1
# Copyright (C) 2005 Aaron Bentley <aaron.bentley@utoronto.ca>
2
# Copyright (C) 2005 Canonical <canonical.com>
4
# This program is free software; you can redistribute it and/or modify
5
# it under the terms of the GNU General Public License as published by
6
# the Free Software Foundation; either version 2 of the License, or
7
# (at your option) any later version.
9
# This program is distributed in the hope that it will be useful,
10
# but WITHOUT ANY WARRANTY; without even the implied warranty of
11
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
# GNU General Public License for more details.
14
# You should have received a copy of the GNU General Public License
15
# along with this program; if not, write to the Free Software
16
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19
"""Simple text-mode progress indicator.
21
To display an indicator, create a ProgressBar object. Call it,
22
passing Progress objects indicating the current state. When done,
25
Progress is suppressed when output is not sent to a terminal, so as
26
not to clutter log files.
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
17
"""Progress indicators.
19
The usual way to use this is via bzrlib.ui.ui_factory.nested_progress_bar which
20
will manage a conceptual stack of nested activities.
29
# TODO: should be a global option e.g. --silent that disables progress
30
# indicators, preferably without needing to adjust all code that
31
# potentially calls them.
33
# TODO: If not on a tty perhaps just print '......' for the benefit of IDEs, etc
35
# TODO: Optionally show elapsed time instead/as well as ETA; nicer
36
# when the rate is unpredictable
23
from __future__ import absolute_import
45
"""Return estimated terminal width.
47
TODO: Do something smart on Windows?
49
TODO: Is there anything that gets a better update when the window
50
is resized while the program is running?
53
return int(os.environ['COLUMNS'])
54
except (IndexError, KeyError, ValueError):
58
29
def _supports_progress(f):
59
if not hasattr(f, 'isatty'):
30
"""Detect if we can use pretty progress bars on file F.
32
If this returns true we expect that a human may be looking at that
33
output, and that we can repaint a line to update it.
35
This doesn't check the policy for whether we *should* use them.
37
isatty = getattr(f, 'isatty', None)
42
# The following case also handles Win32 - on that platform $TERM is
43
# typically never set, so the case None is treated as a smart terminal,
44
# not dumb. <https://bugs.launchpad.net/bugs/334808> win32 files do have
45
# isatty methods that return true.
63
46
if os.environ.get('TERM') == 'dumb':
64
47
# e.g. emacs compile window
70
def ProgressBar(to_file=sys.stderr, **kwargs):
71
"""Abstract factory"""
72
if _supports_progress(to_file):
73
return TTYProgressBar(to_file=to_file, **kwargs)
75
return DotsProgressBar(to_file=to_file, **kwargs)
78
class _BaseProgressBar(object):
87
self.to_file = to_file
91
self.last_total = None
92
self.show_pct = show_pct
93
self.show_spinner = show_spinner
94
self.show_eta = show_eta
95
self.show_bar = show_bar
96
self.show_count = show_count
100
class DummyProgress(_BaseProgressBar):
52
class ProgressTask(object):
53
"""Model component of a progress indicator.
55
Most code that needs to indicate progress should update one of these,
56
and it will in turn update the display, if one is present.
58
Code updating the task may also set fields as hints about how to display
59
it: show_pct, show_spinner, show_eta, show_count, show_bar. UIs
60
will not necessarily respect all these fields.
62
The message given when updating a task must be unicode, not bytes.
64
:ivar update_latency: The interval (in seconds) at which the PB should be
65
updated. Setting this to zero suggests every update should be shown
68
:ivar show_transport_activity: If true (default), transport activity
69
will be shown when this task is drawn. Disable it if you're sure
70
that only irrelevant or uninteresting transport activity can occur
74
def __init__(self, parent_task=None, ui_factory=None, progress_view=None):
75
"""Construct a new progress task.
77
:param parent_task: Enclosing ProgressTask or None.
79
:param progress_view: ProgressView to display this ProgressTask.
81
:param ui_factory: The UI factory that will display updates;
82
deprecated in favor of passing progress_view directly.
84
Normally you should not call this directly but rather through
85
`ui_factory.nested_progress_bar`.
87
self._parent_task = parent_task
90
self.current_cnt = None
92
# TODO: deprecate passing ui_factory
93
self.ui_factory = ui_factory
94
self.progress_view = progress_view
96
self.show_spinner = True
97
self.show_eta = False,
98
self.show_count = True
100
self.update_latency = 0.1
101
self.show_transport_activity = True
104
return '%s(%r/%r, msg=%r)' % (
105
self.__class__.__name__,
110
def update(self, msg, current_cnt=None, total_cnt=None):
111
"""Report updated task message and if relevent progress counters
113
The message given must be unicode, not a byte string.
116
self.current_cnt = current_cnt
118
self.total_cnt = total_cnt
119
if self.progress_view:
120
self.progress_view.show_progress(self)
122
self.ui_factory._progress_updated(self)
125
self.update(self.msg)
128
if self.progress_view:
129
self.progress_view.task_finished(self)
131
self.ui_factory._progress_finished(self)
133
def make_sub_task(self):
134
return ProgressTask(self, ui_factory=self.ui_factory,
135
progress_view=self.progress_view)
137
def _overall_completion_fraction(self, child_fraction=0.0):
138
"""Return fractional completion of this task and its parents
140
Returns None if no completion can be computed."""
141
if self.current_cnt is not None and self.total_cnt:
142
own_fraction = (float(self.current_cnt) + child_fraction) / self.total_cnt
144
# if this task has no estimation, it just passes on directly
145
# whatever the child has measured...
146
own_fraction = child_fraction
147
if self._parent_task is None:
150
if own_fraction is None:
152
return self._parent_task._overall_completion_fraction(own_fraction)
155
# TODO: deprecate this method; the model object shouldn't be concerned
156
# with whether it's shown or not. Most callers use this because they
157
# want to write some different non-progress output to the screen, but
158
# they should probably instead use a stream that's synchronized with
159
# the progress output. It may be there is a model-level use for
160
# saying "this task's not active at the moment" but I don't see it. --
162
if self.progress_view:
163
self.progress_view.clear()
165
self.ui_factory.clear_term()
168
class DummyProgress(object):
101
169
"""Progress-bar standin that does nothing.
103
This can be used as the default argument for methods that
104
take an optional progress indicator."""
171
This was previously often constructed by application code if no progress
172
bar was explicitly passed in. That's no longer recommended: instead, just
173
create a progress task from the ui_factory. This class can be used in
174
test code that needs to fake a progress task for some reason.
108
180
def update(self, msg=None, current=None, total=None):
115
class DotsProgressBar(_BaseProgressBar):
116
def __init__(self, **kwargs):
117
_BaseProgressBar.__init__(self, **kwargs)
124
def update(self, msg=None, current_cnt=None, total_cnt=None):
125
if msg and msg != self.last_msg:
127
self.to_file.write('\n')
129
self.to_file.write(msg + ': ')
132
self.to_file.write('.')
136
self.to_file.write('\n')
139
class TTYProgressBar(_BaseProgressBar):
140
"""Progress bar display object.
142
Several options are available to control the display. These can
143
be passed as parameters to the constructor or assigned at any time:
146
Show percentage complete.
148
Show rotating baton. This ticks over on every update even
149
if the values don't change.
151
Show predicted time-to-completion.
155
Show numerical counts.
157
The output file should be in line-buffered or unbuffered mode.
160
MIN_PAUSE = 0.1 # seconds
163
def __init__(self, **kwargs):
164
_BaseProgressBar.__init__(self, **kwargs)
166
self.width = _width()
167
self.start_time = None
168
self.last_update = None
172
"""Return True if the bar was updated too recently"""
174
if self.start_time is None:
175
self.start_time = self.last_update = now
178
interval = now - self.last_update
179
if interval > 0 and interval < self.MIN_PAUSE:
182
self.last_update = now
187
self.update(self.last_msg, self.last_cnt, self.last_total)
191
def update(self, msg, current_cnt=None, total_cnt=None):
192
"""Update and redraw progress bar."""
197
if current_cnt > total_cnt:
198
total_cnt = current_cnt
200
# save these for the tick() function
202
self.last_cnt = current_cnt
203
self.last_total = total_cnt
208
if self.show_eta and self.start_time and total_cnt:
209
eta = get_eta(self.start_time, current_cnt, total_cnt)
210
eta_str = " " + str_tdelta(eta)
214
if self.show_spinner:
215
spin_str = self.SPIN_CHARS[self.spin_pos % 4] + ' '
219
# always update this; it's also used for the bar
222
if self.show_pct and total_cnt and current_cnt:
223
pct = 100.0 * current_cnt / total_cnt
224
pct_str = ' (%5.1f%%)' % pct
228
if not self.show_count:
230
elif current_cnt is None:
232
elif total_cnt is None:
233
count_str = ' %i' % (current_cnt)
235
# make both fields the same size
236
t = '%i' % (total_cnt)
237
c = '%*i' % (len(t), current_cnt)
238
count_str = ' ' + c + '/' + t
241
# progress bar, if present, soaks up all remaining space
242
cols = self.width - 1 - len(msg) - len(spin_str) - len(pct_str) \
243
- len(eta_str) - len(count_str) - 3
246
# number of markers highlighted in bar
247
markers = int(round(float(cols) * current_cnt / total_cnt))
248
bar_str = '[' + ('=' * markers).ljust(cols) + '] '
250
# don't know total, so can't show completion.
251
# so just show an expanded spinning thingy
252
m = self.spin_pos % cols
253
ms = (' ' * m + '*').ljust(cols)
255
bar_str = '[' + ms + '] '
261
m = spin_str + bar_str + msg + count_str + pct_str + eta_str
263
assert len(m) < self.width
264
self.to_file.write('\r' + m.ljust(self.width - 1))
265
#self.to_file.flush()
269
self.to_file.write('\r%s\r' % (' ' * (self.width - 1)))
270
#self.to_file.flush()
183
def child_update(self, message, current, total):
189
def child_progress(self, **kwargs):
190
return DummyProgress(**kwargs)
274
193
def str_tdelta(delt):