#!/bin/sh
set -e
. ${PREFIX:-~/.local}/lib/ejmejl/common
unseen="$(assign Unseen-Sequence unseen)"

usage() {
  echo 'usage: loop ncol nrow +folder days-of-inactivity command ...' >&2
  exit 2
}
test $# -gt 4 || usage
ncol="$1"; shift
nrow="$1"; shift
folder="$1"; shift; test "${folder#+}" != "$folder" || usage
days_required="$1"; test "$days_required" -ge 0 2> /dev/null || usage; shift
test -x "$(command -v "$1")" || usage

if ps x -o tty,etime | grep '^\? *[0-9]\{1,\}-' > /dev/null; then
  # I am running something in an interactive shell, so do nothing.
  :
else
  days_actual="$(ps x -o tty,etime | sed -n '/^\? *[0-9]\{1,\}-/ s/\?  *\([0-9]\{1,\}\)-.*/\1/p' | sort -n | head -n1)"
  if test -n "$days_actual" && test "$days_actual" -ge "$days_required"; then
    # I am probably not logged in, so incdlvr and pack.
    ${PREFIX:-~/.local}/bin/incdlvr 2> /dev/null || :
    ${PREFIX:-~/.local}/bin/pack -q "$ncol" "$nrow" "$folder" "$unseen" | "$@"
  fi
fi