[chaley]

Originally Posted by Noughty

Now I am editing it to remove one tag but it fails to remove a comma. So I get a list with one extra comma. I use function re and tried to simply write the tag, also tried with list_intersection., list item and so on I still remain with a comma. What function to use to remove one tag without leaving comma?

You are saying that list_sort without the re functions returns a list with a comma at the end? Or that 'tag' is in one or both of #genre or #character, but it is not being removed from the first list? Or that you want to unconditionally remove 'tag' from the result, even if it is not in the union of '#shelf' and 'tags'?

If it is the latter, then I would try something like the following:

program:
list_sort(
   list_difference(
      list_union(field('#shelf'), field('tags'), ','),
      list_union(
         "tag", 
         strcat(field('#genre'), ',',
                field('#mode'), ',', 
                field('#character'), ',',
                field('#length')),
         ','), 
      ','),
   0, ',')

This works by doing a union of the list "tag" and a manually constructed large list consisting of items in #genre through #length. It is OK that there might be duplicates in this constructed list, because the list_union will remove them from the final result. In the current release, only the second parameter to list_union can have duplicates. In the next release, either parameter can have duplicates.