From 20aed339aa187cd58bf6d7479ca8166f379afd23 Mon Sep 17 00:00:00 2001
From: Ivan Andrus <darthandrus@gmail.com>
Date: Wed, 1 Apr 2015 23:21:05 -0600
Subject: [PATCH] Add EmacsBackend

---
 src/sage/repl/rich_output/backend_emacs.py | 129 +++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 src/sage/repl/rich_output/backend_emacs.py

diff --git a/src/sage/repl/rich_output/backend_emacs.py b/src/sage/repl/rich_output/backend_emacs.py
new file mode 100644
index 00000000000..85c5659712e
--- /dev/null
+++ b/src/sage/repl/rich_output/backend_emacs.py
@@ -0,0 +1,129 @@
+# -*- encoding: utf-8 -*-
+r"""
+Emacs sage-mode Backend for the Sage Rich Output System
+
+This module defines the Emacs backend for :mod:`sage.repl.rich_output`
+based on the IPython shell version.
+
+"""
+
+#*****************************************************************************
+#       Copyright (C) 2015 Ivan Andrus <darthandrus@gmail.com>
+#
+#  Distributed under the terms of the GNU General Public License (GPL)
+#  as published by the Free Software Foundation; either version 2 of
+#  the License, or (at your option) any later version.
+#                  http://www.gnu.org/licenses/
+#*****************************************************************************
+
+import sys
+from sage.repl.rich_output.backend_ipython import BackendIPythonCommandline
+from sage.repl.rich_output.output_catalog import *
+
+
+class BackendEmacs(BackendIPythonCommandline):
+    """
+    Emacs Backend
+
+    This backend is used by Emacs' sage-mode to have typeset output
+    and inline images.
+
+    EXAMPLES::
+
+        sage: from sage.repl.rich_output.backend_emacs import BackendEmacs
+        sage: BackendEmacs()
+        Emacs sage-mode
+    """
+
+    def _repr_(self):
+        r"""
+        Return string representation of the backend
+
+        OUTPUT:
+
+        String.
+
+        EXAMPLES::
+
+            sage: from sage.repl.rich_output.backend_emacs import BackendEmacs
+            sage: backend = BackendEmacs()
+            sage: backend._repr_()
+            'Emacs sage-mode'
+        """
+        return 'Emacs sage-mode'
+
+    def displayhook(self, plain_text, rich_output):
+        """
+        Backend implementation of the displayhook
+
+        INPUT:
+
+        - ``plain_text`` -- instance of
+          :class:`~sage.repl.rich_output.output_basic.OutputPlainText`. The
+          plain text version of the output.
+
+        - ``rich_output`` -- instance of an output container class
+          (subclass of
+          :class:`~sage.repl.rich_output.output_basic.OutputBase`). Guaranteed
+          to be one of the output containers returned from
+          :meth:`supported_output`, possibly the same as
+          ``plain_text``.
+
+        OUTPUT:
+
+        Because this is based on the IPython commandline display hook,
+        it returns the IPython display data, a pair of
+        dictionaries. The first dictionary contains mime types as keys
+        and the respective output as value. The second dictionary is
+        metadata.
+
+        EXAMPLES::
+
+            sage: from sage.repl.rich_output.output_basic import OutputPlainText, OutputLatex
+            sage: plain_text = OutputPlainText.example()
+            sage: from sage.repl.rich_output.backend_emacs import BackendEmacs
+            sage: backend = BackendEmacs()
+            sage: backend.displayhook(plain_text, plain_text)
+            ({u'text/plain': 'Example plain text output'}, {})
+            sage: latex_text = OutputLatex.example()
+            sage: backend.displayhook(plain_text, latex_text)
+            ({u'text/plain': 'BEGIN_TEXT:Example plain text output:END_TEXT\nBEGIN_LATEX:\\newcommand{\\Bold}[1]{\\mathbf{#1}}\\int \\sin\\left(x\\right)\\,{d x}:END_LATEX'},
+              {})
+        """
+
+        if isinstance(rich_output, OutputPlainText):
+            return ({u'text/plain': rich_output.text.get()}, {})
+        elif isinstance(rich_output, OutputAsciiArt):
+            return ({u'text/plain': rich_output.ascii_art.get()}, {})
+        elif isinstance(rich_output, OutputLatex):
+            text = "BEGIN_TEXT:" + plain_text.text.get() + ":END_TEXT\nBEGIN_LATEX:" + \
+                   rich_output.latex.get() + ":END_LATEX"
+            return ({u'text/plain': text}, {})
+
+        # TODO: perhaps handle these by returning the data inline,
+        # e.g. base64 encoded, so that sage-mode can show inline
+        # images for remotely running shells.
+        elif isinstance(rich_output, OutputImagePng):
+            msg = self.launch_viewer(
+                rich_output.png.filename(ext='png'), plain_text.text.get())
+            return ({u'text/plain': msg}, {})
+        elif isinstance(rich_output, OutputImageGif):
+            msg = self.launch_viewer(
+                rich_output.gif.filename(ext='gif'), plain_text.text.get())
+            return ({u'text/plain': msg}, {})
+        elif isinstance(rich_output, OutputImagePdf):
+            msg = self.launch_viewer(
+                rich_output.pdf.filename(ext='pdf'), plain_text.text.get())
+            return ({u'text/plain': msg}, {})
+        elif isinstance(rich_output, OutputImageDvi):
+            msg = self.launch_viewer(
+                rich_output.dvi.filename(ext='dvi'), plain_text.text.get())
+            return ({u'text/plain': msg}, {})
+        elif isinstance(rich_output, OutputSceneJmol):
+            msg = self.launch_jmol(rich_output, plain_text.text.get())
+            return ({u'text/plain': msg}, {})
+        elif isinstance(rich_output, OutputSceneWavefront):
+            msg = self.launch_sage3d(rich_output, plain_text.text.get())
+            return ({u'text/plain': msg}, {})
+        else:
+            raise TypeError('rich_output type not supported')