Improve speed when output is disabled

There's no point in trying to render if output isn't happening.
This brings benchmark time from about 26 seconds to 7.

4 files changed, 9 insertions, 1 deletions

diff --git a/speed-test b/speed-test
index c3fb646..3c04899 100755
--- a/speed-test
+++ b/speed-test
@@ -53,6 +53,7 @@ ts.format(
     '%ElapsedTime() %Counter(current-file) files found; '
     '%ByteSize(uploaded-bytes) uploaded %Pathname(current-dir)')
 ts['uploaded-bytes'] = 0
+ts.disable()
 
 num_updates = 1000*1000
 
diff --git a/ttystatus/messager.py b/ttystatus/messager.py
index 8743561..00b05d1 100644
--- a/ttystatus/messager.py
+++ b/ttystatus/messager.py
@@ -60,6 +60,10 @@ class Messager(object):
         '''Enable output to happen.'''
         self._enabled = True
 
+    def is_enabled(self):
+        '''Is output enabled?'''
+        return self._enabled
+
     def time_to_write(self):
         '''Is it time to write now?'''
         return self._now() - self._previous_write_at >= self._period
diff --git a/ttystatus/status.py b/ttystatus/status.py
index b4232d2..46e291f 100644
--- a/ttystatus/status.py
+++ b/ttystatus/status.py
@@ -92,7 +92,7 @@ class TerminalStatus(object):
         for row in self._widget_rows:
             for w in row:
                 w.update(self)
-        if self._m.time_to_write():
+        if self._m.is_enabled() and self._m.time_to_write():
             self._write()
 
     def flush(self):
diff --git a/ttystatus/status_tests.py b/ttystatus/status_tests.py
index ecf91f9..0a96917 100644
--- a/ttystatus/status_tests.py
+++ b/ttystatus/status_tests.py
@@ -51,6 +51,9 @@ class DummyMessager(object):
     def disable(self):
         self.enabled = False
 
+    def is_enabled(self):
+        return self.enabled
+
 
 class TerminalStatusTests(unittest.TestCase):