bash install script boilerplate/template.

bash-install

#!/usr/bin/env bash

# We need to source locally as we are not installed yet...
source ./core/.local/share/tylerd/lib/bash/styles.sh
source ./core/.local/share/tylerd/lib/bash/validation.sh

VERBOSE=
ACTION=install
POSITIONAL_ARGUMENTS=()

show_help() {
  cat << EOF
USAGE: $(basename "$0") [OPTIONS] [pkg1] [pkg2] ...

A script to install or remove one or more packages.

OPTIONS:
  -h, --help      Display this help message and exit
  -r, --remove    Remove/uninstall instead of installing (default: install)
  -v, --verbose   Enable verbose output for debugging

EXAMPLES:
  $(basename "$0")                 Install with default settings
  $(basename "$0") --verbose       Install with verbose output
  $(basename "$0") --remove        Remove/uninstall components
  $(basename "$0") -r -v           Remove with verbose output

EOF
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    -h | --help)
      show_help
      exit 1
      ;;
    -i | install)
      ACTION=install
      shift
      ;;
    -r | --remove)
      ACTION=remove
      shift
      ;;
    -v | --verbose)
      VERBOSE=1
      shift
      ;;
    -* | --*)
      error "Invalid option: '$1'!"
      show_help
      exit 1
      shift
      ;;
    *)
      POSITIONAL_ARGUMENTS+=("$1")
      shift
      ;;
  esac
done

# Restore positional parameters
set -- "${POSITIONAL_ARGUMENTS[@]}"

do_install() {
  echo "INSTALL"
}

do_remove() {
  echo "REMOVE"
}

completed() {

  if [ -n "$VERBOSE" ]; then
    debug "VERBOSE: "$VERBOSE""
    debug "ACTION: $ACTION"
    debug "POSITIONAL_ARGUMENTS: ${#POSITIONAL_ARGUMENTS[@]}:"
    
    for i in "${POSITIONAL_ARGUMENTS[@]}"; do
      echo " - $i"
    done
  fi
}

main() {
  case "$ACTION" in
    install)
      do_install
      ;;
    remove)
      do_remove 
      ;;

  esac

  completed
}

main