forked from bpython/bpython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathpager.py
More file actions
80 lines (70 loc) · 2.59 KB
/
pager.py
File metadata and controls
80 lines (70 loc) · 2.59 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
# The MIT License
#
# Copyright (c) 2009-2011 Andreas Stuehrk
#
# 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.
# mypy: disallow_untyped_defs=True
# mypy: disallow_untyped_calls=True
import curses
import errno
import os
import pydoc
import subprocess
import sys
import shlex
from typing import List
def get_pager_command(default: str = "less -rf") -> List[str]:
command = shlex.split(os.environ.get("PAGER", default))
return command
def page_internal(data: str) -> None:
"""A more than dumb pager function."""
if hasattr(pydoc, "ttypager"):
pydoc.ttypager(data)
else:
sys.stdout.write(data)
def page(data: str, use_internal: bool = False) -> None:
command = get_pager_command()
if not command or use_internal:
page_internal(data)
else:
curses.endwin()
try:
popen = subprocess.Popen(command, stdin=subprocess.PIPE)
assert popen.stdin is not None
data_bytes = data.encode(sys.__stdout__.encoding, "replace")
popen.stdin.write(data_bytes)
popen.stdin.close()
except OSError as e:
if e.errno == errno.ENOENT:
# pager command not found, fall back to internal pager
page_internal(data)
return
except OSError as e:
if e.errno != errno.EPIPE:
raise
while True:
try:
popen.wait()
except OSError as e:
if e.errno != errno.EINTR:
raise
else:
break
curses.doupdate()
# vim: sw=4 ts=4 sts=4 ai et