#!/bin/sh

[ -z $XKCD_DBG ] || set -x
err () {
  printf "err: %s\n" ${1}
  [ -z "${2}" ] && exit 1
  exit ${2}
}
getImageForComic() {
  [ -z ${1} ] && a="" || a="$1/"
  curl --silent https://xkcd.com/${a} | grep 'imgs.xkcd.com/comics/' | sed 1q | grep -o 'https://imgs\.xkcd\.com/comics/.*\....'
}
viewImage() {
  a=$(mktemp)
  curl --silent $(getImageForComic ${1}) -o $a
  feh $a
}
proghelp() {
  printf "\
xkcd - view xkcd comics

=> [v]iew  [id]    - View comic with id [id]
=> [g]et   [id]    - Get url for comic [id]
"
}
case $1 in
  'v'*)
    viewImage $2
    exit 0
    ;;
  'g'*)
    getImageForComic $2
    exit 0
    ;;
  *)
    proghelp
    exit 0
    ;;
esac
exit 0