Select all untagged images in the collection. Pictures containg only automatic tags added by darktable are also considered untagged

contrib/select_untagged.lua

@@ -0,0 +1,65 @@
+--[[
+    This file is part of darktable,
+    copyright (c) 2017 Jannis_V
+
+    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/>.
+]]
+
+--[[
+Enable selection of untagged images (darktable|* tags are ignored)
+]]
+
+local dt = require "darktable"
+require "official/yield"
+local gettext = dt.gettext
+
+dt.configuration.check_version(...,{3,0,0},{4,0,0},{5,0,0})
+
+-- Tell gettext where to find the .mo file translating messages for a particular domain
+gettext.bindtextdomain("select_untagged",dt.configuration.config_dir.."/lua/locale/")
+
+local function _(msgid)
+  return gettext.dgettext("select_untagged", msgid)
+end
+
+local function stop_job(job)
+  job.valid = false
+end
+
+local function select_untagged_images()
+  job = dt.gui.create_job(_("select untagged images"), true, stop_job)
+
+  local selection = {}
+
+  for key,image in ipairs(dt.collection) do
+    if(job.valid) then
+      job.percent = (key-1)/#dt.collection
+      local tags =  dt.tags.get_tags(image)
+      local hasTags = false
+      for _,tag in ipairs(tags) do
+        if not string.match(tag.name,"darktable|") then
+          hasTags = true
+        end
+      end
+      if hasTags == false then
+        table.insert(selection,image)
+      end
+    else
+      break
+    end
+  end
+
+  job.valid = false
+  dt.gui.selection(selection)
+end
+
+dt.gui.libs.select.register_selection(_("select untagged"),select_untagged_images,_("select all images containing no tags or only tags added by darktable"))