Add exclusion in tag search

  * Searching '-mytag' will now exlude all shaares with 'mytag' tag.
  * All tags starting with a '-' are renamed without it (through the Updater).
  * Unit tests.

Minor code changes:

 * LinkDB->filter() can now take no parameters (get all link depending on logged status).
 * tagsStrToArray() is now static and filters blank tags.

1 files changed, 15 insertions, 0 deletions

diff --git a/application/Updater.php b/application/Updater.php
index 20ae0c4d..773a1ffa 100644
--- a/application/Updater.php
+++ b/application/Updater.php
@@ -131,6 +131,21 @@ class Updater
 
         return true;
     }
+
+    /**
+     * Rename tags starting with a '-' to work with tag exclusion search.
+     */
+    public function updateMethodRenameDashTags()
+    {
+        $linklist = $this->linkDB->filter();
+        foreach ($linklist as $link) {
+            $link['tags'] = preg_replace('/(^| )\-/', '$1', $link['tags']);
+            $link['tags'] = implode(' ', array_unique(LinkFilter::tagsStrToArray($link['tags'], true)));
+            $this->linkDB[$link['linkdate']] = $link;
+        }
+        $this->linkDB->savedb($this->config['config']['PAGECACHE']);
+        return true;
+    }
 }
 
 /**