style fixes

lib/tasks/images.rake

@@ -1,6 +1,16 @@
 require 'danbooru_image_resizer/danbooru_image_resizer'
 
 namespace :images do
+  desc "Generate thumbnail-sized images of posts"
+  task :generate_preview => :environment do
+    Post.where("image_width > ?", Danbooru.config.small_image_width).find_each do |post|
+      if post.is_image?
+        puts "resizing preview #{post.id}"
+        Danbooru.resize(post.file_path, post.preview_file_path, Danbooru.config.small_image_width, Danbooru.config.small_image_width, 80)
+      end
+    end
+  end
+  
   desc "Generate medium-sized images of posts"
   task :generate_medium => :environment do
     Post.where("image_width > ?", Danbooru.config.medium_image_width).find_each do |post|