Merge pull request #27 from bjgordon/master

Fixed so PATH modification doesnt error on windows

Author: jonmagic

lib/grim/image_magick_processor.rb

@@ -1,3 +1,5 @@
+require 'open3'
+
 module Grim
   class ImageMagickProcessor
 
@@ -40,11 +42,15 @@ def save(pdf, index, path, options)
       command << "#{Shellwords.shellescape(pdf.path)}[#{index}]"
       command << path
 
-      command.unshift("PATH=#{File.dirname(@ghostscript_path)}:#{ENV['PATH']}") if @ghostscript_path && @ghostscript_path != DefaultGhostScriptPath
+      command_env = {}
 
-      result = `#{command.join(' ')}`
+      if @ghostscript_path && @ghostscript_path != DefaultGhostScriptPath
+        command_env['PATH'] = "#{File.dirname(@ghostscript_path)}#{File::PATH_SEPARATOR}#{ENV['PATH']}"
+      end
+
+      result, status = Open3.capture2e(command_env, command.join(' '))
 
-      $? == 0 || raise(UnprocessablePage, result)
+      status.success? || raise(UnprocessablePage, result)
     end
   end
 end