Refresh CLI output by input.

Change-Id: I3257d418e3af3d668d17d2c16e1bd7ec9d2b01ea

mozc-nazoru/src/nazoru/core.py

@@ -23,4 +23,4 @@ from .nazorunet import nazorunet
 from .nazorunet import Conv
 from .nazorunet import DepthSepConv
 from .predictor import NazoruPredictor
-
+from .utils import clear_screen

mozc-nazoru/src/nazoru/keyboard_recorder.py

@@ -23,6 +23,7 @@ import os
 import struct
 import sys
 import termios
+from .utils import clear_screen
 
 try:
   import evdev
@@ -130,10 +131,12 @@ class KeyboardRecorderFromConsole(KeyboardRecorder):
           if not recording:
             recording = True
             start_time = datetime.datetime.now()
+            clear_screen()
           elapsed_time = now - start_time
           elapsed_ms = int(elapsed_time.total_seconds() * 1000)
           last_time = now
           data.append((key, elapsed_ms))
+          sys.stdout.write('%s\r' % (' '.join(datum[0] for datum in data)))
           self.log(key, elapsed_ms)
         if last_time and (now - last_time).total_seconds() > wait_seconds:
           break
@@ -260,6 +263,8 @@ class KeyboardRecorderFromEvdev(KeyboardRecorder):
         start_time = now
       elapsed_ms = int((now - start_time).total_seconds() * 1000)
       data.append((self.KEYS[event.code], elapsed_ms))
+      clear_screen()
+      sys.stdout.write('%s\r' % (' '.join(datum[0] for datum in data)))
     return (data, None)
 
 InputSource = Enum('InputSource', 'EVDEV CONSOLE')

mozc-nazoru/src/nazoru/utils.py

@@ -15,6 +15,7 @@
 # limitations under the License.
 
 import time
+import sys
 
 class Measure():
   def __init__(self, tag):
@@ -26,3 +27,8 @@ class Measure():
   def __exit__(self, type, value, traceback):
     now = time.time()
     print('[{0}] {1} ms'.format(self._tag, (now - self._start)*1E3))
+
+def clear_screen():
+  sys.stdout.write('\033[2J')
+  sys.stdout.write('\033[H')
+  sys.stdout.flush()