raise exception if variable is not defined in context for a template #307
Description
say this is my template file:
<html>
<head>
<title>Our admins and users</title>
</head>
{# This is a short example to give you a quick overview of pongo2's syntax. #}
{% macro user_details(user, is_admin=false) %}
<div class="user_item">
<!-- Let's indicate a user's good karma -->
<h2 {% if (user.karma>= 40) || (user.karma > calc_avg_karma(userlist)+5) %} class="karma-good"{% endif %}>
<!-- This will call user.String() automatically if available: -->
{{ user }}
</h2>
<!-- Will print a human-readable time duration like "3 weeks ago" -->
<p>This user registered {{ user.register_date }}.</p>
<!-- Let's allow the users to write down their biography using markdown;
we will only show the first 15 words as a preview -->
<p>The user's biography:</p>
<p>
{{ user.biography }}
<a href="/user/{{ user.id }}/">read more</a>
</p>
{% if is_admin %}
<p>This user is an admin!</p>
{% endif %}
</div>
{% endmacro %}
<body>
<!-- Make use of the macro defined above to avoid repetitive HTML code
since we want to use the same code for admins AND members -->
<h1>Our admins</h1>
{% for admin in adminlist %} {{ user_details(admin, true) }} {% endfor %}
<h1>Our members</h1>
{% for user in userlist %} {{ user_details(user) }} {% endfor %}
</body>
</html>
and in this simple code I want to render the template
tpl, err := pongo2.FromFile("sample.tpl")
if err != nil {
log.Fatal(err)
}
ctx := pongo2.Context{}
In a way I want to get an error if the defined context does not match the variables in the template or get used variable names in the template. How can I do this?