list GNU screen sessions and show preview for the session

fzf-screen-preview

#!/usr/bin/env bash
header_info='CTRL+D or ESCAPE to exit, ENTER attaches to a Detached screen'
export FZF_DEFAULT_OPTS="--header '${header_info}' --preview 'screen_peek {1}' --preview-window top,80%,follow"
function screen_peek()
{
  local screen=$1
  local pipe="$(mktemp -u)"
  mkfifo "${pipe}"
  screen -S "${screen}" -X hardcopy "${pipe}"
  cat "${pipe}" | sed -e '/./,$!d' -e :a -e '/^\n*$/{$d;N;};/\n$/ba'
  rm -f "${pipe}"
}
export -f screen_peek
screen_id=$(screen -ls | column -t | grep tached | fzf |  awk '{print $1}')
if [[ "${screen_id}" ]] ; then screen -x "${screen_id}"; fi