wip

src/FormatTalksBundle/DependencyInjection/SculpinFormatTalksExtension.php

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+<?php
+
+namespace FormatTalksBundle\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpKernel\DependencyInjection\Extension;
+use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
+use Symfony\Component\Config\FileLocator;
+
+class SculpinFormatTalksExtension extends Extension
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function load(array $configs, ContainerBuilder $container)
+    {
+        $loader = new YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
+        $loader->load('services.yml');
+    }
+}

src/FormatTalksBundle/Resources/config/services.yml

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+services:
+    twig.format_talks:
+        class: 'FormatTalksBundle\TwigExtension\FormatTalksExtension'
+        tags:
+            - { name: twig.extension }

src/FormatTalksBundle/SculpinFormatTalksBundle.php

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+<?php
+
+namespace FormatTalksBundle;
+
+use Symfony\Component\HttpKernel\Bundle\Bundle;
+
+class SculpinFormatTalksBundle extends Bundle
+{
+}

src/FormatTalksBundle/TwigExtension/FormatTalksExtension.php

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+<?php
+
+namespace FormatTalksBundle\TwigExtension;
+
+use Illuminate\Support\Collection;
+use Sculpin\Contrib\ProxySourceCollection\ProxySourceCollection;
+use Twig_Extension;
+use Twig_SimpleFunction;
+
+class FormatTalksExtension extends Twig_Extension
+{
+    /**
+     * @var string The current date.
+     */
+    private $today;
+
+    public function __construct()
+    {
+        $this->today = (new \DateTime())->format('Y-m-d');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFunctions()
+    {
+        return [
+            new Twig_SimpleFunction('getAllTalks', [$this, 'getAll']),
+            new Twig_SimpleFunction('getUpcomingTalks', [$this, 'getUpcoming']),
+            new Twig_SimpleFunction('getPastTalks', [$this, 'getPast']),
+        ];
+    }
+
+  /**
+   * Get all upcoming and previous talks.
+   *
+   * @param ProxySourceCollection|array $talks All talk nodes.
+   * @param array $eventData Shared event data.
+   *
+   * @return Collection A sorted collection of talks.
+   */
+    public function getAll($talks, array $eventData = [])
+    {
+        return $this->format($talks, $eventData)->sortBy('event.date');
+    }
+
+  /**
+   * Get all upcoming talks.
+   *
+   * @param ProxySourceCollection|array $talks All talk nodes.
+   * @param array $eventData Shared event data.
+   *
+   * @return Collection A sorted collection of talks.
+   */
+    public function getUpcoming($talks, array $eventData = [])
+    {
+        return $this->format($talks, $eventData)
+            ->filter(function ($talk) {
+                return $talk['event']['date'] >= $this->today;
+            })
+            ->sortBy('event.date');
+    }
+
+    /**
+     * Get all past talks.
+     *
+     * @param ProxySourceCollection|array $talks All talk nodes.
+     * @param array $eventData Shared event data.
+     *
+     * @return Collection A sorted collection of talks.
+     */
+    public function getPast($talks, array $eventData = [])
+    {
+        return $this->format($talks, $eventData)
+            ->filter(function ($talk) {
+                return $talk['event']['date'] < $this->today;
+            })
+            ->sortByDesc('event.date');
+    }
+
+  /**
+   * Format the talk data into the required format.
+   *
+   * @param ProxySourceCollection|array $talks All talk nodes.
+   * @param array $eventData Shared event data.
+   *
+   * @return Collection The combined event and talk data.
+   */
+    public function format($talks, array $eventData)
+    {
+        $eventData = collect($eventData);
+
+        return collect($talks)->flatMap(function ($talk) use ($eventData) {
+            // Build an associative array with the talk, as well as the
+            // specified event data (e.g. date and time) as well as the shared
+            // event data (e.g. event name and website).
+            return collect($talk['events'])
+                ->map(function ($event) use ($talk, $eventData) {
+                    $event = collect($event);
+                    $event = $event->merge($eventData->get($event->get('event')))->all();
+
+                    return compact('event', 'talk');
+                });
+        });
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'format_talks';
+    }
+}

src/FormatTalksBundle/composer.json

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+{
+    "require": {
+        "tightenco/collect": "^5.4"
+    }
+}

src/helpers.php

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+<?php
+
+function tap($value, $callback)
+{
+    $callback($value);
+
+    return $value;
+}