import json
import yaml
from django.core.exceptions import ImproperlyConfigured
from django.shortcuts import render
from django.conf import settings

def yaml_to_html(request):
    if hasattr(settings, 'SWAGGER_YAML_FILE'):
        file = open(settings.SWAGGER_YAML_FILE)
        spec = yaml.load(file.read())
        return render(request, template_name="swagger_base.html", context={'data': json.dumps(spec)})
    else:
        raise ImproperlyConfigured('You should define SWAGGER_YAML_FILE in your settings')