DOC: extensions: add documentation for the bundled extensions

docs/source/config/extensions/autoreload.txt

@@ -0,0 +1,7 b''
+.. _extensions_autoreload:
+
+==========
+autoreload
+==========
+
+.. automodule:: IPython.extensions.autoreload

docs/source/config/extensions/parallelmagic.txt

@@ -0,0 +1,7 b''
+.. _extensions_parallelmagic:
+
+=============
+parallelmagic
+=============
+
+.. automodule:: IPython.extensions.parallelmagic

docs/source/config/extensions/sympyprinting.txt

@@ -0,0 +1,7 b''
+.. _extensions_sympyprinting:
+
+=============
+sympyprinting
+=============
+
+.. automodule:: IPython.extensions.sympyprinting

IPython/extensions/parallelmagic.py

@@ -1,299 +1,326 b''
 # encoding: utf-8
+"""
+=============
+parallelmagic
+=============
+
+Magic command interface for interactive parallel work.
+
+Usage
+=====
+
+``%autopx``
+
+@AUTOPX_DOC@
 
-"""Magic command interface for interactive parallel work."""
+``%px``
+
+@PX_DOC@
+
+``%result``
+
+@RESULT_DOC@
+
+"""
 
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2009  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 import ast
 import re
 
 from IPython.core.plugin import Plugin
 from IPython.utils.traitlets import Bool, Any, Instance
 from IPython.testing.skipdoctest import skip_doctest
 
 #-----------------------------------------------------------------------------
 # Definitions of magic functions for use with IPython
 #-----------------------------------------------------------------------------
 
 
 NO_ACTIVE_VIEW = """
 Use activate() on a DirectView object to activate it for magics.
 """
 
 
 class ParalleMagic(Plugin):
     """A component to manage the %result, %px and %autopx magics."""
 
     active_view = Instance('IPython.parallel.client.view.DirectView')
     verbose = Bool(False, config=True)
     shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
 
     def __init__(self, shell=None, config=None):
         super(ParalleMagic, self).__init__(shell=shell, config=config)
         self._define_magics()
         # A flag showing if autopx is activated or not
         self.autopx = False
 
     def _define_magics(self):
         """Define the magic functions."""
         self.shell.define_magic('result', self.magic_result)
         self.shell.define_magic('px', self.magic_px)
         self.shell.define_magic('autopx', self.magic_autopx)
 
     @skip_doctest
     def magic_result(self, ipself, parameter_s=''):
         """Print the result of command i on all engines..
 
         To use this a :class:`DirectView` instance must be created
         and then activated by calling its :meth:`activate` method.
 
         Then you can do the following::
 
             In [23]: %result
             Out[23]:
             <Results List>
             [0] In [6]: a = 10
             [1] In [6]: a = 10
 
             In [22]: %result 6
             Out[22]:
             <Results List>
             [0] In [6]: a = 10
             [1] In [6]: a = 10
         """
         if self.active_view is None:
             print NO_ACTIVE_VIEW
             return
 
         try:
             index = int(parameter_s)
         except:
             index = None
         result = self.active_view.get_result(index)
         return result
 
     @skip_doctest
     def magic_px(self, ipself, parameter_s=''):
         """Executes the given python command in parallel.
 
         To use this a :class:`DirectView` instance must be created
         and then activated by calling its :meth:`activate` method.
 
         Then you can do the following::
 
             In [24]: %px a = 5
             Parallel execution on engine(s): all
             Out[24]:
             <Results List>
             [0] In [7]: a = 5
             [1] In [7]: a = 5
         """
 
         if self.active_view is None:
             print NO_ACTIVE_VIEW
             return
         print "Parallel execution on engine(s): %s" % self.active_view.targets
         result = self.active_view.execute(parameter_s, block=False)
         if self.active_view.block:
             result.get()
             self._maybe_display_output(result)
 
     @skip_doctest
     def magic_autopx(self, ipself, parameter_s=''):
         """Toggles auto parallel mode.
 
         To use this a :class:`DirectView` instance must be created
         and then activated by calling its :meth:`activate` method. Once this
         is called, all commands typed at the command line are send to
         the engines to be executed in parallel. To control which engine
         are used, set the ``targets`` attributed of the multiengine client
         before entering ``%autopx`` mode.
 
         Then you can do the following::
 
             In [25]: %autopx
             %autopx to enabled
 
             In [26]: a = 10
             Parallel execution on engine(s): [0,1,2,3]
             In [27]: print a
             Parallel execution on engine(s): [0,1,2,3]
             [stdout:0] 10
             [stdout:1] 10
             [stdout:2] 10
             [stdout:3] 10
 
 
             In [27]: %autopx
             %autopx disabled
         """
         if self.autopx:
             self._disable_autopx()
         else:
             self._enable_autopx()
 
     def _enable_autopx(self):
         """Enable %autopx mode by saving the original run_cell and installing
         pxrun_cell.
         """
         if self.active_view is None:
             print NO_ACTIVE_VIEW
             return
 
         # override run_cell and run_code
         self._original_run_cell = self.shell.run_cell
         self.shell.run_cell = self.pxrun_cell
         self._original_run_code = self.shell.run_code
         self.shell.run_code = self.pxrun_code
 
         self.autopx = True
         print "%autopx enabled"
 
     def _disable_autopx(self):
         """Disable %autopx by restoring the original InteractiveShell.run_cell.
         """
         if self.autopx:
             self.shell.run_cell = self._original_run_cell
             self.shell.run_code = self._original_run_code
             self.autopx = False
             print "%autopx disabled"
 
     def _maybe_display_output(self, result):
         """Maybe display the output of a parallel result.
 
         If self.active_view.block is True, wait for the result
         and display the result.  Otherwise, this is a noop.
         """
         if isinstance(result.stdout, basestring):
             # single result
             stdouts = [result.stdout.rstrip()]
         else:
             stdouts = [s.rstrip() for s in result.stdout]
 
         targets = self.active_view.targets
         if isinstance(targets, int):
             targets = [targets]
         elif targets == 'all':
             targets = self.active_view.client.ids
 
         if any(stdouts):
             for eid,stdout in zip(targets, stdouts):
                 print '[stdout:%i]'%eid, stdout
 
 
     def pxrun_cell(self, raw_cell, store_history=True):
         """drop-in replacement for InteractiveShell.run_cell.
 
         This executes code remotely, instead of in the local namespace.
 
         See InteractiveShell.run_cell for details.
         """
 
         if (not raw_cell) or raw_cell.isspace():
             return
 
         ipself = self.shell
 
         with ipself.builtin_trap:
             cell = ipself.prefilter_manager.prefilter_lines(raw_cell)
 
             # Store raw and processed history
             if store_history:
                 ipself.history_manager.store_inputs(ipself.execution_count,
                                                   cell, raw_cell)
 
             # ipself.logger.log(cell, raw_cell)
 
             cell_name = ipself.compile.cache(cell, ipself.execution_count)
 
             try:
                 code_ast = ast.parse(cell, filename=cell_name)
             except (OverflowError, SyntaxError, ValueError, TypeError, MemoryError):
                 # Case 1
                 ipself.showsyntaxerror()
                 ipself.execution_count += 1
                 return None
             except NameError:
                 # ignore name errors, because we don't know the remote keys
                 pass
 
         if store_history:
             # Write output to the database. Does nothing unless
             # history output logging is enabled.
             ipself.history_manager.store_output(ipself.execution_count)
             # Each cell is a *single* input, regardless of how many lines it has
             ipself.execution_count += 1
 
         if re.search(r'get_ipython\(\)\.magic\(u?"%?autopx', cell):
             self._disable_autopx()
             return False
         else:
             try:
                 result = self.active_view.execute(cell, block=False)
             except:
                 ipself.showtraceback()
                 return True
             else:
                 if self.active_view.block:
                     try:
                         result.get()
                     except:
                         self.shell.showtraceback()
                         return True
                     else:
                         self._maybe_display_output(result)
                 return False
 
     def pxrun_code(self, code_obj):
         """drop-in replacement for InteractiveShell.run_code.
 
         This executes code remotely, instead of in the local namespace.
 
         See InteractiveShell.run_code for details.
         """
         ipself = self.shell
         # check code object for the autopx magic
         if 'get_ipython' in code_obj.co_names and 'magic' in code_obj.co_names and \
             any( [ isinstance(c, basestring) and 'autopx' in c for c in code_obj.co_consts ]):
             self._disable_autopx()
             return False
         else:
             try:
                 result = self.active_view.execute(code_obj, block=False)
             except:
                 ipself.showtraceback()
                 return True
             else:
                 if self.active_view.block:
                     try:
                         result.get()
                     except:
                         self.shell.showtraceback()
                         return True
                     else:
                         self._maybe_display_output(result)
                 return False
 
 
+__doc__ = __doc__.replace('@AUTOPX_DOC@',
+                          "        " + ParalleMagic.magic_autopx.__doc__)
+__doc__ = __doc__.replace('@PX_DOC@',
+                          "        " + ParalleMagic.magic_px.__doc__)
+__doc__ = __doc__.replace('@RESULT_DOC@',
+                          "        " + ParalleMagic.magic_result.__doc__)
 
 
 _loaded = False
 
 
 def load_ipython_extension(ip):
     """Load the extension in IPython."""
     global _loaded
     if not _loaded:
         plugin = ParalleMagic(shell=ip, config=ip.config)
         ip.plugin_manager.register_plugin('parallelmagic', plugin)
         _loaded = True
 

IPython/extensions/sympyprinting.py

@@ -1,91 +1,98 b''
-"""A print function that pretty prints sympy Basic objects.
+"""
+A print function that pretty prints sympy Basic objects.
+
+:moduleauthor: Brian Granger
+
+Usage
+=====
+
+Once the extension is loaded, Sympy Basic objects are automatically
+pretty-printed.
 
-Authors:
-* Brian Granger
 """
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2008-2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 
 from IPython.lib.latextools import latex_to_png
 from IPython.testing import decorators as dec
 # use @dec.skipif_not_sympy to skip tests requiring sympy
 
 try:
     from sympy import pretty, latex
 except ImportError:
     pass
 
 
 #-----------------------------------------------------------------------------
 # Definitions of magic functions for use with IPython
 #-----------------------------------------------------------------------------
 
 def print_basic_unicode(o, p, cycle):
     """A function to pretty print sympy Basic objects."""
     if cycle:
         return p.text('Basic(...)')
     out = pretty(o, use_unicode=True)
     if '\n' in out:
         p.text(u'\n')
     p.text(out)
 
 
 def print_png(o):
     """A function to display sympy expression using LaTex -> PNG."""
     s = latex(o, mode='inline')
     # mathtext does not understand certain latex flags, so we try to replace
     # them with suitable subs.
     s = s.replace('\\operatorname','')
     s = s.replace('\\overline', '\\bar')
     png = latex_to_png(s)
     return png
 
 
 def print_latex(o):
     """A function to generate the latex representation of sympy expressions."""
     s = latex(o, mode='equation', itex=True)
     s = s.replace('\\dag','\\dagger')
     return s
 
 
 _loaded = False
 
 def load_ipython_extension(ip):
     """Load the extension in IPython."""
     global _loaded
     if not _loaded:
         plaintext_formatter = ip.display_formatter.formatters['text/plain']
 
         for cls in (object, tuple, list, set, frozenset, dict, str):
             plaintext_formatter.for_type(cls, print_basic_unicode)
 
         plaintext_formatter.for_type_by_name(
             'sympy.core.basic', 'Basic', print_basic_unicode
         )
         plaintext_formatter.for_type_by_name(
             'sympy.matrices.matrices', 'Matrix', print_basic_unicode
         )
 
         png_formatter = ip.display_formatter.formatters['image/png']
 
         png_formatter.for_type_by_name(
             'sympy.core.basic', 'Basic', print_png
         )
 
         latex_formatter = ip.display_formatter.formatters['text/latex']
         latex_formatter.for_type_by_name(
             'sympy.core.basic', 'Basic', print_latex
         )
         latex_formatter.for_type_by_name(
             'sympy.matrices.matrices', 'Matrix', print_latex
         )
         _loaded = True
 

docs/source/config/extensions/index.txt

@@ -1,61 +1,71 b''
 .. _extensions_overview:
 
 ==================
 IPython extensions
 ==================
 
 Configuration files are just the first level of customization that IPython
 supports. The next level is that of extensions. An IPython extension is an
 importable Python module that has a a few special function. By defining these
 functions, users can customize IPython by accessing the actual runtime objects
 of IPython.  Here is a sample extension::
 
     # myextension.py
 
     def load_ipython_extension(ipython):
         # The ``ipython`` argument is the currently active 
         # :class:`InteractiveShell` instance that can be used in any way.
         # This allows you do to things like register new magics, plugins or
         # aliases.
 
     def unload_ipython_extension(ipython):
         # If you want your extension to be unloadable, put that logic here.
 
 This :func:`load_ipython_extension` function is called after your extension is
 imported and the currently active :class:`InteractiveShell` instance is passed
 as the only argument. You can do anything you want with IPython at that point.
 
 The :func:`load_ipython_extension` will be called again is you load or reload
 the extension again. It is up to the extension author to add code to manage
 that.
 
 You can put your extension modules anywhere you want, as long as they can be
 imported by Python's standard import mechanism. However, to make it easy to
 write extensions, you can also put your extensions in
 ``os.path.join(self.ipython_dir, 'extensions')``. This directory is added to
 ``sys.path`` automatically.
 
 Using extensions
 ================
 
 There are two ways you can tell IPython to use your extension:
 
 1. Listing it in a configuration file.
 2. Using the ``%load_ext`` magic function.
 
 To load an extension called :file:`myextension.py` add the following logic
 to your configuration file::
 
     c.InteractiveShellApp.extensions = [
         'myextension'
     ]
 
 To load that same extension at runtime, use the ``%load_ext`` magic:
 
 .. sourcecode:: ipython
 
     In [1]: %load_ext myextension
 
 To summarize, in conjunction with configuration files and profiles, IPython
 extensions give you complete and flexible control over your IPython
 setup.
+
+Extensions bundled with IPython
+===============================
+
+.. toctree::
+   :maxdepth: 1
+
+   autoreload
+   parallelmagic
+   sympyprinting

docs/source/config/index.txt

@@ -1,15 +1,15 b''
 .. _config_index:
 
 ===============================
 Configuration and customization
 ===============================
 
 .. toctree::
    :maxdepth: 2
 
    overview.txt
-   extensions.txt
+   extensions/index.txt
    plugins.txt
    ipython.txt
    editors.txt
    old.txt