44
"""Return estimated terminal width.
46
TODO: Do something smart on Windows?
48
TODO: Is there anything that gets a better update when the window
49
is resized while the program is running?
53
return int(os.environ['COLUMNS'])
54
except (IndexError, KeyError, ValueError):
42
from collections import deque
58
45
def _supports_progress(f):
71
class ProgressBar(object):
57
def ProgressBar(to_file=sys.stderr, **kwargs):
58
"""Abstract factory"""
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if _supports_progress(to_file):
60
return TTYProgressBar(to_file=to_file, **kwargs)
62
return DotsProgressBar(to_file=to_file, **kwargs)
65
class _BaseProgressBar(object):
74
self.to_file = to_file
78
self.last_total = None
79
self.show_pct = show_pct
80
self.show_spinner = show_spinner
81
self.show_eta = show_eta
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self.show_bar = show_bar
83
self.show_count = show_count
87
class DummyProgress(_BaseProgressBar):
88
"""Progress-bar standin that does nothing.
90
This can be used as the default argument for methods that
91
take an optional progress indicator."""
95
def update(self, msg=None, current=None, total=None):
102
class DotsProgressBar(_BaseProgressBar):
103
def __init__(self, **kwargs):
104
_BaseProgressBar.__init__(self, **kwargs)
111
def update(self, msg=None, current_cnt=None, total_cnt=None):
112
if msg and msg != self.last_msg:
114
self.to_file.write('\n')
116
self.to_file.write(msg + ': ')
119
self.to_file.write('.')
123
self.to_file.write('\n')
126
class TTYProgressBar(_BaseProgressBar):
72
127
"""Progress bar display object.
74
129
Several options are available to control the display. These can
91
146
SPIN_CHARS = r'/-\|'
92
147
MIN_PAUSE = 0.1 # seconds
104
object.__init__(self)
105
self.to_file = to_file
106
self.suppressed = not _supports_progress(self.to_file)
150
def __init__(self, **kwargs):
151
from bzrlib.osutils import terminal_width
152
_BaseProgressBar.__init__(self, **kwargs)
107
153
self.spin_pos = 0
111
self.last_total = None
112
self.show_pct = show_pct
113
self.show_spinner = show_spinner
114
self.show_eta = show_eta
115
self.show_bar = show_bar
116
self.show_count = show_count
118
self.width = _width()
154
self.width = terminal_width()
155
self.start_time = None
156
self.last_update = None
157
self.last_updates = deque()
161
"""Return True if the bar was updated too recently"""
163
if self.start_time is None:
164
self.start_time = self.last_update = now
167
interval = now - self.last_update
168
if interval > 0 and interval < self.MIN_PAUSE:
171
self.last_updates.append(now - self.last_update)
172
self.last_update = now
126
181
def update(self, msg, current_cnt=None, total_cnt=None):
127
182
"""Update and redraw progress bar."""
187
if current_cnt > total_cnt:
188
total_cnt = current_cnt
131
190
# save these for the tick() function
132
191
self.last_msg = msg
133
192
self.last_cnt = current_cnt
134
193
self.last_total = total_cnt
137
if self.start_time is None:
138
self.start_time = now
140
interval = now - self.last_update
141
if interval > 0 and interval < self.MIN_PAUSE:
144
self.last_update = now
147
assert current_cnt <= total_cnt
149
assert current_cnt >= 0
151
198
if self.show_eta and self.start_time and total_cnt:
152
eta = get_eta(self.start_time, current_cnt, total_cnt)
199
eta = get_eta(self.start_time, current_cnt, total_cnt,
200
last_updates = self.last_updates)
153
201
eta_str = " " + str_tdelta(eta)
229
def get_eta(start_time, current, total, enough_samples=3):
274
def get_eta(start_time, current, total, enough_samples=3, last_updates=None, n_recent=10):
230
275
if start_time is None:
249
294
assert total_duration >= elapsed
296
if last_updates and len(last_updates) >= n_recent:
297
while len(last_updates) > n_recent:
298
last_updates.popleft()
299
avg = sum(last_updates) / float(len(last_updates))
300
time_left = avg * (total - current)
302
old_time_left = total_duration - elapsed
304
# We could return the average, or some other value here
305
return (time_left + old_time_left) / 2
251
307
return total_duration - elapsed
265
from time import sleep
323
print 'dumb-terminal test:'
324
pb = DotsProgressBar()
326
pb.update('Leoparden', i, 99)
332
print 'smart-terminal test:'
266
333
pb = ProgressBar(show_pct=True, show_bar=True, show_spinner=False)
267
334
for i in range(100):
268
335
pb.update('Elephanten', i, 99)