Directive: extend

Jael supports template inheritance by means of extend and block.

Note the following example:

<!-- layout.jl -->
<html>
    <head>
        <title>{{ title }} - My App</title>
    </head>
    <body>
        <block name="content"></block>
        <div class="footer">
          <!-- Footer content... -->
        </div>
    </body>
</html>

<!-- hello.jl -->
<extend src="layout.jl">
  <block name="content">
    <img src=user.avatar ?? "http://example.com/img/default-avatar">
    Hello, {{ user.name }}!
  </block>
</extend>

To extend a layout, instead of the file containing an <html> node, create a file with an <extend> node. The src attribute should point to the correct file. Then, add <block> tags that will replace the corresponding <block> tags declared in the parent file.

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