1
# Copyright (C) 2005-2010 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
"""Progress indicators.
20
The usual way to use this is via bzrlib.ui.ui_factory.nested_progress_bar which
21
will manage a conceptual stack of nested activities.
30
from bzrlib.symbol_versioning import (
36
def _supports_progress(f):
37
"""Detect if we can use pretty progress bars on file F.
39
If this returns true we expect that a human may be looking at that
40
output, and that we can repaint a line to update it.
42
This doesn't check the policy for whether we *should* use them.
44
isatty = getattr(f, 'isatty', None)
49
# The following case also handles Win32 - on that platform $TERM is
50
# typically never set, so the case None is treated as a smart terminal,
51
# not dumb. <https://bugs.launchpad.net/bugs/334808> win32 files do have
52
# isatty methods that return true.
53
if os.environ.get('TERM') == 'dumb':
54
# e.g. emacs compile window
59
class ProgressTask(object):
60
"""Model component of a progress indicator.
62
Most code that needs to indicate progress should update one of these,
63
and it will in turn update the display, if one is present.
65
Code updating the task may also set fields as hints about how to display
66
it: show_pct, show_spinner, show_eta, show_count, show_bar. UIs
67
will not necessarily respect all these fields.
69
:ivar update_latency: The interval (in seconds) at which the PB should be
70
updated. Setting this to zero suggests every update should be shown
73
:ivar show_transport_activity: If true (default), transport activity
74
will be shown when this task is drawn. Disable it if you're sure
75
that only irrelevant or uninteresting transport activity can occur
79
def __init__(self, parent_task=None, ui_factory=None, progress_view=None):
80
"""Construct a new progress task.
82
:param parent_task: Enclosing ProgressTask or None.
84
:param progress_view: ProgressView to display this ProgressTask.
86
:param ui_factory: The UI factory that will display updates;
87
deprecated in favor of passing progress_view directly.
89
Normally you should not call this directly but rather through
90
`ui_factory.nested_progress_bar`.
92
self._parent_task = parent_task
95
self.current_cnt = None
97
# TODO: deprecate passing ui_factory
98
self.ui_factory = ui_factory
99
self.progress_view = progress_view
100
self.show_pct = False
101
self.show_spinner = True
102
self.show_eta = False,
103
self.show_count = True
105
self.update_latency = 0.1
106
self.show_transport_activity = True
109
return '%s(%r/%r, msg=%r)' % (
110
self.__class__.__name__,
115
def update(self, msg, current_cnt=None, total_cnt=None):
117
self.current_cnt = current_cnt
119
self.total_cnt = total_cnt
120
if self.progress_view:
121
self.progress_view.show_progress(self)
123
self.ui_factory._progress_updated(self)
126
self.update(self.msg)
129
if self.progress_view:
130
self.progress_view.task_finished(self)
132
self.ui_factory._progress_finished(self)
134
def make_sub_task(self):
135
return ProgressTask(self, ui_factory=self.ui_factory,
136
progress_view=self.progress_view)
138
def _overall_completion_fraction(self, child_fraction=0.0):
139
"""Return fractional completion of this task and its parents
141
Returns None if no completion can be computed."""
142
if self.current_cnt is not None and self.total_cnt:
143
own_fraction = (float(self.current_cnt) + child_fraction) / self.total_cnt
145
# if this task has no estimation, it just passes on directly
146
# whatever the child has measured...
147
own_fraction = child_fraction
148
if self._parent_task is None:
151
if own_fraction is None:
153
return self._parent_task._overall_completion_fraction(own_fraction)
156
# TODO: deprecate this method; the model object shouldn't be concerned
157
# with whether it's shown or not. Most callers use this because they
158
# want to write some different non-progress output to the screen, but
159
# they should probably instead use a stream that's synchronized with
160
# the progress output. It may be there is a model-level use for
161
# saying "this task's not active at the moment" but I don't see it. --
163
if self.progress_view:
164
self.progress_view.clear()
166
self.ui_factory.clear_term()
169
# NOTE: This is also deprecated; you should provide a ProgressView instead.
170
class _BaseProgressBar(object):
179
to_messages_file=None,
181
object.__init__(self)
184
if to_messages_file is None:
185
to_messages_file = sys.stdout
186
self.to_file = to_file
187
self.to_messages_file = to_messages_file
190
self.last_total = None
191
self.show_pct = show_pct
192
self.show_spinner = show_spinner
193
self.show_eta = show_eta
194
self.show_bar = show_bar
195
self.show_count = show_count
198
self.MIN_PAUSE = 0.1 # seconds
201
self.start_time = now
202
# next update should not throttle
203
self.last_update = now - self.MIN_PAUSE - 1
206
"""Return this bar to its progress stack."""
208
self._stack.return_pb(self)
211
class DummyProgress(object):
212
"""Progress-bar standin that does nothing.
214
This was previously often constructed by application code if no progress
215
bar was explicitly passed in. That's no longer recommended: instead, just
216
create a progress task from the ui_factory. This class can be used in
217
test code that needs to fake a progress task for some reason.
223
def update(self, msg=None, current=None, total=None):
226
def child_update(self, message, current, total):
232
def child_progress(self, **kwargs):
233
return DummyProgress(**kwargs)
236
def str_tdelta(delt):
239
delt = int(round(delt))
240
return '%d:%02d:%02d' % (delt/3600,
245
def get_eta(start_time, current, total, enough_samples=3, last_updates=None, n_recent=10):
246
if start_time is None:
252
if current < enough_samples:
258
elapsed = time.time() - start_time
260
if elapsed < 2.0: # not enough time to estimate
263
total_duration = float(elapsed) * float(total) / float(current)
265
if last_updates and len(last_updates) >= n_recent:
266
avg = sum(last_updates) / float(len(last_updates))
267
time_left = avg * (total - current)
269
old_time_left = total_duration - elapsed
271
# We could return the average, or some other value here
272
return (time_left + old_time_left) / 2
274
return total_duration - elapsed
277
class ProgressPhase(object):
278
"""Update progress object with the current phase"""
279
def __init__(self, message, total, pb):
280
object.__init__(self)
282
self.message = message
284
self.cur_phase = None
286
def next_phase(self):
287
if self.cur_phase is None:
291
self.pb.update(self.message, self.cur_phase, self.total)
added
removed
bzrlib/progress.py
