move tempfile to own sourcefile

lib/paperclip.rb

@@ -32,6 +32,7 @@ require 'paperclip/upfile'
 require 'paperclip/iostream'
 require 'paperclip/geometry'
 require 'paperclip/processor'
+require 'paperclip/tempfile'
 require 'paperclip/thumbnail'
 require 'paperclip/recursive_thumbnail'
 require 'paperclip/storage'

lib/paperclip/processor.rb

@@ -33,17 +33,4 @@ module Paperclip
       new(file, options, attachment).make
     end
   end
-
-  # Due to how ImageMagick handles its image format conversion and how Tempfile
-  # handles its naming scheme, it is necessary to override how Tempfile makes
-  # its names so as to allow for file extensions. Idea taken from the comments
-  # on this blog post:
-  # http://marsorange.com/archives/of-mogrify-ruby-tempfile-dynamic-class-definitions
-  class Tempfile < ::Tempfile
-    # Replaces Tempfile's +make_tmpname+ with one that honors file extensions.
-    def make_tmpname(basename, n)
-      extension = File.extname(basename)
-      sprintf("%s,%d,%d%s", File.basename(basename, extension), $$, n.to_i, extension)
-    end
-  end
 end

lib/paperclip/tempfile.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'English'
+
+module Paperclip
+  # Due to how ImageMagick handles its image format conversion and how Tempfile
+  # handles its naming scheme, it is necessary to override how Tempfile makes
+  # its names so as to allow for file extensions. Idea taken from the comments
+  # on this blog post:
+  # http://marsorange.com/archives/of-mogrify-ruby-tempfile-dynamic-class-definitions
+  class Tempfile < ::Tempfile
+    # это похоже актуально только для java (не проверял, в mri 3.2 точно не вызывается)
+
+    # Replaces Tempfile's +make_tmpname+ with one that honors file extensions.
+    def make_tmpname(basename, n)
+      extension = File.extname(basename)
+      sprintf("%s,%d,%d%s", File.basename(basename, extension), $PROCESS_ID, n.to_i, extension)
+    end
+  end
+end