old_contents: # Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011, 2012  Andrey Golovizin
  #
  # 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.
  
  
  import pybtex.io
  from pybtex.textutils import capfirst, add_period
  
  
  strict = False
  error_code = 0
  
  
  def enable_strict_mode(enable=True):
      global strict
      strict = enable
  
  
  def format_error(exception, prefix='ERROR: '):
      lines = []
      context = exception.get_context()
      if context:
          lines += (context.splitlines())
      lines.append(u'{0}{1}'.format(prefix, capfirst(add_period(unicode(exception)))))
      filename = exception.get_filename()
      if filename:
          lines = (
              u'{0}: {1}'.format(filename, line)
              for line in lines
          )
      return '\n'.join(lines)
  
  
  def print_error(exception, prefix='ERROR: '):
      print >>pybtex.io.stderr, format_error(exception, prefix)
  
  
  def report_error(exception):
      global error_code
  
      if strict:
          raise exception
      else:
          print_error(exception, 'WARNING: ')
          error_code = 2
  
new_contents: # Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011, 2012  Andrey Golovizin
  #
  # 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.
  
  from StringIO import StringIO
  from contextlib import contextmanager
  
  import pybtex.io
  from pybtex.textutils import capfirst, add_period
  
  
  strict = False
  error_code = 0
  stderr = pybtex.io.stderr
  
  
  def enable_strict_mode(enable=True):
      global strict
      strict = enable
  
  
  @contextmanager
  def capture():
      global stderr
      orig_stderr = stderr
      stderr = StringIO()
      try:
          yield stderr
      finally:
          stderr = orig_stderr
  
  
  def format_error(exception, prefix='ERROR: '):
      lines = []
      context = exception.get_context()
      if context:
          lines += (context.splitlines())
      lines.append(u'{0}{1}'.format(prefix, capfirst(add_period(unicode(exception)))))
      filename = exception.get_filename()
      if filename:
          lines = (
              u'{0}: {1}'.format(filename, line)
              for line in lines
          )
      return '\n'.join(lines)
  
  
  def print_error(exception, prefix='ERROR: '):
      print >>stderr, format_error(exception, prefix)
  
  
  def report_error(exception):
      global error_code
  
      if strict:
          raise exception
      else:
          print_error(exception, 'WARNING: ')
          error_code = 2
  
subject: Add pybtex.errors.capture() context manager.