#!/usr/bin/env bash
set -euo pipefail
IFS=$'\n\t'

function usage() {
  echo "Usage: weather [OPTION] [location]"
  echo "  -1  Print weather forecast for 1 day"
  echo "  -a  Print all weather forecasts"
  echo "  -h  Display this help message"
  exit 1
}

lines="1,7"

OPTIND=1
while getopts ":1ah" opt; do
  case $opt in
    1) lines="1,17" ;;
    a) lines="" ;;
    h) usage ;;
    ?) echo "Unknown option: $OPTARG"; usage ;;
  esac
done
shift $((OPTIND-1))

curl -s wttr.in/${1:-} | sed -n "$lines"p