# -*- coding: utf-8 -*-
r"""
Sphinx directive to support embedded IPython code.

This directive allows pasting of entire interactive IPython sessions, prompts
and all, and their code will actually get re-executed at doc build time, with
all prompts renumbered sequentially. It also allows you to input code as a pure
python input by giving the argument python to the directive. The output looks
like an interactive ipython section.

To enable this directive, simply list it in your Sphinx ``conf.py`` file
(making sure the directory where you placed it is visible to sphinx, as is
needed for all Sphinx directives). For example, to enable syntax highlighting
and the IPython directive::

    extensions = ['IPython.sphinxext.ipython_console_highlighting',
                  'IPython.sphinxext.ipython_directive']

The IPython directive outputs code-blocks with the language 'ipython'. So
if you do not have the syntax highlighting extension enabled as well, then
all rendered code-blocks will be uncolored. By default this directive assumes
that your prompts are unchanged IPython ones, but this can be customized.
The configurable options that can be placed in conf.py are:

ipython_savefig_dir:
    The directory in which to save the figures. This is relative to the
    Sphinx source directory. The default is `html_static_path`.
ipython_rgxin:
    The compiled regular expression to denote the start of IPython input
    lines. The default is re.compile('In \[(\d+)\]:\s?(.*)\s*'). You
    shouldn't need to change this.
ipython_rgxout:
    The compiled regular expression to denote the start of IPython output
    lines. The default is re.compile('Out\[(\d+)\]:\s?(.*)\s*'). You
    shouldn't need to change this.
ipython_promptin:
    The string to represent the IPython input prompt in the generated ReST.
    The default is 'In [%d]:'. This expects that the line numbers are used
    in the prompt.
ipython_promptout:
    The string to represent the IPython prompt in the generated ReST. The
    default is 'Out [%d]:'. This expects that the line numbers are used
    in the prompt.
ipython_mplbackend:
    The string which specifies if the embedded Sphinx shell should import
    Matplotlib and set the backend. The value specifies a backend that is
    passed to `matplotlib.use()` before any lines in `ipython_execlines` are
    executed. If not specified in conf.py, then the default value of 'agg' is
    used. To use the IPython directive without matplotlib as a dependency, set
    the value to `None`. It may end up that matplotlib is still imported
    if the user specifies so in `ipython_execlines` or makes use of the
    @savefig pseudo decorator.
ipython_execlines:
    A list of strings to be exec'd in the embedded Sphinx shell. Typical
    usage is to make certain packages always available. Set this to an empty
    list if you wish to have no imports always available. If specified in
    conf.py as `None`, then it has the effect of making no imports available.
    If omitted from conf.py altogether, then the default value of
    ['import numpy as np', 'import matplotlib.pyplot as plt'] is used.
ipython_holdcount
    When the @suppress pseudo-decorator is used, the execution count can be
    incremented or not. The default behavior is to hold the execution count,
    corresponding to a value of `True`. Set this to `False` to increment
    the execution count after each suppressed command.

As an example, to use the IPython directive when `matplotlib` is not available,
one sets the backend to `None`::

    ipython_mplbackend = None

An example usage of the directive is:

.. code-block:: rst

    .. ipython::

        In [1]: x = 1

        In [2]: y = x**2

        In [3]: print(y)

See http://matplotlib.org/sampledoc/ipython_directive.html for additional
documentation.

Pseudo-Decorators
=================

Note: Only one decorator is supported per input. If more than one decorator
is specified, then only the last one is used.

In addition to the Pseudo-Decorators/options described at the above link,
several enhancements have been made. The directive will emit a message to the
console at build-time if code-execution resulted in an exception or warning.
You can suppress these on a per-block basis by specifying the :okexcept:
or :okwarning: options:

.. code-block:: rst

    .. ipython::
        :okexcept:
        :okwarning:

        In [1]: 1/0
        In [2]: # raise warning.

ToDo
----

- Turn the ad-hoc test() function into a real test suite.
- Break up ipython-specific functionality from matplotlib stuff into better
  separated code.

Authors
-------

- John D Hunter: orignal author.
- Fernando Perez: refactoring, documentation, cleanups, port to 0.11.
- VáclavŠmilauer <eudoxos-AT-arcig.cz>: Prompt generalizations.
- Skipper Seabold, refactoring, cleanups, pure python addition
"""

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------

# Stdlib
import atexit
import os
import re
import sys
import tempfile
import ast
import warnings
import shutil

# Third-party
from docutils.parsers.rst import directives
try:
	from sphinx.util.compat import Directive
except ImportError:
	from docutils.parsers.rst import Directive

# Our own
from traitlets.config import Config
from IPython import InteractiveShell
from IPython.core.profiledir import ProfileDir
from IPython.utils import io
from io import StringIO

#-----------------------------------------------------------------------------
# Globals
#-----------------------------------------------------------------------------
# for tokenizing blocks
COMMENT, INPUT, OUTPUT = list(range(3))

#-----------------------------------------------------------------------------
# Functions and class declarations
#-----------------------------------------------------------------------------


def block_parser(part, rgxin, rgxout, fmtin, fmtout):
	"""
    part is a string of ipython text, comprised of at most one
    input, one output, comments, and blank lines.  The block parser
    parses the text into a list of::

      blocks = [ (TOKEN0, data0), (TOKEN1, data1), ...]

    where TOKEN is one of [COMMENT | INPUT | OUTPUT ] and
    data is, depending on the type of token::

      COMMENT : the comment string

      INPUT: the (DECORATOR, INPUT_LINE, REST) where
         DECORATOR: the input decorator (or None)
         INPUT_LINE: the input as string (possibly multi-line)
         REST : any stdout generated by the input line (not OUTPUT)

      OUTPUT: the output string, possibly multi-line

    """
	block = []
	lines = part.split('\n')
	N = len(lines)
	i = 0
	decorator = None
	while 1:

		if i == N:
			# nothing left to parse -- the last line
			break

		line = lines[i]
		i += 1
		line_stripped = line.strip()
		if line_stripped.startswith('#'):
			block.append((COMMENT, line))
			continue

		if line_stripped.startswith('@'):
			# Here is where we assume there is, at most, one decorator.
			# Might need to rethink this.
			decorator = line_stripped
			continue

		# does this look like an input line?
		matchin = rgxin.match(line)
		if matchin:
			lineno, inputline = int(matchin.group(1)), matchin.group(2)

			# the ....: continuation string
			continuation = '   %s:' % ''.join(['.'] * (len(str(lineno)) + 2))
			Nc = len(continuation)
			# input lines can continue on for more than one line, if
			# we have a '\' line continuation char or a function call
			# echo line 'print'.  The input line can only be
			# terminated by the end of the block or an output line, so
			# we parse out the rest of the input line if it is
			# multiline as well as any echo text

			rest = []
			while i < N:

				# look ahead; if the next line is blank, or a comment, or
				# an output line, we're done

				nextline = lines[i]
				matchout = rgxout.match(nextline)
				#print "nextline=%s, continuation=%s, starts=%s"%(nextline, continuation, nextline.startswith(continuation))
				if matchout or nextline.startswith('#'):
					break
				elif nextline.startswith(continuation):
					# The default ipython_rgx* treat the space following the colon as optional.
					# However, If the space is there we must consume it or code
					# employing the cython_magic extension will fail to execute.
					#
					# This works with the default ipython_rgx* patterns,
					# If you modify them, YMMV.
					nextline = nextline[Nc:]
					if nextline and nextline[0] == ' ':
						nextline = nextline[1:]

					inputline += '\n' + nextline
				else:
					rest.append(nextline)
				i += 1

			block.append((INPUT, (decorator, inputline, '\n'.join(rest))))
			continue

		# if it looks like an output line grab all the text to the end
		# of the block
		matchout = rgxout.match(line)
		if matchout:
			lineno, output = int(matchout.group(1)), matchout.group(2)
			if i < N - 1:
				output = '\n'.join([output] + lines[i:])

			block.append((OUTPUT, output))
			break

	return block


class EmbeddedSphinxShell(object):
	"""An embedded IPython instance to run inside Sphinx"""

	def __init__(self, exec_lines=None):

		self.cout = StringIO()

		if exec_lines is None:
			exec_lines = []

		# Create config object for IPython
		config = Config()
		config.HistoryManager.hist_file = ':memory:'
		config.InteractiveShell.autocall = False
		config.InteractiveShell.autoindent = False
		config.InteractiveShell.colors = 'NoColor'

		# create a profile so instance history isn't saved
		tmp_profile_dir = tempfile.mkdtemp(prefix='profile_')
		profname = 'auto_profile_sphinx_build'
		pdir = os.path.join(tmp_profile_dir, profname)
		profile = ProfileDir.create_profile_dir(pdir)

		# Create and initialize global ipython, but don't start its mainloop.
		# This will persist across different EmbededSphinxShell instances.
		IP = InteractiveShell.instance(config=config, profile_dir=profile)
		atexit.register(self.cleanup)

		sys.stdout = self.cout
		sys.stderr = self.cout

		# For debugging, so we can see normal output, use this:
		#from IPython.utils.io import Tee
		#sys.stdout = Tee(self.cout, channel='stdout') # dbg
		#sys.stderr = Tee(self.cout, channel='stderr') # dbg

		# Store a few parts of IPython we'll need.
		self.IP = IP
		self.user_ns = self.IP.user_ns
		self.user_global_ns = self.IP.user_global_ns

		self.input = ''
		self.output = ''
		self.tmp_profile_dir = tmp_profile_dir

		self.is_verbatim = False
		self.is_doctest = False
		self.is_suppress = False

		# Optionally, provide more detailed information to shell.
		# this is assigned by the SetUp method of IPythonDirective
		# to point at itself.
		#
		# So, you can access handy things at self.directive.state
		self.directive = None

		# on the first call to the savefig decorator, we'll import
		# pyplot as plt so we can make a call to the plt.gcf().savefig
		self._pyplot_imported = False

		# Prepopulate the namespace.
		for line in exec_lines:
			self.process_input_line(line, store_history=False)

	def cleanup(self):
		shutil.rmtree(self.tmp_profile_dir, ignore_errors=True)

	def clear_cout(self):
		self.cout.seek(0)
		self.cout.truncate(0)

	def process_input_line(self, line, store_history=True):
		"""process the input, capturing stdout"""

		stdout = sys.stdout
		splitter = self.IP.input_splitter
		try:
			sys.stdout = self.cout
			splitter.push(line)
			more = splitter.push_accepts_more()
			if not more:
				source_raw = splitter.raw_reset()
				self.IP.run_cell(source_raw, store_history=store_history)
		finally:
			sys.stdout = stdout

	def process_image(self, decorator):
		"""
        # build out an image directive like
        # .. image:: somefile.png
        #    :width 4in
        #
        # from an input like
        # savefig somefile.png width=4in
        """
		savefig_dir = self.savefig_dir
		source_dir = self.source_dir
		saveargs = decorator.split(' ')
		filename = saveargs[1]
		# insert relative path to image file in source
		outfile = os.path.relpath(os.path.join(savefig_dir, filename), source_dir)

		imagerows = ['.. image:: %s' % outfile]

		for kwarg in saveargs[2:]:
			arg, val = kwarg.split('=')
			arg = arg.strip()
			val = val.strip()
			imagerows.append('   :%s: %s' % (arg, val))

		image_file = os.path.basename(outfile)  # only return file name
		image_directive = '\n'.join(imagerows)
		return image_file, image_directive

	# Callbacks for each type of token
	def process_input(self, data, input_prompt, lineno):
		"""
        Process data block for INPUT token.

        """
		decorator, input, rest = data
		image_file = None
		image_directive = None

		is_verbatim = decorator == '@verbatim' or self.is_verbatim
		is_doctest = (decorator is not None and decorator.startswith('@doctest')) or self.is_doctest
		is_suppress = decorator == '@suppress' or self.is_suppress
		is_okexcept = decorator == '@okexcept' or self.is_okexcept
		is_okwarning = decorator == '@okwarning' or self.is_okwarning
		is_savefig = decorator is not None and decorator.startswith('@savefig')

		input_lines = input.split('\n')
		if len(input_lines) > 1:
			if input_lines[-1] != "":
				input_lines.append('')  # make sure there's a blank line
				# so splitter buffer gets reset

		continuation = '   %s:' % ''.join(['.'] * (len(str(lineno)) + 2))

		if is_savefig:
			image_file, image_directive = self.process_image(decorator)

		ret = []
		is_semicolon = False

		# Hold the execution count, if requested to do so.
		if is_suppress and self.hold_count:
			store_history = False
		else:
			store_history = True

		# Note: catch_warnings is not thread safe
		with warnings.catch_warnings(record=True) as ws:
			for i, line in enumerate(input_lines):
				if line.endswith(';'):
					is_semicolon = True

				if i == 0:
					# process the first input line
					if is_verbatim:
						self.process_input_line('')
						self.IP.execution_count += 1  # increment it anyway
					else:
						# only submit the line in non-verbatim mode
						self.process_input_line(line, store_history=store_history)
					formatted_line = '%s %s' % (input_prompt, line)
				else:
					# process a continuation line
					if not is_verbatim:
						self.process_input_line(line, store_history=store_history)

					formatted_line = '%s %s' % (continuation, line)

				if not is_suppress:
					ret.append(formatted_line)

		if not is_suppress and len(rest.strip()) and is_verbatim:
			# The "rest" is the standard output of the input. This needs to be
			# added when in verbatim mode. If there is no "rest", then we don't
			# add it, as the new line will be added by the processed output.
			ret.append(rest)

		# Fetch the processed output. (This is not the submitted output.)
		self.cout.seek(0)
		processed_output = self.cout.read()
		if not is_suppress and not is_semicolon:
			#
			# In IPythonDirective.run, the elements of `ret` are eventually
			# combined such that '' entries correspond to newlines. So if
			# `processed_output` is equal to '', then the adding it to `ret`
			# ensures that there is a blank line between consecutive inputs
			# that have no outputs, as in:
			#
			#    In [1]: x = 4
			#
			#    In [2]: x = 5
			#
			# When there is processed output, it has a '\n' at the tail end. So
			# adding the output to `ret` will provide the necessary spacing
			# between consecutive input/output blocks, as in:
			#
			#   In [1]: x
			#   Out[1]: 5
			#
			#   In [2]: x
			#   Out[2]: 5
			#
			# When there is stdout from the input, it also has a '\n' at the
			# tail end, and so this ensures proper spacing as well. E.g.:
			#
			#   In [1]: print x
			#   5
			#
			#   In [2]: x = 5
			#
			# When in verbatim mode, `processed_output` is empty (because
			# nothing was passed to IP. Sometimes the submitted code block has
			# an Out[] portion and sometimes it does not. When it does not, we
			# need to ensure proper spacing, so we have to add '' to `ret`.
			# However, if there is an Out[] in the submitted code, then we do
			# not want to add a newline as `process_output` has stuff to add.
			# The difficulty is that `process_input` doesn't know if
			# `process_output` will be called---so it doesn't know if there is
			# Out[] in the code block. The requires that we include a hack in
			# `process_block`. See the comments there.
			#
			ret.append(processed_output)
		elif is_semicolon:
			# Make sure there is a newline after the semicolon.
			ret.append('')

		# context information
		filename = "Unknown"
		lineno = 0
		if self.directive.state:
			filename = self.directive.state.document.current_source
			lineno = self.directive.state.document.current_line

		# output any exceptions raised during execution to stdout
		# unless :okexcept: has been specified.
		if not is_okexcept and "Traceback" in processed_output:
			s = "\nException in %s at block ending on line %s\n" % (filename, lineno)
			s += "Specify :okexcept: as an option in the ipython:: block to suppress this message\n"
			sys.stdout.write('\n\n>>>' + ('-' * 73))
			sys.stdout.write(s)
			sys.stdout.write(processed_output)
			sys.stdout.write('<<<' + ('-' * 73) + '\n\n')

		# output any warning raised during execution to stdout
		# unless :okwarning: has been specified.
		if not is_okwarning:
			for w in ws:
				s = "\nWarning in %s at block ending on line %s\n" % (filename, lineno)
				s += "Specify :okwarning: as an option in the ipython:: block to suppress this message\n"
				sys.stdout.write('\n\n>>>' + ('-' * 73))
				sys.stdout.write(s)
				sys.stdout.write(('-' * 76) + '\n')
				s = warnings.formatwarning(w.message, w.category, w.filename, w.lineno, w.line)
				sys.stdout.write(s)
				sys.stdout.write('<<<' + ('-' * 73) + '\n')

		self.cout.truncate(0)

		return (ret, input_lines, processed_output, is_doctest, decorator, image_file, image_directive)

	def process_output(self, data, output_prompt, input_lines, output, is_doctest, decorator, image_file):
		"""
        Process data block for OUTPUT token.

        """
		# Recall: `data` is the submitted output, and `output` is the processed
		# output from `input_lines`.

		TAB = ' ' * 4

		if is_doctest and output is not None:

			found = output  # This is the processed output
			found = found.strip()
			submitted = data.strip()

			if self.directive is None:
				source = 'Unavailable'
				content = 'Unavailable'
			else:
				source = self.directive.state.document.current_source
				content = self.directive.content
				# Add tabs and join into a single string.
				content = '\n'.join([TAB + line for line in content])

			# Make sure the output contains the output prompt.
			ind = found.find(output_prompt)
			if ind < 0:
				e = (
				        'output does not contain output prompt\n\n'
				        'Document source: {0}\n\n'
				        'Raw content: \n{1}\n\n'
				        'Input line(s):\n{TAB}{2}\n\n'
				        'Output line(s):\n{TAB}{3}\n\n'
				)
				e = e.format(source, content, '\n'.join(input_lines), repr(found), TAB=TAB)
				raise RuntimeError(e)
			found = found[len(output_prompt):].strip()

			# Handle the actual doctest comparison.
			if decorator.strip() == '@doctest':
				# Standard doctest
				if found != submitted:
					e = (
					        'doctest failure\n\n'
					        'Document source: {0}\n\n'
					        'Raw content: \n{1}\n\n'
					        'On input line(s):\n{TAB}{2}\n\n'
					        'we found output:\n{TAB}{3}\n\n'
					        'instead of the expected:\n{TAB}{4}\n\n'
					)
					e = e.format(source, content, '\n'.join(input_lines), repr(found), repr(submitted), TAB=TAB)
					raise RuntimeError(e)
			else:
				self.custom_doctest(decorator, input_lines, found, submitted)

		# When in verbatim mode, this holds additional submitted output
		# to be written in the final Sphinx output.
		# https://github.com/ipython/ipython/issues/5776
		out_data = []

		is_verbatim = decorator == '@verbatim' or self.is_verbatim
		if is_verbatim and data.strip():
			# Note that `ret` in `process_block` has '' as its last element if
			# the code block was in verbatim mode. So if there is no submitted
			# output, then we will have proper spacing only if we do not add
			# an additional '' to `out_data`. This is why we condition on
			# `and data.strip()`.

			# The submitted output has no output prompt. If we want the
			# prompt and the code to appear, we need to join them now
			# instead of adding them separately---as this would create an
			# undesired newline. How we do this ultimately depends on the
			# format of the output regex. I'll do what works for the default
			# prompt for now, and we might have to adjust if it doesn't work
			# in other cases. Finally, the submitted output does not have
			# a trailing newline, so we must add it manually.
			out_data.append("{0} {1}\n".format(output_prompt, data))

		return out_data

	def process_comment(self, data):
		"""Process data fPblock for COMMENT token."""
		if not self.is_suppress:
			return [data]

	def save_image(self, image_file):
		"""
        Saves the image file to disk.
        """
		self.ensure_pyplot()
		command = 'plt.gcf().savefig("%s")' % image_file
		#print 'SAVEFIG', command  # dbg
		self.process_input_line('bookmark ipy_thisdir', store_history=False)
		self.process_input_line('cd -b ipy_savedir', store_history=False)
		self.process_input_line(command, store_history=False)
		self.process_input_line('cd -b ipy_thisdir', store_history=False)
		self.process_input_line('bookmark -d ipy_thisdir', store_history=False)
		self.clear_cout()

	def process_block(self, block):
		"""
        process block from the block_parser and return a list of processed lines
        """
		ret = []
		output = None
		input_lines = None
		lineno = self.IP.execution_count

		input_prompt = self.promptin % lineno
		output_prompt = self.promptout % lineno
		image_file = None
		image_directive = None

		found_input = False
		for token, data in block:
			if token == COMMENT:
				out_data = self.process_comment(data)
			elif token == INPUT:
				found_input = True
				(out_data, input_lines, output, is_doctest, decorator, image_file,
				 image_directive) = self.process_input(data, input_prompt, lineno)
			elif token == OUTPUT:
				if not found_input:

					TAB = ' ' * 4
					linenumber = 0
					source = 'Unavailable'
					content = 'Unavailable'
					if self.directive:
						linenumber = self.directive.state.document.current_line
						source = self.directive.state.document.current_source
						content = self.directive.content
						# Add tabs and join into a single string.
						content = '\n'.join([TAB + line for line in content])

					e = (
					        '\n\nInvalid block: Block contains an output prompt '
					        'without an input prompt.\n\n'
					        'Document source: {0}\n\n'
					        'Content begins at line {1}: \n\n{2}\n\n'
					        'Problematic block within content: \n\n{TAB}{3}\n\n'
					)
					e = e.format(source, linenumber, content, block, TAB=TAB)

					# Write, rather than include in exception, since Sphinx
					# will truncate tracebacks.
					sys.stdout.write(e)
					raise RuntimeError('An invalid block was detected.')

				out_data = self.process_output(data, output_prompt, input_lines, output, is_doctest, decorator, image_file)
				if out_data:
					# Then there was user submitted output in verbatim mode.
					# We need to remove the last element of `ret` that was
					# added in `process_input`, as it is '' and would introduce
					# an undesirable newline.
					assert (ret[-1] == '')
					del ret[-1]

			if out_data:
				ret.extend(out_data)

		# save the image files
		if image_file is not None:
			self.save_image(image_file)

		return ret, image_directive

	def ensure_pyplot(self):
		"""
        Ensures that pyplot has been imported into the embedded IPython shell.

        Also, makes sure to set the backend appropriately if not set already.

        """
		# We are here if the @figure pseudo decorator was used. Thus, it's
		# possible that we could be here even if python_mplbackend were set to
		# `None`. That's also strange and perhaps worthy of raising an
		# exception, but for now, we just set the backend to 'agg'.

		if not self._pyplot_imported:
			if 'matplotlib.backends' not in sys.modules:
				# Then ipython_matplotlib was set to None but there was a
				# call to the @figure decorator (and ipython_execlines did
				# not set a backend).
				#raise Exception("No backend was set, but @figure was used!")
				import matplotlib
				matplotlib.use('agg')

			# Always import pyplot into embedded shell.
			self.process_input_line('import matplotlib.pyplot as plt', store_history=False)
			self._pyplot_imported = True

	def process_pure_python(self, content):
		"""
        content is a list of strings. it is unedited directive content

        This runs it line by line in the InteractiveShell, prepends
        prompts as needed capturing stderr and stdout, then returns
        the content as a list as if it were ipython code
        """
		output = []
		savefig = False  # keep up with this to clear figure
		multiline = False  # to handle line continuation
		multiline_start = None
		fmtin = self.promptin

		ct = 0

		for lineno, line in enumerate(content):

			line_stripped = line.strip()
			if not len(line):
				output.append(line)
				continue

			# handle decorators
			if line_stripped.startswith('@'):
				output.extend([line])
				if 'savefig' in line:
					savefig = True  # and need to clear figure
				continue

			# handle comments
			if line_stripped.startswith('#'):
				output.extend([line])
				continue

			# deal with lines checking for multiline
			continuation = u'   %s:' % ''.join(['.'] * (len(str(ct)) + 2))
			if not multiline:
				modified = u"%s %s" % (fmtin % ct, line_stripped)
				output.append(modified)
				ct += 1
				try:
					ast.parse(line_stripped)
					output.append(u'')
				except Exception:  # on a multiline
					multiline = True
					multiline_start = lineno
			else:  # still on a multiline
				modified = u'%s %s' % (continuation, line)
				output.append(modified)

				# if the next line is indented, it should be part of multiline
				if len(content) > lineno + 1:
					nextline = content[lineno + 1]
					if len(nextline) - len(nextline.lstrip()) > 3:
						continue
				try:
					mod = ast.parse('\n'.join(content[multiline_start:lineno + 1]))
					if isinstance(mod.body[0], ast.FunctionDef):
						# check to see if we have the whole function
						for element in mod.body[0].body:
							if isinstance(element, ast.Return):
								multiline = False
					else:
						output.append(u'')
						multiline = False
				except Exception:
					pass

			if savefig:  # clear figure if plotted
				self.ensure_pyplot()
				self.process_input_line('plt.clf()', store_history=False)
				self.clear_cout()
				savefig = False

		return output

	def custom_doctest(self, decorator, input_lines, found, submitted):
		"""
        Perform a specialized doctest.

        """
		from .custom_doctests import doctests

		args = decorator.split()
		doctest_type = args[1]
		if doctest_type in doctests:
			doctests[doctest_type](self, args, input_lines, found, submitted)
		else:
			e = "Invalid option to @doctest: {0}".format(doctest_type)
			raise Exception(e)


class IPythonDirective(Directive):

	has_content = True
	required_arguments = 0
	optional_arguments = 4  # python, suppress, verbatim, doctest
	final_argumuent_whitespace = True
	option_spec = {
	        'python': directives.unchanged,
	        'suppress': directives.flag,
	        'verbatim': directives.flag,
	        'doctest': directives.flag,
	        'okexcept': directives.flag,
	        'okwarning': directives.flag
	}

	shell = None

	seen_docs = set()

	def get_config_options(self):
		# contains sphinx configuration variables
		config = self.state.document.settings.env.config

		# get config variables to set figure output directory
		outdir = self.state.document.settings.env.app.outdir
		savefig_dir = config.ipython_savefig_dir
		source_dir = os.path.dirname(self.state.document.current_source)
		if savefig_dir is None:
			savefig_dir = config.html_static_path or '_static'
		if isinstance(savefig_dir, list):
			savefig_dir = os.path.join(*savefig_dir)
		savefig_dir = os.path.join(outdir, savefig_dir)

		# get regex and prompt stuff
		rgxin = config.ipython_rgxin
		rgxout = config.ipython_rgxout
		promptin = config.ipython_promptin
		promptout = config.ipython_promptout
		mplbackend = config.ipython_mplbackend
		exec_lines = config.ipython_execlines
		hold_count = config.ipython_holdcount

		return (savefig_dir, source_dir, rgxin, rgxout, promptin, promptout, mplbackend, exec_lines, hold_count)

	def setup(self):
		# Get configuration values.
		(savefig_dir, source_dir, rgxin, rgxout, promptin, promptout, mplbackend, exec_lines, hold_count) = self.get_config_options()

		if self.shell is None:
			# We will be here many times.  However, when the
			# EmbeddedSphinxShell is created, its interactive shell member
			# is the same for each instance.

			if mplbackend and 'matplotlib.backends' not in sys.modules:
				import matplotlib
				matplotlib.use(mplbackend)

			# Must be called after (potentially) importing matplotlib and
			# setting its backend since exec_lines might import pylab.
			self.shell = EmbeddedSphinxShell(exec_lines)

			# Store IPython directive to enable better error messages
			self.shell.directive = self

		# reset the execution count if we haven't processed this doc
		#NOTE: this may be borked if there are multiple seen_doc tmp files
		#check time stamp?
		if not self.state.document.current_source in self.seen_docs:
			self.shell.IP.history_manager.reset()
			self.shell.IP.execution_count = 1
			self.seen_docs.add(self.state.document.current_source)

		# and attach to shell so we don't have to pass them around
		self.shell.rgxin = rgxin
		self.shell.rgxout = rgxout
		self.shell.promptin = promptin
		self.shell.promptout = promptout
		self.shell.savefig_dir = savefig_dir
		self.shell.source_dir = source_dir
		self.shell.hold_count = hold_count

		# setup bookmark for saving figures directory
		self.shell.process_input_line('bookmark ipy_savedir %s' % savefig_dir, store_history=False)
		self.shell.clear_cout()

		return rgxin, rgxout, promptin, promptout

	def teardown(self):
		# delete last bookmark
		self.shell.process_input_line('bookmark -d ipy_savedir', store_history=False)
		self.shell.clear_cout()

	def run(self):
		debug = False

		#TODO, any reason block_parser can't be a method of embeddable shell
		# then we wouldn't have to carry these around
		rgxin, rgxout, promptin, promptout = self.setup()

		options = self.options
		self.shell.is_suppress = 'suppress' in options
		self.shell.is_doctest = 'doctest' in options
		self.shell.is_verbatim = 'verbatim' in options
		self.shell.is_okexcept = 'okexcept' in options
		self.shell.is_okwarning = 'okwarning' in options

		# handle pure python code
		if 'python' in self.arguments:
			content = self.content
			self.content = self.shell.process_pure_python(content)

		# parts consists of all text within the ipython-block.
		# Each part is an input/output block.
		parts = '\n'.join(self.content).split('\n\n')

		lines = ['.. code-block:: ipython', '']
		figures = []

		for part in parts:
			block = block_parser(part, rgxin, rgxout, promptin, promptout)
			if len(block):
				rows, figure = self.shell.process_block(block)
				for row in rows:
					lines.extend(['   {0}'.format(line) for line in row.split('\n')])

				if figure is not None:
					figures.append(figure)

		for figure in figures:
			lines.append('')
			lines.extend(figure.split('\n'))
			lines.append('')

		if len(lines) > 2:
			if debug:
				print('\n'.join(lines))
			else:
				# This has to do with input, not output. But if we comment
				# these lines out, then no IPython code will appear in the
				# final output.
				self.state_machine.insert_input(lines, self.state_machine.input_lines.source(0))

		# cleanup
		self.teardown()

		return []


# Enable as a proper Sphinx directive
def setup(app):
	setup.app = app

	app.add_directive('ipython', IPythonDirective)
	app.add_config_value('ipython_savefig_dir', None, 'env')
	app.add_config_value('ipython_rgxin', re.compile(r'In \[(\d+)\]:\s?(.*)\s*'), 'env')
	app.add_config_value('ipython_rgxout', re.compile(r'Out\[(\d+)\]:\s?(.*)\s*'), 'env')
	app.add_config_value('ipython_promptin', 'In [%d]:', 'env')
	app.add_config_value('ipython_promptout', 'Out[%d]:', 'env')

	# We could just let matplotlib pick whatever is specified as the default
	# backend in the matplotlibrc file, but this would cause issues if the
	# backend didn't work in headless environments. For this reason, 'agg'
	# is a good default backend choice.
	app.add_config_value('ipython_mplbackend', 'agg', 'env')

	# If the user sets this config value to `None`, then EmbeddedSphinxShell's
	# __init__ method will treat it as [].
	execlines = ['import numpy as np', 'import matplotlib.pyplot as plt']
	app.add_config_value('ipython_execlines', execlines, 'env')

	app.add_config_value('ipython_holdcount', True, 'env')

	metadata = {'parallel_read_safe': True, 'parallel_write_safe': True}
	return metadata


# Simple smoke test, needs to be converted to a proper automatic test.
def test():

	examples = [
	        r"""
In [9]: pwd
Out[9]: '/home/jdhunter/py4science/book'

In [10]: cd bookdata/
/home/jdhunter/py4science/book/bookdata

In [2]: from pylab import *

In [2]: ion()

In [3]: im = imread('stinkbug.png')

@savefig mystinkbug.png width=4in
In [4]: imshow(im)
Out[4]: <matplotlib.image.AxesImage object at 0x39ea850>

""",
	        r"""

In [1]: x = 'hello world'

# string methods can be
# used to alter the string
@doctest
In [2]: x.upper()
Out[2]: 'HELLO WORLD'

@verbatim
In [3]: x.st<TAB>
x.startswith  x.strip
""",
	        r"""

In [130]: url = 'http://ichart.finance.yahoo.com/table.csv?s=CROX\
   .....: &d=9&e=22&f=2009&g=d&a=1&br=8&c=2006&ignore=.csv'

In [131]: print url.split('&')
['http://ichart.finance.yahoo.com/table.csv?s=CROX', 'd=9', 'e=22', 'f=2009', 'g=d', 'a=1', 'b=8', 'c=2006', 'ignore=.csv']

In [60]: import urllib

""",
	        r"""\

In [133]: import numpy.random

@suppress
In [134]: numpy.random.seed(2358)

@doctest
In [135]: numpy.random.rand(10,2)
Out[135]:
array([[ 0.64524308,  0.59943846],
       [ 0.47102322,  0.8715456 ],
       [ 0.29370834,  0.74776844],
       [ 0.99539577,  0.1313423 ],
       [ 0.16250302,  0.21103583],
       [ 0.81626524,  0.1312433 ],
       [ 0.67338089,  0.72302393],
       [ 0.7566368 ,  0.07033696],
       [ 0.22591016,  0.77731835],
       [ 0.0072729 ,  0.34273127]])

""",
	        r"""
In [106]: print x
jdh

In [109]: for i in range(10):
   .....:     print i
   .....:
   .....:
0
1
2
3
4
5
6
7
8
9
""",
	        r"""

In [144]: from pylab import *

In [145]: ion()

# use a semicolon to suppress the output
@savefig test_hist.png width=4in
In [151]: hist(np.random.randn(10000), 100);


@savefig test_plot.png width=4in
In [151]: plot(np.random.randn(10000), 'o');
   """,
	        r"""
# use a semicolon to suppress the output
In [151]: plt.clf()

@savefig plot_simple.png width=4in
In [151]: plot([1,2,3])

@savefig hist_simple.png width=4in
In [151]: hist(np.random.randn(10000), 100);

""",
	        r"""
# update the current fig
In [151]: ylabel('number')

In [152]: title('normal distribution')


@savefig hist_with_text.png
In [153]: grid(True)

@doctest float
In [154]: 0.1 + 0.2
Out[154]: 0.3

@doctest float
In [155]: np.arange(16).reshape(4,4)
Out[155]:
array([[ 0,  1,  2,  3],
       [ 4,  5,  6,  7],
       [ 8,  9, 10, 11],
       [12, 13, 14, 15]])

In [1]: x = np.arange(16, dtype=float).reshape(4,4)

In [2]: x[0,0] = np.inf

In [3]: x[0,1] = np.nan

@doctest float
In [4]: x
Out[4]:
array([[ inf,  nan,   2.,   3.],
       [  4.,   5.,   6.,   7.],
       [  8.,   9.,  10.,  11.],
       [ 12.,  13.,  14.,  15.]])


        """,
	]
	# skip local-file depending first example:
	examples = examples[1:]

	#ipython_directive.DEBUG = True  # dbg
	#options = dict(suppress=True)  # dbg
	options = dict()
	for example in examples:
		content = example.split('\n')
		IPythonDirective(
		        'debug',
		        arguments=None,
		        options=options,
		        content=content,
		        lineno=0,
		        content_offset=None,
		        block_text=None,
		        state=None,
		        state_machine=None,
		)


# Run test suite as a script
if __name__ == '__main__':
	if not os.path.isdir('_static'):
		os.mkdir('_static')
	test()
	print('All OK? Check figures in _static/')
