Line number of error for Jinja Templates

[danfunk]

When running documentation through Jinja, if we encounter an error it would help to know on what line the error happened. Some of these templates can be 10's or 100's of lines long. This can also happen with document generation in word docs, it would be worth assuring that line numbers for those errors are included as well.

[cullerton]

These errors are raised by Jinja itself, not us.

        try:
            template = Template(raw_doc)
            return template.render(**spiff_task.data)
        except jinja2.exceptions.TemplateError as ue:
            raise ApiError.from_task(code="template_error", 
                                     message="Error processing template for task %s: %s" %
                                     (spiff_task.task_spec.name, str(ue)), task=spiff_task)

I believe we would have to muck with Jinja's code to get the line number

[cullerton]

Looking into the Jinja code a little, and they don't think in terms of line numbers. It's one big long string to them.