コマンドキュー

q.sh

#!/usr/bin/env bash
# https://betterdev.blog/minimal-safe-bash-script-template/
set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT

usage() {
  cat <<EOF
Usage: $(basename "${BASH_SOURCE[0]}") [command]
EOF
  exit
}

SOCKET="/tmp/kotet-q.sock"
FIFO="$(mktemp -u)"
SERVER_MODE=0

cleanup() {
  trap - SIGINT SIGTERM ERR EXIT
  # script cleanup here
  [[ ${SERVER_MODE} -eq 1 ]] && rm -f ${SOCKET}
  [[ ${SERVER_MODE} -eq 1 ]] && rm -f ${FIFO}
}

setup_colors() {
  if [[ -t 2 ]] && [[ -z "${NO_COLOR-}" ]] && [[ "${TERM-}" != "dumb" ]]; then
    NOFORMAT='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m' ORANGE='\033[0;33m' BLUE='\033[0;34m' PURPLE='\033[0;35m' CYAN='\033[0;36m' YELLOW='\033[1;33m'
  else
    NOFORMAT='' RED='' GREEN='' ORANGE='' BLUE='' PURPLE='' CYAN='' YELLOW=''
  fi
}

msg() {
  echo >&2 -e "${1-}"
}

die() {
  local msg=$1
  local code=${2-1} # default exit status 1
  msg "$msg"
  exit "$code"
}

parse_params() {
  while :; do
    case "${1-}" in
    -h | --help) usage ;;
    -v | --verbose) set -x ;;
    --no-color) NO_COLOR=1
      ;;
    -?*) die "Unknown option: $1" ;;
    *) break ;;
    esac
    shift
  done

  command=("$@")

  return 0
}

parse_params "$@"
setup_colors

if test -S "${SOCKET}"; then
    [[ ${#command[@]} -eq 0 ]] && die "Missing script arguments"
    echo "${command[*]-}" | nc -U ${SOCKET}
    msg "${GREEN}the command added to queue: ${command[*]-}${NOFORMAT}"
    exit
fi

SERVER_MODE=1
msg "${GREEN}Listening on ${SOCKET} ...${NOFORMAT}"

mkfifo ${FIFO}

(
    while true; do
        nc -U -l ${SOCKET} | ( read line; echo ${line} > ${FIFO} )
    done
) &

while true; do
    line=$(cat ${FIFO})

    msg "${GREEN}Q: ${line}${NOFORMAT}"
    ${line}
done

wait