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):
73
to_messages_file=sys.stdout):
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self.to_file = to_file
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self.to_messages_file = to_messages_file
79
self.last_total = None
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self.show_pct = show_pct
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self.show_spinner = show_spinner
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self.show_eta = show_eta
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self.show_bar = show_bar
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self.show_count = show_count
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def note(self, fmt_string, *args, **kwargs):
87
"""Record a note without disrupting the progress bar."""
89
self.to_messages_file.write(fmt_string % args)
90
self.to_messages_file.write('\n')
93
class DummyProgress(_BaseProgressBar):
94
"""Progress-bar standin that does nothing.
96
This can be used as the default argument for methods that
97
take an optional progress indicator."""
101
def update(self, msg=None, current=None, total=None):
107
def note(self, fmt_string, *args, **kwargs):
108
"""See _BaseProgressBar.note()."""
111
class DotsProgressBar(_BaseProgressBar):
112
def __init__(self, **kwargs):
113
_BaseProgressBar.__init__(self, **kwargs)
120
def update(self, msg=None, current_cnt=None, total_cnt=None):
121
if msg and msg != self.last_msg:
123
self.to_file.write('\n')
125
self.to_file.write(msg + ': ')
128
self.to_file.write('.')
132
self.to_file.write('\n')
135
class TTYProgressBar(_BaseProgressBar):
72
136
"""Progress bar display object.
74
138
Several options are available to control the display. These can
91
155
SPIN_CHARS = r'/-\|'
92
156
MIN_PAUSE = 0.1 # seconds
104
object.__init__(self)
105
self.to_file = to_file
106
self.suppressed = not _supports_progress(self.to_file)
159
def __init__(self, **kwargs):
160
from bzrlib.osutils import terminal_width
161
_BaseProgressBar.__init__(self, **kwargs)
107
162
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()
163
self.width = terminal_width()
164
self.start_time = None
165
self.last_update = None
166
self.last_updates = deque()
170
"""Return True if the bar was updated too recently"""
172
if self.start_time is None:
173
self.start_time = self.last_update = now
176
interval = now - self.last_update
177
if interval > 0 and interval < self.MIN_PAUSE:
180
self.last_updates.append(now - self.last_update)
181
self.last_update = now
126
190
def update(self, msg, current_cnt=None, total_cnt=None):
127
191
"""Update and redraw progress bar."""
196
if current_cnt > total_cnt:
197
total_cnt = current_cnt
131
199
# save these for the tick() function
132
200
self.last_msg = msg
133
201
self.last_cnt = current_cnt
134
202
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
207
if self.show_eta and self.start_time and total_cnt:
152
eta = get_eta(self.start_time, current_cnt, total_cnt)
208
eta = get_eta(self.start_time, current_cnt, total_cnt,
209
last_updates = self.last_updates)
153
210
eta_str = " " + str_tdelta(eta)
229
def get_eta(start_time, current, total, enough_samples=3):
281
def get_eta(start_time, current, total, enough_samples=3, last_updates=None, n_recent=10):
230
282
if start_time is None:
249
301
assert total_duration >= elapsed
303
if last_updates and len(last_updates) >= n_recent:
304
while len(last_updates) > n_recent:
305
last_updates.popleft()
306
avg = sum(last_updates) / float(len(last_updates))
307
time_left = avg * (total - current)
309
old_time_left = total_duration - elapsed
311
# We could return the average, or some other value here
312
return (time_left + old_time_left) / 2
251
314
return total_duration - elapsed
265
from time import sleep
330
print 'dumb-terminal test:'
331
pb = DotsProgressBar()
333
pb.update('Leoparden', i, 99)
339
print 'smart-terminal test:'
266
340
pb = ProgressBar(show_pct=True, show_bar=True, show_spinner=False)
267
341
for i in range(100):
268
342
pb.update('Elephanten', i, 99)