#!/bin/bash

##
# return 0 (true) if array (passed by name) contains element
# usage:
#   ARRAY=( a b c )
#   containsElement ARRAY 'a' => 0
function containsElement {
  isArray "$1" || (echo >&2 "ERROR: <$1> not an array!" && return 2)
  array_inter="$1[@]"
  array=("${!array_inter}")
  for i in "${array[@]}"; do [[ "$i" == "$2" ]] && return 0; done
  return 1
}

## return 0 (true) if arg1 (passed by name) is an array
function isArray {
  [[ "$(declare -p "$1" 2>/dev/null)" =~ "declare -a" ]] || return 1
}

function isDebian {
  grep ^ID=debian /etc/os-release
}

function isArch {
  grep ^ID=arch /etc/os-release
}

function os-release {
  grep ^ID= /etc/os-release | cut -d '=' -f2
}

function askConfirmation {
  case "$1" in
  y | Y | yes | YES)
    QUESTION="(Y/n)?"
    DEFAULT=0
    ;;
  *)
    QUESTION="(y/N)?"
    DEFAULT=1
    ;;
  esac
  read -rp "$QUESTION : " choice
  case "$choice" in
  y | Y | yes | YES) return 0 ;; #true
  n | no | N | NO) return 1 ;;   #false
  *) return $DEFAULT ;;
  esac
}