if [[ ${globaldebug} == "true" ]]; then
  local debug=true
else
  local debug=false
fi

local content="${1}"
local modified_content=""
echo "${content}" | while IFS= read -r line; do
  if [[ ${line} == *"#ytvideo"* ]]; then
    if (${debug}) _msg debug "${0:t}_msg_1" " ${line}"
    local yt_id=$(echo "${line}" | awk -F'#ytvideo ' '{print $2}')
    local yt_iframe="<iframe width=\"560\" height=\"315\" src=\"https://www.youtube.com/embed/${yt_id}\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen></iframe>"
    line=${line//"#ytvideo ${yt_id}"/${yt_iframe}}
  fi
  modified_content+="${line}\n"
done
echo -e "${modified_content}"