///|
fn main {
  let head =
    #|
    #|
    #|
    #|{{ title }} - {{ site_name }}
    #|
{{ site_name }}

    #|{% include "nav" %}

  let nav =
    #|
  let footer =
    #|
© 2026 {{ site_name }}

    #|
  let post_body =
    #|{% include "head" %}
    #|
{{ title }}

    #|
    #|{% if draft %}
draft
{% endif %}
    #|
{{ body | safe }}

    #|

    #|{% include "footer" %}
  let archive_body =
    #|{% include "head" %}
    #|
Posts

    #|{% for post in posts %}
    #|{% if not post.draft %}
    #|  
{{ post.title }}

    #|  
    #|  
{{ post.summary }}

    #|  

    #|{% endif %}
    #|{% endfor %}
    #|{% include "footer" %}

  let engine = @mold.Engine::new()
    .with_autoescape(true)
    .with_loader(fn(name) {
      match name {
        "head" => Some(head)
        "nav" => Some(nav)
        "footer" => Some(footer)
        "post" => Some(post_body)
        "archive" => Some(archive_body)
        _ => None
      }
    })

  let posts = @mold.array([
    @mold.object({
      "title": @mold.string("Hello, mold"),
      "date": @mold.string("2026-05-28"),
      "draft": @mold.bool(false),
      "body": @mold.string("
Hello world
"),
      "summary": @mold.string("First post."),
    }),
    @mold.object({
      "title": @mold.string("template composition"),
      "date": @mold.string("2026-05-27"),
      "draft": @mold.bool(false),
      "body": @mold.string("
Compose
"),
      "summary": @mold.string("How to compose."),
    }),
    @mold.object({
      "title": @mold.string("Draft"),
      "date": @mold.string("2026-05-29"),
      "draft": @mold.bool(true),
      "body": @mold.string("
Hidden
"),
      "summary": @mold.string("Draft."),
    }),
  ])

  let output = try {
    let post_tpl = engine.parse("{% include \"post\" %}")
    let archive_tpl = engine.parse("{% include \"archive\" %}")

    let builder = StringBuilder::new(size_hint=3000)

    builder.write_string(
      post_tpl.render(
        @mold.object({
          "site_name": @mold.string("My Site"),
          "title": @mold.string("Hello, mold"),
          "date": @mold.string("2026-05-28"),
          "draft": @mold.bool(false),
          "body": @mold.string("
Hello world
"),
        }),
      ),
    )

    builder.write_string("\n")

    builder.write_string(
      archive_tpl.render(
        @mold.object({
          "site_name": @mold.string("My Site"),
          "title": @mold.string("Posts"),
          "posts": posts,
        }),
      ),
    )

    builder.to_string()
  } catch {
    _ => "render failed"
  }
  println(output)
}