code: def main(source):
      
      if source is None:
          click.echo(
              "You need to supply a file or url to a schema to a swagger schema, for"
              "the validator to work."
          )
          return 1
      try:
          load(source)
          click.echo("Validation passed")
          return 0
      except ValidationError as e:
          raise click.ClickException(str(e))
docs: For a given command line supplied argument, negotiate the content, parse
      the schema and then return any issues to stdout or if no schema issues,
      return success exit code.