Initial commit (...)

SubjectsBrowsePlugin.php

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+<?php 
+class SubjectsBrowsePlugin extends Omeka_Plugin_AbstractPlugin
+{
+	protected $_hooks = array('define_routes');
+
+	public function hookDefineRoutes($args)
+	{
+		if (is_admin_theme()) {
+			return;
+		}
+
+		$router = $args['router'];
+		$subjectsRoute = new Zend_Controller_Router_Route(
+			'items/subjects',
+			array(
+				'module' => 'subjects-browse',
+				'controller' => 'items',
+				'action' => 'browse',
+			)
+		);
+		$router->addRoute('subjects_browse', $subjectsRoute);
+	}
+}

plugin.ini

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+[info]
+name="Subjects Browse"
+author="Erin Bell"
+description="Adds a list of linked Subject terms to items/subjects"
+license="GPLv3"
+link="https://erinbell.org/"
+support_link="https://erinbell.org/"
+omeka_minimum_version="3.0"
+omeka_target_version="3.0.2"
+version="1.0"

views/public/items/browse.php

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+<?php
+	require_once 'functions.php'; 
+	$subjects = sb_get_subjects();
+	if(isset($_GET["sort_field"]) && $_GET["sort_field"] == 'name' && isset($_GET["sort_dir"]) && $_GET["sort_dir"] == 'd'){
+		arsort($subjects); // z-a
+	}elseif(isset($_GET["sort_field"]) && $_GET["sort_field"] == 'count' && isset($_GET["sort_dir"]) && $_GET["sort_dir"] == 'a'){
+		usort($subjects, 'sb_ascend'); // least
+	}elseif(isset($_GET["sort_field"]) && $_GET["sort_field"] == 'count' && isset($_GET["sort_dir"]) && $_GET["sort_dir"] == 'd'){
+		usort($subjects, 'sb_descend'); // most
+	}elseif(isset($_GET["sort_field"]) && $_GET["sort_field"] == 'count'){
+		usort($subjects, 'sb_ascend'); // least (if no sort_dir is specified)
+	}else{
+		asort($subjects); // a-z
+	}
+	$total = count($subjects);
+	echo head(array('maptype'=>'none', 'title'=>__('Browse by Subject'),'bodyid'=>'items','bodyclass'=>'browse subjects'));
+?>
+<!-- The following markup is for the Curatescape Echo theme. -->
+<!-- If using another theme, you'll need to create a custom template at yourtheme/subjects-browse/items/browse.php -->
+<div id="content" role="main">
+	<article class="browse subjects">
+		<div class="browse-header">
+			<h2 class="query-header"><?php echo __('Subjects: %s', $total);?></h2>
+			<nav class="secondary-nav" id="subject-browse">
+				<?php echo function_exists('rl_item_browse_subnav') ? rl_item_browse_subnav() : null; ?>
+			</nav>
+			<div id="helper-links">
+				<span class="helper-label"><?php echo function_exists('rl_icon') ? rl_icon('funnel').'&nbsp;'.__("Sort by: ") : null; ?>
+				</span>
+				<?php echo browse_sort_links(array('Name'=>'name','Count'=>'count')); ?>
+			</div>
+		</div>
+		<div id="primary" class="">
+			<section id="subjects" aria-label="<?php echo __('Subjects');?>">
+				<?php 
+				if($total > 0){
+					sb_subjects_list($subjects);
+				}else{
+					echo '<p>'.__('No subjects are available.').'</p>';
+				}
+				?>
+			</section>
+		</div>
+	</article>
+</div>
+<?php echo foot(); ?>

views/public/items/functions.php

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+<?php
+function sb_get_subjects(){
+	$subjects = [];
+	if($records = get_records('ElementText',array('element_id'=>'49'),'all')){
+		foreach($records as $r){
+			$TEXT=trim($r->text);
+			$subjects[] = array(
+				'text' => $TEXT,
+				'letter' => strtolower(substr($r->text, 0, 1)),
+				'count' => count(array_filter($records, function ($element) use($TEXT){ 
+					return $element['text'] == $TEXT; 
+				})), // @todo
+			);
+		}
+		$subjects = array_unique($subjects, SORT_REGULAR); // unique
+	}
+	return $subjects;
+}
+
+function sb_subjects_list($subjects){
+	if($subjects){
+		echo '<ul>';
+		foreach($subjects as $subject){
+			$link = WEB_ROOT;
+			$link .= htmlentities('/items/browse?term=');
+			$link .= rawurlencode($subject['text']);
+			$link .= htmlentities('&search=&advanced[0][element_id]=49&advanced[0][type]=contains&advanced[0][terms]=');
+			$link .= urlencode(str_replace('&amp;', '&', $subject['text']));
+			echo '<li data-letter="'.$subject['letter'].'" data-count="'.$subject['count'].'"><a href="'.$link.'">'.$subject['text'].' <span class="count">'.$subject['count'].'</span></a></li>';
+		}
+		echo '</ul>';
+	}
+}
+
+function sb_ascend($a, $b){
+	return $a['count'] - $b['count'];
+}
+function sb_descend($a, $b){
+	return $b['count'] - $a['count'];
+}