delete unused resources https://joplinapp.org/

joplin_clean_up_resources.rb

#
# Only can use for local file system synchronisation.
#
# Usage:
#   $ ruby joplin_clean_up_resources.rb /path/to/synchronise/directory
#

path = ARGV[0].chomp("/")
resources = `ls #{path}/.resource`
resources.split.each do |resource|
  next unless `grep -lr #{resource} #{path} | xargs grep -E "type_: 1\$" | wc -l`.chomp.to_i == 0
  `rm -f #{path}/#{resource}.md`
  `rm -f #{path}/.resource/#{resource}`
end