1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
|
# Copyright (C) 2005, 2006, 2007, 2008, 2009 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""UI abstraction.
This tells the library how to display things to the user. Through this
layer different applications can choose the style of UI.
At the moment this layer is almost trivial: the application can just
choose the style of progress bar.
Set the ui_factory member to define the behaviour. The default
displays no output.
"""
import os
import sys
import warnings
from bzrlib.lazy_import import lazy_import
lazy_import(globals(), """
import getpass
from bzrlib import (
errors,
osutils,
progress,
trace,
)
""")
class UIFactory(object):
"""UI abstraction.
This tells the library how to display things to the user. Through this
layer different applications can choose the style of UI.
"""
def __init__(self):
self._task_stack = []
def get_password(self, prompt='', **kwargs):
"""Prompt the user for a password.
:param prompt: The prompt to present the user
:param kwargs: Arguments which will be expanded into the prompt.
This lets front ends display different things if
they so choose.
:return: The password string, return None if the user canceled the
request. Note that we do not touch the encoding, users may
have whatever they see fit and the password should be
transported as is.
"""
raise NotImplementedError(self.get_password)
def nested_progress_bar(self):
"""Return a nested progress bar.
When the bar has been finished with, it should be released by calling
bar.finished().
"""
if self._task_stack:
t = progress.ProgressTask(self._task_stack[-1], self)
else:
t = progress.ProgressTask(None, self)
self._task_stack.append(t)
return t
def _progress_finished(self, task):
"""Called by the ProgressTask when it finishes"""
if not self._task_stack:
warnings.warn("%r finished but nothing is active"
% (task,))
elif task != self._task_stack[-1]:
warnings.warn("%r is not the active task %r"
% (task, self._task_stack[-1]))
else:
del self._task_stack[-1]
if not self._task_stack:
self._progress_all_finished()
def _progress_all_finished(self):
"""Called when the top-level progress task finished"""
pass
def _progress_updated(self, task):
"""Called by the ProgressTask when it changes.
Should be specialized to draw the progress.
"""
pass
def clear_term(self):
"""Prepare the terminal for output.
This will, for example, clear text progress bars, and leave the
cursor at the leftmost position.
"""
pass
def get_boolean(self, prompt):
"""Get a boolean question answered from the user.
:param prompt: a message to prompt the user with. Should be a single
line without terminating \n.
:return: True or False for y/yes or n/no.
"""
raise NotImplementedError(self.get_boolean)
def recommend_upgrade(self,
current_format_name,
basedir):
# this should perhaps be in the TextUIFactory and the default can do
# nothing
trace.warning("%s is deprecated "
"and a better format is available.\n"
"It is recommended that you upgrade by "
"running the command\n"
" bzr upgrade %s",
current_format_name,
basedir)
def report_transport_activity(self, transport, byte_count, direction):
"""Called by transports as they do IO.
This may update a progress bar, spinner, or similar display.
By default it does nothing.
"""
pass
class CLIUIFactory(UIFactory):
"""Common behaviour for command line UI factories.
This is suitable for dumb terminals that can't repaint existing text."""
def __init__(self, stdin=None, stdout=None, stderr=None):
UIFactory.__init__(self)
self.stdin = stdin or sys.stdin
self.stdout = stdout or sys.stdout
self.stderr = stderr or sys.stderr
def get_boolean(self, prompt):
# FIXME: make a regexp and handle case variations as well.
while True:
self.prompt(prompt + "? [y/n]: ")
line = self.stdin.readline()
if line in ('y\n', 'yes\n'):
return True
if line in ('n\n', 'no\n'):
return False
def get_non_echoed_password(self):
isatty = getattr(self.stdin, 'isatty', None)
if isatty is not None and isatty():
# getpass() ensure the password is not echoed and other
# cross-platform niceties
password = getpass.getpass('')
else:
# echo doesn't make sense without a terminal
password = self.stdin.readline()
if not password:
password = None
elif password[-1] == '\n':
password = password[:-1]
return password
def get_password(self, prompt='', **kwargs):
"""Prompt the user for a password.
:param prompt: The prompt to present the user
:param kwargs: Arguments which will be expanded into the prompt.
This lets front ends display different things if
they so choose.
:return: The password string, return None if the user
canceled the request.
"""
prompt += ': '
self.prompt(prompt, **kwargs)
# There's currently no way to say 'i decline to enter a password'
# as opposed to 'my password is empty' -- does it matter?
return self.get_non_echoed_password()
def get_username(self, prompt, **kwargs):
"""Prompt the user for a username.
:param prompt: The prompt to present the user
:param kwargs: Arguments which will be expanded into the prompt.
This lets front ends display different things if
they so choose.
:return: The username string, return None if the user
canceled the request.
"""
prompt += ': '
self.prompt(prompt, **kwargs)
username = self.stdin.readline()
if not username:
username = None
elif username[-1] == '\n':
username = username[:-1]
return username
def prompt(self, prompt, **kwargs):
"""Emit prompt on the CLI."""
prompt = prompt % kwargs
prompt = prompt.encode(osutils.get_terminal_encoding(), 'replace')
self.clear_term()
self.stdout.write(prompt)
def note(self, msg):
"""Write an already-formatted message."""
self.stdout.write(msg + '\n')
class SilentUIFactory(CLIUIFactory):
"""A UI Factory which never prints anything.
This is the default UI, if another one is never registered.
"""
def __init__(self):
CLIUIFactory.__init__(self)
def get_password(self, prompt='', **kwargs):
return None
def get_username(self, prompt='', **kwargs):
return None
def prompt(self, prompt, **kwargs):
pass
def note(self, msg):
pass
def clear_decorator(func, *args, **kwargs):
"""Decorator that clears the term"""
ui_factory.clear_term()
func(*args, **kwargs)
ui_factory = SilentUIFactory()
"""IMPORTANT: never import this symbol directly. ONLY ever access it as
ui.ui_factory."""
def make_ui_for_terminal(stdin, stdout, stderr):
"""Construct and return a suitable UIFactory for a text mode program.
If stdout is a smart terminal, this gets a smart UIFactory with
progress indicators, etc. If it's a dumb terminal, just plain text output.
"""
cls = None
isatty = getattr(stdin, 'isatty', None)
if isatty is None:
cls = CLIUIFactory
elif not isatty():
cls = CLIUIFactory
elif os.environ.get('TERM') in ('dumb', ''):
# e.g. emacs compile window
cls = CLIUIFactory
# User may know better, otherwise default to TextUIFactory
if ( os.environ.get('BZR_USE_TEXT_UI', None) is not None
or cls is None):
from bzrlib.ui.text import TextUIFactory
cls = TextUIFactory
return cls(stdin=stdin, stdout=stdout, stderr=stderr)
|