#!/bin/bash
shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
if pgrep -G iank -u iank -f '^emacs --daemon$' &>/dev/null; then
  elisp=$(cat /usr/local/bin/unsaved-buffers.el)
  emacsout=$(sudo -u iank env XDG_RUNTIME_DIR=/run/user/1000 emacsclient --eval "$elisp" ||:)
  bufs=$(printf "%s\n" "$emacsout"|sed '/^"nil"$/d;s/^"(/E: /;s/)"$//')
  if [[ $bufs ]]; then
    echo "error: on $HOSTNAME, unsaved emacs files: $bufs" >&2
    exit 1
  fi
fi