#!/bin/sh
set -euf

if [ -n "${DISPLAY-}" ] && [ -z "${FIFO_UEBERZUG-}" ]; then
  export FIFO_UEBERZUG="${TMPDIR:-/tmp}/lf-ueberzug-$$"

  cleanup() {
    exec 3>&-
    rm -- "$FIFO_UEBERZUG"
  }

  mkfifo -- "$FIFO_UEBERZUG"
  # Execute ueberzug in a loop in case it crashes. Ueberzug dies if its
  # associated window is closed. This breaks image previews when using tmux and
  # reattaching to an existing session.
  while ! ueberzug layer -s <"$FIFO_UEBERZUG"; do :; done &
  # Open the FIFO for writing. FIFO readers receive an EOF once all writers
  # have closed their respective file descriptors. Holding a file descriptor
  # will effectively keep ueberzug alive as long as lf lives.
  exec 3>"$FIFO_UEBERZUG"
  trap cleanup EXIT

  # Start lf without passing in the file descriptor. This is done to avoid the
  # lf server being passed the file descriptor, which would cause ueberzug to
  # live longer than is strictly necessary.
  lf "$@" 3>&-
else
  exec lf "$@"
fi