Add extension to original file on reprocess

lib/paperclip/attachment.rb

@@ -314,7 +314,10 @@ module Paperclip
     # thumbnails forcefully, by reobtaining the original file and going through
     # the post-process again.
     def reprocess!
-      new_original = Tempfile.new("paperclip-reprocess-#{instance.class.table_name}-#{instance.id}-")
+      new_original = Tempfile.new([
+        "paperclip-reprocess-#{instance.class.table_name}-#{instance.id}-",
+        File.extname(instance_read(:file_name))
+      ])
       new_original.binmode
       old_original = to_file(:original) || raise("no original in store")
       # по идее копирование нужно не всегда

lib/paperclip/optimizer.rb

@@ -22,6 +22,7 @@ module Paperclip
       dst_shell = dst_file.path.shellescape
       cmd = case real_content_type
             when 'image/jpeg', 'image/jpg', 'image/pjpeg'
+              # TODO: --stdout > #{dst_shell}
               "cp #{src_shell} #{dst_shell} && jpegoptim --all-progressive -q --strip-com --strip-exif --strip-iptc -- #{dst_shell}"
             when 'image/png', 'image/x-png'
               "pngcrush -rem alla -q #{src_shell} #{dst_shell}"