forked from bpython/bpython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathurwid.py
More file actions
1352 lines (1132 loc) · 50 KB
/
urwid.py
File metadata and controls
1352 lines (1132 loc) · 50 KB
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
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#
# The MIT License
#
# Copyright (c) 2010-2011 Marien Zwart
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""bpython backend based on Urwid.
Based on Urwid 0.9.9.
This steals many things from bpython's "cli" backend.
This is still *VERY* rough.
"""
from __future__ import absolute_import, division, print_function
import sys
import os
import time
import locale
import signal
from types import ModuleType
from optparse import Option
from six.moves import range
from six import iteritems, string_types
from pygments.token import Token
from bpython import args as bpargs, repl, translations
from bpython._py3compat import py3
from bpython.formatter import theme_map
from bpython.importcompletion import find_coroutine
from bpython.translations import _
from bpython.keys import urwid_key_dispatch as key_dispatch
import urwid
if not py3:
import inspect
Parenthesis = Token.Punctuation.Parenthesis
# Urwid colors are:
# 'black', 'dark red', 'dark green', 'brown', 'dark blue',
# 'dark magenta', 'dark cyan', 'light gray', 'dark gray',
# 'light red', 'light green', 'yellow', 'light blue',
# 'light magenta', 'light cyan',
8000
9;white'
# and bpython has:
# blacK, Red, Green, Yellow, Blue, Magenta, Cyan, White, Default
COLORMAP = {
'k': 'black',
'r': 'dark red', # or light red?
'g': 'dark green', # or light green?
'y': 'yellow',
'b': 'dark blue', # or light blue?
'm': 'dark magenta', # or light magenta?
'c': 'dark cyan', # or light cyan?
'w': 'white',
'd': 'default',
}
def getpreferredencoding():
return locale.getpreferredencoding() or "ascii"
try:
from twisted.internet import protocol
from twisted.protocols import basic
except ImportError:
pass
else:
class EvalProtocol(basic.LineOnlyReceiver):
delimiter = '\n'
def __init__(self, myrepl):
self.repl = myrepl
def lineReceived(self, line):
# HACK!
# TODO: deal with encoding issues here...
self.repl.main_loop.process_input(line)
self.repl.main_loop.process_input(['enter'])
class EvalFactory(protocol.ServerFactory):
def __init__(self, myrepl):
self.repl = myrepl
def buildProtocol(self, addr):
return EvalProtocol(self.repl)
# If Twisted is not available urwid has no TwistedEventLoop attribute.
# Code below will try to import reactor before using TwistedEventLoop.
# I assume TwistedEventLoop will be available if that import succeeds.
if urwid.VERSION < (1, 0, 0) and hasattr(urwid, 'TwistedEventLoop'):
class TwistedEventLoop(urwid.TwistedEventLoop):
"""TwistedEventLoop modified to properly stop the reactor.
urwid 0.9.9 and 0.9.9.1 crash the reactor on ExitMainLoop instead
of stopping it. One obvious way this breaks is if anything used
the reactor's thread pool: that thread pool is not shut down if
the reactor is not stopped, which means python hangs on exit
(joining the non-daemon threadpool threads that never exit). And
the default resolver is the ThreadedResolver, so if we looked up
any names we hang on exit. That is bad enough that we hack up
urwid a bit here to exit properly.
"""
def handle_exit(self, f):
def wrapper(*args, **kwargs):
try:
return f(*args, **kwargs)
except urwid.ExitMainLoop:
# This is our change.
self.reactor.stop()
except:
# This is the same as in urwid.
# We are obviously not supposed to ever hit this.
import sys
print(sys.exc_info())
self._exc_info = sys.exc_info()
self.reactor.crash()
return wrapper
else:
TwistedEventLoop = getattr(urwid, 'TwistedEventLoop', None)
class StatusbarEdit(urwid.Edit):
"""Wrapper around urwid.Edit used for the prompt in Statusbar.
This class only adds a single signal that is emitted if the user presses
Enter."""
signals = urwid.Edit.signals + ['prompt_enter']
def __init__(self, *args, **kwargs):
self.single = False
urwid.Edit.__init__(self, *args, **kwargs)
def keypress(self, size, key):
if self.single:
urwid.emit_signal(self, 'prompt_enter', self, key)
elif key == 'enter':
urwid.emit_signal(self, 'prompt_enter', self, self.get_edit_text())
else:
return urwid.Edit.keypress(self, size, key)
urwid.register_signal(StatusbarEdit, 'prompt_enter')
class Statusbar(object):
"""Statusbar object, ripped off from bpython.cli.
This class provides the status bar at the bottom of the screen.
It has message() and prompt() methods for user interactivity, as
well as settext() and clear() methods for changing its appearance.
The check() method needs to be called repeatedly if the statusbar is
going to be aware of when it should update its display after a message()
has been called (it'll display for a couple of seconds and then disappear).
It should be called as:
foo = Statusbar('Initial text to display')
or, for a blank statusbar:
foo = Statusbar()
The "widget" attribute
527E
is an urwid widget.
"""
signals = ['prompt_result']
def __init__(self, config, s=None, main_loop=None):
self.config = config
self.timer = None
self.main_loop = main_loop
self.s = s or ''
self.text = urwid.Text(('main', self.s))
# use wrap mode 'clip' to just cut off at the end of line
self.text.set_wrap_mode('clip')
self.edit = StatusbarEdit(('main', ''))
urwid.connect_signal(self.edit, 'prompt_enter', self._on_prompt_enter)
self.widget = urwid.Columns([self.text, self.edit])
def _check(self, callback, userdata=None):
"""This is the method is called from the timer to reset the status bar."""
self.timer = None
self.settext(self.s)
def message(self, s, n=3):
"""Display a message for a short n seconds on the statusbar and return
it to its original state."""
self.settext(s)
self.timer = self.main_loop.set_alarm_in(n, self._check)
def _reset_timer(self):
"""Reset the timer from message."""
if self.timer is not None:
self.main_loop.remove_alarm(self.timer)
self.timer = None
def prompt(self, s=None, single=False):
"""Prompt the user for some input (with the optional prompt 's'). After
the user hit enter the signal 'prompt_result' will be emited and the
status bar will be reset. If single is True, the first keypress will be
returned."""
self._reset_timer()
self.edit.single = single
self.edit.set_caption(('main', s or '?'))
self.edit.set_edit_text('')
# hide the text and display the edit widget
if not self.edit in self.widget.widget_list:
self.widget.widget_list.append(self.edit)
if self.text in self.widget.widget_list:
self.widget.widget_list.remove(self.text)
self.widget.set_focus_column(0)
def settext(self, s, permanent=False):
"""Set the text on the status bar to a new value. If permanent is True,
the new value will be permanent. If that status bar is in prompt mode,
the prompt will be aborted. """
self._reset_timer()
# hide the edit and display the text widget
if self.edit in self.widget.widget_list:
self.widget.widget_list.remove(self.edit)
if not self.text in self.widget.widget_list:
self.widget.widget_list.append(self.text)
self.text.set_text(('main', s))
if permanent:
self.s = s
def clear(self):
"""Clear the status bar."""
self.settext('')
def _on_prompt_enter(self, edit, new_text):
"""Reset the statusbar and pass the input from the prompt to the caller
via 'prompt_result'."""
self.settext(self.s)
urwid.emit_signal(self, 'prompt_result', new_text)
urwid.register_signal(Statusbar, 'prompt_result')
def decoding_input_filter(keys, raw):
"""Input filter for urwid which decodes each key with the locale's
preferred encoding.'"""
encoding = locale.getpreferredencoding()
converted_keys = list()
for key in keys:
if isinstance(key, string_types):
converted_keys.append(key.decode(encoding))
else:
converted_keys.append(key)
return converted_keys
def format_tokens(tokensource):
for token, text in tokensource:
if text == '\n':
continue
# TODO: something about inversing Parenthesis
while token not in theme_map:
token = token.parent
yield (theme_map[token], text)
class BPythonEdit(urwid.Edit):
"""Customized editor *very* tightly interwoven with URWIDRepl.
Changes include:
- The edit text supports markup, not just the caption.
This works by calling set_edit_markup from the change event
as well as whenever markup changes while text does not.
- The widget can be made readonly, which currently just means
it is no longer selectable and stops drawing the cursor.
This is currently a one-way operation, but that is just because
I only need and test the readwrite->readonly transition.
- move_cursor_to_coords is ignored
(except for internal calls from keypress or mouse_event).
- arrow up/down are ignored.
- an "edit-pos-changed" signal is emitted when edit_pos changes.
"""
signals = ['edit-pos-changed']
def __init__(self, config, *args, **kwargs):
self._bpy_text = ''
self._bpy_attr = []
self._bpy_selectable = True
self._bpy_may_move_cursor = False
self.config = config
self.tab_length = config.tab_length
urwid.Edit.__init__(self, *args, **kwargs)
def set_edit_pos(self, pos):
urwid.Edit.set_edit_pos(self, pos)
self._emit("edit-pos-changed", self.edit_pos)
def get_edit_pos(self):
return self._edit_pos
edit_pos = property(get_edit_pos, set_edit_pos)
def make_readonly(self):
self._bpy_selectable = False
# This is necessary to prevent the listbox we are in getting
# fresh cursor coords of None from get_cursor_coords
# immediately after we go readonly and then getting a cached
# canvas that still has the cursor set. It spots that
# inconsistency and raises.
self._invalidate()
def set_edit_markup(self, markup):
"""Call this when markup changes but the underlying text does not.
You should arrange for this to be called from the 'change' signal.
"""
if markup:
self._bpy_text, self._bpy_attr = urwid.decompose_tagmarkup(markup)
else:
# decompose_tagmarkup in some urwids fails on the empty list
self._bpy_text, self._bpy_attr = '', []
# This is redundant when we're called off the 'change' signal.
# I'm assuming this is cheap, making that ok.
self._invalidate()
def get_text(self):
return self._caption + self._bpy_text, self._attrib + self._bpy_attr
def selectable(self):
return self._bpy_selectable
def get_cursor_coords(self, *args, **kwargs):
# urwid gets confused if a nonselectable widget has a cursor position.
if not self._bpy_selectable:
return None
return urwid.Edit.get_cursor_coords(self, *args, **kwargs)
def render(self, size, focus=False):
# XXX I do not want to have to do this, but listbox gets confused
# if I do not (getting None out of get_cursor_coords because
# we just became unselectable, then having this render a cursor)
if not self._bpy_selectable:
focus = False
return urwid.Edit.render(self, size, focus=focus)
def get_pref_col(self, size):
# Need to make this deal with us being nonselectable
if not self._bpy_selectable:
return 'left'
return urwid.Edit.get_pref_col(self, size)
def move_cursor_to_coords(self, *args):
if self._bpy_may_move_cursor:
return urwid.Edit.move_cursor_to_coords(self, *args)
return False
def keypress(self, size, key):
if urwid.command_map[key] in ['cursor up', 'cursor down']:
# Do not handle up/down arrow, leave them for the repl.
return key
self._bpy_may_move_cursor = True
try:
if urwid.command_map[key] == 'cursor max left':
self.edit_pos = 0
elif urwid.command_map[key] == 'cursor max right':
self.edit_pos = len(self.get_edit_text())
elif urwid.command_map[key] == 'clear word':
# ^w
if self.edit_pos == 0:
return
line = self.get_edit_text()
# delete any space left of the cursor
p = len(line[:self.edit_pos].strip())
line = line[:p] + line[self.edit_pos:]
# delete a full word
np = line.rfind(' ', 0, p)
if np == -1:
line = line[p:]
np = 0
else:
line = line[:np] + line[p:]
self.set_edit_text(line)
self.edit_pos = np
elif urwid.command_map[key] == 'clear line':
line = self.get_edit_text()
self.set_edit_text(line[self.edit_pos:])
self.edit_pos = 0
elif key == 'backspace':
line = self.get_edit_text()
cpos = len(line) - self.edit_pos
if not (cpos or len(line) % self.tab_length or line.strip()):
self.set_edit_text(line[:-self.tab_length])
else:
return urwid.Edit.keypress(self, size, key)
else:
# TODO: Add in specific keypress fetching code here
return urwid.Edit.keypress(self, size, key)
return None
finally:
self._bpy_may_move_cursor = False
def mouse_event(self, *args):
self._bpy_may_move_cursor = True
try:
return urwid.Edit.mouse_event(self, *args)
finally:
self._bpy_may_move_cursor = False
class BPythonListBox(urwid.ListBox):
"""Like `urwid.ListBox`, except that it does not eat up and
down keys.
"""
def keypress(self, size, key):
if key not in ["up", "down"]:
return urwid.ListBox.keypress(self, size, key)
return key
class Tooltip(urwid.BoxWidget):
"""Container inspired by Overlay to position our tooltip.
bottom_w should be a BoxWidget.
The top window currently has to be a listbox to support shrinkwrapping.
This passes keyboard events to the bottom instead of the top window.
It also positions the top window relative to the cursor position
from the bottom window and hides it if there is no cursor.
"""
def __init__(self, bottom_w, listbox):
self.__super.__init__()
self.bottom_w = bottom_w
self.listbox = listbox
# TODO: this linebox should use the 'main' color.
self.top_w = urwid.LineBox(listbox)
self.tooltip_focus = False
def selectable(self):
return self.bottom_w.selectable()
def keypress(self, size, key):
return self.bottom_w.keypress(size, key)
def mouse_event(self, size, event, button, col, row, focus):
# TODO: pass to top widget if visible and inside it.
if not hasattr(self.bottom_w, 'mouse_event'):
return False
return self.bottom_w.mouse_event(
size, event, button, col, row, focus)
def get_cursor_coords(self, size):
return self.bottom_w.get_cursor_coords(size)
def render(self, size, focus=False):
maxcol, maxrow = size
bottom_c = self.bottom_w.render(size, focus)
cursor = bottom_c.cursor
if not cursor:
# Hide the tooltip if there is no cursor.
return bottom_c
cursor_x, cursor_y = cursor
if cursor_y * 2 < maxrow:
# Cursor is in the top half. Tooltip goes below it:
y = cursor_y + 1
rows = maxrow - y
else:
# Cursor is in the bottom half. Tooltip fills the area above:
y = 0
rows = cursor_y
# HACK: shrink-wrap the tooltip. This is ugly in multiple ways:
# - It only works on a listbox.
# - It assumes the wrapping LineBox eats one char on each edge.
# - It is a loop.
# (ideally it would check how much free space there is,
# instead of repeatedly trying smaller sizes)
while 'bottom' in self.listbox.ends_visible((maxcol - 2, rows - 3)):
rows -= 1
# If we're displaying above the cursor move the top edge down:
if not y:
y = cursor_y - rows
# Render *both* windows focused. This is probably not normal in urwid,
# but it works nicely.
top_c = self.top_w.render((maxcol, rows),
focus and self.tooltip_focus)
combi_c = urwid.CanvasOverlay(top_c, bottom_c, 0, y)
# Use the cursor coordinates from the bottom canvas.
canvas = urwid.CompositeCanvas(combi_c)
canvas.cursor = cursor
return canvas
class URWIDInteraction(repl.Interaction):
def __init__(self, config, statusbar, frame):
repl.Interaction.__init__(self, config, statusbar)
self.frame = frame
urwid.connect_signal(statusbar, 'prompt_result', self._prompt_result)
self.callback = None
def confirm(self, q, callback):
"""Ask for yes or no and call callback to return the result"""
def callback_wrapper(result):
callback(result.lower() in (_('y'), _('yes')))
self.prompt(q, callback_wrapper, single=True)
def notify(self, s, n=10, wait_for_keypress=False):
return self.statusbar.message(s, n)
def prompt(self, s, callback=None, single=False):
"""Prompt the user for input. The result will be returned via calling
callback. Note that there can only be one prompt active. But the
callback can already start a new prompt."""
if self.callback is not None:
raise Exception('Prompt already in progress')
self.callback = callback
self.statusbar.prompt(s, single=single)
self.frame.set_focus('footer')
def _prompt_result(self, text):
self.frame.set_focus('body')
if self.callback is not None:
# The callback might want to start another prompt, so reset it
# before calling the callback.
callback = self.callback
self.callback = None
callback(text)
class URWIDRepl(repl.Repl):
_time_between_redraws = .05 # seconds
def __init__(self, event_loop, palette, interpreter, config):
repl.Repl.__init__(self, interpreter, config)
self._redraw_handle = None
self._redraw_pending = False
self._redraw_time = 0
self.listbox = BPythonListBox(urwid.SimpleListWalker([]))
self.tooltip = urwid.ListBox(urwid.SimpleListWalker([]))
self.tooltip.grid = None
self.overlay = Tooltip(self.listbox, self.tooltip)
self.stdout_hist = ''
self.frame = urwid.Frame(self.overlay)
if urwid.get_encoding_mode() == 'narrow':
input_filter = decoding_input_filter
else:
input_filter = None
# This constructs a raw_display.Screen, which nabs sys.stdin/out.
self.main_loop = urwid.MainLoop(
self.frame, palette,
event_loop=event_loop, unhandled_input=self.handle_input,
input_filter=input_filter, handle_mouse=False)
# String is straight from bpython.cli
self.statusbar = Statusbar(config,
_(" <%s> Rewind <%s> Save <%s> Pastebin "
" <%s> Pager <%s> Show Source ") %
(config.undo_key, config.save_key, config.pastebin_key,
config.last_output_key, config.show_source_key), self.main_loop)
self.frame.set_footer(self.statusbar.widget)
self.interact = URWIDInteraction(self.config, self.statusbar, self.frame)
self.edits = []
self.edit = None
self.current_output = None
self._completion_update_suppressed = False
# Bulletproof: this is a value extract_exit_value accepts.
self.exit_value = ()
load_urwid_command_map(config)
# Subclasses of Repl need to implement echo, current_line, cw
def echo(self, orig_s):
s = orig_s.rstrip('\n')
if s:
if self.current_output is None:
self.current_output = urwid.Text(('output', s))
if self.edit is None:
self.listbox.body.append(self.current_output)
# Focus the widget we just added to force the
# listbox to scroll. This causes output to scroll
# if the user runs a blocking call that prints
# more than a screenful, instead of staying
# scrolled to the previous input line and then
# jumping to the bottom when done.
self.listbox.set_focus(len(self.listbox.body) - 1)
else:
self.listbox.body.insert(-1, self.current_output)
# The edit widget should be focused and *stay* focused.
# XXX TODO: make sure the cursor stays in the same spot.
self.listbox.set_focus(len(self.listbox.body) - 1)
else:
# XXX this assumes this all has "output" markup applied.
self.current_output.set_text(
('output', self.current_output.text + s))
if orig_s.endswith('\n'):
self.current_output = None
# If we hit this repeatedly in a loop the redraw is rather
# slow (testcase: pprint(__builtins__). So if we have recently
# drawn the screen already schedule a call in the future.
#
# Unfortunately we may hit this function repeatedly through a
# blocking call triggered by the user, in which case our
# timeout will not run timely as we do not return to urwid's
# eventloop. So we manually check if our timeout has long
# since expired, and redraw synchronously if it has.
if self._redraw_handle is None:
self.main_loop.draw_screen()
def maybe_redraw(loop, self):
if self._redraw_pending:
loop.draw_screen()
self._redraw_pending = False
self._redraw_handle = None
self._redraw_handle = self.main_loop.set_alarm_in(
self._time_between_redraws, maybe_redraw, self)
self._redraw_time = time.time()
else:
self._redraw_pending = True
now = time.time()
if now - self._redraw_time > 2 * self._time_between_redraws:
# The timeout is well past expired, assume we're
# blocked and redraw synchronously.
self.main_loop.draw_screen()
self._redraw_time = now
def _get_current_line(self):
if self.edit is None:
return ''
return self.edit.get_edit_text()
def _set_current_line(self, line):
self.edit.set_edit_text(line)
current_line = property(_get_current_line, _set_current_line, None,
"Return the current line (the one the cursor is in).")
def cw(self):
"""Return the current word (incomplete word left of cursor)."""
if self.edit is None:
return
pos = self.edit.edit_pos
text = self.edit.get_edit_text()
if pos != len(text):
# Disable autocomplete if not at end of line, like cli does.
return
# Stolen from cli. TODO: clean up and split out.
if (not text or
(not text[-1].isalnum() and text[-1] not in ('.', '_'))):
return
# Seek backwards in text for the first non-identifier char:
for i, c in enumerate(reversed(text)):
if not c.isalnum() and c not in ('.', '_'):
break
else:
# No non-identifiers, return everything.
return text
# Return everything to the right of the non-identifier.
return text[-i:]
@property
def cpos(self):
if self.edit is not None:
return len(self.current_line) - self.edit.edit_pos
return 0
def _get_cursor_offset(self):
return self.edit.edit_pos
def _set_cursor_offset(self, offset):
self.edit.edit_pos = offset
cursor_offset = property(_get_cursor_offset, _set_cursor_offset, None,
"The cursor offset from the beginning of the line")
def _populate_completion(self):
widget_list = self.tooltip.body
while widget_list:
widget_list.pop()
# This is just me flailing around wildly. TODO: actually write.
if self.complete():
if self.funcprops:
# This is mostly just stolen from the cli module.
func_name, args, is_bound = self.funcprops
in_arg = self.arg_pos
args, varargs, varkw, defaults = args[:4]
if py3:
kwonly = self.funcprops.argspec.kwonly
kwonly_defaults = self.funcprops.argspec.kwonly_defaults or {}
else:
kwonly, kwonly_defaults = [], {}
markup = [('bold name', func_name),
('name', ': (')]
# the isinstance checks if we're in a positional arg
# (instead of a keyword arg), I think
if is_bound and isinstance(in_arg, int):
in_arg += 1
# bpython.cli checks if this goes off the edge and
# does clever wrapping. I do not (yet).
for k, i in enumerate(args):
if defaults and k + 1 > len(args) - len(defaults):
kw = repr(defaults[k - (len(args) - len(defaults))])
else:
kw = None
if not k and str(i) == 'self':
color = 'name'
else:
color = 'token'
if k == in_arg or i == in_arg:
color = 'bold ' + color
if not py3:
# See issue #138: We need to format tuple unpacking correctly
# We use the undocumented function inspection.strseq() for
# that. Fortunately, that madness is gone in Python 3.
markup.append((color, inspect.strseq(i, str)))
else:
markup.append((color, str(i)))
if kw is not None:
markup.extend([('punctuation', '='),
('token', kw)])
if k != len(args) - 1:
markup.append(('punctuation', ', '))
if varargs:
if args:
markup.append(('punctuation', ', '))
markup.append(('token', '*' + varargs))
if kwonly:
if not varargs:
if args:
markup.append(('punctuation', ', '))
markup.append(('punctuation', '*'))
for arg in kwonly:
if arg == in_arg:
color = 'bold token'
else:
color = 'token'
markup.extend([('punctuation', ', '),
(color, arg)])
if arg in kwonly_defaults:
markup.extend([('punctuation', '='),
('token', kwonly_defaults[arg])])
if varkw:
if args or varargs or kwonly:
markup.append(('punctuation', ', '))
markup.append(('token', '**' + varkw))
markup.append(('punctuation', ')'))
widget_list.append(urwid.Text(markup))
if self.matches_iter.matches:
attr_map = {}
focus_map = {'main': 'operator'}
texts = [urwid.AttrMap(urwid.Text(('main', match)),
attr_map, focus_map)
for match in self.matches_iter.matches]
width = max(text.original_widget.pack()[0] for text in texts)
gridflow = urwid.GridFlow(texts, width, 1, 0, 'left')
widget_list.append(gridflow)
self.tooltip.grid = gridflow
self.overlay.tooltip_focus = False
else:
self.tooltip.grid = None
self.frame.body = self.overlay
else:
self.frame.body = self.listbox
self.tooltip.grid = None
if self.docstring:
# TODO: use self.format_docstring? needs a width/height...
docstring = self.docstring
widget_list.append(urwid.Text(('comment', docstring)))
def reprint_line(self, lineno, tokens):
edit = self.edits[-len(self.buffer) + lineno - 1]
edit.set_edit_markup(list(format_tokens(tokens)))
def getstdout(self):
"""This method returns the 'spoofed' stdout buffer, for writing to a
file or sending to a pastebin or whatever."""
return self.stdout_hist + '\n'
def ask_confirmation(self, q):
"""Ask for yes or no and return boolean"""
try:
reply = self.statusbar.prompt(q)
except ValueError:
return False
return reply.lower() in ('y', 'yes')
def reevaluate(self):
"""Clear the buffer, redraw the screen and re-evaluate the history"""
self.evaluating = True
self.stdout_hist = ''
self.f_string = ''
self.buffer = []
self.scr.erase()
self.s_hist = []
# Set cursor position to -1 to prevent paren matching
self.cpos = -1
self.prompt(False)
self.iy, self.ix = self.scr.getyx()
for line in self.history:
if py3:
self.stdout_hist += line + '\n'
else:
self.stdout_hist += line.encode(locale.getpreferredencoding()) + '\n'
self.print_line(line)
self.s_hist[-1] += self.f_string
# I decided it was easier to just do this manually
# than to make the print_line and history stuff more flexible.
self.scr.addstr('\n')
more = self.push(line)
self.prompt(more)
self.iy, self.ix = self.scr.getyx()
self.cpos = 0
indent = repl.next_indentation(self.s, self.config.tab_length)
self.s = ''
self.scr.refresh()
if self.buffer:
for unused in range(indent):
self.tab()
self.evaluating = False
#map(self.push, self.history)
#^-- That's how simple this method was at first :(
def write(self, s):
"""For overriding stdout defaults"""
if '\x04' in s:
for block in s.split('\x04'):
self.write(block)
return
if s.rstrip() and '\x03' in s:
t = s.split('\x03')[1]
else:
t = s
if not py3 and isinstance(t, unicode):
t = t.encode(locale.getpreferredencoding())
if not self.stdout_hist:
self.stdout_hist = t
else:
self.stdout_hist += t
self.echo(s)
self.s_hist.append(s.rstrip())
def push(self, s, insert_into_history=True):
# Restore the original SIGINT handler. This is needed to be able
# to break out of infinite loops. If the interpreter itself
# sees this it prints 'KeyboardInterrupt' and returns (good).
orig_handler = signal.getsignal(signal.SIGINT)
signal.signal(signal.SIGINT, signal.default_int_handler)
# Pretty blindly adapted from bpython.cli
try:
return repl.Repl.push(self, s, insert_into_history)
except SystemExit as e:
self.exit_value = e.args
raise urwid.ExitMainLoop()
except KeyboardInterrupt:
# KeyboardInterrupt happened between the except block around
# user code execution and this code. This should be rare,
# but make sure to not kill bpython here, so leaning on
# ctrl+c to kill buggy code running inside bpython is safe.
self.keyboard_interrupt()
finally:
signal.signal(signal.SIGINT, orig_handler)
def start(self):
self.prompt(False)
def keyboard_interrupt(self):
# If the user is currently editing, interrupt him. This
# mirrors what the regular python REPL does.
if self.edit is not None:
# XXX this is a lot of code, and I am not sure it is
# actually enough code. Needs some testing.
self.edit.make_readonly()
self.edit = None
self.buffer = []
self.echo('KeyboardInterrupt')
self.prompt(False)
else:
# I do not quite remember if this is reachable, but let's
# be safe.
self.echo('KeyboardInterrupt')
def prompt(self, more):
# Clear current output here, or output resulting from the
# current prompt run will end up appended to the edit widget
# sitting above this prompt:
self.current_output = None
# XXX is this the right place?
self.rl_history.reset()
# XXX what is s_hist?
# We need the caption to use unicode as urwid normalizes later
# input to be the same type, using ascii as encoding. If the
# caption is bytes this breaks typing non-ascii into bpython.
if not more:
if py3:
caption = ('prompt', self.ps1)
else:
caption = ('prompt', self.ps1.decode(getpreferredencoding()))
self.stdout_hist += self.ps1
else:
if py3:
caption = ('prompt_more', self.ps2)
else:
caption = ('prompt_more', self.ps2.decode(getpreferredencoding()))
self.stdout_hist += self.ps2
self.edit = BPythonEdit(self.config, caption=caption)
urwid.connect_signal(self.edit, 'change', self.on_input_change)
urwid.connect_signal(self.edit, 'edit-pos-changed',
self.on_edit_pos_changed)
# Do this after connecting the change signal handler:
self.edit.insert_text(4 * self.next_indentation() * ' ')
self.edits.append(self.edit)