Add a cross reference to discussion of ipython directory location.

docs/source/config/ipython.txt

@@ -1,136 +1,136 b''
 .. _configuring_ipython:
 
 ===========================================================
 Configuring the :command:`ipython` command line application
 ===========================================================
 
 This section contains information about how to configure the
 :command:`ipython` command line application. See the :ref:`configuration
 overview <config_overview>` for a more general description of the
 configuration system and configuration file format.
 
 The default configuration file for the :command:`ipython` command line application
 is :file:`ipython_config.py`.  By setting the attributes in this file, you
 can configure the application.   A sample is provided in
 :mod:`IPython.config.default.ipython_config`.  Simply copy this file to your
-IPython directory to start using it.
+:ref:`IPython directory <ipython_dir>` to start using it.
 
 Most configuration attributes that this file accepts are associated with
 classes that are subclasses of :class:`~IPython.core.component.Component`.
 
 A few configuration attributes are not associated with a particular 
 :class:`~IPython.core.component.Component` subclass.  These are application
 wide configuration attributes and are stored in the ``Global`` 
 sub-configuration section.  We begin with a description of these 
 attributes.
 
 Global configuration
 ====================
 
 Assuming that your configuration file has the following at the top::
 
     c = get_config()
 
 the following attributes can be set in the ``Global`` section.
 
 :attr:`c.Global.display_banner`
     A boolean that determined if the banner is printer when :command:`ipython`
     is started.
 
 :attr:`c.Global.classic`
     A boolean that determines if IPython starts in "classic" mode.  In this
     mode, the prompts and everything mimic that of the normal :command:`python`
     shell
 
 :attr:`c.Global.nosep`
     A boolean that determines if there should be no blank lines between
     prompts.
 
 :attr:`c.Global.log_level`
     An integer that sets the detail of the logging level during the startup
     of :command:`ipython`.  The default is 30 and the possible values are
     (0, 10, 20, 30, 40, 50).  Higher is quieter and lower is more verbose.
 
 :attr:`c.Global.extensions`
     A list of strings, each of which is an importable IPython extension. An
     IPython extension is a regular Python module or package that has a
     :func:`load_ipython_extension(ip)` method. This method gets called when
     the extension is loaded with the currently running
     :class:`~IPython.core.iplib.InteractiveShell` as its only argument. You
     can put your extensions anywhere they can be imported but we add the
     :file:`extensions` subdirectory of the ipython directory to ``sys.path``
     during extension loading, so you can put them there as well. Extensions
     are not executed in the user's interactive namespace and they must be pure
     Python code. Extensions are the recommended way of customizing
     :command:`ipython`. Extensions can provide an
     :func:`unload_ipython_extension` that will be called when the extension is
     unloaded.
 
 :attr:`c.Global.exec_lines`
     A list of strings, each of which is Python code that is run in the user's
     namespace after IPython start. These lines can contain full IPython syntax
     with magics, etc.
 
 :attr:`c.Global.exec_files`
     A list of strings, each of which is the full pathname of a ``.py`` or
     ``.ipy`` file that will be executed as IPython starts. These files are run
     in IPython in the user's namespace. Files with a ``.py`` extension need to
     be pure Python. Files with a ``.ipy`` extension can have custom IPython
     syntax (magics, etc.). These files need to be in the cwd, the ipythondir
     or be absolute paths.
 
 Classes that can be configured
 ==============================
 
 The following classes can also be configured in the configuration file for
 :command:`ipython`:
 
 * :class:`~IPython.core.iplib.InteractiveShell`
 
 * :class:`~IPython.core.prefilter.PrefilterManager`
 
 * :class:`~IPython.core.alias.AliasManager`
 
 To see which attributes of these classes are configurable, please see the
 source code for these classes, the class docstrings or the sample
 configuration file :mod:`IPython.config.default.ipython_config`.
 
 Example
 =======
 
 For those who want to get a quick start, here is a sample
 :file:`ipython_config.py` that sets some of the common configuration
 attributes::
 
     # sample ipython_config.py
     c = get_config()
 
     c.Global.display_banner = True
     c.Global.log_level = 20
     c.Global.extensions = [
         'myextension'
     ]
     c.Global.exec_lines = [
         'import numpy',
         'import scipy'
     ]
     c.Global.exec_files = [
         'mycode.py',
         'fancy.ipy'
     ]
     c.InteractiveShell.autoindent = True
     c.InteractiveShell.colors = 'LightBG'
     c.InteractiveShell.confirm_exit = False
     c.InteractiveShell.deep_reload = True
     c.InteractiveShell.editor = 'nano'
     c.InteractiveShell.prompt_in1 = 'In [\#]: '
     c.InteractiveShell.prompt_in2 = '   .\D.: '
     c.InteractiveShell.prompt_out = 'Out[\#]: '
     c.InteractiveShell.prompts_pad_left = True
     c.InteractiveShell.xmode = 'Context'
 
     c.PrefilterManager.multi_line_specials = True
 
     c.AliasManager.user_aliases = [
      ('la', 'ls -al')
     ]