Add `ipython_execlines` option to IPython directive.

IPython/sphinxext/ipython_directive.py

@@ -1,839 +1,845 b''
 # -*- coding: utf-8 -*-
 """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']
 
 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 for each code-block. If `None`, or equal
     to '' or 'None', then `matplotlib` will not be automatically imported. If
     not `None`, then the value should specify a backend that is passed to
     `matplotlib.use()`. The default value is 'agg'.
+ipython_execlines:
+    A list of strings to be exec'd for each embedded Sphinx shell.  Typical
+    usage is to make certain packages always available.  If None, then
+    `['import numpy as np', 'from pylab import *']` is used. Set this to an
+    empty list if you wish to have no imports always available.
 
 As an example, to use the IPython directive when `matplotlib` is not available,
 one sets the backend to `None`::
 
     ipython_mplbacked = None
 
 
 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
 """
 from __future__ import print_function
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 # Stdlib
 import os
 import re
 import sys
 import tempfile
 import ast
 
 # To keep compatibility with various python versions
 try:
     from hashlib import md5
 except ImportError:
     from md5 import md5
 
 # Third-party
 import sphinx
 from docutils.parsers.rst import directives
 from docutils import nodes
 from sphinx.util.compat import Directive
 
 # Our own
 from IPython import Config, InteractiveShell
 from IPython.core.profiledir import ProfileDir
 from IPython.utils import io
 from IPython.utils.py3compat import PY3
 
 if PY3:
     from io import StringIO
 else:
     from StringIO import StringIO
 
 #-----------------------------------------------------------------------------
 # Globals
 #-----------------------------------------------------------------------------
 # for tokenizing blocks
 COMMENT, INPUT, OUTPUT =  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 ouput, 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('@'):
             # we're assuming at most one decorator -- may need to
             # rethink
             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):
                     inputline += '\n' + nextline[Nc:]
                 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):
+    def __init__(self, exec_lines=None):
 
         self.cout = StringIO()
 
+        if exec_lines is None:
+            exec_lines = ['import numpy as np', 'from pylab import *']
 
         # Create config object for IPython
         config = Config()
         config.Global.display_banner = False
-        config.Global.exec_lines = ['import numpy as np',
-                                    'from pylab import *'
-                                    ]
+        config.Global.exec_lines = exec_lines
         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 ipython, but don't start its mainloop
         IP = InteractiveShell.instance(config=config, profile_dir=profile)
         # io.stdout redirect must be done *after* instantiating InteractiveShell
         io.stdout = self.cout
         io.stderr = self.cout
 
         # For debugging, so we can see normal output, use this:
         #from IPython.utils.io import Tee
         #io.stdout = Tee(self.cout, channel='stdout') # dbg
         #io.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.is_verbatim = False
         self.is_doctest = False
         self.is_suppress = False
 
         # 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
 
     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"""
         #print "input='%s'"%self.input
         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.source_raw_reset()[1]
                 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
         #print 'INPUT:', data  # dbg
         is_verbatim = decorator=='@verbatim' or self.is_verbatim
         is_doctest = decorator=='@doctest' or self.is_doctest
         is_suppress = decorator=='@suppress' or self.is_suppress
         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))
         Nc = len(continuation)
 
         if is_savefig:
             image_file, image_directive = self.process_image(decorator)
 
         ret = []
         is_semicolon = False
 
         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=True)
                 formatted_line = '%s %s'%(input_prompt, line)
             else:
                 # process a continuation line
                 if not is_verbatim:
                     self.process_input_line(line, store_history=True)
 
                 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, which needs to be added in
             # verbatim mode
             ret.append(rest)
 
         self.cout.seek(0)
         output = self.cout.read()
         if not is_suppress and not is_semicolon:
             ret.append(output)
         elif is_semicolon: # get spacing right
             ret.append('')
 
         self.cout.truncate(0)
         return (ret, input_lines, output, is_doctest, image_file,
                     image_directive)
         #print 'OUTPUT', output  # dbg
 
     def process_output(self, data, output_prompt,
                        input_lines, output, is_doctest, image_file):
         """Process data block for OUTPUT token."""
         if is_doctest:
             submitted = data.strip()
             found = output
             if found is not None:
                 found = found.strip()
 
                 # XXX - fperez: in 0.11, 'output' never comes with the prompt
                 # in it, just the actual output text.  So I think all this code
                 # can be nuked...
 
                 # the above comment does not appear to be accurate... (minrk)
 
                 ind = found.find(output_prompt)
                 if ind<0:
                     e='output prompt="%s" does not match out line=%s' % \
                        (output_prompt, found)
                     raise RuntimeError(e)
                 found = found[len(output_prompt):].strip()
 
                 if found!=submitted:
                     e = ('doctest failure for input_lines="%s" with '
                          'found_output="%s" and submitted output="%s"' %
                          (input_lines, found, submitted) )
                     raise RuntimeError(e)
                 #print 'doctest PASSED for input_lines="%s" with found_output="%s" and submitted output="%s"'%(input_lines, found, submitted)
 
     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
 
         for token, data in block:
             if token==COMMENT:
                 out_data = self.process_comment(data)
             elif token==INPUT:
                 (out_data, input_lines, output, is_doctest, image_file,
                     image_directive) = \
                           self.process_input(data, input_prompt, lineno)
             elif token==OUTPUT:
                 out_data = \
                     self.process_output(data, output_prompt,
                                         input_lines, output, is_doctest,
                                         image_file)
             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):
         if self._pyplot_imported:
             return
         self.process_input_line('import matplotlib.pyplot as plt',
                                 store_history=False)
 
     def process_pure_python(self, content):
         """
         content is a list of strings. it is unedited directive conent
 
         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
 
 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,
                   }
 
     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
         confdir = self.state.document.settings.env.app.confdir
         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
         if isinstance(savefig_dir, list):
             savefig_dir = savefig_dir[0] # safe to assume only one path?
         savefig_dir = os.path.join(confdir, 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
 
         return (savefig_dir, source_dir, rgxin, rgxout,
-                promptin, promptout, mplbackend)
+                promptin, promptout, mplbackend, exec_lines)
 
     def setup(self):
         # Get configuration values.
-        (savefig_dir, source_dir, rgxin, rgxout,
-            promptin, promptout, mplbackend) = self.get_config_options()
+        (savefig_dir, source_dir, rgxin, rgxout, promptin,
+         promptout, mplbackend, exec_lines) = self.get_config_options()
 
         if self.shell is None:
-            self.shell = EmbeddedSphinxShell()
+            self.shell = EmbeddedSphinxShell(exec_lines)
             if mplbackend:
                 # Each ipython code-block is run in a separate process.
                 import matplotlib
                 matplotlib.use(mplbackend)
 
         # 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
 
         # 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
 
         # handle pure python code
         if 'python' in self.arguments:
             content = self.content
             self.content = self.shell.process_pure_python(content)
 
         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(['   %s'%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 is what makes the lines appear in the final output.
                 self.state_machine.insert_input(
                     lines, self.state_machine.input_lines.source(0))
 
         # cleanup
         self.teardown()
 
         return []#, imgnode]
 
 # 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('In \[(\d+)\]:\s?(.*)\s*'), 'env')
     app.add_config_value('ipython_rgxout',
                          re.compile('Out\[(\d+)\]:\s?(.*)\s*'), 'env')
     app.add_config_value('ipython_promptin', 'In [%d]:', 'env')
     app.add_config_value('ipython_promptout', 'Out[%d]:', 'env')
     app.add_config_value('ipython_mplbackend', 'agg', 'env')
-
+    app.add_config_value('ipython_execlines', None, 'env')
 
 # 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)
 
         """,
         ]
     # 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/')