#!/bin/bash
# jeremystartm's jobrunner

if [ -f "${HOME}/.local/share/jobrunner.env" ]; then
	source "${HOME}/.local/share/jobrunner.env"
fi

if [ -z "${JOBRUNNER_TIMEOUT}" ]; then
  export "JOBRUNNER_TIMEOUT=0.5s"
fi
if [ -z "${JOBRUNNER_RUNDIR}" ]; then
  export "JOBRUNNER_RUNDIR=${XDG_RUNTIME_DIR}/jobrunner/"
fi
if [ -a "${JOBRUNNER_RUNDIR}" ] && [ ! -d "${JOBRUNNER_RUNDIR}" ]; then
  echo ":: Error: \"${JOBRUNNER_RUNDIR}\" is not a directory, aborting."
else
  echo ":: Creating RUNDIR"
  mkdir -p "${JOBRUNNER_RUNDIR}"
fi
if [ -f "${JOBRUNNER_RUNDIR}/jobrunner.pid" ]; then
  echo ":: Error: The jobrunner daemon is already running."
  echo "          If you think that this is an error, remove"
  echo "          \"${JOBRUNNER_RUNDIR}/jobrunner.pid\"."
  exit 1
fi
echo ":: Writing PID"
echo "$$" > "${JOBRUNNER_RUNDIR}/jobrunner.pid"

echo ":: Started jobrunner daemon" &> "${JOBRUNNER_RUNDIR}/jobrunner.log"

function log() {
	echo ":: $*"
	echo ":: $*" &>> "${JOBRUNNER_RUNDIR}/jobrunner.log"
}
function logcmd() {
	echo ":: EXEC \"$*\""
	$* &>> "${JOBRUNNER_RUNDIR}/jobrunner.log"
}

log "Entering loop"
while true; do
  if [ ! -d "${JOBRUNNER_RUNDIR}" ]; then
    logcmd mkdir -p "${JOBRUNNER_RUNDIR}"
  fi
  if [ -f "${JOBRUNNER_RUNDIR}/jobrunner.cmd" ]; then
    log "Executing command"
    JOBRUNNER_COMMAND="$(cat "${JOBRUNNER_RUNDIR}"/jobrunner.cmd)"
    logcmd rm -rf "${JOBRUNNER_RUNDIR}/jobrunner.cmd"
    if [ "${JOBRUNNER_COMMAND}" == "EXIT" ]; then
      log "Exiting, as requested"
      logcmd rm -rf "${JOBRUNNER_RUNDIR}"
      exit 1
    fi
    bash -c "${JOBRUNNER_COMMAND}" &
  fi
  sleep "${JOBRUNNER_TIMEOUT}"
done