replaced Open3 with IO.popen

lib/wisepdf/configuration.rb

@@ -39,6 +39,11 @@ def test?
           (defined?(RAILS_ENV) && RAILS_ENV == 'test')
       end
 
+      def production?
+        (defined?(::Rails) && ::Rails.env == 'production') ||
+          (defined?(RAILS_ENV) && RAILS_ENV == 'production')
+      end
+
       def windows?
         RbConfig::CONFIG['target_os'] == 'mingw32'
       end

lib/wisepdf/writer.rb

@@ -9,13 +9,12 @@ def initialize(wkhtmltopdf = nil, options = {})
 
     def to_pdf(string, options={})
       invoke = self.command(options).join(' ')
-      self.log(invoke) if Wisepdf::Configuration.development? || Wisepdf::Configuration.test?
+      self.log(invoke) unless Wisepdf::Configuration.production?
 
-      result, err = Open3.popen3(invoke) do |stdin, stdout, stderr|
-        stdin.binmode
-        stdin.write(string)
-        stdin.close
-        [stdout.read, stderr.read]
+      result = IO.popen(invoke, "wb+") do |pdf|
+        pdf.puts(string)
+        pdf.close_write
+        pdf.gets(nil)
       end
 
       raise Wisepdf::WriteError if result.to_s.strip.empty?