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]