Implemented option to show only available language translations links

admin/qtx_configuration.php

@@ -369,6 +369,9 @@ function qtranxf_conf() {
 					<br/>
 					<label for="show_alternative_content"><input type="checkbox" name="show_alternative_content" id="show_alternative_content" value="1"<?php checked($q_config['show_alternative_content']) ?>/> <?php _e('Show content in an alternative language when translation is not available for the selected language.', 'qtranslate') ?></label>
 					<p class="qtranxs_notes"><?php echo __('If this option is on, then the content of the first available language will also be shown, instead of the expected language, for the sake of user convenience.', 'qtranslate') ?></p>
+					<br/>
+					<label for="show_only_available_translations"><input type="checkbox" name="show_only_available_translations" id="show_only_available_translations" value="1"<?php checked($q_config['show_only_available_translations']) ?>/> <?php _e('Show links to available language translations only.', 'qtranslate') ?></label>
+					<p class="qtranxs_notes"><?php echo __('Posts or pages with available translations are only shown.', 'qtranslate') ?></p>
 				</td>
 			</tr>
 			<tr valign="top">

qtranslate_frontend.php

@@ -281,7 +281,7 @@ function qtranxf_add_language_menu_item(&$items, &$menu_order, &$itemid, $key, $
 		unset($items[$k]);
 	}
 
-	foreach($q_config['enabled_languages'] as $lang)
+	foreach(qtranxf_getPageAvailableLanguages() as $lang)
 	{
 		if($type=='AL'){
 			if($lang==$language) continue;

qtranslate_options.php

@@ -75,6 +75,7 @@ function qtranxf_set_default_options(&$ops){
 		'show_displayed_language_prefix' => true,
 		'show_alternative_content_message' => true,
 		'show_alternative_content' => false,
+		'show_only_available_translations' => false,
 		'hide_default_language' => true,// hide language tag for default language in urls
 		'use_secure_cookie' => false,
 		'header_css_on' => true,

qtranslate_utils.php

@@ -960,3 +960,34 @@ function qtranxf_convert_strftime2date($format) {
 	return $format;
 }
 }// END DATE TIME FUNCTIONS
+
+function qtranxf_getPageAvailableLanguages(){
+	global $q_config;
+	$sortedLanguages = qtranxf_getSortedLanguages();
+	if (!empty($q_config['show_only_available_translations']) && $q_config['show_only_available_translations']) {
+		$postId = get_queried_object_id();
+		$pageLanguages = get_metadata('post', $postId, 'availablePageLanguages', true);
+		$availablePageLanguages = [];
+
+		if (empty($pageLanguages) || $pageLanguages === false) {
+			return $sortedLanguages;
+		}
+
+		foreach ($sortedLanguages as $language) {
+			if (in_array($language, $pageLanguages))
+				$availablePageLanguages[] = $language;
+		}
+		return $availablePageLanguages;
+	}
+	return $sortedLanguages;
+}
+function qtranxf_setPageAvailableLanguages($newStatus, $oldStatus, $post) {
+	$translatedLanguages = qtranxf_getAvailableLanguages($post->post_content);
+	if ($newStatus == 'publish') {
+		update_post_meta($post->ID, 'availablePageLanguages', $translatedLanguages);
+	}
+	else if ($newStatus == 'trash') {
+		delete_post_meta($post->ID, 'availablePageLanguages', $translatedLanguages);
+	}
+}
+add_action('transition_post_status', 'qtranxf_setPageAvailableLanguages', 10, 3);

qtranslate_widget.php

@@ -53,7 +53,7 @@ function widget($args, $instance) {
 			$title=apply_filters('qtranslate_widget_title',$title,$this);
 			echo $before_title . $title . $after_title;
 		}
-		qtranxf_generateLanguageSelectCode($instance,$this->id);
+		qtranxf_getPageAvailableLanguages($instance,$this->id);
 		echo $after_widget;
 	}
 
@@ -162,7 +162,7 @@ function qtranxf_generateLanguageSelectCode($args = array(), $id='') {
 		case 'text':
 		case 'css_only':
 		case 'dropdown': {
-			foreach(qtranxf_getSortedLanguages() as $language) {
+			foreach(qtranxf_getPageAvailableLanguages() as $language) {
 				$alt = $q_config['language_name'][$language].' ('.$language.')';
 				$classes = array('lang-'.$language);
 				if($language == $q_config['language']) $classes[] = 'active';