import subprocess
 
 try: from shutils import which
 except ImportError: from distutils.spawn import find_executable as which
 
 PANDOC_PATH = which('pandoc')
 
 
 class Document(object):
    """A formatted document."""
 
    INPUT_FORMATS = (
       'native', 'markdown', 'markdown+lhs', 'rst',
       'rst+lhs', 'html', 'latex', 'latex+lhs'
    )
 
    OUTPUT_FORMATS = (
       'native', 'html', 'html+lhs', 's5', 'slidy',
       'docbook', 'opendocument', 'odt', 'epub',
       'latex', 'latex+lhs', 'context', 'texinfo',
       'man', 'markdown', 'markdown+lhs', 'plain',
       'rst', 'rst+lhs', 'mediawiki', 'rtf', 'html5'
    )
 
    SPECIAL_FORMATS = (
        ('html+mathjax', 'html', 'mathjax'),
        ('html5+mathjax', 'html5', 'mathjax'),
    )
 
    # TODO: Add odt, epub formats (requires file access, not stdout)
 
    def __init__(self):
       self._content = None
       self._format = None
       self._register_formats()
 
    @classmethod
    def _register_formats(cls):
       """Adds format properties."""
       for fmt in cls.OUTPUT_FORMATS:
          clean_fmt = fmt.replace('+', '_')
          setattr(cls, clean_fmt, property(
             (lambda x, fmt=fmt: cls._output(x, fmt)), # fget
             (lambda x, y, fmt=fmt: cls._input(x, y, fmt)))) # fset
       for fmt in cls.SPECIAL_FORMATS:
          clean_fmt = fmt[0].replace('+', '_')
          setattr(cls, clean_fmt, property(
             (lambda x, fmt=fmt: cls._output(x, fmt[1], fmt[2])), # fget
             (lambda x, y, fmt=fmt: cls._input(x, y, fmt[1], fmt[2])))) # fset
 
 
 
    def _input(self, value, format=None, modifiers=None):
       # format = format.replace('_', '+')
       self._content = value
       self._format = format
       self._modifiers = None
 
    def _output(self, format, modifiers=None):
       # print format
       if modifiers is None:
         cmdline = [PANDOC_PATH, '--from=%s' % self._format, '--to=%s' % format]
       else:
         cmdline = [PANDOC_PATH, '--from=%s' % self._format, '--to=%s' % format,
                    '--%s' % modifiers]
 
       p = subprocess.Popen(
          cmdline,
          stdin=subprocess.PIPE,
          stdout=subprocess.PIPE
       )
 
       return p.communicate(self._content)[0]