Bash script template

bash_template.sh

#!/usr/bin/env bash
#-------------------------------------------------------------------
# Name: 
# Author: Team - Author
#
# Description:
#
#-------------------------------------------------------------------
#                             CHANGELOG
#   V0.0.1    Author
#             Initialization
#===================================================================
set -o errexit
set -o nounset
set -o pipefail
if [[ "${TRACE-0}" == "1" ]]; then
  set -o xtrace
fi

function print_error() {
  echo "${1}" >&2
}

function usage() {
cat <<END_USAGE
How to use the script :
  ${0} -r "my required arg" -o "my optional arg"
  ${0} --required "my required arg"
The available arguments :
  (Required) -r, --required <value>       :    required argument
  (Optional) -o, --optional <value>       :    optional argument
  (Optional) -h, --help                   :    show this help message and exit
END_USAGE
}

#-------------------------------------------------------------------#
#                         GLOBAL VARIABLES                          #
#-------------------------------------------------------------------#
NOW=$(date +"%Y%m%d%H%M%S")

while [[ "${#}" -gt 0 ]]
do
  case "${1}" in
  --help|-h)
    usage
    exit 0
    ;;
  -r|--required)
    shift #go to next parameter to get REQUIRED_ARG
    REQUIRED_ARG="${1}"
    ;;
  -o|--optional)
    shift #go to next parameter to get OPTIONAL_ARG
    OPTIONAL_ARG="${1}"
    ;;
  esac
  shift
done

if [ -z "${REQUIRED_ARG-}" ]
then
  print_error "$(usage)"
  exit 1
fi

while true
do
  read -p "You're asking to ... ${REQUIRED_ARG}, is that right? (yes/no) " yesno
  case $yesno in
  [Yy]*|yes) break;;
  [Nn]*|no ) exit;;
  esac
done


# Get logs in logfile from now
exec > >(tee "${0%.*}-${NOW}.log") 2>&1
#-------------------------------------------------------------------#
#                         COMMON FUNCTIONS                          #
#-------------------------------------------------------------------#

# This function print in color
# Inputs:
#   $1: log type
#     error  : red
#     warning: yellow
#     info   : blue
#     title  : bold blue for section title
#   $2: the text to print
#####################################################################
function print_in_color() {
  if [ "${1}" == "error" ]; then
  color=31
  elif [ "${1}" == "warning" ]; then
    color=93
  elif [ "${1}" == "success" ]; then
    color=92
  elif [ "${1}" == "info" ]; then
    color=34
  elif [ "${1}" == "title" ]; then
    color="34;1"
    echo #Blank line before section title
  else
    echo -ne  "\e[31mERROR : Non recognized color\e[39m"
    exit 1
  fi
  echo -ne "\e[${color}m${2}\e[0m"
}

#-------------------------------------------------------------------#
#                         SCRIPT FUNCTIONS                          #
#-------------------------------------------------------------------#


#-------------------------------------------------------------------#
#                              MAIN                                 #
#-------------------------------------------------------------------#
echo "Your required argument is: ${REQUIRED_ARG}"