run.sh

#!/bin/bash

script="run.sh"

function example {
  # specifies a script usage example
  echo -e "example: sh $script -n Louis -b 20210709 -a 27 -l -d"
}

function usage {
  # specifies the script's usage
  echo -e "usage: $ sh $script -n <name> [-b <birth date>] [-a <age>] [-l <alive>] [-d] [-h|--help]\n"
}

function help {
  usage

  echo -e "MANDATORY:"
  echo -e "\t -n                          specifies the name\n"
  echo -e "OPTIONAL:"
  echo -e "\t -b [date|YYYYMMDD]          specifies the birth date, either use 'date' for current date or YYYYMMDD format"
  echo -e "\t -a                          specifies the age of this person"
  echo -e "\t -l                          specifies whether this person is currently alive"
  echo -e "\t -d                          debug-mode: logging enabled"
  echo -e "\t -h, --help                  prints this help\n"
}

function return_help {
  # find command-line argument 'help' or 'h' and return help, exit script
  for argument in "$@"
  do
    if [[ $argument == "--help" ]] || [[ $argument == "-h" ]]; then
      help
      exit
    fi
  done
}

# initialize all mandatory and optional arguments from command-line
while getopts :n:b:a:ld flag
do
  case "${flag}" in
    n) name=${OPTARG};;
    b) birth_date=${OPTARG};;
    a) age=${OPTARG};;
    l) alive=${OPTARG};;
    d) debug=d;;
    \? ) usage;;
  esac
done

if [[ $# -eq 0 ]] || [[ -z ${name} ]]; then
  # no command-line arguments OR $name missing, show usage and exit
  usage
  exit
fi

# look for --help or -h CLA and return help statement
return_help "$@"

# instantiate our keyword arguments for run.py
run_py_args="--name $name "

if [[ ${birth_date} ]]; then
  run_py_args+="--date $birth_date "
fi

if [[ ${age} ]]; then
  run_py_args+="--age $age "
fi

if [[ ${alive} ]]; then
  run_py_args+="--alive "
fi

if [[ -z ${debug} ]]; then
  # no debug supplied with arg [-d]
  run_py_args+="--debug False"
else
  run_py_args+="--debug True"
fi

echo "$ python3 run.py $run_py_args"
python3 run.py $run_py_args