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<article class="post">
    <header class="post-header">
        <h1><a href="{{url}}" title="[Permalink] {{title}}">{{title}}</a></h1>
        <span class="date">{{date}}</span>
    </header>
    <section class="post-content">
        {{content}}
    </section>
    <p class="continue-reading"><a href="{{url}}">Continue reading &raquo;</a></p>
</article>

int TriboCrustacheGetVariable(crustache_var *variable, void *context, const char *key, size_t keySize) {
    printf("Get variable: %s.\n", strndup(key, keySize));
    variable->type = CRUSTACHE_VAR_STR;
    variable->data = (void *)"TEST VAR";
    variable->size = sizeof("TEST VAR");
    return 0;
}

crustache_template *pageTemplate;
crustache_new(&pageTemplate, &api, buffer, length);

struct buf *outputBuffer = bufnew(128);
crustache_var context = {
    .type = CRUSTACHE_VAR_CONTEXT
};
int error = crustache_render(outputBuffer, pageTemplate, &context);
if (error) {
    printf("Render error: %s\n", crustache_strerror(error));
}

printf("\nOutput data:\n%s\n", outputBuffer->data);
bufrelease(outputBuffer);

Get variable: url.
Get variable: title.
Get variable: title.
Get variable: date.
Get variable: content.
Get variable: url.

Output data:

<article class="post">
    <header class="post-header">
        <h1><a href="TEST VAR