From cf2609530fcffdc7f5477336232b7cfde8b6403f Mon Sep 17 00:00:00 2001
From: Andrew Manning <andrewmanning@grid.reticu.li>
Date: Thu, 24 Aug 2017 18:57:41 +0000
Subject: Added language selector menu for Help pages

---
 Zotlabs/Module/Help.php |  5 ++++-
 include/help.php        | 25 ++++++++++++++++++++++++-
 view/js/mod_help.js     | 50 +++++++++++++++++++++++++++++++++++++++++++++++++
 view/tpl/help.tpl       | 15 +++++++++++++++
 4 files changed, 93 insertions(+), 2 deletions(-)

diff --git a/Zotlabs/Module/Help.php b/Zotlabs/Module/Help.php
index e98cb9d4d..f3cc3aa5f 100644
--- a/Zotlabs/Module/Help.php
+++ b/Zotlabs/Module/Help.php
@@ -88,12 +88,15 @@ class Help extends \Zotlabs\Web\Controller {
 			$heading = $headings[argv(1)];
 
 		$content =  get_help_content();
+		
+		$language = determine_help_language()['language'];
 
 		return replace_macros(get_markup_template('help.tpl'), array(
 			'$title'      => t('$Projectname Documentation'),
 			'$tocHeading' => t('Contents'),
 			'$content'    => $content,
-			'$heading'    => $heading
+			'$heading'    => $heading,
+			'$language'   => $language
 		));
 	}
 
diff --git a/include/help.php b/include/help.php
index f38f77854..ef6b77e12 100644
--- a/include/help.php
+++ b/include/help.php
@@ -32,6 +32,13 @@ function get_help_content($tocpath = false) {
 		if(! $tocpath)
 			\App::$page['title'] = t('Help:') . ' ' . ucwords(str_replace('-',' ',notags($title)));
 
+		if($tocpath !== false && 
+			load_doc_file('doc/' . $path . '.md') === '' && 
+			load_doc_file('doc/' . $path . '.bb') === '' && 
+			load_doc_file('doc/' . $path . '.html') === '' 
+		  ) {
+			$path = 'toc';
+		}
 		$text = load_doc_file('doc/' . $path . '.md');
 
 		if(! $text) {
@@ -110,7 +117,10 @@ function preg_callback_help_include($matches) {
 function determine_help_language() {
 	require_once('Text/LanguageDetect.php');
 	$lang_detect = new Text_LanguageDetect();
+	// Set this mode to recognize language by the short code like "en", "ru", etc.
 	$lang_detect->setNameMode(2);
+	// If the language was specified in the URL, override the language preference 
+	// of the browser. Default to English if both of these are absent.
 	if($lang_detect->languageExists(argv(1))) {
 		$lang = argv(1);
 		$from_url = true;
@@ -125,13 +135,16 @@ function determine_help_language() {
 
 function load_doc_file($s) {
 	$path = 'doc';
+	// Determine the language and modify the path accordingly
 	$x = determine_help_language();
 	$lang = $x['language'];
 	$url_idx = ($x['from_url'] ? 1 : 0);
+	// The English translation is at the root of /doc/. Other languages are in 
+	// subfolders named by the language code such as "de", "es", etc.
 	if($lang !== 'en') {
 		$path .= '/' . $lang;	
 	}
-		
+
 	$b = basename($s);
 	
 	for($i=1+$url_idx; $i<argc()-1; $i++) {
@@ -140,6 +153,16 @@ function load_doc_file($s) {
 	$c = find_doc_file($path . '/' . $b);
 	if($c)
 		return $c;
+	// Possibly a translation was requested that has not been translated, so fall
+	// back to the English version
+	$path = 'doc';
+	for($i=1+$url_idx; $i<argc()-1; $i++) {
+		$path .= '/' . argv($i);
+	}
+	$c = find_doc_file($path . '/' . $b);
+	if($c)
+		return $c;
+	// Try one last time to find the file at the explicit path input to the function
 	$c = find_doc_file($s);
 	if($c)
 		return $c;
diff --git a/view/js/mod_help.js b/view/js/mod_help.js
index 0f85af462..257be67e6 100644
--- a/view/js/mod_help.js
+++ b/view/js/mod_help.js
@@ -71,4 +71,54 @@ $(document).ready(function () {
 		var newref = p.protocol + '//' + p.hostname + portstr + p.pathname + p.hash.split('?').shift();
 		location.replace(newref)
 	}
+
+	
+	// Determine language translations available from the language selector menu itself
+	var langChoices = [];
+	$('.lang-selector').find('.lang-choice').each(function (idx, a) {
+		langChoices.push($(a).html());
+	});
+	// Parse the URL and insert the language code for the loaded language, based
+	// on the variable "help_language" that is declared in the help.tpl page template
+	var path = window.location.pathname.split('/');
+	var pathParts = [];
+	var pick_me = true;
+	for (var i = 0; i < path.length; i++) {
+		if(i === 2 && pick_me ) {
+			if(path[i].length > 0) {
+				pathParts.push(help_language);
+				pick_me = false;
+				if($.inArray(path[i], langChoices) < 0) {
+					i--;	
+				}
+			}
+		} else {
+			if(path[i].length > 0) {
+				pathParts.push(path[i]);
+			}
+		}
+		
+	}
+	// Update the address bar to reflect the loaded language
+	window.history.pushState({}, '', '/' + pathParts.join('/'));
+	
+	// Highlight the language in the language selector that is currently viewed
+	$('.lang-selector').find('.lang-choice:contains("' + help_language + '")').css('font-weight','bold').css('background-color','lightgray');
+	
+	// Construct the links to the available translations based and populate the selector menu
+	$('.lang-selector').find('.lang-choice').each(function (idx, a) {
+		var langLink = [];
+
+		for (var i = 0; i < pathParts.length; i++) {
+			
+			if(i === 1) {
+				langLink.push($(a).html());
+			} else {
+				langLink.push(pathParts[i]);
+			}
+
+		}
+		$(a).attr('href', '/' + langLink.join('/'));
+	});
+	
 });
diff --git a/view/tpl/help.tpl b/view/tpl/help.tpl
index 31e5b9794..bdb25edf1 100644
--- a/view/tpl/help.tpl
+++ b/view/tpl/help.tpl
@@ -1,5 +1,17 @@
 <div id="help-content" class="generic-content-wrapper">
 	<div class="section-title-wrapper">
+		<div class="pull-right">
+			<div class="btn-group">
+				<button type="button" class="btn btn-outline-secondary btn-sm dropdown-toggle" data-toggle="dropdown">
+					<i class="fa fa-language" style="font-size: 1.4em;"></i><span class="caret"></span>
+				</button>
+				<div class="dropdown-menu dropdown-menu-right flex-column lang-selector">
+					<a class="dropdown-item lang-choice" href="/help">de</a>
+					<a class="dropdown-item lang-choice" href="/help">en</a>
+					<a class="dropdown-item lang-choice" href="/help">es</a>
+				</div>
+			</div>
+		</div>
 		<h2>{{$title}}: {{$heading}}</h2>
 	</div>
 	<div class="section-content-wrapper" id="doco-content">
@@ -13,3 +25,6 @@
 		{{$content}}
 	</div>
 </div>
+<script>
+	var help_language = '{{$language}}'
+</script>
-- 
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