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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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# 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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from __future__ import absolute_import
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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 bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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from bzrlib.trace import mutter
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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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"""Detect if we can use pretty progress bars on the output stream f.
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If this returns true we expect that a human may be looking at that
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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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_progress_bar_types = {}
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def ProgressBar(to_file=None, **kwargs):
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"""Abstract factory"""
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requested_bar_type = os.environ.get('BZR_PROGRESS_BAR')
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# An value of '' or not set reverts to standard processing
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if requested_bar_type in (None, ''):
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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 DummyProgress(to_file=to_file, **kwargs)
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# Minor sanitation to prevent spurious errors
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requested_bar_type = requested_bar_type.lower().strip()
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# TODO: jam 20060710 Arguably we shouldn't raise an exception
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# but should instead just disable progress bars if we
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# don't recognize the type
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if requested_bar_type not in _progress_bar_types:
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raise errors.InvalidProgressBarType(requested_bar_type,
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_progress_bar_types.keys())
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return _progress_bar_types[requested_bar_type](to_file=to_file, **kwargs)
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class ProgressBarStack(object):
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"""A stack of progress bars."""
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to_messages_file=None,
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"""Setup the stack with the parameters the progress bars should have."""
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if to_messages_file is None:
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to_messages_file = sys.stdout
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self._to_file = to_file
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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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self._to_messages_file = to_messages_file
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self._klass = klass or ProgressBar
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if len(self._stack) != 0:
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return self._stack[-1]
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if len(self._stack) != 0:
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return self._stack[0]
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def get_nested(self):
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"""Return a nested progress bar."""
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if len(self._stack) == 0:
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func = self.top().child_progress
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new_bar = func(to_file=self._to_file,
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show_pct=self._show_pct,
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show_spinner=self._show_spinner,
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show_eta=self._show_eta,
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show_bar=self._show_bar,
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show_count=self._show_count,
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to_messages_file=self._to_messages_file,
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self._stack.append(new_bar)
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def return_pb(self, bar):
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"""Return bar after its been used."""
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if bar is not self._stack[-1]:
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raise errors.MissingProgressBarFinish()
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class _BaseProgressBar(object):
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to_messages_file=None,
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object.__init__(self)
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if to_messages_file is None:
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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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self.MIN_PAUSE = 0.1 # seconds
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self.start_time = now
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# next update should not throttle
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self.last_update = now - self.MIN_PAUSE - 1
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def finished(self):
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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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"""Return this bar to its progress stack."""
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assert self._stack is not None
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self._stack.return_pb(self)
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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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def child_progress(self, **kwargs):
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return ChildProgress(**kwargs)
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class DummyProgress(_BaseProgressBar):
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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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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 note(self, fmt_string, *args, **kwargs):
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"""See _BaseProgressBar.note()."""
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def child_progress(self, **kwargs):
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return DummyProgress(**kwargs)
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_progress_bar_types['dummy'] = DummyProgress
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_progress_bar_types['none'] = DummyProgress
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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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def child_update(self, message, current, total):
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_progress_bar_types['dots'] = DotsProgressBar
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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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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.last_updates = []
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self._max_last_updates = 10
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self.child_fraction = 0
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self._have_output = False
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def throttle(self, old_msg):
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"""Return True if the bar was updated too recently"""
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# time.time consistently takes 40/4000 ms = 0.01 ms.
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# time.clock() is faster, but gives us CPU time, not wall-clock time
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if self.start_time is not None and (now - self.start_time) < 1:
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if old_msg != self.last_msg:
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interval = now - self.last_update
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if interval < self.MIN_PAUSE:
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self.last_updates.append(now - self.last_update)
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# Don't let the queue grow without bound
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self.last_updates = self.last_updates[-self._max_last_updates:]
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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 child_update(self, message, current, total):
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if current is not None and total != 0:
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child_fraction = float(current) / total
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if self.last_cnt is None:
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elif self.last_cnt + child_fraction <= self.last_total:
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self.child_fraction = child_fraction
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mutter('not updating child fraction')
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if self.last_msg is None:
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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 total_cnt is None:
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total_cnt = self.last_total
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if current_cnt > total_cnt:
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total_cnt = current_cnt
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## # optional corner case optimisation
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## # currently does not seem to fire so costs more than saved.
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## # trivial optimal case:
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## # NB if callers are doing a clear and restore with
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## # the saved values, this will prevent that:
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## # in that case add a restore method that calls
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## # _do_update or some such
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## if (self.last_msg == msg and
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## self.last_cnt == current_cnt and
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## self.last_total == total_cnt and
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## self.child_fraction == child_fraction):
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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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self.child_fraction = child_fraction
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# each function call takes 20ms/4000 = 0.005 ms,
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# but multiple that by 4000 calls -> starts to cost.
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# so anything to make this function call faster
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# will improve base 'diff' time by up to 0.1 seconds.
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if self.throttle(old_msg):
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if self.show_eta and self.start_time and self.last_total:
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eta = get_eta(self.start_time, self.last_cnt + self.child_fraction,
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self.last_total, 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 self.last_total and self.last_cnt:
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pct = 100.0 * ((self.last_cnt + self.child_fraction) / self.last_total)
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pct_str = ' (%5.1f%%)' % pct
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if not self.show_count:
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elif self.last_cnt is None:
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elif self.last_total is None:
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count_str = ' %i' % (self.last_cnt)
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# make both fields the same size
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t = '%i' % (self.last_total)
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c = '%*i' % (len(t), self.last_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(self.last_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) *
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(self.last_cnt + self.child_fraction) / self.last_total))
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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 + self.last_msg + count_str + pct_str + eta_str
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self.to_file.write('\r%-*.*s' % (self.width - 1, self.width - 1, m))
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self._have_output = True
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#self.to_file.flush()
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if self._have_output:
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self.to_file.write('\r%s\r' % (' ' * (self.width - 1)))
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self._have_output = False
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#self.to_file.flush()
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_progress_bar_types['tty'] = TTYProgressBar
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class ChildProgress(_BaseProgressBar):
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"""A progress indicator that pushes its data to the parent"""
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def __init__(self, _stack, **kwargs):
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_BaseProgressBar.__init__(self, _stack=_stack, **kwargs)
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self.parent = _stack.top()
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self.child_fraction = 0
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def update(self, msg, current_cnt=None, total_cnt=None):
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self.current = current_cnt
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if total_cnt is not None:
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self.total = total_cnt
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self.child_fraction = 0
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def child_update(self, message, current, total):
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if current is None or total == 0:
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self.child_fraction = 0
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self.child_fraction = float(current) / total
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if self.current is None:
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count = self.current+self.child_fraction
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if count > self.total:
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mutter('clamping count of %d to %d' % (count, self.total))
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self.parent.child_update(self.message, count, self.total)
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def note(self, *args, **kwargs):
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self.parent.note(*args, **kwargs)
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def str_tdelta(delt):
added
removed
bzrlib/progress.py
