nbconvert --to script

Use extension and mime type from NB metadata

IPython/nbconvert/exporters/script.py

@@ -0,0 +1,14 b''
+"""Generic script exporter class for any kernel language"""
+
+from .templateexporter import TemplateExporter
+
+class ScriptExporter(TemplateExporter):
+    def _template_file_default(self):
+        return 'script'
+
+    def from_notebook_node(self, nb, resources=None, **kw):
+        langinfo = nb.metadata.get('language_info', {})
+        self.file_extension = langinfo.get('file_extension', 'txt')
+        self.output_mimetype = langinfo.get('mimetype', 'text/plain')
+
+        return super(ScriptExporter, self).from_notebook_node(nb, resources, **kw)

IPython/nbconvert/templates/script.tpl

@@ -0,0 +1,5 b''
+{%- extends 'null.tpl' -%}
+
+{% block input %}
+{{ cell.source }}
+{% endblock input %}

IPython/nbconvert/exporters/export.py

@@ -1,174 +1,177 b''
 """Module containing single call export functions."""
 
 # Copyright (c) IPython Development Team.
 # Distributed under the terms of the Modified BSD License.
 
 from functools import wraps
 
 from IPython.nbformat import NotebookNode
 from IPython.utils.decorators import undoc
 from IPython.utils.py3compat import string_types
 
 from .exporter import Exporter
 from .templateexporter import TemplateExporter
 from .html import HTMLExporter
 from .slides import SlidesExporter
 from .latex import LatexExporter
 from .pdf import PDFExporter
 from .markdown import MarkdownExporter
 from .python import PythonExporter
 from .rst import RSTExporter
 from .notebook import NotebookExporter
+from .script import ScriptExporter
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 @undoc
 def DocDecorator(f):
     
     #Set docstring of function
     f.__doc__ = f.__doc__ + """
     nb : :class:`~IPython.nbformat.NotebookNode`
       The notebook to export.
     config : config (optional, keyword arg)
         User configuration instance.
     resources : dict (optional, keyword arg)
         Resources used in the conversion process.
         
     Returns
     -------
     tuple- output, resources, exporter_instance
     output : str
         Jinja 2 output.  This is the resulting converted notebook.
     resources : dictionary
         Dictionary of resources used prior to and during the conversion 
         process.
     exporter_instance : Exporter
         Instance of the Exporter class used to export the document.  Useful
         to caller because it provides a 'file_extension' property which
         specifies what extension the output should be saved as.
 
     Notes
     -----
     WARNING: API WILL CHANGE IN FUTURE RELEASES OF NBCONVERT
     """
             
     @wraps(f)
     def decorator(*args, **kwargs):
         return f(*args, **kwargs)
     
     return decorator
 
 
 #-----------------------------------------------------------------------------
 # Functions
 #-----------------------------------------------------------------------------
 
 __all__ = [
     'export',
     'export_html',
     'export_custom',
     'export_slides',
     'export_latex',
     'export_pdf',
     'export_markdown',
     'export_python',
+    'export_script',
     'export_rst',
     'export_by_name',
     'get_export_names',
     'ExporterNameError'
 ]
 
 
 class ExporterNameError(NameError):
     pass
 
 @DocDecorator
 def export(exporter, nb, **kw):
     """
     Export a notebook object using specific exporter class.
     
     Parameters
     ----------
     exporter : class:`~IPython.nbconvert.exporters.exporter.Exporter` class or instance
       Class type or instance of the exporter that should be used.  If the
       method initializes it's own instance of the class, it is ASSUMED that
       the class type provided exposes a constructor (``__init__``) with the same
       signature as the base Exporter class.
     """
     
     #Check arguments
     if exporter is None:
         raise TypeError("Exporter is None")
     elif not isinstance(exporter, Exporter) and not issubclass(exporter, Exporter):
         raise TypeError("exporter does not inherit from Exporter (base)")
     if nb is None:
         raise TypeError("nb is None")
     
     #Create the exporter
     resources = kw.pop('resources', None)
     if isinstance(exporter, Exporter):
         exporter_instance = exporter
     else:
         exporter_instance = exporter(**kw)
     
     #Try to convert the notebook using the appropriate conversion function.
     if isinstance(nb, NotebookNode):
         output, resources = exporter_instance.from_notebook_node(nb, resources)
     elif isinstance(nb, string_types):
         output, resources = exporter_instance.from_filename(nb, resources)
     else:
         output, resources = exporter_instance.from_file(nb, resources)
     return output, resources
 
 exporter_map = dict(
     custom=TemplateExporter,
     html=HTMLExporter,
     slides=SlidesExporter,
     latex=LatexExporter,
     pdf=PDFExporter,
     markdown=MarkdownExporter,
     python=PythonExporter,
     rst=RSTExporter,
     notebook=NotebookExporter,
+    script=ScriptExporter,
 )
 
 def _make_exporter(name, E):
     """make an export_foo function from a short key and Exporter class E"""
     def _export(nb, **kw):
         return export(E, nb, **kw)
     _export.__doc__ = """Export a notebook object to {0} format""".format(name)
     return _export
     
 g = globals()
 
 for name, E in exporter_map.items():
     g['export_%s' % name] = DocDecorator(_make_exporter(name, E))
 
 @DocDecorator
 def export_by_name(format_name, nb, **kw):
     """
     Export a notebook object to a template type by its name.  Reflection
     (Inspect) is used to find the template's corresponding explicit export
     method defined in this module.  That method is then called directly.
     
     Parameters
     ----------
     format_name : str
         Name of the template style to export to.
     """
     
     function_name = "export_" + format_name.lower()
     
     if function_name in globals():
         return globals()[function_name](nb, **kw)
     else:
         raise ExporterNameError("template for `%s` not found" % function_name)
 
 
 def get_export_names():
     """Return a list of the currently supported export targets
 
     WARNING: API WILL CHANGE IN FUTURE RELEASES OF NBCONVERT"""
     return sorted(exporter_map.keys())