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# coding: utf-8
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"""Utilities for installing Javascript extensions for the notebook"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import print_function
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import os
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import shutil
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import tarfile
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import zipfile
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from os.path import basename, join as pjoin
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# Deferred imports
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try:
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from urllib.parse import urlparse # Py3
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from urllib.request import urlretrieve
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except ImportError:
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from urlparse import urlparse
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from urllib import urlretrieve
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from IPython.utils.path import get_ipython_dir, ensure_dir_exists
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from IPython.utils.py3compat import string_types, cast_unicode_py2
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from IPython.utils.tempdir import TemporaryDirectory
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def _should_copy(src, dest, verbose=1):
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"""should a file be copied?"""
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if not os.path.exists(dest):
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return True
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if os.stat(dest).st_mtime < os.stat(src).st_mtime:
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if verbose >= 2:
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print("%s is out of date" % dest)
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return True
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if verbose >= 2:
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print("%s is up to date" % dest)
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return False
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def _maybe_copy(src, dest, verbose=1):
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"""copy a file if it needs updating"""
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if _should_copy(src, dest, verbose):
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if verbose >= 1:
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print("copying %s -> %s" % (src, dest))
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shutil.copy2(src, dest)
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def _safe_is_tarfile(path):
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"""safe version of is_tarfile, return False on IOError"""
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try:
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return tarfile.is_tarfile(path)
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except IOError:
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return False
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def check_nbextension(files, ipython_dir=None):
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"""Check whether nbextension files have been installed
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files should be a list of relative paths within nbextensions.
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Returns True if all files are found, False if any are missing.
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"""
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ipython_dir = ipython_dir or get_ipython_dir()
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nbext = pjoin(ipython_dir, u'nbextensions')
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# make sure nbextensions dir exists
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if not os.path.exists(nbext):
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return False
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if isinstance(files, string_types):
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# one file given, turn it into a list
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files = [files]
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return all(os.path.exists(pjoin(nbext, f)) for f in files)
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def install_nbextension(files, overwrite=False, symlink=False, ipython_dir=None, verbose=1):
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"""Install a Javascript extension for the notebook
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Stages files and/or directories into IPYTHONDIR/nbextensions.
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By default, this compares modification time, and only stages files that need updating.
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If `overwrite` is specified, matching files are purged before proceeding.
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Parameters
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----------
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files : list(paths or URLs)
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One or more paths or URLs to existing files directories to install.
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These will be installed with their base name, so '/path/to/foo'
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will install to 'nbextensions/foo'.
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Archives (zip or tarballs) will be extracted into the nbextensions directory.
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overwrite : bool [default: False]
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If True, always install the files, regardless of what may already be installed.
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symlink : bool [default: False]
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If True, create a symlink in nbextensions, rather than copying files.
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Not allowed with URLs or archives. Windows support for symlinks requires
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Vista or above, Python 3, and a permission bit which only admin users
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have by default, so don't rely on it.
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ipython_dir : str [optional]
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The path to an IPython directory, if the default value is not desired.
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get_ipython_dir() is used by default.
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verbose : int [default: 1]
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Set verbosity level. The default is 1, where file actions are printed.
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set verbose=2 for more output, or verbose=0 for silence.
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"""
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ipython_dir = ipython_dir or get_ipython_dir()
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nbext = pjoin(ipython_dir, u'nbextensions')
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# make sure nbextensions dir exists
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ensure_dir_exists(nbext)
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if isinstance(files, string_types):
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# one file given, turn it into a list
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files = [files]
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for path in map(cast_unicode_py2, files):
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if path.startswith(('https://', 'http://')):
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if symlink:
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raise ValueError("Cannot symlink from URLs")
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# Given a URL, download it
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with TemporaryDirectory() as td:
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filename = urlparse(path).path.split('/')[-1]
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local_path = os.path.join(td, filename)
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if verbose >= 1:
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print("downloading %s to %s" % (path, local_path))
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urlretrieve(path, local_path)
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# now install from the local copy
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install_nbextension(local_path, overwrite, symlink, ipython_dir, verbose)
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continue
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# handle archives
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archive = None
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if path.endswith('.zip'):
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archive = zipfile.ZipFile(path)
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elif _safe_is_tarfile(path):
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archive = tarfile.open(path)
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if archive:
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if symlink:
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raise ValueError("Cannot symlink from archives")
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if verbose >= 1:
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print("extracting %s to %s" % (path, nbext))
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archive.extractall(nbext)
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archive.close()
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continue
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dest = pjoin(nbext, basename(path))
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if overwrite and os.path.exists(dest):
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if verbose >= 1:
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print("removing %s" % dest)
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if os.path.isdir(dest) and not os.path.islink(dest):
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shutil.rmtree(dest)
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else:
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os.remove(dest)
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if symlink:
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path = os.path.abspath(path)
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if not os.path.exists(dest):
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if verbose >= 1:
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print("symlink %s -> %s" % (dest, path))
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os.symlink(path, dest)
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continue
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if os.path.isdir(path):
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strip_prefix_len = len(path) - len(basename(path))
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for parent, dirs, files in os.walk(path):
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dest_dir = pjoin(nbext, parent[strip_prefix_len:])
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if not os.path.exists(dest_dir):
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if verbose >= 2:
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print("making directory %s" % dest_dir)
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os.makedirs(dest_dir)
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for file in files:
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src = pjoin(parent, file)
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# print("%r, %r" % (dest_dir, file))
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dest = pjoin(dest_dir, file)
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_maybe_copy(src, dest, verbose)
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else:
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src = path
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_maybe_copy(src, dest, verbose)
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#----------------------------------------------------------------------
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# install nbextension app
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#----------------------------------------------------------------------
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from IPython.utils.traitlets import Bool, Enum
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from IPython.core.application import BaseIPythonApplication
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flags = {
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"overwrite" : ({
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"NBExtensionApp" : {
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"overwrite" : True,
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}}, "Force overwrite of existing files"
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),
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"debug" : ({
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"NBExtensionApp" : {
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"verbose" : 2,
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}}, "Extra output"
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),
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"quiet" : ({
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"NBExtensionApp" : {
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"verbose" : 0,
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}}, "Minimal output"
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),
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"symlink" : ({
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"NBExtensionApp" : {
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"symlink" : True,
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}}, "Create symlinks instead of copying files"
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),
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}
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flags['s'] = flags['symlink']
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aliases = {
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"ipython-dir" : "NBExtensionApp.ipython_dir"
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}
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class NBExtensionApp(BaseIPythonApplication):
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"""Entry point for installing notebook extensions"""
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description = """Install IPython notebook extensions
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Usage
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ipython install-nbextension file [more files, folders, archives or urls]
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This copies files and/or folders into the IPython nbextensions directory.
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If a URL is given, it will be downloaded.
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If an archive is given, it will be extracted into nbextensions.
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If the requested files are already up to date, no action is taken
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unless --overwrite is specified.
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"""
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examples = """
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ipython install-nbextension /path/to/d3.js /path/to/myextension
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"""
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aliases = aliases
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flags = flags
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overwrite = Bool(False, config=True, help="Force overwrite of existing files")
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symlink = Bool(False, config=True, help="Create symlinks instead of copying files")
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verbose = Enum((0,1,2), default_value=1, config=True,
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help="Verbosity level"
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)
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def install_extensions(self):
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install_nbextension(self.extra_args,
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overwrite=self.overwrite,
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symlink=self.symlink,
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verbose=self.verbose,
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ipython_dir=self.ipython_dir,
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)
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def start(self):
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if not self.extra_args:
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nbext = pjoin(self.ipython_dir, u'nbextensions')
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print("Notebook extensions in %s:" % nbext)
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for ext in os.listdir(nbext):
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print(u" %s" % ext)
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else:
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self.install_extensions()
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if __name__ == '__main__':
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NBExtensionApp.launch_instance()
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