list-all

#!/usr/bin/env bash

set -e
set -o pipefail

url=https://releases.hashicorp.com/terraform/

ruby -rubygems -ropen-uri <<SCRIPT
begin
  response = open("${url}").read
  puts response.
    each_line.
    map {|l| l =~ %r{terraform/([0-9.]+)/} ? Regexp.last_match[1] : nil }.
    compact.
    map { |version| Gem::Version.new(version) }.
    sort.
    join(" ")

rescue StandardError => err
  warn "Could not fetch list of terraform versions"
  warn "Response:\n#{response}"
  raise err
end
SCRIPT