Merge branch 'ellisonbg-payload' into trunk

IPython/core/display.py

@@ -0,0 +1,122 b''
+# -*- coding: utf-8 -*-
+"""Top-level display functions for displaying object in different formats.
+
+Authors:
+
+* Brian Granger
+"""
+
+#-----------------------------------------------------------------------------
+#       Copyright (C) 2008-2010 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
+#-----------------------------------------------------------------------------
+
+#-----------------------------------------------------------------------------
+# Main functions
+#-----------------------------------------------------------------------------
+
+def display(*objs, **kwargs):
+    """Display a Python object in all frontends.
+
+    By default all representations will be computed and sent to the frontends.
+    Frontends can decide which representation is used and how.
+
+    Parameters
+    ----------
+    objs : tuple of objects
+        The Python objects to display.
+    include : list or tuple, optional
+        A list of format type strings (MIME types) to include in the
+        format data dict. If this is set *only* the format types included
+        in this list will be computed.
+    exclude : list or tuple, optional
+        A list of format type string (MIME types) to exclue in the format
+        data dict. If this is set all format types will be computed,
+        except for those included in this argument.
+    """
+    include = kwargs.get('include')
+    exclude = kwargs.get('exclude')
+    
+    from IPython.core.interactiveshell import InteractiveShell
+    inst = InteractiveShell.instance()
+    format = inst.display_formatter.format
+    publish = inst.display_pub.publish
+
+    for obj in objs:
+        format_dict = format(obj, include=include, exclude=exclude)
+        publish('IPython.core.display.display', format_dict)
+
+
+def display_pretty(*objs):
+    """Display the pretty (default) representation of an object.
+
+    Parameters
+    ----------
+    objs : tuple of objects
+        The Python objects to display.
+    """
+    display(*objs, include=['text/plain'])
+
+
+def display_html(*objs):
+    """Display the HTML representation of an object.
+
+    Parameters
+    ----------
+    objs : tuple of objects
+        The Python objects to display.
+        """
+    display(*objs, include=['text/plain','text/html'])
+
+
+def display_svg(*objs):
+    """Display the SVG representation of an object.
+
+    Parameters
+    ----------
+    objs : tuple of objects
+        The Python objects to display.
+    """
+    display(*objs, include=['text/plain','image/svg+xml'])
+
+
+def display_png(*objs):
+    """Display the PNG representation of an object.
+
+    Parameters
+    ----------
+    objs : tuple of objects
+        The Python objects to display.
+    """
+    display(*objs, include=['text/plain','image/png'])
+
+
+def display_latex(*objs):
+    """Display the LaTeX representation of an object.
+
+    Parameters
+    ----------
+    objs : tuple of objects
+        The Python objects to display.
+    """
+    display(*objs, include=['text/plain','text/latex'])
+
+
+def display_json(*objs):
+    """Display the JSON representation of an object.
+
+    Parameters
+    ----------
+    objs : tuple of objects
+        The Python objects to display.
+    """
+    display(*objs, include=['text/plain','application/json'])
+
+
+

IPython/core/displaypub.py

@@ -0,0 +1,145 b''
+"""An interface for publishing rich data to frontends.
+
+There are two components of the display system:
+
+* Display formatters, which take a Python object and compute the
+  representation of the object in various formats (text, HTML, SVg, etc.).
+* The display publisher that is used to send the representation data to the
+  various frontends.
+
+This module defines the logic display publishing. The display publisher uses
+the ``display_data`` message type that is defined in the IPython messaging
+spec.
+
+Authors:
+
+* Brian Granger
+"""
+
+#-----------------------------------------------------------------------------
+#       Copyright (C) 2008-2010 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 __future__ import print_function
+
+from IPython.config.configurable import Configurable
+
+#-----------------------------------------------------------------------------
+# Main payload class
+#-----------------------------------------------------------------------------
+
+class DisplayPublisher(Configurable):
+    """A traited class that publishes display data to frontends.
+
+    Instances of this class are created by the main IPython object and should
+    be accessed there.
+    """
+
+    def _validate_data(self, source, data, metadata=None):
+        """Validate the display data.
+
+        Parameters
+        ----------
+        source : str
+            The fully dotted name of the callable that created the data, like
+            :func:`foo.bar.my_formatter`.
+        data : dict
+            The formata data dictionary.
+        metadata : dict
+            Any metadata for the data.
+        """
+
+        if not isinstance(source, str):
+            raise TypeError('source must be a str, got: %r' % source)
+        if not isinstance(data, dict):
+            raise TypeError('data must be a dict, got: %r' % data)
+        if metadata is not None:
+            if not isinstance(metadata, dict):
+                raise TypeError('metadata must be a dict, got: %r' % data)
+
+    def publish(self, source, data, metadata=None):
+        """Publish data and metadata to all frontends.
+
+        See the ``display_data`` message in the messaging documentation for
+        more details about this message type.
+
+        The following MIME types are currently implemented:
+
+        * text/plain
+        * text/html
+        * text/latex
+        * application/json
+        * image/png
+        * immage/svg+xml
+
+        Parameters
+        ----------
+        source : str
+            A string that give the function or method that created the data,
+            such as 'IPython.core.page'.
+        data : dict
+            A dictionary having keys that are valid MIME types (like 
+            'text/plain' or 'image/svg+xml') and values that are the data for
+            that MIME type. The data itself must be a JSON'able data
+            structure. Minimally all data should have the 'text/plain' data,
+            which can be displayed by all frontends. If more than the plain
+            text is given, it is up to the frontend to decide which
+            representation to use.
+        metadata : dict
+            A dictionary for metadata related to the data. This can contain
+            arbitrary key, value pairs that frontends can use to interpret
+            the data.
+        """
+        from IPython.utils import io
+        # The default is to simply write the plain text data using io.Term.
+        if data.has_key('text/plain'):
+            print(data['text/plain'], file=io.Term.cout)
+
+
+def publish_display_data(self, source, data, metadata=None):
+    """Publish data and metadata to all frontends.
+
+    See the ``display_data`` message in the messaging documentation for
+    more details about this message type.
+
+    The following MIME types are currently implemented:
+
+    * text/plain
+    * text/html
+    * text/latex
+    * application/json
+    * image/png
+    * immage/svg+xml
+
+    Parameters
+    ----------
+    source : str
+        A string that give the function or method that created the data,
+        such as 'IPython.core.page'.
+    data : dict
+        A dictionary having keys that are valid MIME types (like 
+        'text/plain' or 'image/svg+xml') and values that are the data for
+        that MIME type. The data itself must be a JSON'able data
+        structure. Minimally all data should have the 'text/plain' data,
+        which can be displayed by all frontends. If more than the plain
+        text is given, it is up to the frontend to decide which
+        representation to use.
+    metadata : dict
+        A dictionary for metadata related to the data. This can contain
+        arbitrary key, value pairs that frontends can use to interpret
+        the data.
+    """
+    from IPython.core.interactiveshell import InteractiveShell
+    InteractiveShell.instance().display_pub.publish(
+        source,
+        data,
+        metadata
+    )
+

IPython/extensions/sympy_printing.py

@@ -0,0 +1,65 b''
+"""A print function that pretty prints sympy Basic objects.
+
+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 sympy import pretty, latex
+
+#-----------------------------------------------------------------------------
+# 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 funciton 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, encode=True)
+    return png
+
+_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']
+        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
+        )
+        _loaded = True
+

IPython/lib/latextools.py

@@ -0,0 +1,62 b''
+# -*- coding: utf-8 -*-
+"""Tools for handling LaTeX.
+
+Authors:
+
+* Brian Granger
+"""
+#-----------------------------------------------------------------------------
+# Copyright (c) 2010, IPython Development Team.
+#
+# Distributed under the terms of the Modified BSD License.
+#
+# The full license is in the file COPYING.txt, distributed with this software.
+#-----------------------------------------------------------------------------
+
+#-----------------------------------------------------------------------------
+# Imports
+#-----------------------------------------------------------------------------
+
+from StringIO import StringIO
+from base64 import encodestring
+
+#-----------------------------------------------------------------------------
+# Tools
+#-----------------------------------------------------------------------------
+
+
+def latex_to_png(s, encode=True):
+    """Render a LaTeX string to PNG using matplotlib.mathtext.
+
+    Parameters
+    ----------
+    s : str
+        The raw string containing valid inline LaTeX.
+    encode : bool, optional
+        Should the PNG data bebase64 encoded to make it JSON'able.
+    """
+    from matplotlib import mathtext
+    
+    mt = mathtext.MathTextParser('bitmap')
+    f = StringIO()
+    mt.to_png(f, s, fontsize=12)
+    bin_data = f.getvalue()
+    if encode:
+        bin_data = encodestring(bin_data)
+    return bin_data
+
+_data_uri_template_png = """<img src="data:image/png;base64,%s" alt=%s />"""
+
+def latex_to_html(s, alt='image'):
+    """Render LaTeX to HTML with embedded PNG data using data URIs.
+
+    Parameters
+    ----------
+    s : str
+        The raw string containing valid inline LateX.
+    alt : str
+        The alt text to use for the HTML.
+    """
+    base64_data = latex_to_png(s, encode=True)
+    return _data_uri_template_png  % (base64_data, alt)
+

IPython/config/default/ipython_config.py

@@ -81,8 +81,6 b' c = get_config()'
 
 # c.InteractiveShell.pdb = False
 
-# c.InteractiveShell.pprint = True
-
 # c.InteractiveShell.prompt_in1 = 'In [\#]: '
 # c.InteractiveShell.prompt_in2 = '   .\D.: '
 # c.InteractiveShell.prompt_out = 'Out[\#]: '
@@ -129,6 +127,12 b' c = get_config()'
 # c.InteractiveShell.xmode = 'Context'
 
 #-----------------------------------------------------------------------------
+# Formatter and display options
+#-----------------------------------------------------------------------------
+
+# c.PlainTextFormatter.pprint = True
+
+#-----------------------------------------------------------------------------
 # PrefilterManager options
 #-----------------------------------------------------------------------------
 

IPython/config/profile/ipython_config_sympy.py

@@ -15,7 +15,15 b" f, g, h = map(Function, 'fgh')"
 # You have to make sure that attributes that are containers already
 # exist before using them.  Simple assigning a new list will override
 # all previous values.
+
 if hasattr(c.Global, 'exec_lines'):
     c.Global.exec_lines.append(lines)
 else:
     c.Global.exec_lines = [lines]
+
+# Load the sympy_printing extension to enable nice printing of sympy expr's.
+if hasattr(c.Global, 'extensions'):
+    c.Global.extensions.append('sympy_printing')
+else:
+    c.Global.extensions = ['sympy_printing']
+

IPython/core/displayhook.py

@@ -1,10 +1,13 b''
 # -*- coding: utf-8 -*-
 """Displayhook for IPython.
 
+This defines a callable class that IPython uses for `sys.displayhook`.
+
 Authors:
 
 * Fernando Perez
 * Brian Granger
+* Robert Kern
 """
 
 #-----------------------------------------------------------------------------
@@ -27,7 +30,6 b' import IPython.utils.generics'
 import IPython.utils.io
 from IPython.utils.traitlets import Instance, List
 from IPython.utils.warn import warn
-from IPython.core.formatters import DefaultFormatter
 
 #-----------------------------------------------------------------------------
 # Main displayhook class
@@ -54,19 +56,6 b' class DisplayHook(Configurable):'
 
     shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
 
-    # The default formatter.
-    default_formatter = Instance('IPython.core.formatters.FormatterABC')
-    def _default_formatter_default(self):
-        # FIXME: backwards compatibility for the InteractiveShell.pprint option?
-        return DefaultFormatter(config=self.config)
-
-    # Any additional FormatterABC instances we use.
-    # FIXME: currently unused.
-    extra_formatters = List(config=True)
-
-    # Each call to the In[] prompt raises it by 1, even the first.
-    #prompt_count = Int(0)
-
     def __init__(self, shell=None, cache_size=1000,
                  colors='NoColor', input_sep='\n',
                  output_sep='\n', output_sep2='',
@@ -185,36 +174,63 b' class DisplayHook(Configurable):'
         pass
 
     def write_output_prompt(self):
-        """Write the output prompt."""
+        """Write the output prompt.
+
+        The default implementation simply writes the prompt to
+        ``io.Term.cout``.
+        """
         # Use write, not print which adds an extra space.
         IPython.utils.io.Term.cout.write(self.output_sep)
         outprompt = str(self.prompt_out)
         if self.do_full_cache:
             IPython.utils.io.Term.cout.write(outprompt)
 
-    def compute_result_repr(self, result):
-        """Compute and return the repr of the object to be displayed.
-
-        This method only compute the string form of the repr and should NOT
-        actually print or write that to a stream.
+    def compute_format_data(self, result):
+        """Compute format data of the object to be displayed.
+
+        The format data is a generalization of the :func:`repr` of an object.
+        In the default implementation the format data is a :class:`dict` of
+        key value pair where the keys are valid MIME types and the values
+        are JSON'able data structure containing the raw data for that MIME
+        type. It is up to frontends to determine pick a MIME to to use and
+        display that data in an appropriate manner.
+
+        This method only computes the format data for the object and should
+        NOT actually print or write that to a stream.
+
+        Parameters
+        ----------
+        result : object
+            The Python object passed to the display hook, whose format will be
+            computed.
+
+        Returns
+        -------
+        format_data : dict
+            A :class:`dict` whose keys are valid MIME types and values are
+            JSON'able raw data for that MIME type. It is recommended that
+            all return values of this should always include the "text/plain"
+            MIME type representation of the object.
         """
-        result_repr = self.default_formatter(result)
-        extra_formats = []
-        for f in self.extra_formatters:
-            try:
-                data = f(result)
-            except Exception:
-                # FIXME: log the exception.
-                continue
-            if data is not None:
-                extra_formats.append((f.id, f.format, data))
+        return self.shell.display_formatter.format(result)
 
-        return result_repr, extra_formats
+    def write_format_data(self, format_dict):
+        """Write the format data dict to the frontend.
 
-    def write_result_repr(self, result_repr, extra_formats):
+        This default version of this method simply writes the plain text
+        representation of the object to ``io.Term.cout``. Subclasses should
+        override this method to send the entire `format_dict` to the
+        frontends.
+
+        Parameters
+        ----------
+        format_dict : dict
+            The format dict for the object passed to `sys.displayhook`.
+        """
         # We want to print because we want to always make sure we have a 
         # newline, even if all the prompt separators are ''. This is the
         # standard IPython behavior.
+        result_repr = format_dict['text/plain']
         if '\n' in result_repr:
             # So that multi-line strings line up with the left column of
             # the screen, instead of having the output prompt mess up
@@ -278,8 +294,8 b' class DisplayHook(Configurable):'
         if result is not None and not self.quiet():
             self.start_displayhook()
             self.write_output_prompt()
-            result_repr, extra_formats = self.compute_result_repr(result)
-            self.write_result_repr(result_repr, extra_formats)
+            format_dict = self.compute_format_data(result)
+            self.write_format_data(format_dict)
             self.update_user_ns(result)
             self.log_output(result)
             self.finish_displayhook()
@@ -300,5 +316,6 b' class DisplayHook(Configurable):'
         if '_' not in __builtin__.__dict__:
             self.shell.user_ns.update({'_':None,'__':None, '___':None})
         import gc
-        gc.collect() # xxx needed?
+        # TODO: Is this really needed?
+        gc.collect()
 

IPython/core/formatters.py

@@ -1,36 +1,11 b''
 # -*- coding: utf-8 -*-
-"""Displayhook formatters.
-
-The DefaultFormatter is always present and may be configured from the
-ipython_config.py file. For example, to add a pretty-printer for a numpy.dtype
-object::
-
-    def dtype_pprinter(obj, p, cycle):
-        if cycle:
-            return p.text('dtype(...)')
-        if hasattr(obj, 'fields'):
-            if obj.fields is None:
-                p.text(repr(obj))
-            else:
-                p.begin_group(7, 'dtype([')
-                for i, field in enumerate(obj.descr):
-                    if i > 0:
-                        p.text(',')
-                        p.breakable()
-                    p.pretty(field)
-                p.end_group(7, '])')
-
-    c.DefaultFormatter.deferred_pprinters = {
-        ('numpy', 'dtype'): dtype_pprinter,
-    }
-        
-The deferred_pprinters dictionary is the preferred way to configure these
-pretty-printers. This allows you to define the pretty-printer without needing to
-import the type itself. The dictionary maps (modulename, typename) pairs to
-a function.
-
-See the `IPython.external.pretty` documentation for how to write
-pretty-printer functions.
+"""Display formatters.
+
+
+Authors:
+
+* Robert Kern
+* Brian Granger
 """
 #-----------------------------------------------------------------------------
 # Copyright (c) 2010, IPython Development Team.
@@ -40,9 +15,14 b' pretty-printer functions.'
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
+#-----------------------------------------------------------------------------
+# Imports
+#-----------------------------------------------------------------------------
+
 # Stdlib imports
 import abc
-from cStringIO import StringIO
+# We must use StringIO, as cStringIO doesn't handle unicode properly.
+from StringIO import StringIO
 
 # Our own imports
 from IPython.config.configurable import Configurable
@@ -51,19 +31,315 b' from IPython.utils.traitlets import Bool, Dict, Int, Str'
 
 
 #-----------------------------------------------------------------------------
-# Classes and functions
+# The main DisplayFormatter class
+#-----------------------------------------------------------------------------
+
+
+class DisplayFormatter(Configurable):
+
+    # When set to true only the default plain text formatter will be used.
+    plain_text_only = Bool(False, config=True)
+
+    # A dict of formatter whose keys are format types (MIME types) and whose
+    # values are subclasses of BaseFormatter.
+    formatters = Dict(config=True)
+    def _formatters_default(self):
+        """Activate the default formatters."""
+        formatter_classes = [
+            PlainTextFormatter,
+            HTMLFormatter,
+            SVGFormatter,
+            PNGFormatter,
+            LatexFormatter,
+            JSONFormatter
+        ]
+        d = {}
+        for cls in formatter_classes:
+            f = cls(config=self.config)
+            d[f.format_type] = f
+        return d
+
+    def format(self, obj, include=None, exclude=None):
+        """Return a format data dict for an object.
+
+        By default all format types will be computed.
+
+        The following MIME types are currently implemented:
+
+        * text/plain
+        * text/html
+        * text/latex
+        * application/json
+        * image/png
+        * immage/svg+xml
+
+        Parameters
+        ----------
+        obj : object
+            The Python object whose format data will be computed.
+        include : list or tuple, optional
+            A list of format type strings (MIME types) to include in the
+            format data dict. If this is set *only* the format types included
+            in this list will be computed.
+        exclude : list or tuple, optional
+            A list of format type string (MIME types) to exclue in the format
+            data dict. If this is set all format types will be computed,
+            except for those included in this argument.
+
+        Returns
+        -------
+        format_dict : dict
+            A dictionary of key/value pairs, one or each format that was
+            generated for the object. The keys are the format types, which
+            will usually be MIME type strings and the values and JSON'able
+            data structure containing the raw data for the representation in
+            that format.
+        """
+        format_dict = {}
+
+        # If plain text only is active
+        if self.plain_text_only:
+            formatter = self.formatters['text/plain']
+            try:
+                data = formatter(obj)
+            except:
+                # FIXME: log the exception
+                raise
+            if data is not None:
+                format_dict['text/plain'] = data
+            return format_dict
+
+        for format_type, formatter in self.formatters.items():
+            if include is not None:
+                if format_type not in include:
+                    continue
+            if exclude is not None:
+                if format_type in exclude:
+                    continue
+            try:
+                data = formatter(obj)
+            except:
+                # FIXME: log the exception
+                raise
+            if data is not None:
+                format_dict[format_type] = data
+        return format_dict
+
+    @property
+    def format_types(self):
+        """Return the format types (MIME types) of the active formatters."""
+        return self.formatters.keys()
+
+
+#-----------------------------------------------------------------------------
+# Formatters for specific format types (text, html, svg, etc.)
 #-----------------------------------------------------------------------------
 
-class DefaultFormatter(Configurable):
-    """ The default pretty-printer.
+
+class FormatterABC(object):
+    """ Abstract base class for Formatters.
+
+    A formatter is a callable class that is responsible for computing the
+    raw format data for a particular format type (MIME type). For example,
+    an HTML formatter would have a format type of `text/html` and would return
+    the HTML representation of the object when called.
     """
+    __metaclass__ = abc.ABCMeta
+
+    # The format type of the data returned, usually a MIME type.
+    format_type = 'text/plain'
 
-    # The ID of the formatter.
-    id = Str('default')
+    # Is the formatter enabled...
+    enabled = True
 
-    # The kind of data returned.
-    # This is often, but not always a MIME type.
-    format = Str('text/plain')
+    @abc.abstractmethod
+    def __call__(self, obj):
+        """Return a JSON'able representation of the object.
+
+        If the object cannot be formatted by this formatter, then return None
+        """
+        try:
+            return repr(obj)
+        except TypeError:
+            return None
+
+
+class BaseFormatter(Configurable):
+    """A base formatter class that is configurable.
+
+    This formatter should usually be used as the base class of all formatters.
+    It is a traited :class:`Configurable` class and includes an extensible
+    API for users to determine how their objects are formatted. The following
+    logic is used to find a function to format an given object.
+
+    1. The object is introspected to see if it has a method with the name
+       :attr:`print_method`. If is does, that object is passed to that method
+       for formatting.
+    2. If no print method is found, three internal dictionaries are consulted
+       to find print method: :attr:`singleton_printers`, :attr:`type_printers`
+       and :attr:`deferred_printers`.
+
+    Users should use these dictionaries to register functions that will be
+    used to compute the format data for their objects (if those objects don't
+    have the special print methods). The easiest way of using these
+    dictionaries is through the :meth:`for_type` and :meth:`for_type_by_name`
+    methods.
+
+    If no function/callable is found to compute the format data, ``None`` is
+    returned and this format type is not used.
+    """
+
+    format_type = Str('text/plain')
+
+    enabled = Bool(True, config=True)
+
+    print_method = Str('__repr__')
+
+    # The singleton printers.
+    # Maps the IDs of the builtin singleton objects to the format functions.
+    singleton_printers = Dict(config=True)
+    def _singleton_printers_default(self):
+        return {}
+
+    # The type-specific printers.
+    # Map type objects to the format functions.
+    type_printers = Dict(config=True)
+    def _type_printers_default(self):
+        return {}
+
+    # The deferred-import type-specific printers.
+    # Map (modulename, classname) pairs to the format functions.
+    deferred_printers = Dict(config=True)
+    def _deferred_printers_default(self):
+        return {}
+
+    def __call__(self, obj):
+        """Compute the format for an object."""
+        if self.enabled:
+            obj_id = id(obj)
+            try:
+                obj_class = getattr(obj, '__class__', None) or type(obj)
+                if hasattr(obj_class, self.print_method):
+                    printer = getattr(obj_class, self.print_method)
+                    return printer(obj)
+                try:
+                    printer = self.singleton_printers[obj_id]
+                except (TypeError, KeyError):
+                    pass
+                else:
+                    return printer(obj)
+                for cls in pretty._get_mro(obj_class):
+                    if cls in self.type_printers:
+                        return self.type_printers[cls](obj)
+                    else:
+                        printer = self._in_deferred_types(cls)
+                        if printer is not None:
+                            return printer(obj)
+                return None
+            except Exception:
+                pass
+        else:
+            return None
+
+    def for_type(self, typ, func):
+        """Add a format function for a given type.
+
+        Parameters
+        -----------
+        typ : class
+            The class of the object that will be formatted using `func`.
+        func : callable
+            The callable that will be called to compute the format data. The
+            call signature of this function is simple, it must take the
+            object to be formatted and return the raw data for the given
+            format. Subclasses may use a different call signature for the
+            `func` argument.
+        """
+        oldfunc = self.type_printers.get(typ, None)
+        if func is not None:
+            # To support easy restoration of old printers, we need to ignore
+            # Nones.
+            self.type_printers[typ] = func
+        return oldfunc
+
+    def for_type_by_name(self, type_module, type_name, func):
+        """Add a format function for a type specified by the full dotted
+        module and name of the type, rather than the type of the object.
+
+        Parameters
+        ----------
+        type_module : str
+            The full dotted name of the module the type is defined in, like
+            ``numpy``.
+        type_name : str
+            The name of the type (the class name), like ``dtype``
+        func : callable
+            The callable that will be called to compute the format data. The
+            call signature of this function is simple, it must take the
+            object to be formatted and return the raw data for the given
+            format. Subclasses may use a different call signature for the
+            `func` argument.
+        """
+        key = (type_module, type_name)
+        oldfunc = self.deferred_printers.get(key, None)
+        if func is not None:
+            # To support easy restoration of old printers, we need to ignore
+            # Nones.
+            self.deferred_printers[key] = func
+        return oldfunc
+
+    def _in_deferred_types(self, cls):
+        """
+        Check if the given class is specified in the deferred type registry.
+
+        Returns the printer from the registry if it exists, and None if the
+        class is not in the registry. Successful matches will be moved to the
+        regular type registry for future use.
+        """
+        mod = getattr(cls, '__module__', None)
+        name = getattr(cls, '__name__', None)
+        key = (mod, name)
+        printer = None
+        if key in self.deferred_printers:
+            # Move the printer over to the regular registry.
+            printer = self.deferred_printers.pop(key)
+            self.type_printers[cls] = printer
+        return printer
+
+
+class PlainTextFormatter(BaseFormatter):
+    """The default pretty-printer.
+
+    This uses :mod:`IPython.external.pretty` to compute the format data of
+    the object. If the object cannot be pretty printed, :func:`repr` is used.
+    See the documentation of :mod:`IPython.external.pretty` for details on
+    how to write pretty printers.  Here is a simple example::
+
+        def dtype_pprinter(obj, p, cycle):
+            if cycle:
+                return p.text('dtype(...)')
+            if hasattr(obj, 'fields'):
+                if obj.fields is None:
+                    p.text(repr(obj))
+                else:
+                    p.begin_group(7, 'dtype([')
+                    for i, field in enumerate(obj.descr):
+                        if i > 0:
+                            p.text(',')
+                            p.breakable()
+                        p.pretty(field)
+                    p.end_group(7, '])')
+    """
+
+    # The format type of data returned.
+    format_type = Str('text/plain')
+
+    # This subclass ignores this attribute as it always need to return
+    # something.
+    enabled = Bool(True, config=False)
+
+    # Look for a __pretty__ methods to use for pretty printing.
+    print_method = Str('__pretty__')
 
     # Whether to pretty-print or not.
     pprint = Bool(True, config=True)
@@ -77,93 +353,152 b' class DefaultFormatter(Configurable):'
     # The newline character.
     newline = Str('\n', config=True)
 
-    # The singleton prettyprinters.
-    # Maps the IDs of the builtin singleton objects to the format functions.
-    singleton_pprinters = Dict(config=True)
-    def _singleton_pprinters_default(self):
+    # Use the default pretty printers from IPython.external.pretty.
+    def _singleton_printers_default(self):
         return pretty._singleton_pprinters.copy()
 
-    # The type-specific prettyprinters.
-    # Map type objects to the format functions.
-    type_pprinters = Dict(config=True)
-    def _type_pprinters_default(self):
+    def _type_printers_default(self):
         return pretty._type_pprinters.copy()
 
-    # The deferred-import type-specific prettyprinters.
-    # Map (modulename, classname) pairs to the format functions.
-    deferred_pprinters = Dict(config=True)
-    def _deferred_pprinters_default(self):
+    def _deferred_printers_default(self):
         return pretty._deferred_type_pprinters.copy()
 
     #### FormatterABC interface ####
 
     def __call__(self, obj):
-        """ Format the object.
-        """
+        """Compute the pretty representation of the object."""
         if not self.pprint:
             try:
                 return repr(obj)
             except TypeError:
                 return ''
         else:
+            # This uses use StringIO, as cStringIO doesn't handle unicode.
             stream = StringIO()
             printer = pretty.RepresentationPrinter(stream, self.verbose,
                 self.max_width, self.newline,
-                singleton_pprinters=self.singleton_pprinters,
-                type_pprinters=self.type_pprinters,
-                deferred_pprinters=self.deferred_pprinters)
+                singleton_pprinters=self.singleton_printers,
+                type_pprinters=self.type_printers,
+                deferred_pprinters=self.deferred_printers)
             printer.pretty(obj)
             printer.flush()
             return stream.getvalue()
 
 
-    #### DefaultFormatter interface ####
+class HTMLFormatter(BaseFormatter):
+    """An HTML formatter.
 
-    def for_type(self, typ, func):
-        """
-        Add a pretty printer for a given type.
-        """
-        oldfunc = self.type_pprinters.get(typ, None)
-        if func is not None:
-            # To support easy restoration of old pprinters, we need to ignore
-            # Nones.
-            self.type_pprinters[typ] = func
-        return oldfunc
+    To define the callables that compute the HTML representation of your
+    objects, define a :meth:`__html__` method or use the :meth:`for_type`
+    or :meth:`for_type_by_name` methods to register functions that handle
+    this.
+    """
+    format_type = Str('text/html')
 
-    def for_type_by_name(self, type_module, type_name, func):
-        """
-        Add a pretty printer for a type specified by the module and name of
-        a type rather than the type object itself.
-        """
-        key = (type_module, type_name)
-        oldfunc = self.deferred_pprinters.get(key, None)
-        if func is not None:
-            # To support easy restoration of old pprinters, we need to ignore
-            # Nones.
-            self.deferred_pprinters[key] = func
-        return oldfunc
+    print_method = Str('__html__')
 
 
-class FormatterABC(object):
-    """ Abstract base class for Formatters.
+class SVGFormatter(BaseFormatter):
+    """An SVG formatter.
+
+    To define the callables that compute the SVG representation of your
+    objects, define a :meth:`__svg__` method or use the :meth:`for_type`
+    or :meth:`for_type_by_name` methods to register functions that handle
+    this.
     """
-    __metaclass__ = abc.ABCMeta
+    format_type = Str('image/svg+xml')
 
-    # The ID of the formatter.
-    id = 'abstract'
+    print_method = Str('__svg__')
 
-    # The kind of data returned.
-    format = 'text/plain'
 
-    @abc.abstractmethod
-    def __call__(self, obj):
-        """ Return a JSONable representation of the object.
+class PNGFormatter(BaseFormatter):
+    """A PNG formatter.
 
-        If the object cannot be formatted by this formatter, then return None
-        """
-        try:
-            return repr(obj)
-        except TypeError:
-            return None
+    To define the callables that compute the PNG representation of your
+    objects, define a :meth:`__png__` method or use the :meth:`for_type`
+    or :meth:`for_type_by_name` methods to register functions that handle
+    this. The raw data should be the base64 encoded raw png data.
+    """
+    format_type = Str('image/png')
+
+    print_method = Str('__png__')
+
+
+class LatexFormatter(BaseFormatter):
+    """A LaTeX formatter.
+
+    To define the callables that compute the LaTeX representation of your
+    objects, define a :meth:`__latex__` method or use the :meth:`for_type`
+    or :meth:`for_type_by_name` methods to register functions that handle
+    this.
+    """
+    format_type = Str('text/latex')
+
+    print_method = Str('__latex__')
+
+
+class JSONFormatter(BaseFormatter):
+    """A JSON string formatter.
+
+    To define the callables that compute the JSON string representation of
+    your objects, define a :meth:`__json__` method or use the :meth:`for_type`
+    or :meth:`for_type_by_name` methods to register functions that handle
+    this.
+    """
+    format_type = Str('application/json')
+
+    print_method = Str('__json__')
+
+
+FormatterABC.register(BaseFormatter)
+FormatterABC.register(PlainTextFormatter)
+FormatterABC.register(HTMLFormatter)
+FormatterABC.register(SVGFormatter)
+FormatterABC.register(PNGFormatter)
+FormatterABC.register(LatexFormatter)
+FormatterABC.register(JSONFormatter)
+
+
+def format_display_data(obj, include=None, exclude=None):
+    """Return a format data dict for an object.
+
+    By default all format types will be computed.
+
+    The following MIME types are currently implemented:
+
+    * text/plain
+    * text/html
+    * text/latex
+    * application/json
+    * image/png
+    * immage/svg+xml
+
+    Parameters
+    ----------
+    obj : object
+        The Python object whose format data will be computed.
+
+    Returns
+    -------
+    format_dict : dict
+        A dictionary of key/value pairs, one or each format that was
+        generated for the object. The keys are the format types, which
+        will usually be MIME type strings and the values and JSON'able
+        data structure containing the raw data for the representation in
+        that format.
+    include : list or tuple, optional
+        A list of format type strings (MIME types) to include in the
+        format data dict. If this is set *only* the format types included
+        in this list will be computed.
+    exclude : list or tuple, optional
+        A list of format type string (MIME types) to exclue in the format
+        data dict. If this is set all format types will be computed,
+        except for those included in this argument.
+    """
+    from IPython.core.interactiveshell import InteractiveShell
 
-FormatterABC.register(DefaultFormatter)
+    InteractiveShell.instance().display_formatter.format(
+        obj,
+        include,
+        exclude
+    )

IPython/core/hooks.py

@@ -156,33 +156,6 b' class CommandChainDispatcher:'
         return iter(self.chain)
 
 
-def result_display(self,arg):
-    """ Default display hook.
-    
-    Called for displaying the result to the user.
-    """
-    
-    if self.pprint:
-        try:
-            out = pformat(arg)
-        except:
-            # Work around possible bugs in pformat
-            out = repr(arg)
-        if '\n' in out:
-            # So that multi-line strings line up with the left column of
-            # the screen, instead of having the output prompt mess up
-            # their first line.                
-            IPython.utils.io.Term.cout.write('\n')
-        print >>IPython.utils.io.Term.cout, out
-    else:
-        # By default, the interactive prompt uses repr() to display results,
-        # so we should honor this.  Users who'd rather use a different
-        # mechanism can easily override this hook.
-        print >>IPython.utils.io.Term.cout, repr(arg)
-    # the default display hook doesn't manipulate the value to put in history
-    return None 
-
-
 def input_prefilter(self,line):     
     """ Default input prefilter
     

IPython/core/interactiveshell.py

@@ -41,9 +41,11 b' from IPython.core.builtin_trap import BuiltinTrap'
 from IPython.core.compilerop import CachingCompiler
 from IPython.core.display_trap import DisplayTrap
 from IPython.core.displayhook import DisplayHook
+from IPython.core.displaypub import DisplayPublisher
 from IPython.core.error import TryNext, UsageError
 from IPython.core.extensions import ExtensionManager
 from IPython.core.fakemodule import FakeModule, init_fakemod_dict
+from IPython.core.formatters import DisplayFormatter
 from IPython.core.history import HistoryManager
 from IPython.core.inputsplitter import IPythonInputSplitter
 from IPython.core.logger import Logger
@@ -149,7 +151,10 b' class InteractiveShell(Configurable, Magic):'
                              default_value=get_default_colors(), config=True)
     debug = CBool(False, config=True)
     deep_reload = CBool(False, config=True)
+    display_formatter = Instance(DisplayFormatter)
     displayhook_class = Type(DisplayHook)
+    display_pub_class = Type(DisplayPublisher)
+
     exit_now = CBool(False)
     # Monotonically increasing execution counter
     execution_count = Int(1)
@@ -167,7 +172,6 b' class InteractiveShell(Configurable, Magic):'
                                     config=True)
     pdb = CBool(False, config=True)
 
-    pprint = CBool(True, config=True)
     profile = Str('', config=True)
     prompt_in1 = Str('In [\\#]: ', config=True)
     prompt_in2 = Str('   .\\D.: ', config=True)
@@ -284,6 +288,8 b' class InteractiveShell(Configurable, Magic):'
         self.init_io()
         self.init_traceback_handlers(custom_exceptions)
         self.init_prompts()
+        self.init_display_formatter()
+        self.init_display_pub()
         self.init_displayhook()
         self.init_reload_doctest()
         self.init_magics()
@@ -481,6 +487,12 b' class InteractiveShell(Configurable, Magic):'
         # will initialize that object and all prompt related information.
         pass
 
+    def init_display_formatter(self):
+        self.display_formatter = DisplayFormatter(config=self.config)
+
+    def init_display_pub(self):
+        self.display_pub = self.display_pub_class(config=self.config)
+
     def init_displayhook(self):
         # Initialize displayhook, set in/out prompts and printing system
         self.displayhook = self.displayhook_class(

IPython/core/magic.py

@@ -2424,12 +2424,12 b' Defaulting color scheme to \'NoColor\'"""'
         else:
             shell.inspector.set_active_scheme('NoColor')
                 
-    def magic_Pprint(self, parameter_s=''):
+    def magic_pprint(self, parameter_s=''):
         """Toggle pretty printing on/off."""
-        
-        self.shell.pprint = 1 - self.shell.pprint
+        ptformatter = self.shell.display_formatter.formatters['text/plain']
+        ptformatter.pprint = bool(1 - ptformatter.pprint)
         print 'Pretty printing has been turned', \
-              ['OFF','ON'][self.shell.pprint]
+              ['OFF','ON'][ptformatter.pprint]
                 
     def magic_Exit(self, parameter_s=''):
         """Exit IPython."""
@@ -3163,6 +3163,8 b' Defaulting color scheme to \'NoColor\'"""'
         shell = self.shell
         oc = shell.displayhook
         meta = shell.meta
+        disp_formatter = self.shell.display_formatter
+        ptformatter = disp_formatter.formatters['text/plain']
         # dstore is a data store kept in the instance metadata bag to track any
         # changes we make, so we can undo them later.
         dstore = meta.setdefault('doctest_mode',Struct())
@@ -3170,12 +3172,13 b' Defaulting color scheme to \'NoColor\'"""'
 
         # save a few values we'll need to recover later
         mode = save_dstore('mode',False)
-        save_dstore('rc_pprint',shell.pprint)
+        save_dstore('rc_pprint',ptformatter.pprint)
         save_dstore('xmode',shell.InteractiveTB.mode)
         save_dstore('rc_separate_out',shell.separate_out)
         save_dstore('rc_separate_out2',shell.separate_out2)
         save_dstore('rc_prompts_pad_left',shell.prompts_pad_left)
         save_dstore('rc_separate_in',shell.separate_in)
+        save_dstore('rc_plain_text_only',disp_formatter.plain_text_only)
 
         if mode == False:
             # turn on
@@ -3191,7 +3194,8 b' Defaulting color scheme to \'NoColor\'"""'
             oc.prompt1.pad_left = oc.prompt2.pad_left = \
                                   oc.prompt_out.pad_left = False
 
-            shell.pprint = False
+            ptformatter.pprint = False
+            disp_formatter.plain_text_only = True
             
             shell.magic_xmode('Plain')
         else:
@@ -3208,7 +3212,8 b' Defaulting color scheme to \'NoColor\'"""'
             oc.prompt1.pad_left = oc.prompt2.pad_left = \
                          oc.prompt_out.pad_left = dstore.rc_prompts_pad_left
 
-            shell.pprint = dstore.rc_pprint
+            ptformatter.pprint = dstore.rc_pprint
+            disp_formatter.plain_text_only = dstore.rc_plain_text_only
 
             shell.magic_xmode(dstore.xmode)
 

IPython/core/usage.py

@@ -441,6 +441,31 b' We have provided as magics ``%less`` to page files (aliased to ``%more``),'
 most common commands you'd want to call in your subshell and that would cause
 problems if invoked via ``!cmd``, but you need to be aware of this limitation.
 
+Display
+=======
+
+The IPython console can now display objects in a variety of formats, including
+HTML, PNG and SVG. This is accomplished using the display functions in
+``IPython.core.display``::
+
+    In [4]: from IPython.core.display import display, display_html
+
+    In [5]: from IPython.core.display import display_png, display_svg
+
+Python objects can simply be passed to these functions and the appropriate
+representations will be displayed in the console as long as the objects know
+how to compute those representations. The easiest way of teaching objects how
+to format themselves in various representations is to define special methods
+such as: ``__html``, ``__svg__`` and ``__png__``. IPython's display formatters
+can also be given custom formatter functions for various types::
+
+    In [6]: ip = get_ipython()
+
+    In [7]: html_formatter = ip.display_formatter.formatters['text/html']
+
+    In [8]: html_formatter.for_type(Foo, foo_to_html)
+
+For further details, see ``IPython.core.formatters``.
 
 Inline matplotlib graphics
 ==========================
@@ -448,10 +473,14 b' Inline matplotlib graphics'
 The IPython console is capable of displaying matplotlib figures inline, in SVG
 format.  If started with the ``--pylab inline`` flag, then all figures are
 rendered inline automatically.  If started with ``--pylab`` or ``--pylab <your
-backend>``, then a GUI backend will be used, but the ``pastefig()`` function is
-added to the global and ``plt`` namespaces.  You can paste any figure that is
-currently open in a window with this function; type ``pastefig?`` for
-additional details."""
+backend>``, then a GUI backend will be used, but IPython's ``display()`` and
+``getfigs()`` functions can be used to view plots inline::
+
+    In [9]: display(*getfigs())    # display all figures inline
+
+    In[10]: display(*getfigs(1,2)) # display figures 1 and 2 inline
+"""
+
 
 quick_guide = """\
 ?         -> Introduction and overview of IPython's features.

IPython/frontend/qt/console/frontend_widget.py

@@ -352,7 +352,7 b' class FrontendWidget(HistoryConsoleWidget, BaseFrontendMixin):'
         """ Handle display hook output.
         """
         if not self._hidden and self._is_from_this_session(msg):
-            self._append_plain_text(msg['content']['data'] + '\n')
+            self._append_plain_text(msg['content']['data']['text/plain'] + '\n')
 
     def _handle_stream(self, msg):
         """ Handle stdout, stderr, and stdin.

IPython/frontend/qt/console/ipython_widget.py

@@ -179,9 +179,39 b' class IPythonWidget(FrontendWidget):'
         if not self._hidden and self._is_from_this_session(msg):
             content = msg['content']
             prompt_number = content['execution_count']
-            self._append_plain_text(self.output_sep)
-            self._append_html(self._make_out_prompt(prompt_number))
-            self._append_plain_text(content['data']+self.output_sep2)
+            data = content['data']
+            if data.has_key('text/html'):
+                self._append_plain_text(self.output_sep)
+                self._append_html(self._make_out_prompt(prompt_number))
+                html = data['text/html']
+                self._append_plain_text('\n')
+                self._append_html(html + self.output_sep2)
+            elif data.has_key('text/plain'):
+                self._append_plain_text(self.output_sep)
+                self._append_html(self._make_out_prompt(prompt_number))
+                text = data['text/plain']
+                self._append_plain_text(text + self.output_sep2)
+
+    def _handle_display_data(self, msg):
+        """ The base handler for the ``display_data`` message.
+        """
+        # For now, we don't display data from other frontends, but we 
+        # eventually will as this allows all frontends to monitor the display
+        # data. But we need to figure out how to handle this in the GUI.
+        if not self._hidden and self._is_from_this_session(msg):
+            source = msg['content']['source']
+            data = msg['content']['data']
+            metadata = msg['content']['metadata']
+            # In the regular IPythonWidget, we simply print the plain text
+            # representation.
+            if data.has_key('text/html'):
+                html = data['text/html']
+                self._append_html(html)
+            elif data.has_key('text/plain'):
+                text = data['text/plain']
+                self._append_plain_text(text)
+            # This newline seems to be needed for text and html output.
+            self._append_plain_text(u'\n')
 
     def _started_channels(self):
         """ Reimplemented to make a history request.
@@ -444,7 +474,7 b' class IPythonWidget(FrontendWidget):'
         else:
             self._page(item['text'], html=False)
 
-    #------ Trait change handlers ---------------------------------------------
+    #------ Trait change handlers --------------------------------------------
 
     def _style_sheet_changed(self):
         """ Set the style sheets of the underlying widgets.
@@ -464,4 +494,4 b' class IPythonWidget(FrontendWidget):'
             self._highlighter.set_style(self.syntax_style)
         else:
             self._highlighter.set_style_sheet(self.style_sheet)
-        
+

IPython/frontend/qt/console/rich_ipython_widget.py

@@ -1,6 +1,7 b''
 # System library imports
 import os
 import re
+from base64 import decodestring
 from PyQt4 import QtCore, QtGui
 
 # Local imports
@@ -56,7 +57,60 b' class RichIPythonWidget(IPythonWidget):'
                 menu.addAction('Save SVG As...', 
                                lambda: save_svg(svg, self._control))
         return menu
-    
+
+    #---------------------------------------------------------------------------
+    # 'BaseFrontendMixin' abstract interface
+    #---------------------------------------------------------------------------
+
+    def _handle_pyout(self, msg):
+        """ Overridden to handle rich data types, like SVG.
+        """
+        if not self._hidden and self._is_from_this_session(msg):
+            content = msg['content']
+            prompt_number = content['execution_count']
+            data = content['data']
+            if data.has_key('image/svg+xml'):
+                self._append_plain_text(self.output_sep)
+                self._append_html(self._make_out_prompt(prompt_number))
+                # TODO: try/except this call.
+                self._append_svg(data['image/svg+xml'])
+                self._append_html(self.output_sep2)
+            elif data.has_key('image/png'):
+                self._append_plain_text(self.output_sep)
+                self._append_html(self._make_out_prompt(prompt_number))
+                # This helps the output to look nice.
+                self._append_plain_text('\n')
+                # TODO: try/except these calls
+                png = decodestring(data['image/png'])
+                self._append_png(png)
+                self._append_html(self.output_sep2)
+            else:
+                # Default back to the plain text representation.
+                return super(RichIPythonWidget, self)._handle_pyout(msg)
+
+    def _handle_display_data(self, msg):
+        """ Overridden to handle rich data types, like SVG.
+        """
+        if not self._hidden and self._is_from_this_session(msg):
+            source = msg['content']['source']
+            data = msg['content']['data']
+            metadata = msg['content']['metadata']
+            # Try to use the svg or html representations.
+            # FIXME: Is this the right ordering of things to try?
+            if data.has_key('image/svg+xml'):
+                svg = data['image/svg+xml']
+                # TODO: try/except this call.
+                self._append_svg(svg)
+            elif data.has_key('image/png'):
+                # TODO: try/except these calls
+                # PNG data is base64 encoded as it passes over the network
+                # in a JSON structure so we decode it.
+                png = decodestring(data['image/png'])
+                self._append_png(png)
+            else:
+                # Default back to the plain text representation.
+                return super(RichIPythonWidget, self)._handle_display_data(msg)
+
     #---------------------------------------------------------------------------
     # 'FrontendWidget' protected interface
     #---------------------------------------------------------------------------
@@ -64,21 +118,12 b' class RichIPythonWidget(IPythonWidget):'
     def _process_execute_payload(self, item):
         """ Reimplemented to handle matplotlib plot payloads.
         """
+        # TODO: remove this as all plot data is coming back through the
+        # display_data message type.
         if item['source'] == self._payload_source_plot:
             if item['format'] == 'svg':
                 svg = item['data']
-                try:
-                    image = svg_to_image(svg)
-                except ValueError:
-                    self._append_plain_text('Received invalid plot data.')
-                else:
-                    format = self._add_image(image)
-                    self._name_to_svg[str(format.name())] = svg
-                    format.setProperty(self._svg_text_format_property, svg)
-                    cursor = self._get_end_cursor()
-                    cursor.insertBlock()
-                    cursor.insertImage(format)
-                    cursor.insertBlock()
+                self._append_svg(svg)
                 return True
             else:
                 # Add other plot formats here!
@@ -90,6 +135,37 b' class RichIPythonWidget(IPythonWidget):'
     # 'RichIPythonWidget' protected interface
     #---------------------------------------------------------------------------
 
+    def _append_svg(self, svg):
+        """ Append raw svg data to the widget.
+        """
+        try:
+            image = svg_to_image(svg)
+        except ValueError:
+            self._append_plain_text('Received invalid plot data.')
+        else:
+            format = self._add_image(image)
+            self._name_to_svg[str(format.name())] = svg
+            format.setProperty(self._svg_text_format_property, svg)
+            cursor = self._get_end_cursor()
+            cursor.insertBlock()
+            cursor.insertImage(format)
+            cursor.insertBlock()
+
+    def _append_png(self, png):
+        """ Append raw svg data to the widget.
+        """
+        try:
+            image = QtGui.QImage()
+            image.loadFromData(png, 'PNG')
+        except ValueError:
+            self._append_plain_text('Received invalid plot data.')
+        else:
+            format = self._add_image(image)
+            cursor = self._get_end_cursor()
+            cursor.insertBlock()
+            cursor.insertImage(format)
+            cursor.insertBlock()
+
     def _add_image(self, image):
         """ Adds the specified QImage to the document and returns a
             QTextImageFormat that references it.
@@ -192,4 +268,4 b' class RichIPythonWidget(IPythonWidget):'
 
         else:
             return '<b>Unrecognized image format</b>'
-        
+

IPython/frontend/qt/kernelmanager.py

@@ -101,6 +101,9 b' class QtSubSocketChannel(SocketChannelQObject, SubSocketChannel):'
     # Emitted when a message of type 'pyerr' is received.
     pyerr_received = QtCore.pyqtSignal(object)
 
+    # Emitted when a message of type 'display_data' is received
+    display_data_received = QtCore.pyqtSignal(object)
+
     # Emitted when a crash report message is received from the kernel's
     # last-resort sys.excepthook.
     crash_received = QtCore.pyqtSignal(object)
@@ -117,7 +120,6 b' class QtSubSocketChannel(SocketChannelQObject, SubSocketChannel):'
         """
         # Emit the generic signal.
         self.message_received.emit(msg)
-        
         # Emit signals for specialized message types.
         msg_type = msg['msg_type']
         signal = getattr(self, msg_type + '_received', None)

IPython/frontend/terminal/ipapp.py

@@ -188,10 +188,10 b' class IPAppConfigLoader(BaseAppConfigLoader):'
             action='store_false', dest='InteractiveShell.pdb',
             help="Disable auto calling the pdb debugger after every exception.")
         paa('--pprint',
-            action='store_true', dest='InteractiveShell.pprint',
+            action='store_true', dest='PlainTextFormatter.pprint',
             help="Enable auto pretty printing of results.")
         paa('--no-pprint',
-            action='store_false', dest='InteractiveShell.pprint',
+            action='store_false', dest='PlainTextFormatter.pprint',
             help="Disable auto auto pretty printing of results.")
         paa('--prompt-in1','-pi1',
             type=str, dest='InteractiveShell.prompt_in1',
@@ -443,7 +443,7 b' class IPythonApp(Application):'
         if hasattr(config.Global, 'classic'):
             if config.Global.classic:
                 config.InteractiveShell.cache_size = 0
-                config.InteractiveShell.pprint = 0
+                config.PlainTextFormatter.pprint = 0
                 config.InteractiveShell.prompt_in1 = '>>> '
                 config.InteractiveShell.prompt_in2 = '... '
                 config.InteractiveShell.prompt_out = ''

IPython/kernel/client.py

@@ -88,7 +88,7 b' def _result_list_printer(obj, p, cycle):'
 # ResultList is a list subclass and will use the default pretty printer.
 # This overrides that to use the __repr__ of ResultList.
 ip = get_ipython()
-ip.displayhook.default_formatter.for_type_by_name(
+ip.display_formatter.formatters['text/plain'].for_type_by_name(
     'IPython.kernel.multiengineclient', 'ResultList', _result_list_printer
 )
 

IPython/lib/pylabtools.py

@@ -19,6 +19,8 b' Authors'
 # Imports
 #-----------------------------------------------------------------------------
 
+from cStringIO import StringIO
+
 from IPython.utils.decorators import flag_calls
 
 # If user specifies a GUI, that dictates the backend, otherwise we read the
@@ -31,7 +33,107 b" backends = {'tk': 'TkAgg',"
             'inline' : 'module://IPython.zmq.pylab.backend_inline'}
 
 #-----------------------------------------------------------------------------
-# Main classes and functions
+# Matplotlib utilities
+#-----------------------------------------------------------------------------
+
+
+def getfigs(*fig_nums):
+    """Get a list of matplotlib figures by figure numbers.
+
+    If no arguments are given, all available figures are returned.  If the
+    argument list contains references to invalid figures, a warning is printed
+    but the function continues pasting further figures.
+
+    Parameters
+    ----------
+    figs : tuple
+        A tuple of ints giving the figure numbers of the figures to return.
+    """
+    from matplotlib._pylab_helpers import Gcf
+    if not fig_nums:
+        fig_managers = Gcf.get_all_fig_managers()
+        return [fm.canvas.figure for fm in fig_managers]
+    else:
+        figs = []
+        for num in fig_nums:
+            f = Gcf.figs.get(num)
+            if f is None:
+                print('Warning: figure %s not available.' % num)
+            figs.append(f.canvas.figure)
+        return figs
+
+
+def figsize(sizex, sizey):
+    """Set the default figure size to be [sizex, sizey].
+
+    This is just an easy to remember, convenience wrapper that sets::
+
+      matplotlib.rcParams['figure.figsize'] = [sizex, sizey]
+    """
+    import matplotlib
+    matplotlib.rcParams['figure.figsize'] = [sizex, sizey]
+
+
+def figure_to_svg(fig):
+    """Convert a figure to svg for inline display."""
+    fc = fig.get_facecolor()
+    ec = fig.get_edgecolor()
+    fig.set_facecolor('white')
+    fig.set_edgecolor('white')
+    try:
+        string_io = StringIO()
+        fig.canvas.print_figure(string_io, format='svg')
+        svg = string_io.getvalue()
+    finally:
+        fig.set_facecolor(fc)
+        fig.set_edgecolor(ec)
+    return svg
+
+
+# We need a little factory function here to create the closure where
+# safe_execfile can live.
+def mpl_runner(safe_execfile):
+    """Factory to return a matplotlib-enabled runner for %run.
+
+    Parameters
+    ----------
+    safe_execfile : function
+      This must be a function with the same interface as the
+      :meth:`safe_execfile` method of IPython.
+
+    Returns
+    -------
+    A function suitable for use as the ``runner`` argument of the %run magic
+    function.
+    """
+    
+    def mpl_execfile(fname,*where,**kw):
+        """matplotlib-aware wrapper around safe_execfile.
+
+        Its interface is identical to that of the :func:`execfile` builtin.
+
+        This is ultimately a call to execfile(), but wrapped in safeties to
+        properly handle interactive rendering."""
+
+        import matplotlib
+        import matplotlib.pylab as pylab
+
+        #print '*** Matplotlib runner ***' # dbg
+        # turn off rendering until end of script
+        is_interactive = matplotlib.rcParams['interactive']
+        matplotlib.interactive(False)
+        safe_execfile(fname,*where,**kw)
+        matplotlib.interactive(is_interactive)
+        # make rendering call now, if the user tried to do it
+        if pylab.draw_if_interactive.called:
+            pylab.draw()
+            pylab.draw_if_interactive.called = False
+
+    return mpl_execfile
+
+
+#-----------------------------------------------------------------------------
+# Code for initializing matplotlib and importing pylab
 #-----------------------------------------------------------------------------
 
 
@@ -111,7 +213,7 b' def import_pylab(user_ns, backend, import_all=True, shell=None):'
         # function that will pick up the results for display.  This can only be
         # done with access to the real shell object.
         if backend == backends['inline']:
-            from IPython.zmq.pylab.backend_inline import flush_svg, figsize
+            from IPython.zmq.pylab.backend_inline import flush_svg
             from matplotlib import pyplot
             shell.register_post_execute(flush_svg)
             # The typical default figure size is too large for inline use.  We
@@ -120,11 +222,22 b' def import_pylab(user_ns, backend, import_all=True, shell=None):'
             # Add 'figsize' to pyplot and to the user's namespace
             user_ns['figsize'] = pyplot.figsize = figsize
             shell.user_ns_hidden['figsize'] = figsize
-        else:
-            from IPython.zmq.pylab.backend_inline import pastefig
-            from matplotlib import pyplot
-            # Add 'paste' to pyplot and to the user's namespace
-            user_ns['pastefig'] = pyplot.pastefig = pastefig
+        
+        # The old pastefig function has been replaced by display
+        # Always add this svg formatter so display works.
+        from IPython.zmq.pylab.backend_inline import figure_to_svg
+        from IPython.core.display import display, display_svg
+        svg_formatter = shell.display_formatter.formatters['image/svg+xml']
+        svg_formatter.for_type_by_name(
+            'matplotlib.figure','Figure',figure_to_svg
+        )
+        # Add display and display_png to the user's namespace
+        user_ns['display'] = display
+        shell.user_ns_hidden['display'] = display
+        user_ns['display_svg'] = display_svg
+        shell.user_ns_hidden['display_svg'] = display_svg
+        user_ns['getfigs'] = getfigs
+        shell.user_ns_hidden['getfigs'] = getfigs
 
     if import_all:
         s = ("from matplotlib.pylab import *\n"
@@ -165,44 +278,3 b' For more information, type \'help(pylab)\'.""" % backend'
     
     return gui
 
-# We need a little factory function here to create the closure where
-# safe_execfile can live.
-def mpl_runner(safe_execfile):
-    """Factory to return a matplotlib-enabled runner for %run.
-
-    Parameters
-    ----------
-    safe_execfile : function
-      This must be a function with the same interface as the
-      :meth:`safe_execfile` method of IPython.
-
-    Returns
-    -------
-    A function suitable for use as the ``runner`` argument of the %run magic
-    function.
-    """
-    
-    def mpl_execfile(fname,*where,**kw):
-        """matplotlib-aware wrapper around safe_execfile.
-
-        Its interface is identical to that of the :func:`execfile` builtin.
-
-        This is ultimately a call to execfile(), but wrapped in safeties to
-        properly handle interactive rendering."""
-
-        import matplotlib
-        import matplotlib.pylab as pylab
-
-        #print '*** Matplotlib runner ***' # dbg
-        # turn off rendering until end of script
-        is_interactive = matplotlib.rcParams['interactive']
-        matplotlib.interactive(False)
-        safe_execfile(fname,*where,**kw)
-        matplotlib.interactive(is_interactive)
-        # make rendering call now, if the user tried to do it
-        if pylab.draw_if_interactive.called:
-            pylab.draw()
-            pylab.draw_if_interactive.called = False
-
-    return mpl_execfile
-

IPython/utils/generics.py

@@ -2,15 +2,6 b''
 """Generic functions for extending IPython.
 
 See http://cheeseshop.python.org/pypi/simplegeneric.
-
-Here is an example from IPython.utils.text::
-
-    def print_lsstring(arg):
-        "Prettier (non-repr-like) and more informative printer for LSString"
-        print "LSString (.p, .n, .l, .s available). Value:"
-        print arg
-        
-    print_lsstring = result_display.when_type(LSString)(print_lsstring)
 """
 
 #-----------------------------------------------------------------------------

IPython/utils/ipstruct.py

@@ -388,8 +388,6 b' class Struct(dict):'
                     inv_conflict_solve_user[func] = inv_conflict_solve_user[name]
                     del inv_conflict_solve_user[name]
             conflict_solve.update(self.__dict_invert(inv_conflict_solve_user))
-        #print 'merge. conflict_solve: '; pprint(conflict_solve) # dbg
-        #print '*'*50,'in merger. conflict_solver:';  pprint(conflict_solve)
         for key in data_dict:
             if key not in self:
                 self[key] = data_dict[key]

IPython/zmq/ipkernel.py

@@ -91,6 +91,8 b' class Kernel(Configurable):'
         self.shell = ZMQInteractiveShell.instance()
         self.shell.displayhook.session = self.session
         self.shell.displayhook.pub_socket = self.pub_socket
+        self.shell.display_pub.session = self.session
+        self.shell.display_pub.pub_socket = self.pub_socket
 
         # TMP - hack while developing
         self.shell._reply_content = None
@@ -194,6 +196,7 b' class Kernel(Configurable):'
 
         # Set the parent message of the display hook and out streams.
         shell.displayhook.set_parent(parent)
+        shell.display_pub.set_parent(parent)
         sys.stdout.set_parent(parent)
         sys.stderr.set_parent(parent)
 

IPython/zmq/pylab/backend_inline.py

@@ -6,99 +6,39 b''
 from __future__ import print_function
 
 # Standard library imports
-from cStringIO import StringIO
 
-# System library imports.
 import matplotlib
 from matplotlib.backends.backend_svg import new_figure_manager
 from matplotlib._pylab_helpers import Gcf
 
 # Local imports.
-from backend_payload import add_plot_payload
+from IPython.core.displaypub import publish_display_data
+from IPython.lib.pylabtools import figure_to_svg
 
 #-----------------------------------------------------------------------------
 # Functions
 #-----------------------------------------------------------------------------
 
-def show(close=True):
+def show(close=False):
     """Show all figures as SVG payloads sent to the IPython clients.
 
     Parameters
     ----------
     close : bool, optional
       If true, a ``plt.close('all')`` call is automatically issued after
-      sending all the SVG figures.
+      sending all the SVG figures. If this is set, the figures will entirely
+      removed from the internal list of figures.
     """
     for figure_manager in Gcf.get_all_fig_managers():
-        send_svg_canvas(figure_manager.canvas)
+        send_svg_figure(figure_manager.canvas.figure)
     if close:
         matplotlib.pyplot.close('all')
 
+
 # This flag will be reset by draw_if_interactive when called
 show._draw_called = False
 
 
-def figsize(sizex, sizey):
-    """Set the default figure size to be [sizex, sizey].
-
-    This is just an easy to remember, convenience wrapper that sets::
-
-      matplotlib.rcParams['figure.figsize'] = [sizex, sizey]
-    """
-    matplotlib.rcParams['figure.figsize'] = [sizex, sizey]
-    
-
-def pastefig(*figs):
-    """Paste one or more figures into the console workspace.
-
-    If no arguments are given, all available figures are pasted.  If the
-    argument list contains references to invalid figures, a warning is printed
-    but the function continues pasting further figures.
-
-    Parameters
-    ----------
-    figs : tuple
-      A tuple that can contain any mixture of integers and figure objects.
-    """
-    if not figs:
-        show(close=False)
-    else:
-        fig_managers = Gcf.get_all_fig_managers()
-        fig_index = dict( [(fm.canvas.figure, fm.canvas) for fm in fig_managers]
-           + [ (fm.canvas.figure.number, fm.canvas) for fm in fig_managers] )
-
-        for fig in figs:
-            canvas = fig_index.get(fig)
-            if canvas is None:
-                print('Warning: figure %s not available.' % fig)
-            else:
-                send_svg_canvas(canvas)
-
-
-def send_svg_canvas(canvas):
-    """Draw the current canvas and send it as an SVG payload.
-    """
-    # Set the background to white instead so it looks good on black.  We store
-    # the current values to restore them at the end.
-    fc = canvas.figure.get_facecolor()
-    ec = canvas.figure.get_edgecolor()
-    canvas.figure.set_facecolor('white')
-    canvas.figure.set_edgecolor('white')
-    try:
-        add_plot_payload('svg', svg_from_canvas(canvas))
-    finally:
-        canvas.figure.set_facecolor(fc)
-        canvas.figure.set_edgecolor(ec)
-
-
-def svg_from_canvas(canvas):
-    """ Return a string containing the SVG representation of a FigureCanvasSvg.
-    """
-    string_io = StringIO()
-    canvas.print_figure(string_io, format='svg')
-    return string_io.getvalue()
-
-
 def draw_if_interactive():
     """
     Is called after every pylab drawing command
@@ -115,5 +55,19 b' def flush_svg():'
     prior code execution, there had been any calls to draw_if_interactive.
     """
     if show._draw_called:
-        show(close=True)
+        # Show is called with the default close=False here, otherwise, the
+        # Figure will be closed and not available for future plotting.
+        show()
         show._draw_called = False
+
+
+def send_svg_figure(fig):
+    """Draw the current figure and send it as an SVG payload.
+    """
+    svg = figure_to_svg(fig)
+    publish_display_data(
+        'IPython.zmq.pylab.backend_inline.send_svg_figure',
+        'Matplotlib Plot',
+        {'image/svg+xml' : svg}
+    )
+

IPython/zmq/zmqshell.py

@@ -26,6 +26,7 b' from IPython.core.interactiveshell import ('
 )
 from IPython.core import page
 from IPython.core.displayhook import DisplayHook
+from IPython.core.displaypub import DisplayPublisher
 from IPython.core.macro import Macro
 from IPython.core.payloadpage import install_payload_page
 from IPython.utils import io
@@ -48,6 +49,7 b' install_payload_page()'
 #-----------------------------------------------------------------------------
 
 class ZMQDisplayHook(DisplayHook):
+    """A displayhook subclass that publishes data using ZeroMQ."""
 
     session = Instance(Session)
     pub_socket = Instance('zmq.Socket')
@@ -65,9 +67,8 b' class ZMQDisplayHook(DisplayHook):'
         if self.do_full_cache:
             self.msg['content']['execution_count'] = self.prompt_count
 
-    def write_result_repr(self, result_repr, extra_formats):
-        self.msg['content']['data'] = result_repr
-        self.msg['content']['extra_formats'] = extra_formats
+    def write_format_data(self, format_dict):
+        self.msg['content']['data'] = format_dict
 
     def finish_displayhook(self):
         """Finish up all displayhook activities."""
@@ -75,10 +76,37 b' class ZMQDisplayHook(DisplayHook):'
         self.msg = None
 
 
+class ZMQDisplayPublisher(DisplayPublisher):
+    """A display publisher that publishes data using a ZeroMQ PUB socket."""
+
+    session = Instance(Session)
+    pub_socket = Instance('zmq.Socket')
+    parent_header = Dict({})
+
+    def set_parent(self, parent):
+        """Set the parent for outbound messages."""
+        self.parent_header = extract_header(parent)
+
+    def publish(self, source, data, metadata=None):
+        if metadata is None:
+            metadata = {}
+        self._validate_data(source, data, metadata)
+        content = {}
+        content['source'] = source
+        content['data'] = data
+        content['metadata'] = metadata
+        self.session.send(
+            self.pub_socket, u'display_data', content,
+            parent=self.parent_header
+        )
+
+
 class ZMQInteractiveShell(InteractiveShell):
     """A subclass of InteractiveShell for ZMQ."""
 
     displayhook_class = Type(ZMQDisplayHook)
+    display_pub_class = Type(ZMQDisplayPublisher)
+
     keepkernel_on_exit = None
 
     def init_environment(self):
@@ -178,6 +206,8 b' class ZMQInteractiveShell(InteractiveShell):'
 
         # Shorthands
         shell = self.shell
+        disp_formatter = self.shell.display_formatter
+        ptformatter = disp_formatter.formatters['text/plain']
         # dstore is a data store kept in the instance metadata bag to track any
         # changes we make, so we can undo them later.
         dstore = shell.meta.setdefault('doctest_mode', Struct())
@@ -185,16 +215,19 b' class ZMQInteractiveShell(InteractiveShell):'
 
         # save a few values we'll need to recover later
         mode = save_dstore('mode', False)
-        save_dstore('rc_pprint', shell.pprint)
+        save_dstore('rc_pprint', ptformatter.pprint)
+        save_dstore('rc_plain_text_only',disp_formatter.plain_text_only)
         save_dstore('xmode', shell.InteractiveTB.mode)
         
         if mode == False:
             # turn on
-            shell.pprint = False
+            ptformatter.pprint = False
+            disp_formatter.plain_text_only = True
             shell.magic_xmode('Plain')
         else:
             # turn off
-            shell.pprint = dstore.rc_pprint
+            ptformatter.pprint = dstore.rc_pprint
+            disp_formatter.plain_text_only = dstore.rc_plain_text_only
             shell.magic_xmode(dstore.xmode)
 
         # Store new mode and inform on console

docs/source/development/messaging.txt

@@ -689,10 +689,10 b' Message type: ``stream``::'
 
     content = {
         # The name of the stream is one of 'stdin', 'stdout', 'stderr'
-    'name' : str,
+        'name' : str,
     
-    # The data is an arbitrary string to be written to that stream
-    'data' : str,
+        # The data is an arbitrary string to be written to that stream
+        'data' : str,
     }
 
 When a kernel receives a raw_input call, it should also broadcast it on the pub
@@ -700,6 +700,39 b" socket with the names 'stdin' and 'stdin_reply'. This will allow other clients"
 to monitor/display kernel interactions and possibly replay them to their user
 or otherwise expose them.
 
+Display Data
+------------
+
+This type of message is used to bring back data that should be diplayed (text,
+html, svg, etc.) in the frontends. This data is published to all frontends.
+Each message can have multiple representations of the data; it is up to the
+frontend to decide which to use and how. A single message should contain all
+possible representations of the same information. Each representation should
+be a JSON'able data structure, and should be a valid MIME type.
+
+Some questions remain about this design:
+
+* Do we use this message type for pyout/displayhook? Probably not, because
+  the displayhook also has to handle the Out prompt display. On the other hand
+  we could put that information into the metadata secion.
+
+Message type: ``display_data``::
+
+    content = {
+
+        # Who create the data
+        'source' : str,
+
+        # The data dict contains key/value pairs, where the kids are MIME
+        # types and the values are the raw data of the representation in that
+        # format. The data dict must minimally contain the ``text/plain``
+        # MIME type which is used as a backup representation.        
+        'data' : dict,
+
+        # Any metadata that describes the data
+        'metadata' : dict
+    }
+
 Python inputs
 -------------
 
@@ -708,8 +741,7 b' These messages are the re-broadcast of the ``execute_request``.'
 Message type: ``pyin``::
 
     content = {
-        # Source code to be executed, one or more lines
-    'code' : str
+        'code' : str  # Source code to be executed, one or more lines
     }
 
 Python outputs
@@ -740,20 +772,18 b' any JSON object and depends on the format. It is often, but not always a string.'
 Message type: ``pyout``::
 
     content = {
-        # The data is typically the repr() of the object. It should be displayed
-        # as monospaced text.
-        'data' : str,
-    
+
         # The counter for this execution is also provided so that clients can
         # display it, since IPython automatically creates variables called _N
         # (for prompt N).
         'execution_count' : int,
+        
+        # The data dict contains key/value pairs, where the kids are MIME
+        # types and the values are the raw data of the representation in that
+        # format. The data dict must minimally contain the ``text/plain``
+        # MIME type which is used as a backup representation.
+        'data' : dict,
 
-        # Any extra formats.
-        # The tuples are of the form (ID, type, data).
-        'extra_formats' : [
-           [str, str, object]
-        ]
     }
     
 Python errors

setupbase.py

@@ -213,13 +213,7 b' def find_data_files():'
     data_files = [ (manpagebase, manpages),
                    (pjoin(docdirbase, 'extensions'), igridhelpfiles),
                    ] + manual_files + example_files
-                 
-    ## import pprint  # dbg
-    ## print('*'*80)
-    ## print('data files')
-    ## pprint.pprint(data_files)
-    ## print('*'*80)
-    
+
     return data_files