Better HN search with bash

The interface for Algolia search is horrible for picking date ranges so I made this little bash function to fix it (noting that "open" is an alias to "xdg-open" for me on Linux).

Might work in other shells too.

  function hn() {
      if test $# -lt 1 || test $# -gt 3; then
          echo "Usage: $0 <query> [start=1970] [end=now]"
          echo "start and end are ISO dates like 2014-03-23."
          return 1
      fi
      query=$1
      start=$(test $# -gt 1 && date --date "$2" +%s || date --date @0 +%s)
      end=$(test $# -gt 2 && date --date "$3" +%s || date +%s)
      url="https://hn.algolia.com/?sort=byPopularity&prefix=false&page=0&type=story&query=${query}&dateRange=custom&dateStart=${start}&dateEnd=${end}"
      echo $url
      open "$url"
  }