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Copy pathpager.py
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78 lines (68 loc) · 2.58 KB
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# 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
def get_pager_command(default: str = "less -rf") -> list[str]:
return shlex.split(os.environ.get("PAGER", default))
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
# `encoding` is new in py39
data_bytes = data.encode(sys.__stdout__.encoding, "replace") # type: ignore
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
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