if [[ ${globaldebug} == "true" ]]; then
  local debug=true
else
  local debug=false
fi
typeset -A pages_cache
  
_list_pages
if [[ -f $pages_cache_file ]]; then
  while IFS=':' read -r name hash; do
    pages_cache[$name]=$hash
  	if (${debug}) _msg debug "${0:t}_msg_1" " ${pages_cache[${name}]}"
  done < "$pages_cache_file"
fi
pages_array=()
for file in ${pages_file_array[@]}; do
  current_hash=$(md5sum "$file" | awk '{print $1}')
      
  if (${debug}) _msg debug "${0:t}_msg_2" " ${pages_cache[$file]}"
  if (${debug}) _msg debug "${0:t}_msg_3" " current_cache: ${current_hash}"
  if [[ ${pages_cache[$file]} != "$current_hash" ]]; then
  	if (${debug}) _msg debug "${0:t}_msg_4" " ${pages_cache[$file]}"
  	if (${debug}) _msg debug "${0:t}_msg_5" " current_cache: ${current_hash}"
    pages_array+=("$file")
    pages_cache[$file]=$current_hash
  fi
done
: >| "$pages_cache_file"
for name in "${(@k)pages_cache}"; do
  echo "$name:${pages_cache[$name]}" >> "$pages_cache_file"
done