feature(discussions): More compact listing of lastest discussions

Removes several features to make the listing cleaner/more compact:

 * All the actions/controls (like, mark-as-spam, remove-ad, etc.)
 * The preview text (people need to write better titles anyways)
 * Which group it was posted in (usually don't care)

Refs #18

start.php

@@ -192,4 +192,11 @@ function community_theme_pagesetup() {
 
 	$actions = __DIR__ . "/actions";
 	elgg_register_action('admin/flush_apc', "$actions/admin/flush_apc.php", 'admin');
+
+	elgg_register_plugin_hook_handler('route', 'discussion', function($hook, $type, $result, $params) {
+		if (!isset($params['segments'][0])) {
+			echo elgg_view_resource('discussion/index');
+			return false;
+		}
+	});
 });

views/default/resources/discussion/index.css

@@ -0,0 +1,64 @@
+.actions {
+	align-items: center;
+	display: flex;
+	flex-direction: row;
+	white-space: nowrap;
+}
+
+.header {
+	display: flex;
+	flex-direction: row;
+	padding: 0 12px;
+}
+
+.listItem {
+	align-items: center;
+	display: flex;
+	flex-direction: row;
+	padding-left: 12px;
+}
+
+.listItem:not(:last-child) {
+	border-bottom: 1px solid #ccc;
+}
+
+.listItem--unread {
+	font-weight: bold;
+}
+
+.listItem-author {
+	display: block;
+
+	/* If we don't set this explicit, the div grows to be 46px???? */
+	height: 40px;
+}
+
+.listItem-body {
+	flex: 100%;
+
+}
+
+.listItem-metadata {
+	padding: 0 12px 8px;
+}
+
+.listItem-title {
+	display: block;
+	font-size: larger;
+	padding: 8px 12px;
+}
+
+.pagination {
+	display: flex;
+	padding: 8px 12px;
+}
+
+.pagination > * {
+	flex: 1;
+	text-align: center;
+}
+
+.title {
+	flex: 100%;
+	padding: .5em 0;
+}

views/default/resources/discussion/index.php

@@ -0,0 +1,137 @@
+<?php
+
+$offset = get_input('offset', 0);
+$limit = max(50, elgg_get_config('default_limit'));
+
+$recentlyActive = elgg_get_entities([
+	'type' => 'object',
+	'subtype' => 'discussion',
+	'order_by' => 'e.last_action desc',
+	'limit' => $limit,
+	'offset' => $offset,
+	'preload_owners' => true,
+	'preload_containers' => true,
+]);
+
+$discussions = (object)[
+	'length' => elgg_get_entities([
+		'type' => 'object',
+		'subtype' => 'discussion',
+		'count' => true,
+	]),
+	'fields' => (object)[
+		'title' => (object)['label' => 'Title'],
+		'replies_length' => (object)['label' => 'Replies'],
+		'last_action' => (object)['label' => 'Last activity'],
+	],
+	'recently_active' => (object)[
+		'label' => 'Latest discussion',
+		'next' => 'Older &raquo;',
+		'prev' => '&laquo; Newer',
+		'actions' => [
+			(object)[
+				'icon' => (object)[
+					'16x16' => '',
+				],
+				'label' => 'Start new discussion',
+				'href' => elgg_get_site_url() . 'discussion/new',
+			],
+		],
+		'items' => array_map(function($discussion) {
+			$owner = $discussion->getOwnerEntity();
+
+			return (object)[
+				'author' => (object)[
+					'name' => $owner->name,
+					'url' => $owner->getUrl(),
+					'avatar' => (object)[
+						'preview' => (new ElggUser())->getIconUrl('small'),
+						'40x40' => $owner->getIconUrl('small'),
+						'100x100' => $owner->getIconUrl('medium'),
+					],
+				],
+				'is_unread' => false,
+				'last_action' => $discussion->last_action,
+				'title' => $discussion->title,
+				'url' => $discussion->getUrl(),
+				'replies_length' => elgg_get_entities(array(
+					'type' => 'object',
+					'subtype' => 'discussion_reply',
+					'container_guid' => $discussion->getGUID(),
+					'count' => true,
+					'distinct' => false,
+				)),
+			];
+		}, $recentlyActive),
+	],
+];
+
+
+elgg_register_css('resources/discussion/index', elgg_get_simplecache_url('resources/discussion/index.css'));
+elgg_load_css('resources/discussion/index');
+?>
+
+<?php ob_start(); ?>
+<main>
+	<header class="header">
+		<h1 class="title">
+			<?=$discussions->recently_active->label; ?>
+		</h1>
+		<ul class="actions">
+			<?php foreach ($discussions->recently_active->actions as $action): ?>
+			<li>
+				<a href="<?=$action->href?>" class="elgg-button elgg-button-special">
+					<?=$action->label;?>
+				</a>
+			</li>
+			<?php endforeach; ?>
+		</ul>
+	</header>
+	<ol class="list">
+		<?php foreach ($discussions->recently_active->items as $discussion): ?>
+		<li class="listItem <?=$discussion->is_unread ? 'listItem--unread' : ''?>">
+			<div class="listItem-author">
+				<?php $avatar = $discussion->author->avatar; ?>
+				<img src="<?=$avatar->preview?>" width="40" height="40"
+				     srcset="<?=$avatar->{'40x40'}?> 1x, <?=$avatar->{'100x100'}?> 2.5x"
+				     alt="<?=$discussion->author->name?>">
+			</div>
+			<div class="listItem-body">
+				<a class="listItem-title"
+				   href="<?=$discussion->url;?>">
+					<?=$discussion->title;?>
+				</a>
+				<div class="listItem-metadata">
+					<a href="<?=$discussion->author->url?>">
+						<?=$discussion->author->name?>
+					</a>
+					&middot;
+					<?=elgg_view('output/friendlytime', ['time' => $discussion->last_action]);?>
+					&middot;
+					<?=$discussion->replies_length . ' ' . elgg_echo('discussion:replies')?>
+				</div>
+			</div>
+		</li>
+		<?php endforeach; ?>
+	</ol>
+	<nav class="pagination">
+		<?php if ($offset > 0): ?>
+		<a href="?offset=<?=max(0, $offset - $limit)?>" rel="prev"
+		   class="elgg-button elgg-button-action">
+			<?=$discussions->recently_active->prev?>
+		</a>
+		<?php endif; ?>
+
+		<?php if ($offset + $limit < $discussions->length): ?>
+		<a href="?offset=<?=$limit+$offset?>" rel="next"
+		   class="elgg-button elgg-button-action">
+			<?=$discussions->recently_active->next?>
+		</a>
+		<?php endif; ?>
+	</nav>
+</main>
+<?php $body = ob_get_clean(); ?>
+
+<?php
+
+echo elgg_view_page($title, $body);