1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
# Copyright (C) 2005 Aaron Bentley <aaron.bentley@utoronto.ca>
# Copyright (C) 2005 Canonical <canonical.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Simple text-mode progress indicator.
To display an indicator, create a ProgressBar object. Call it,
passing Progress objects indicating the current state. When done,
call clear().
Progress is suppressed when output is not sent to a terminal, so as
not to clutter log files.
"""
# TODO: should be a global option e.g. --silent that disables progress
# indicators, preferably without needing to adjust all code that
# potentially calls them.
# TODO: Perhaps don't write updates faster than a certain rate, say
# 5/second.
# TODO: Optionally show elapsed time instead/as well as ETA; nicer
# when the rate is unpredictable
import sys
import time
def _width():
"""Return estimated terminal width.
TODO: Do something smart on Windows?
TODO: Is there anything that gets a better update when the window
is resized while the program is running?
"""
import os
try:
return int(os.environ['COLUMNS'])
except (IndexError, KeyError, ValueError):
return 80
def _supports_progress(f):
if not hasattr(f, 'isatty'):
return False
if not f.isatty():
return False
import os
if os.environ.get('TERM') == 'dumb':
# e.g. emacs compile window
return False
return True
class ProgressBar(object):
"""Progress bar display object.
Several options are available to control the display. These can
be passed as parameters to the constructor or assigned at any time:
show_pct
Show percentage complete.
show_spinner
Show rotating baton. This ticks over on every update even
if the values don't change.
show_eta
Show predicted time-to-completion.
show_bar
Show bar graph.
show_count
Show numerical counts.
The output file should be in line-buffered or unbuffered mode.
"""
SPIN_CHARS = r'/-\|'
MIN_PAUSE = 0.1 # seconds
start_time = None
last_update = None
def __init__(self,
to_file=sys.stderr,
show_pct=False,
show_spinner=False,
show_eta=True,
show_bar=True,
show_count=True):
object.__init__(self)
self.to_file = to_file
self.suppressed = not _supports_progress(self.to_file)
self.spin_pos = 0
self.last_msg = None
self.last_cnt = None
self.last_total = None
self.show_pct = show_pct
self.show_spinner = show_spinner
self.show_eta = show_eta
self.show_bar = show_bar
self.show_count = show_count
self.width = _width()
def tick(self):
self.update(self.last_msg, self.last_cnt, self.last_total)
def update(self, msg, current_cnt=None, total_cnt=None):
"""Update and redraw progress bar."""
if self.suppressed:
return
# save these for the tick() function
self.last_msg = msg
self.last_cnt = current_cnt
self.last_total = total_cnt
now = time.time()
if self.start_time is None:
self.start_time = now
else:
interval = now - self.last_update
if interval > 0 and interval < self.MIN_PAUSE:
return
self.last_update = now
if total_cnt:
assert current_cnt <= total_cnt
if current_cnt:
assert current_cnt >= 0
if self.show_eta and self.start_time and total_cnt:
eta = get_eta(self.start_time, current_cnt, total_cnt)
eta_str = " " + str_tdelta(eta)
else:
eta_str = ""
if self.show_spinner:
spin_str = self.SPIN_CHARS[self.spin_pos % 4] + ' '
else:
spin_str = ''
# always update this; it's also used for the bar
self.spin_pos += 1
if self.show_pct and total_cnt and current_cnt:
pct = 100.0 * current_cnt / total_cnt
pct_str = ' (%5.1f%%)' % pct
else:
pct_str = ''
if not self.show_count:
count_str = ''
elif current_cnt is None:
count_str = ''
elif total_cnt is None:
count_str = ' %i' % (current_cnt)
else:
# make both fields the same size
t = '%i' % (total_cnt)
c = '%*i' % (len(t), current_cnt)
count_str = ' ' + c + '/' + t
if self.show_bar:
# progress bar, if present, soaks up all remaining space
cols = self.width - 1 - len(msg) - len(spin_str) - len(pct_str) \
- len(eta_str) - len(count_str) - 3
if total_cnt:
# number of markers highlighted in bar
markers = int(round(float(cols) * current_cnt / total_cnt))
bar_str = '[' + ('=' * markers).ljust(cols) + '] '
elif False:
# don't know total, so can't show completion.
# so just show an expanded spinning thingy
m = self.spin_pos % cols
ms = (' ' * m + '*').ljust(cols)
bar_str = '[' + ms + '] '
else:
bar_str = ''
else:
bar_str = ''
m = spin_str + bar_str + msg + count_str + pct_str + eta_str
assert len(m) < self.width
self.to_file.write('\r' + m.ljust(self.width - 1))
#self.to_file.flush()
def clear(self):
if self.suppressed:
return
self.to_file.write('\r%s\r' % (' ' * (self.width - 1)))
#self.to_file.flush()
def str_tdelta(delt):
if delt is None:
return "-:--:--"
delt = int(round(delt))
return '%d:%02d:%02d' % (delt/3600,
(delt/60) % 60,
delt % 60)
def get_eta(start_time, current, total, enough_samples=3):
if start_time is None:
return None
if not total:
return None
if current < enough_samples:
return None
if current > total:
return None # wtf?
elapsed = time.time() - start_time
if elapsed < 2.0: # not enough time to estimate
return None
total_duration = float(elapsed) * float(total) / float(current)
assert total_duration >= elapsed
return total_duration - elapsed
def run_tests():
import doctest
result = doctest.testmod()
if result[1] > 0:
if result[0] == 0:
print "All tests passed"
else:
print "No tests to run"
def demo():
from time import sleep
pb = ProgressBar(show_pct=True, show_bar=True, show_spinner=False)
for i in range(100):
pb.update('Elephanten', i, 99)
sleep(0.1)
sleep(2)
pb.clear()
sleep(1)
print 'done!'
if __name__ == "__main__":
demo()
|