
}

?>