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# Copyright (C) 2005-2010 Canonical Ltd
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Progress indicators.
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The usual way to use this is via bzrlib.ui.ui_factory.nested_progress_bar which
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will manage a conceptual stack of nested activities.
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from __future__ import absolute_import
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def _supports_progress(f):
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"""Detect if we can use pretty progress bars on file F.
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If this returns true we expect that a human may be looking at that
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output, and that we can repaint a line to update it.
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This doesn't check the policy for whether we *should* use them.
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isatty = getattr(f, 'isatty', None)
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# The following case also handles Win32 - on that platform $TERM is
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# typically never set, so the case None is treated as a smart terminal,
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# not dumb. <https://bugs.launchpad.net/bugs/334808> win32 files do have
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# isatty methods that return true.
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if os.environ.get('TERM') == 'dumb':
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# e.g. emacs compile window
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class ProgressTask(object):
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"""Model component of a progress indicator.
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Most code that needs to indicate progress should update one of these,
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and it will in turn update the display, if one is present.
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Code updating the task may also set fields as hints about how to display
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it: show_pct, show_spinner, show_eta, show_count, show_bar. UIs
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will not necessarily respect all these fields.
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The message given when updating a task must be unicode, not bytes.
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:ivar update_latency: The interval (in seconds) at which the PB should be
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updated. Setting this to zero suggests every update should be shown
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:ivar show_transport_activity: If true (default), transport activity
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will be shown when this task is drawn. Disable it if you're sure
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that only irrelevant or uninteresting transport activity can occur
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def __init__(self, parent_task=None, ui_factory=None, progress_view=None):
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"""Construct a new progress task.
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:param parent_task: Enclosing ProgressTask or None.
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:param progress_view: ProgressView to display this ProgressTask.
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:param ui_factory: The UI factory that will display updates;
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deprecated in favor of passing progress_view directly.
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Normally you should not call this directly but rather through
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`ui_factory.nested_progress_bar`.
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self._parent_task = parent_task
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self.current_cnt = None
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# TODO: deprecate passing ui_factory
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self.ui_factory = ui_factory
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self.progress_view = progress_view
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self.show_spinner = True
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self.show_eta = False,
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self.show_count = True
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self.update_latency = 0.1
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self.show_transport_activity = True
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return '%s(%r/%r, msg=%r)' % (
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self.__class__.__name__,
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def update(self, msg, current_cnt=None, total_cnt=None):
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"""Report updated task message and if relevent progress counters
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The message given must be unicode, not a byte string.
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self.current_cnt = current_cnt
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self.total_cnt = total_cnt
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if self.progress_view:
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self.progress_view.show_progress(self)
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self.ui_factory._progress_updated(self)
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self.update(self.msg)
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if self.progress_view:
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self.progress_view.task_finished(self)
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self.ui_factory._progress_finished(self)
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def make_sub_task(self):
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return ProgressTask(self, ui_factory=self.ui_factory,
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progress_view=self.progress_view)
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def _overall_completion_fraction(self, child_fraction=0.0):
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"""Return fractional completion of this task and its parents
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Returns None if no completion can be computed."""
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if self.current_cnt is not None and self.total_cnt:
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own_fraction = (float(self.current_cnt) + child_fraction) / self.total_cnt
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# if this task has no estimation, it just passes on directly
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# whatever the child has measured...
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own_fraction = child_fraction
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if self._parent_task is None:
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if own_fraction is None:
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return self._parent_task._overall_completion_fraction(own_fraction)
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# TODO: deprecate this method; the model object shouldn't be concerned
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# with whether it's shown or not. Most callers use this because they
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# want to write some different non-progress output to the screen, but
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# they should probably instead use a stream that's synchronized with
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# the progress output. It may be there is a model-level use for
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# saying "this task's not active at the moment" but I don't see it. --
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if self.progress_view:
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self.progress_view.clear()
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self.ui_factory.clear_term()
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class DummyProgress(object):
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"""Progress-bar standin that does nothing.
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This was previously often constructed by application code if no progress
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bar was explicitly passed in. That's no longer recommended: instead, just
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create a progress task from the ui_factory. This class can be used in
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test code that needs to fake a progress task for some reason.
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def update(self, msg=None, current=None, total=None):
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def child_update(self, message, current, total):
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def child_progress(self, **kwargs):
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return DummyProgress(**kwargs)
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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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if last_updates and len(last_updates) >= n_recent:
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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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class ProgressPhase(object):
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"""Update progress object with the current phase"""
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def __init__(self, message, total, pb):
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object.__init__(self)
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self.message = message
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self.cur_phase = None
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def next_phase(self):
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if self.cur_phase is None:
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self.pb.update(self.message, self.cur_phase, self.total)
added
removed
bzrlib/progress.py
