Added options to the source file when processing thumbnails

lib/paperclip/thumbnail.rb

@@ -2,7 +2,7 @@ module Paperclip
   # Handles thumbnailing images that are uploaded.
   class Thumbnail < Processor
 
-    attr_accessor :current_geometry, :target_geometry, :format, :whiny, :convert_options
+    attr_accessor :current_geometry, :target_geometry, :format, :whiny, :convert_options, :source_file_options
 
     # Creates a Thumbnail object set to work on the +file+ given. It
     # will attempt to transform the image into one defined by +target_geometry+
@@ -17,6 +17,7 @@ module Paperclip
       @crop                = geometry[-1,1] == '#'
       @target_geometry     = Geometry.parse geometry
       @current_geometry    = Geometry.from_file @file
+      @source_file_options = options[:source_file_options]
       @convert_options     = options[:convert_options]
       @whiny               = options[:whiny].nil? ? true : options[:whiny]
       @format              = options[:format]
@@ -43,6 +44,7 @@ module Paperclip
       dst.binmode
 
       command = <<-end_command
+        #{ source_file_options }
         "#{ File.expand_path(src.path) }[0]"
         #{ transformation_command }
         "#{ File.expand_path(dst.path) }"

test/thumbnail_test.rb

@@ -103,6 +103,44 @@ class ThumbnailTest < Test::Unit::TestCase
       end
     end
     
+    context "being thumbnailed with source file options set" do
+      setup do
+        @thumb = Paperclip::Thumbnail.new(@file,
+                                          :geometry            => "100x50#",
+                                          :source_file_options => "-strip")
+      end
+
+      should "have source_file_options value set" do
+        assert_equal "-strip", @thumb.source_file_options
+      end
+
+      should "send the right command to convert when sent #make" do
+        Paperclip.expects(:"`").with do |arg|
+          arg.match %r{convert\s+-strip\s+"#{File.expand_path(@thumb.file.path)}\[0\]"\s+-resize\s+"x50"\s+-crop\s+"100x50\+114\+0"\s+\+repage\s+".*?"}
+        end
+        @thumb.make
+      end
+
+      should "create the thumbnail when sent #make" do
+        dst = @thumb.make
+        assert_match /100x50/, `identify "#{dst.path}"`
+      end
+      
+      context "redefined to have bad source_file_options setting" do
+        setup do
+          @thumb = Paperclip::Thumbnail.new(@file,
+                                            :geometry => "100x50#",
+                                            :source_file_options => "-this-aint-no-option")
+        end
+
+        should "error when trying to create the thumbnail" do
+          assert_raises(Paperclip::PaperclipError) do
+            @thumb.make
+          end
+        end
+      end      
+    end
+
     context "being thumbnailed with convert options set" do
       setup do
         @thumb = Paperclip::Thumbnail.new(@file,