This uses feh's caption mode to enter/display image tags, which are then
stored in the current directory as symlinks below
.tags/. The script is
written in zsh.
-- feh options] [ files ...]
imagetag displays all files in the current directory.
--untagged makes it only display images with no associated tags. If you
specify files, only those are shown.
imagetag always saves the tags in the current directory (in
.tags/tagname/) and does not support recursion.