Add title attr_accessor on Jobs

The title is how print jobs are listed as in the print queue.  This allows setting it
to something useful for identifying jobs in case they need to be
paused/canceled

ext/cups.c

@@ -109,20 +109,22 @@ static VALUE cups_print(VALUE self)
 {
  int job_id;
  VALUE file = rb_iv_get(self, "@filename");
+ VALUE rname = rb_iv_get(self, "@title");
  VALUE printer = rb_iv_get(self, "@printer");
  VALUE url_path = rb_iv_get(self, "@url_path");
 
  char *fname = RSTRING_PTR(file); // Filename
+ char *title = T_STRING == TYPE(rname) ? RSTRING_PTR(rname) : "rCups";
  char *target = RSTRING_PTR(printer); // Target printer string
  char *url = RSTRING_PTR(url_path); // Server URL address
  int port = 631; // Default CUPS port
- 
+
  VALUE job_options = rb_iv_get(self, "@job_options");
 
  // Create an array of the keys from the job_options hash
  VALUE job_options_keys = rb_ary_new();
  rb_hash_foreach(job_options, cups_keys_i, job_options_keys);
- 
+
  VALUE iter;
  int num_options = 0;
  cups_option_t *options = NULL;
@@ -520,6 +522,7 @@ void Init_cups() {
  rb_define_attr(printJobs, "url_path", 1, 0);
  rb_define_attr(printJobs, "job_id", 1, 0);
  rb_define_attr(printJobs, "job_options", 1, 0);
+ rb_define_attr(printJobs, "title", 1, 1);
 
  // Cups::PrintJob Methods
  rb_define_method(printJobs, "initialize", job_init, -1);

test/cups_test.rb

@@ -110,14 +110,23 @@ def test_dest_options_returns_hash_if_real
  def test_dest_options_raises_exception_if_not_real
  assert_raise(RuntimeError, "The printer or destination doesn't exist!") { Cups.options_for("bollocks_printer") }
  end
- 
+
  def test_job_failed_boolean
  pj = Cups::PrintJob.new(sample, @printer)
  pj.print
  pj.cancel
  assert !pj.failed?
  end
-
+
+ def test_job_title
+ pj = Cups::PrintJob.new(sample, @printer)
+ pj.title = 'a-test-job'
+ pj.print
+ job = Cups.all_jobs(@printer)[ pj.job_id ]
+ assert_equal 'a-test-job', job[:title]
+ pj.cancel
+ end
+
  def test_returns_failure_string_on_cancellation
  pj = Cups::PrintJob.new(blank_sample, @printer)
  pj.print