Add theme-specific classes to body tag

Closes #193.

qa-include/qa-theme-base.php

@@ -51,6 +51,8 @@ class qa_html_theme_base
 
 	// whether to use new block layout in rankings (true) or fall back to tables (false)
 	protected $ranking_block_layout = false;
+	// theme 'slug' to use as CSS class
+	protected $theme;
 
 
 	public function __construct($template, $content, $rooturl, $request)
@@ -406,6 +408,7 @@ class qa_html_theme_base
 	public function body_tags()
 	{
 		$class = 'qa-template-'.qa_html($this->template);
+		$class .= empty($this->theme) ? '' : ' qa-theme-' . qa_html($this->theme);
 
 		if (isset($this->content['categoryids'])) {
 			foreach ($this->content['categoryids'] as $categoryid)

qa-theme/Candy/qa-theme.php

@@ -24,6 +24,7 @@ class qa_html_theme extends qa_html_theme_base
 {
 	// use new ranking layout
 	protected $ranking_block_layout = true;
+	protected $theme = 'candy';
 
 	public function nav_user_search() // reverse the usual order
 	{

qa-theme/Classic/qa-theme.php

@@ -24,4 +24,5 @@ class qa_html_theme extends qa_html_theme_base
 {
 	// use new ranking layout
 	protected $ranking_block_layout = true;
+	protected $theme = 'classic';
 }

qa-theme/Snow/qa-theme.php

@@ -4,6 +4,7 @@ class qa_html_theme extends qa_html_theme_base
 {
 	// use new ranking layout
 	protected $ranking_block_layout = true;
+	protected $theme = 'snow';
 
 	// outputs login form if user not logged in
 	public function nav_user_search()

qa-theme/SnowFlat/qa-theme.php

@@ -34,6 +34,8 @@
  */
 class qa_html_theme extends qa_html_theme_base
 {
+	protected $theme = 'snowflat';
+
 	// theme subdirectories
 	private $js_dir = 'js';
 	private $icon_url = 'images/icons';
@@ -114,6 +116,7 @@ class qa_html_theme extends qa_html_theme_base
 	public function body_tags()
 	{
 		$class = 'qa-template-' . qa_html($this->template);
+		$class .= empty($this->theme) ? '' : ' qa-theme-' . qa_html($this->theme);
 
 		if (isset($this->content['categoryids'])) {
 			foreach ($this->content['categoryids'] as $categoryid)