Use link(2) when possible in nbconvert

IPython/nbconvert/writers/files.py

@@ -1,102 +1,102
 #!/usr/bin/env python
 """
 Contains writer for writing nbconvert output to filesystem.
 """
 #-----------------------------------------------------------------------------
 #Copyright (c) 2013, the 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
 #-----------------------------------------------------------------------------
 
 import io
 import os
-import shutil
 import glob
 
 from IPython.utils.traitlets import Unicode
+from IPython.utils.path import link_or_copy
 
 from .base import WriterBase
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 
 class FilesWriter(WriterBase):
     """Consumes nbconvert output and produces files."""
 
 
     build_directory = Unicode(".", config=True, 
                               help="""Directory to write output to.  Leave blank
                               to output to the current directory""")
 
 
     # Make sure that the output directory exists.
     def _build_directory_changed(self, name, old, new):
         if new and not os.path.isdir(new):
             os.makedirs(new)
 
 
     def __init__(self, **kw):
         super(FilesWriter, self).__init__(**kw)
         self._build_directory_changed('build_directory', self.build_directory, 
                                       self.build_directory)
 
 
     def write(self, output, resources, notebook_name=None, **kw):
             """
             Consume and write Jinja output to the file system.  Output directory
             is set via the 'build_directory' variable of this instance (a 
             configurable).
 
             See base for more...
             """
 
             # Pull the extension and subdir from the resources dict.
             output_extension = resources['output_extension']
 
             # Write all of the extracted resources to the destination directory.
             # NOTE: WE WRITE EVERYTHING AS-IF IT'S BINARY.  THE EXTRACT FIG
             # TRANSFORMER SHOULD HANDLE UNIX/WINDOWS LINE ENDINGS...
             for filename, data in resources.get('outputs', {}).items():
 
                 # Determine where to write the file to
                 dest = os.path.join(self.build_directory, filename)
                 path = os.path.dirname(dest)
                 if not os.path.isdir(path):
                     os.makedirs(path)
 
                 # Write file
                 with io.open(dest, 'wb') as f:
                     f.write(data)
 
             # Copy referenced files to output directory
             if self.build_directory:
                 for filename in self.files:
 
                     # Copy files that match search pattern
                     for matching_filename in glob.glob(filename):
 
                         # Make sure folder exists.
                         dest = os.path.join(self.build_directory, filename)
                         path = os.path.dirname(dest)
                         if not os.path.isdir(path):
                             os.makedirs(path)
 
                         # Copy if destination is different.
                         if not os.path.normpath(dest) == os.path.normpath(matching_filename):
-                            shutil.copyfile(matching_filename, dest)
+                            link_or_copy(matching_filename, dest)
 
             # Determine where to write conversion results.
             dest = notebook_name + '.' + output_extension
             if self.build_directory:
                 dest = os.path.join(self.build_directory, dest)
 
             # Write conversion results.
             with io.open(dest, 'w') as f:
                 f.write(output)