Merge pull request #121 from gvwilson/prev-next

{% comment %}

  Find previous and next episodes (if any).

{% endcomment %}

{% for episode in site.episodes  %}

  {% if episode.url == page.url %}

    {% unless forloop.first %}

      {% assign prev_episode = prev %}

    {% endunless %}

    {% unless forloop.last %}

      {% assign next_episode = site.episodes[forloop.index] %}

    {% endunless %}

  {% endif %}

  {% assign prev = episode %}

{% endfor %}

{% comment %}

  Display title and prev/next links.

  Navigation bar for an episode.

{% endcomment %}

<div class="row">

  <div class="col-md-1">

    <h3>

      {% if prev_episode %}

      <a href="{{ page.root }}{{ prev_episode.url }}"><span class="glyphicon glyphicon-menu-left" aria-hidden="true"></span><span class="sr-only">previous episode</span></a>

      {% if page.previous.url %}

      <a href="{{ page.root }}{{ page.previous.url }}"><span class="glyphicon glyphicon-menu-left" aria-hidden="true"></span><span class="sr-only">previous episode</span></a>

      {% else %}

      <a href="{{ page.root }}/"><span class="glyphicon glyphicon-menu-up" aria-hidden="true"></span><span class="sr-only">lesson home</span></a>

      {% endif %}

  </div>

  <div class="col-md-1">

    <h3>

      {% if next_episode %}

      <a href="{{ page.root }}{{ next_episode.url }}"><span class="glyphicon glyphicon-menu-right" aria-hidden="true"></span><span class="sr-only">next episode</span></a>

      {% if page.next.url %}

      <a href="{{ page.root }}{{ page.next.url }}"><span class="glyphicon glyphicon-menu-right" aria-hidden="true"></span><span class="sr-only">next episode</span></a>

      {% else %}

      <a href="{{ page.root }}/"><span class="glyphicon glyphicon-menu-up" aria-hidden="true"></span><span class="sr-only">lesson home</span></a>

      {% endif %}