Support for deep namespace templates and strftime placeholders

This patch addes namespace templates will be used for all new namespaces in
the same namespace and the namespaces below. They have to be named
__template.txt

Additionally can strftime() place holders be used in namespace templates
to insert any part of the current time into a template.

darcs-hash:20080126165959-7ad00-9a820e42d237e1aa0828996ebc9cf3d67d453128.gz

inc/common.php

@@ -708,7 +708,25 @@ function pageTemplate($data){
   $id = $data[0];
   global $conf;
   global $INFO;
-  $tpl = io_readFile(dirname(wikiFN($id)).'/_template.txt');
+
+  $path = dirname(wikiFN($id));
+
+  if(@file_exists($path.'/_template.txt')){
+    $tpl = io_readFile($path.'/_template.txt');
+  }else{
+    // search upper namespaces for templates
+    $len = strlen(rtrim($conf['datadir'],'/'));
+    while (strlen($path) >= $len){
+      if(@file_exists($path.'/__template.txt')){
+        $tpl = io_readFile($path.'/__template.txt');
+        break;
+      }
+      $path = substr($path, 0, strrpos($path, '/'));
+    }
+  }
+  if(!$tpl) return '';
+
+  // replace placeholders
   $tpl = str_replace('@ID@',$id,$tpl);
   $tpl = str_replace('@NS@',getNS($id),$tpl);
   $tpl = str_replace('@PAGE@',strtr(noNS($id),'_',' '),$tpl);
@@ -716,6 +734,7 @@ function pageTemplate($data){
   $tpl = str_replace('@NAME@',$INFO['userinfo']['name'],$tpl);
   $tpl = str_replace('@MAIL@',$INFO['userinfo']['mail'],$tpl);
   $tpl = str_replace('@DATE@',date($conf['dformat']),$tpl);
+  $tpl = strftime($tpl);
   return $tpl;
 }