[Flask] Recursively expanding template content

Thu Apr 27 02:04:20 EDT 2017

Hello,

here’s what I’d do.

• read the raw markdown
• parse it as a template: parsed_md = render(raw_md)
• convert it to Markup
• now render the “parent” template: render_template('main.html',
md=markup_md)

Best,
Gergely

On Wed, Apr 26, 2017, 21:30 Skip Montanaro <skip.montanaro at gmail.com> wrote:

> This will probably sound weird, but I have an index.html template
> which basically looks like
>
> ...
> <body>
>   {{ content }}
> </body>
> ...
>
> The content comes from a Markdown file generated by
>
> import markdown
> from flask import Markup
>
> ...
>
> content = Markup(markdown.markdown(raw))
>
> where "raw" is the raw content of the Markdown file.
>
> I'd like to embed some Jinja2 references in the Markdown file and have
> them automagically processed as if they appeared in the index.html
> template. In particular, I'd like to call render_template with the
> netloc:
>
> content = Markup(markdown.markdown(raw))
> netloc = urlparse.urlparse(request.url).netloc
> return render_template("index.html", **locals())
>
> Currently, I fudge by just replace()ing the "{{ netloc }}" references:
>
> content = Markup(markdown.markdown(raw)).replace("{{ netloc }}", netloc)
>
> That works, but seems crude. I tried explicitly calling
> Jinja2.Template().render():
>
> content = Markup(markdown.markdown(raw))
> netloc = urlparse.urlparse(request.url).netloc
> template = jinja2.Template(content)
> content = template.render(netloc=netloc)
> return render_template("index.html", **locals())
>
> That kinda worked, but left me with a bunch of escaped HTML entities.
> My guess is that render_template doesn't like "<" and such in its
> input strings.
>
> I suspect there is an elegant solution to this, but as I am not wise
> in the ways of Flask, Jinja, or markdown, it's certainly not jumping
> out at me. Pointers (especially to documentation I've missed *) would
> be appreciated.
>
> Skip Montanaro
>
> (*) Prefer doc links rather than StackOverflow links, though they will
> do in a pinch.
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