Emacs Ediff using emacsclient with exit code on exit

ediff

#!/bin/sh
# Author: Kirill Voronin <[email protected]>
# Ediff with exit code
# Opens ediff in existing Emacs window using emacsclient
# and returns exit code when *ediff-diff* buffer closed

get_buffer() {
  emacsclient --eval "(get-buffer \"$1\")"
}

ediff() {
  emacsclient --eval "(ediff-merge-files \"$1\" \"$2\" nil \"$3\")"
}

ediff_check() {
  [ "`get_buffer \"*ediff-diff*\"`" == "nil" ] && return 0
  return 1
}

ediff $1 $2 $3

while true; do
  ediff_check && exit 0
  sleep 1
done