- refactoring of comments.php

- creation of function get_thumbnail_src used everywhere a thumbnail must be
  displayed

- creation of function parse_comment_content (used in comments.php and
  picture.php)

- concerning undefined index on arrays retrieved in database, instead of
  testing possibly unset values, use of @ operator (smarter...)

- add pre tag in default.css stylesheet for debugging purpose (need to have
  left aligned text)


git-svn-id: http://piwigo.org/svn/trunk@579 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions.inc.php

@@ -546,4 +546,52 @@ function get_templates()
 {
   return get_dirs(PHPWG_ROOT_PATH.'template');
 }
+
+/**
+ * returns thumbnail filepath (or distant URL if thumbnail is remote) for a
+ * given element
+ *
+ * this function could have taken only the element id as parameter but to
+ * optimize database access we directly ask file, storage category
+ * identifier and extension since when this function is called,
+ * PhpWebGallery should have all these infos. No need to retrieve them
+ * another time in the database.
+ *
+ * the returned string can represente the filepath of the thumbnail or the
+ * filepath to the corresponding icon for non picture elements
+ *
+ * complete directories are cached to be used more than once during a page
+ * generation (many thumbnails of the same category on the same page)
+ *
+ * @param string file
+ * @param int storage_category_id
+ * @param string tn_ext
+ * @return string
+ */
+function get_thumbnail_src($file, $storage_category_id, $tn_ext = '')
+{
+  global $conf, $user, $array_cat_directories;
+  
+  if (!isset($array_cat_directories[$storage_category_id]))
+  {
+    $array_cat_directories[$storage_category_id] =
+      get_complete_dir($storage_category_id);
+  }
+  
+  if ($tn_ext != '')
+  {
+    $src = $array_cat_directories[$storage_category_id];
+    $src.= 'thumbnail/'.$conf['prefix_thumbnail'];
+    $src.= get_filename_wo_extension($file);
+    $src.= '.'.$tn_ext;
+  }
+  else
+  {
+    $src = PHPWG_ROOT_PATH;
+    $src.= 'template/'.$user['template'].'/mimetypes/';
+    $src.= strtolower(get_extension($file)).'.png';
+  }
+
+  return $src;
+}
 ?>