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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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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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will maintain a ProgressBarStack for you.
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For direct use, the factory ProgressBar will return an auto-detected progress
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bar that should match your terminal type. You can manually create a
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ProgressBarStack too if you need multiple levels of cooperating progress bars.
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Note that bzrlib's internal functions use the ui module, so if you are using
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bzrlib it really is best to use bzrlib.ui.ui_factory.
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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 import (
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from bzrlib.trace import mutter
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from bzrlib.symbol_versioning 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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"""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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: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_pct = False
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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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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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@deprecated_method(deprecated_in((2, 1, 0)))
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def note(self, fmt_string, *args):
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"""Record a note without disrupting the progress bar.
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Deprecated: use ui_factory.note() instead or bzrlib.trace. Note that
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ui_factory.note takes just one string as the argument, not a format
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string and arguments.
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self.ui_factory.note(fmt_string % args)
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self.ui_factory.note(fmt_string)
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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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@deprecated_function(deprecated_in((1, 16, 0)))
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_progress_bar_types = {}
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def ProgressBar(to_file=None, **kwargs):
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"""Construct a progress bar.
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Deprecated; ask the ui_factory for a progress task instead.
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"""Abstract factory"""
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if to_file is None:
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to_file = sys.stderr
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requested_bar_type = os.environ.get('BZR_PROGRESS_BAR')
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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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# NOTE: This is also deprecated; you should provide a ProgressView instead.
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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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def __init__(self,
added
removed
bzrlib/progress.py
