-
Notifications
You must be signed in to change notification settings - Fork 1
/
stickybar.py
130 lines (109 loc) · 5.04 KB
/
stickybar.py
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
# Copyright (c) 2014 Evalf
#
# 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.
version = '1.0'
import sys, os, contextlib, platform, threading, select, warnings, time
class StickyBar(threading.Thread):
def __init__(self, fdread, fdwrite, callback, encoding, update):
self.fdread = fdread
self.fdwrite = fdwrite
self.callback = callback
self.encoding = encoding
self.update = update
super().__init__()
def run(self):
self.write(b'\n' + self.callback().encode(self.encoding, errors='ignore') + b'\r\033[A\033[K')
for text in self.read():
self.write(text.replace(b'\n', b'\n\n\033[A\033[L') if text else b'\0337\033[B\r' + self.callback().encode(self.encoding, errors='ignore') + b'\033[K\0338')
self.write(b'\033[B\033[2K\033[A')
def poll(self, timeout):
return timeout > 0 and (platform.system() == 'Windows' or select.select([self.fdread], [], [], timeout)[0])
def read(self):
try:
nextupdate = time.perf_counter() + self.update
while True:
while self.update > 0 and not self.poll(nextupdate - time.perf_counter()):
yield b''
nextupdate += self.update
text = os.read(self.fdread, 1024)
if not text:
break
yield text
if self.update < 0: # redraw bar after every write
yield b''
except OSError:
pass
def write(self, data):
while data:
n = os.write(self.fdwrite, data)
data = data[n:]
@contextlib.contextmanager
def activate(callback, update):
def bar(arg=True):
try:
text = callback(arg)
color = 3 # yellow
except Exception as e:
text = '{}: {}'.format(getattr(type(e), '__name__', 'callback failed'), e)
color = 1 # red
return '\033[0;3{}m{}\033[0m'.format(color, text)
with draw(bar, update):
yield
print('\r{}\033[K'.format(bar(False)))
@contextlib.contextmanager
def draw(callback, update):
with contextlib.ExitStack() as stack:
# create virtual terminal
fdread, fdwrite = getattr(os, 'openpty', os.pipe)()
stack.callback(os.close, fdread) # fdwrite is closed separately to signal to the thread
# save original output file descriptor
fileno = os.dup(sys.stdout.fileno())
stack.callback(os.close, fileno)
# create thread
t = StickyBar(fdread, fileno, callback, sys.stdout.encoding, update)
stack.callback(t.join)
# replace stdout by virtual terminal
os.dup2(fdwrite, sys.stdout.fileno())
stack.callback(os.dup2, fileno, sys.stdout.fileno()) # restore stdout and signal to thread
os.close(fdwrite)
if platform.system() != 'Windows':
os.write(fileno, b'\033[?7l') # disable line wrap
stack.callback(os.write, fileno, b'\033[?7h') # enable line wrap
else:
# set console mode
import ctypes
kernel32 = ctypes.WinDLL('kernel32')
handle = kernel32.GetStdHandle(-11) # https://docs.microsoft.com/en-us/windows/console/getstdhandle
orig_mode = ctypes.c_uint32() # https://docs.microsoft.com/en-us/windows/desktop/WinProg/windows-data-types#lpdword
kernel32.GetConsoleMode(handle, ctypes.byref(orig_mode)) # https://docs.microsoft.com/en-us/windows/console/getconsolemode
new_mode = orig_mode.value
new_mode |= 4 # check ENABLE_VIRTUAL_TERMINAL_PROCESSING
new_mode &= ~2 # uncheck ENABLE_WRAP_AT_EOL_OUTPUT
if new_mode != orig_mode.value:
kernel32.SetConsoleMode(handle, ctypes.c_uint32(new_mode)) # https://docs.microsoft.com/en-us/windows/console/setconsolemode
stack.callback(kernel32.SetConsoleMode, handle, orig_mode)
# In Windows, `sys.stdout` becomes unusable after
# `os.dup2(..,sys.stdout.fileno())`, hence we recreate `sys.stdout` here.
# Because a pipe is not a tty, `fdopen` defaults to buffering with fixed
# size chunks. `buffering=1` enforces lines buffering. The new
# `sys.stdout` answers `False` to `.isatty()` for the same reason.
stack.enter_context(contextlib.redirect_stdout(os.fdopen(sys.stdout.fileno(), 'w', encoding=sys.stdout.encoding, buffering=1)))
# start bar-drawing thread
t.start()
yield