bash add template

scripts/template_bash.sh

@@ -0,0 +1,99 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+
+cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1
+
+trap cleanup SIGINT SIGTERM ERR EXIT
+
+usage() {
+	cat <<EOF
+Usage: $(basename "$0") [-h] [-v] [-f] -p param_value arg1 [arg2...]
+
+Script description here.
+
+Available options:
+
+-h, --help      Print this help and exit
+-v, --verbose   Print script debug info
+-f, --flag      Some flag description
+-p, --param     Some param description
+EOF
+exit
+}
+
+cleanup() {
+	trap - SIGINT SIGTERM ERR EXIT
+	# script cleanup here
+}
+
+setup_colors() {
+	if [[ -t 2 ]] && [[ -z "${NO_COLOR-}" ]] && [[ "${TERM-}" != "dumb" ]]; then
+		NOCOLOR='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m' ORANGE='\033[0;33m' BLUE='\033[0;34m' PURPLE='\033[0;35m' CYAN='\033[0;36m' YELLOW='\033[1;33m'
+	else
+		NOCOLOR='' RED='' GREEN='' ORANGE='' BLUE='' PURPLE='' CYAN='' YELLOW=''
+	fi
+}
+
+msg() {
+	echo >&2 -e "${1-}"
+}
+
+die() {
+	local msg=$1
+	local code=${2-1} # default exit status 1
+	msg "$msg"
+	exit "$code"
+}
+
+parse_params() {
+	# default values of variables set from params
+	flag=0
+	param=''
+
+	while :; do
+		case "${1-}" in
+			-h | --help)
+				usage
+				;;
+			-v | --verbose)
+				set -x
+				;;
+			--no-color)
+				NO_COLOR=1
+				;;
+			-f | --flag) # example flag
+				flag=1
+				;;
+			-p | --param) # example named parameter
+				param="${2-}"
+				shift
+				;;
+			-?*)
+				die "Unknown option: $1"
+				;;
+			*)
+				break
+				;;
+		esac
+		shift
+	done
+
+	args=("$@")
+
+  # check required params and arguments
+  [[ -z "${param-}" ]] && die "Missing required parameter: param"
+  [[ ${#args[@]} -eq 0 ]] && die "Missing script arguments"
+
+  return 0
+}
+
+parse_params "$@"
+setup_colors
+
+# script logic here
+
+msg "${RED}Read parameters:${NOCOLOR}"
+msg "- flag: ${flag}"
+msg "- param: ${param}"
+msg "- arguments: ${args[*]-}"