drupal/modules/archive.module

<?php
// $Id$

function archive_system($field){
  $system["description"] = t("Displays a calendar to navigation old content.");
  return $system[$field];
}

function archive_calendar($original = 0) {

  // Extract today's date:
  $today = mktime(23, 59, 59, date("n", time()), date("d", time()), date("Y", time()));

  // Extract the requested date:
  if (arg(0) == "archive" && arg(3)) {
    $year = arg(1);
    $month = arg(2);
    $day = arg(3);

    $requested = mktime(23, 59, 59, $month, $day, $year);
  }
  else {
    $year = date("Y", time());
    $month  = date("n", time());
    $day = date("d", time());

    $requested = $today;
  }

  // Extract first day of the month:
  $first = date("w", mktime(0, 0, 0, $month, 1, $year));

  // Extract last day of the month:
  $last = date("t", mktime(0, 0, 0, $month, 1, $year));

  // Calculate previous and next months dates and check for shorter months (28/30 days)
  $prevmonth = mktime(23, 59, 59, $month - 1, 1, $year);
  $prev = mktime(23, 59, 59, $month - 1, min(date("t", $prevmonth), $day), $year);
  $nextmonth = mktime(23, 59, 59, $month + 1, 1, $year);
  $next = mktime(23, 59, 59, $month + 1, min(date("t", $nextmonth), $day), $year);

  // Generate calendar header:
  $output .= "\n<!-- calendar -->\n";
  $output .= "<table width=\"100%\" border=\"1\" cellspacing=\"0\" cellpadding=\"1\">\n";
  $output .= " <tr><td align=\"center\" colspan=\"7\"><small>". l("&lt;", "archive/". date("Y/m/d", $prev)) ." ". date("F Y", $requested) ." ". ($nextmonth <= time() ? l("&gt;", "archive/". date("Y/m/d", $next)) : "&gt;") ."</small></td></tr>\n";

  // First day of week (0 => Sunday, 1 => Monday, ...)
  $weekstart = variable_get("default_firstday", 0);

  // Last day of week
  ($weekstart - 1 == -1 ) ? $lastday = 6 : $lastday = $weekstart - 1;

  // Generate the days of the week:
  $firstcolumn = mktime(0, 0, 0, 3, 20 + $weekstart, 1994);

  $output .= " <tr>";
  for ($i = 0; $i < 7; $i++) {
    $output .= "<td align=\"center\"><small>". substr(ucfirst(t(date("l", $firstcolumn + $i * 86400))), 0, 1) ."</small></td>";
  }
  $output .= "</tr>\n";

  // Initialize temporary variables:
  $nday = 1;
  $sday = $first;

  // Loop through all the days of the month:
  while ($nday <= $last) {
    // Set up blank days for first week of the month:
    if ($first != $weekstart) {
      $blankdays = ($first - $weekstart + 7) % 7;
      $output .= " <tr><td colspan=\"$blankdays\">&nbsp;</td>\n";
      $first = $weekstart;
    }

    // Start every week on a new line:
    if ($sday == $weekstart) {
      $output .=  " <tr>\n";
    }

    // Print one cell:
    $date = mktime(0, 0, 0, $month, $nday, $year);

    if ($date == $requested) {
      $output .= "  <td align=\"center\"><small><b>$nday</b></small></td>\n";
    }
    else if ($date > $today) {
      $output .= "  <td align=\"center\"><small>$nday</small></td>\n";
    }
    else {
      $output .= "  <td align=\"center\"><small>". l($nday, "archive/$year/$month/$nday", array("style" => "text-decoration: none;")) ."</small></td>\n";
    }

    // Start every week on a new line:
    if ($sday == $lastday) {
      $output .=  " </tr>\n";
    }

    // Update temporary variables:
    $sday++;
    $sday = $sday % 7;
    $nday++;
  }

  // Complete the calendar:
  if ($sday != $weekstart) {
    $end = (7 - $sday + $weekstart) % 7;
    $output .= "  <td colspan=\"$end\">&nbsp;</td>\n </tr>\n";
  }

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

  return $output;
}

function archive_block($op = "list", $delta = 0) {
  global $date;
  if ($op == "list") {
    $blocks[0]["info"] = t("Calendar to browse archives");
    return $blocks;
  }
  else {
    switch ($delta) {
      case 0:
        $block["subject"] = t("Browse archives");
        $block["content"] = archive_calendar();
        return $block;
    }
  }
}

function archive_link($type) {

  $links = array();

  if ($type == "page" && user_access("access content")) {
    $links[] = l(t("archives"), "archive", array("title" => t("Read the older content in our archive.")));
  }

  return $links;
}

function archive_page() {
  global $date, $month, $year, $meta;

  $op = $_POST["op"];
  $edit = $_POST["edit"];

  theme("header");

  if (user_access("access content")) {
    if ($op == t("Show")) {
      $year = $edit["year"];
      $month = $edit["month"];
      $day = $edit["day"];
    }
    else {
      $year = arg(1);
      $month = arg(2);
      $day = arg(3);
    }

    $date = mktime(0, 0, 0, $month, $day, $year);

    /*
    ** Prepare the values of the form fields:
    */

    $years = array(2000 => "2000", 2001 => "2001", 2002 => "2002", 2003 => "2003", 2004 => "2004", 2005 => "2005");
    $months = array(1 => t("January"), 2 => t("February"), 3 => t("March"), 4 => t("April"), 5 => t("May"), 6 => t("June"), 7 => t("July"), 8 => t("August"), 9 => t("September"), 10 => t("October"), 11 => t("November"), 12 => t("December"));
    for ($i = 1; $i <= 31; $i++) $days[$i] = $i;

    $start = form_select("", "year", ($year ? $year : date("Y")), $years). form_select("", "month", ($month ? $month : date("m")), $months) . form_select("", "day", ($day ? $day : date("d")), $days) . form_submit(t("Show"));
    $start = ereg_replace("<[/]?p>", "", $start);

    theme("box", t("Archives"), form($start));

    /*
    ** Fetch nodes for the selected date, or current date if none
    ** selected.
    */

    if ($year && $month && $day) {
      $result = db_query_range("SELECT nid FROM node WHERE status = '1' AND created > %d ORDER BY created", $date, 0, 20);

      while ($nid = db_fetch_object($result)) {
        node_view(node_load(array("nid" => $nid->nid)), 1);
      }
    }
  }
  else {
    message_access();
  }

  theme("footer");
}

function archive_settings() {

  $output .= form_select( t("First day of week"), "default_firstday", variable_get("default_firstday", 0), array(0 => t("Sunday"), 1 => t("Monday"), 2 => t("Tuesday"), 3 => t("Wednesday"), 4 => t("Thursday"), 5 => t("Friday"), 6 => t("Saturday")), t("The first day of the week.  By changing this value you choose how the calendar block is rendered."));

  return $output;
}

?>