Add a script to delete tags that are too long

official/delete_long_tags.lua

@@ -0,0 +1,34 @@
+--[[
+    This file is part of darktable,
+    copyright (c) 2014 Tobias Ellinghaus
+
+    darktable is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    darktable is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
+]]
+
+local dt = require "darktable"
+
+dt.preferences.register("delete_long_tags", "length", "integer",
+                        "maximum length of tags to keep",
+                        "tags longer than this get deleted on start",
+                        666, 0, 65536)
+
+local max_length = dt.preferences.read("delete_long_tags", "length", "integer")
+
+for _,t in ipairs(dt.tags) do
+  local len = #t.name
+  if len > max_length then
+    print("deleting tag `"..t.name.."' (length: "..len..")")
+    t:delete()
+  end
+end