old_contents: # Copyright © 2015-2021 Jakub Wilk <jwilk@jwilk.net>
  #
  # 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.
  
  '''
  automatic pager
  '''
  
  import contextlib
  import io
  import os
  import shutil
  import subprocess as ipc
  import sys
  
  def _find_command(command):
      if shutil.which(command):
          return command
  
  def get_default_pager():
      # Use "pager" if it exist:
      # https://www.debian.org/doc/debian-policy/ch-customized-programs.html#editors-and-pagers
      # Fall back to "more", which is in POSIX.
      return (
          _find_command('pager')
          or 'more'
      )
  
  @contextlib.contextmanager
  def autopager(*, raw_control_chars=False):
      if not sys.stdout.isatty():
          yield
          return
      cmdline = os.environ.get('PAGER') or get_default_pager()
      if cmdline == 'cat':
          yield
          return
      env = None
      if 'LESS' not in os.environ:
          lessopt = '-FX'
          if raw_control_chars:
              lessopt += 'R'
          env = dict(env or os.environ, LESS=lessopt)
      if raw_control_chars and ('LV' not in os.environ):
          env = dict(env or os.environ, LV='-c')
      orig_stdout = sys.stdout
      try:
          with ipc.Popen(cmdline, shell=True, stdin=ipc.PIPE, env=env) as pager:
              sys.stdout = io.TextIOWrapper(pager.stdin,
                  encoding=orig_stdout.encoding,
              )
              try:
                  yield
              finally:
                  sys.stdout.close()
      finally:
          sys.stdout = orig_stdout
  
  __all__ = [
      'autopager',
  ]
  
  # vim:ts=4 sts=4 sw=4 et
  
new_contents: # Copyright © 2015-2022 Jakub Wilk <jwilk@jwilk.net>
  #
  # 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.
  
  '''
  automatic pager
  '''
  
  import contextlib
  import io
  import os
  import shutil
  import subprocess as ipc
  import sys
  
  def _find_command(command):
      if shutil.which(command):
          return command
  
  def get_default_pager():
      # Use "pager" if it exist:
      # https://www.debian.org/doc/debian-policy/ch-customized-programs.html#editors-and-pagers
      # Fall back to "more", which is in POSIX.
      return (
          _find_command('pager')
          or 'more'
      )
  
  @contextlib.contextmanager
  def autopager(*, raw_control_chars=False):
      if not sys.stdout.isatty():
          yield
          return
      cmdline = os.environ.get('PAGER') or get_default_pager()
      if cmdline == 'cat':
          yield
          return
      env = None
      if 'LESS' not in os.environ:
          lessopt = '-FX'
          if raw_control_chars:
              lessopt += 'R'
          env = dict(env or os.environ, LESS=lessopt)
      if raw_control_chars and ('LV' not in os.environ):
          env = dict(env or os.environ, LV='-c')
      orig_stdout = sys.stdout
      try:
          with ipc.Popen(cmdline, shell=True, stdin=ipc.PIPE, env=env) as pager:
              sys.stdout = io.TextIOWrapper(pager.stdin,
                  encoding=orig_stdout.encoding,
              )
              try:
                  yield
              finally:
                  sys.stdout.close()
      finally:
          sys.stdout = orig_stdout
  
  __all__ = [
      'autopager',
  ]
  
  # vim:ts=4 sts=4 sw=4 et
  
subject: update copyright notice.