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# 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: If not on a tty perhaps just print '......' for the benefit of IDEs, etc
# TODO: Optionally show elapsed time instead/as well as ETA; nicer
# when the rate is unpredictable
import sys
import time
import os
from collections import deque
def _supports_progress(f):
if not hasattr(f, 'isatty'):
return False
if not f.isatty():
return False
if os.environ.get('TERM') == 'dumb':
# e.g. emacs compile window
return False
return True
def ProgressBar(to_file=sys.stderr, **kwargs):
"""Abstract factory"""
if _supports_progress(to_file):
return TTYProgressBar(to_file=to_file, **kwargs)
else:
return DotsProgressBar(to_file=to_file, **kwargs)
class _BaseProgressBar(object):
def __init__(self,
to_file=sys.stderr,
show_pct=False,
show_spinner=False,
show_eta=True,
show_bar=True,
show_count=True,
to_messages_file=sys.stdout):
object.__init__(self)
self.to_file = to_file
self.to_messages_file = to_messages_file
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
def note(self, fmt_string, *args, **kwargs):
"""Record a note without disrupting the progress bar."""
self.clear()
self.to_messages_file.write(fmt_string % args)
self.to_messages_file.write('\n')
class DummyProgress(_BaseProgressBar):
"""Progress-bar standin that does nothing.
This can be used as the default argument for methods that
take an optional progress indicator."""
def tick(self):
pass
def update(self, msg=None, current=None, total=None):
pass
def clear(self):
pass
def note(self, fmt_string, *args, **kwargs):
"""See _BaseProgressBar.note()."""
class DotsProgressBar(_BaseProgressBar):
def __init__(self, **kwargs):
_BaseProgressBar.__init__(self, **kwargs)
self.last_msg = None
self.need_nl = False
def tick(self):
self.update()
def update(self, msg=None, current_cnt=None, total_cnt=None):
if msg and msg != self.last_msg:
if self.need_nl:
self.to_file.write('\n')
self.to_file.write(msg + ': ')
self.last_msg = msg
self.need_nl = True
self.to_file.write('.')
def clear(self):
if self.need_nl:
self.to_file.write('\n')
class TTYProgressBar(_BaseProgressBar):
"""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
def __init__(self, **kwargs):
from bzrlib.osutils import terminal_width
_BaseProgressBar.__init__(self, **kwargs)
self.spin_pos = 0
self.width = terminal_width()
self.start_time = None
self.last_update = None
self.last_updates = deque()
def throttle(self):
"""Return True if the bar was updated too recently"""
now = time.time()
if self.start_time is None:
self.start_time = self.last_update = now
return False
else:
interval = now - self.last_update
if interval > 0 and interval < self.MIN_PAUSE:
return True
self.last_updates.append(now - self.last_update)
self.last_update = now
return False
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 current_cnt < 0:
current_cnt = 0
if current_cnt > total_cnt:
total_cnt = current_cnt
old_msg = self.last_msg
# save these for the tick() function
self.last_msg = msg
self.last_cnt = current_cnt
self.last_total = total_cnt
if old_msg == self.last_msg and self.throttle():
return
if self.show_eta and self.start_time and total_cnt:
eta = get_eta(self.start_time, current_cnt, total_cnt,
last_updates = self.last_updates)
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):
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, last_updates=None, n_recent=10):
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
if last_updates and len(last_updates) >= n_recent:
while len(last_updates) > n_recent:
last_updates.popleft()
avg = sum(last_updates) / float(len(last_updates))
time_left = avg * (total - current)
old_time_left = total_duration - elapsed
# We could return the average, or some other value here
return (time_left + old_time_left) / 2
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():
sleep = time.sleep
print 'dumb-terminal test:'
pb = DotsProgressBar()
for i in range(100):
pb.update('Leoparden', i, 99)
sleep(0.1)
sleep(1.5)
pb.clear()
sleep(1.5)
print 'smart-terminal test:'
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()
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