added delete all posts button

wired up the ability to enable all themes

app/models/post.rb

@@ -319,11 +319,11 @@ class Post < ActiveRecord::Base
       Post.transaction do
         self.last_version_at = revised_at
         updater.call(true)
-        EditRateLimiter.new(updated_by).performed!
+        EditRateLimiter.new(updated_by).performed! unless opts[:bypass_rate_limiter]
 
         # If a new version is created of the last post, bump it.
         unless Post.where('post_number > ? and topic_id = ?', self.post_number, self.topic_id).exists?
-          topic.update_column(:bumped_at, Time.now)
+          topic.update_column(:bumped_at, Time.now) unless opts[:bypass_bump]
         end
       end
 

app/models/site_customization.rb

@@ -1,5 +1,6 @@
 class SiteCustomization < ActiveRecord::Base
   
+  ENABLED_KEY = '7e202ef2-56d7-47d5-98d8-a9c8d15e57dd'
   CACHE_PATH = 'stylesheet-cache'
   @lock = Mutex.new 
 
@@ -49,18 +50,36 @@ footer:after{ content: '#{error}' }"
     self.remove_from_cache!
   end
 
+  def self.enabled_style
+    @cache ||= {}
+    preview_style = @cache[ENABLED_KEY]
+    return nil if preview_style == :none
+    return preview_style if preview_style
+
+    @lock.synchronize do 
+      style = self.where(enabled: true).first
+      if style
+        @cache[ENABLED_KEY] = style.key
+      else
+        @cache[ENABLED_KEY] = :none
+      end
+    end
+  end
 
   def self.custom_stylesheet(preview_style)
+    preview_style ||= enabled_style
     style = lookup_style(preview_style)
     style.stylesheet_link_tag.html_safe if style
   end
 
   def self.custom_header(preview_style)
+    preview_style ||= enabled_style
     style = lookup_style(preview_style)
     style.header.html_safe if style
   end
 
   def self.override_default_style(preview_style)
+    preview_style ||= enabled_style
     style = lookup_style(preview_style)
     style.override_default_style if style
   end
@@ -103,6 +122,7 @@ footer:after{ content: '#{error}' }"
   end
 
   def remove_from_cache!
+    self.class.remove_from_cache!(ENABLED_KEY)
     self.class.remove_from_cache!(self.key)
   end
 

app/models/user.rb

@@ -335,6 +335,18 @@ class User < ActiveRecord::Base
     PrettyText.excerpt(bio_cooked, 350)
   end
 
+  def delete_all_posts!(guardian)
+    raise Discourse::InvalidAccess unless guardian.can_delete_all_posts? self
+    
+    posts.order("post_number desc").each do |p|
+      if p.post_number == 1
+        p.topic.destroy
+      else
+        p.destroy
+      end
+    end
+  end
+
   def is_banned?
     !banned_till.nil? && banned_till > DateTime.now
   end