From 3b67b22225c54b28c5ea8b118710ef450016fb86 Mon Sep 17 00:00:00 2001
From: ArthurHoaro <arthur@hoa.ro>
Date: Fri, 4 Aug 2017 19:10:00 +0200
Subject: Move tag renaming code to LinkDB and unit test it

---
 application/LinkDB.php | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'application')

diff --git a/application/LinkDB.php b/application/LinkDB.php
index 8ca0fab3..5e38e848 100644
--- a/application/LinkDB.php
+++ b/application/LinkDB.php
@@ -463,6 +463,39 @@ You use the community supported version of the original Shaarli project, by Seba
         return $tags;
     }
 
+    /**
+     * Rename or delete a tag across all links.
+     *
+     * @param string $from Tag to rename
+     * @param string $to   New tag. If none is provided, the from tag will be deleted
+     *
+     * @return array|bool List of altered links or false on error
+     */
+    public function renameTag($from, $to)
+    {
+        if (empty($from)) {
+            return false;
+        }
+        $delete = empty($to);
+        // True for case-sensitive tag search.
+        $linksToAlter = $this->filterSearch(['searchtags' => $from], true);
+        foreach($linksToAlter as $key => &$value)
+        {
+            $tags = preg_split('/\s+/', trim($value['tags']));
+            if (($pos = array_search($from, $tags)) !== false) {
+                if ($delete) {
+                    unset($tags[$pos]); // Remove tag.
+                } else {
+                    $tags[$pos] = trim($to);
+                }
+                $value['tags'] = trim(implode(' ', array_unique($tags)));
+                $this[$value['id']] = $value;
+            }
+        }
+
+        return $linksToAlter;
+    }
+
     /**
      * Returns the list of days containing articles (oldest first)
      * Output: An array containing days (in format YYYYMMDD).
-- 
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