#!/usr/bin/env sh
helpmsg() {
  printf "%s\n" "desc: commandline calculator (ctrl+d to exit)"
  printf "%s\n" "demo: http://www.youtube.com/watch?v=JkyodHenTuc"
  printf "%s\n" "depends: python2, python3 or bc"
  printf "\n"
  printf "%s\n" "usage: ${0##*/}"
}
if [ "$1" = -h ] || [ "$1" = --help ]; then
  helpmsg
  exit 0
elif command -v python3 >/dev/null; then
  python3 -ic "from math import *; import cmath"
elif command -v python2 >/dev/null; then
  python2 -ic "from __future__ import division; from math import *; from random import *"
elif command -v bc >/dev/null; then
  bc -q -l
else
  printf "%s\n" "missing python2, python3 or bc"
  exit 1
fi