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# Copyright (C) 2005 Aaron Bentley <aaron.bentley@utoronto.ca>
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# Copyright (C) 2005 Canonical <canonical.com>
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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"""Simple text-mode progress indicator.
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To display an indicator, create a ProgressBar object. Call it,
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passing Progress objects indicating the current state. When done,
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Progress is suppressed when output is not sent to a terminal, so as
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not to clutter log files.
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# TODO: should be a global option e.g. --silent that disables progress
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# indicators, preferably without needing to adjust all code that
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# potentially calls them.
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# TODO: If not on a tty perhaps just print '......' for the benefit of IDEs, etc
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# TODO: Optionally show elapsed time instead/as well as ETA; nicer
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# when the rate is unpredictable
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from collections import deque
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def _supports_progress(f):
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if not hasattr(f, 'isatty'):
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if os.environ.get('TERM') == 'dumb':
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# e.g. emacs compile window
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def ProgressBar(to_file=sys.stderr, **kwargs):
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"""Abstract factory"""
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if _supports_progress(to_file):
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return TTYProgressBar(to_file=to_file, **kwargs)
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return DotsProgressBar(to_file=to_file, **kwargs)
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class _BaseProgressBar(object):
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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
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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):
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"""Record a note without disrupting the progress bar."""
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self.to_messages_file.write(fmt_string % args)
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self.to_messages_file.write('\n')
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class DummyProgress(_BaseProgressBar):
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"""Progress-bar standin that does nothing.
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This can be used as the default argument for methods that
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take an optional progress indicator."""
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def update(self, msg=None, current=None, total=None):
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def note(self, fmt_string, *args, **kwargs):
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"""See _BaseProgressBar.note()."""
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class DotsProgressBar(_BaseProgressBar):
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def __init__(self, **kwargs):
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_BaseProgressBar.__init__(self, **kwargs)
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def update(self, msg=None, current_cnt=None, total_cnt=None):
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if msg and msg != self.last_msg:
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self.to_file.write('\n')
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self.to_file.write(msg + ': ')
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self.to_file.write('.')
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self.to_file.write('\n')
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class TTYProgressBar(_BaseProgressBar):
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"""Progress bar display object.
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Several options are available to control the display. These can
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be passed as parameters to the constructor or assigned at any time:
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Show percentage complete.
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Show rotating baton. This ticks over on every update even
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if the values don't change.
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Show predicted time-to-completion.
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Show numerical counts.
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The output file should be in line-buffered or unbuffered mode.
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MIN_PAUSE = 0.1 # seconds
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def __init__(self, **kwargs):
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from bzrlib.osutils import terminal_width
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_BaseProgressBar.__init__(self, **kwargs)
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self.width = terminal_width()
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self.start_time = None
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self.last_update = None
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self.last_updates = deque()
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"""Return True if the bar was updated too recently"""
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if self.start_time is None:
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self.start_time = self.last_update = now
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interval = now - self.last_update
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if interval > 0 and interval < self.MIN_PAUSE:
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self.last_updates.append(now - self.last_update)
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self.last_update = now
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self.update(self.last_msg, self.last_cnt, self.last_total)
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def update(self, msg, current_cnt=None, total_cnt=None):
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"""Update and redraw progress bar."""
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if current_cnt > total_cnt:
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total_cnt = current_cnt
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old_msg = self.last_msg
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# save these for the tick() function
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self.last_cnt = current_cnt
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self.last_total = total_cnt
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if old_msg == self.last_msg and self.throttle():
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if self.show_eta and self.start_time and total_cnt:
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eta = get_eta(self.start_time, current_cnt, total_cnt,
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last_updates = self.last_updates)
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eta_str = " " + str_tdelta(eta)
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if self.show_spinner:
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spin_str = self.SPIN_CHARS[self.spin_pos % 4] + ' '
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# always update this; it's also used for the bar
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if self.show_pct and total_cnt and current_cnt:
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pct = 100.0 * current_cnt / total_cnt
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pct_str = ' (%5.1f%%)' % pct
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if not self.show_count:
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elif current_cnt is None:
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elif total_cnt is None:
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count_str = ' %i' % (current_cnt)
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# make both fields the same size
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t = '%i' % (total_cnt)
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c = '%*i' % (len(t), current_cnt)
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count_str = ' ' + c + '/' + t
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# progress bar, if present, soaks up all remaining space
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cols = self.width - 1 - len(msg) - len(spin_str) - len(pct_str) \
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- len(eta_str) - len(count_str) - 3
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# number of markers highlighted in bar
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markers = int(round(float(cols) * current_cnt / total_cnt))
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bar_str = '[' + ('=' * markers).ljust(cols) + '] '
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# don't know total, so can't show completion.
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# so just show an expanded spinning thingy
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m = self.spin_pos % cols
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ms = (' ' * m + '*').ljust(cols)
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bar_str = '[' + ms + '] '
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m = spin_str + bar_str + msg + count_str + pct_str + eta_str
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assert len(m) < self.width
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self.to_file.write('\r' + m.ljust(self.width - 1))
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#self.to_file.flush()
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self.to_file.write('\r%s\r' % (' ' * (self.width - 1)))
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#self.to_file.flush()
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def str_tdelta(delt):
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delt = int(round(delt))
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return '%d:%02d:%02d' % (delt/3600,
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def get_eta(start_time, current, total, enough_samples=3, last_updates=None, n_recent=10):
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if start_time is None:
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if current < enough_samples:
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elapsed = time.time() - start_time
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if elapsed < 2.0: # not enough time to estimate
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total_duration = float(elapsed) * float(total) / float(current)
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assert total_duration >= elapsed
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if last_updates and len(last_updates) >= n_recent:
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while len(last_updates) > n_recent:
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last_updates.popleft()
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avg = sum(last_updates) / float(len(last_updates))
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time_left = avg * (total - current)
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old_time_left = total_duration - elapsed
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# We could return the average, or some other value here
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return (time_left + old_time_left) / 2
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return total_duration - elapsed
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result = doctest.testmod()
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print "All tests passed"
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print "No tests to run"
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print 'dumb-terminal test:'
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pb = DotsProgressBar()
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pb.update('Leoparden', i, 99)
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print 'smart-terminal test:'
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pb = ProgressBar(show_pct=True, show_bar=True, show_spinner=False)
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pb.update('Elephanten', i, 99)
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if __name__ == "__main__":
added
removed
bzrlib/progress.py
