update CountEmitter to take an optional of argument to display 'x of y'

saucebrush/emitters.py

@@ -61,24 +61,37 @@ class CountEmitter(Emitter):
         CountEmitter(every=1000000) would write the count every 1,000,000 records.
     """
 
-    def __init__(self, every=1000, outfile=None, format=None):
+    def __init__(self, every=1000, of=None, outfile=None, format=None):
+        
         super(CountEmitter, self).__init__()
+        
         if not outfile:
             import sys
             self._outfile = sys.stdout
         else:
             self._outfile = outfile
-        self._format = "%s\n" if format is None else format
+            
+        if format is None:
+            if of is not None:
+                format = "%(count)s of %(of)s\n"
+            else:
+                format = "%(count)s\n"
+                
+        self._format = format
         self._every = every
+        self._of = of
         self.count = 0
     
+    def __str__(self):
+        return self._format % {'count': self.count, 'of': self._of}
+
     def emit_record(self, record):
         self.count += 1
         if self.count % self._every == 0:
-            self._outfile.write(self._format % self.count)
+            self._outfile.write(str(self))
     
     def done(self):
-        self._outfile.write(self._format % self.count)
+        self._outfile.write(str(self))
 
 
 class CSVEmitter(Emitter):

saucebrush/tests/emitters.py

@@ -22,13 +22,26 @@ class EmitterTestCase(unittest.TestCase):
         self.assertEquals(self.output.getvalue(), 'x,y,z\r\n1,2,3\r\n5,5,5\r\n')
     
     def test_count_emitter(self):
-        ce = CountEmitter(every=10, outfile=self.output, format="%s records\n")
-        data = ce.attach([1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22])
-        for _ in data:
-            pass
+        
+        # values for test
+        values = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]
+        
+        # test without of parameter
+        ce = CountEmitter(every=10, outfile=self.output, format="%(count)s records\n")
+        list(ce.attach(values))
         self.assertEquals(self.output.getvalue(), '10 records\n20 records\n')
         ce.done()
         self.assertEquals(self.output.getvalue(), '10 records\n20 records\n22 records\n')
         
+        # reset output
+        self.output.truncate(0)
+        
+        # test with of parameter
+        ce = CountEmitter(every=10, outfile=self.output, of=len(values))
+        list(ce.attach(values))
+        self.assertEquals(self.output.getvalue(), '10 of 22\n20 of 22\n')
+        ce.done()
+        self.assertEquals(self.output.getvalue(), '10 of 22\n20 of 22\n22 of 22\n')
+
 if __name__ == '__main__':
     unittest.main()