{
 "metadata": {
  "name": ""
 },
 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "from IPython.html import widgets\n",
      "from IPython.display import display, Javascript, clear_output\n",
      "from IPython.nbconvert import get_export_names, export_by_name\n",
      "from IPython.nbconvert.writers import FilesWriter\n",
      "from IPython.nbformat import current"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 1
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Create and *display* a StringWidget without a view.  The StringWidget will be used to store the notebook name which is otherwise only available in the front-end."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "notebook_name = widgets.StringWidget(default_view_name='')\n",
      "display(notebook_name)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 2
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Get the current notebook's name by pushing JavaScript to the browser that sets the notebook name in a string widget."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "js = \"\"\"var model = IPython.notebook.kernel.comm_manager.comms['{comm_id}'].model;\n",
      "model.set('value', IPython.notebook.notebook_name);\n",
      "model.save();\"\"\".format(comm_id=notebook_name._comm.comm_id)\n",
      "display(Javascript(data=js))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "javascript": [
        "var model = IPython.notebook.kernel.comm_manager.comms['79dbd18695b3432b94e2265533474474'].model;\n",
        "model.set('value', IPython.notebook.notebook_name);\n",
        "model.save();"
       ],
       "metadata": {},
       "output_type": "display_data",
       "text": [
        "<IPython.core.display.Javascript at 0x208f110>"
       ]
      }
     ],
     "prompt_number": 3
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "filename = notebook_name.value\n",
      "filename"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "metadata": {},
       "output_type": "pyout",
       "prompt_number": 4,
       "text": [
        "u'Export As (nbconvert).ipynb'"
       ]
      }
     ],
     "prompt_number": 4
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Create the widget that will allow the user to Export the current notebook."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "container = widgets.ContainerWidget()\n",
      "container.vbox()\n",
      "container.align_center()\n",
      "\n",
      "options = widgets.ContainerWidget(parent=container)\n",
      "options.hbox()\n",
      "options.align_center()\n",
      "exporter_names = widgets.SelectionWidget(parent=options, values=get_export_names(), value='html')\n",
      "export_button = widgets.ButtonWidget(parent=options, description=\"Export\")\n",
      "\n",
      "download_link = widgets.StringWidget(parent=container, default_view_name=\"LabelView\", visible=False)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 5
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "Export the notebook when the export button is clicked."
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "file_writer = FilesWriter()\n",
      "\n",
      "def export(name, nb):\n",
      "    \n",
      "    # Get a unique key for the notebook and set it in the resources object.\n",
      "    notebook_name = name[:name.rfind('.')]\n",
      "    resources = {}\n",
      "    resources['unique_key'] = notebook_name\n",
      "    resources['output_files_dir'] = '%s_files' % notebook_name\n",
      "\n",
      "    # Try to export\n",
      "    try:\n",
      "        output, resources = export_by_name(exporter_names.value, nb)\n",
      "    except ConversionException as e:\n",
      "        download_link.value = \"<br>Could not export notebook!\"\n",
      "    else:\n",
      "        write_results = file_writer.write(output, resources, notebook_name=notebook_name)\n",
      "    \n",
      "        download_link.value = \"<br>Results: <a href='files/{filename}'><i>\\\"{filename}\\\"</i></a>\".format(filename=write_results)\n",
      "        download_link.visible = True"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def handle_export():\n",
      "    with open(filename, 'r') as f:\n",
      "        export(filename, current.read(f, 'json'))\n",
      "export_button.on_click(handle_export)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 7
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "download_link.visible = False\n",
      "display(container)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 8
    }
   ],
   "metadata": {}
  }
 ]
}