Tiltfile

def min_tilt_version(min_version):
  # this assumes that the tit version command always returns
  # v0.13.0, built 2020-04-01
  # Also supports dev versions
  # v0.13.0-dev, built 2020-04-03
  tilt_bin = os.environ.get('TILT_BIN', 'tilt')
  ver_string = str(local('%s version' % tilt_bin, quiet=True))
  # Clean out the version file so its in the format 0.13.0
  versions = ver_string.split(', ')
  # pull first string and remove the `v` and `-dev`
  version = versions[0].replace('-dev', '').replace('v', '')

  # Python allows you to compare two tuples
  # (0, 12, 0) < (0, 12, 1)
  tup_version = _version_tuple(version)
  tup_min_version = _version_tuple(min_version)

  if tup_version < tup_min_version:
    print('+--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+')
    print('|                      Tilt Version is out of date!                          |')
    print('|       Please upgrade https://docs.tilt.dev/upgrade.html                    |')
    print('+--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+')
    fail('Tilt version is out of date minimum required version is [%s]' % min_version)

# Private methods
def _version_tuple(v):
  return [int(str_num) for str_num in v.split(".")]