# -*- coding: utf-8 -*-
"""
Functions for working with filesystem paths.
The :func:`expandpath` function expands the tilde to $HOME and environment
variables to their values.
The :func:`augpath` function creates variants of an existing path without
having to spend multiple lines of code splitting it up and stitching it back
together.
The :func:`shrinkuser` function replaces your home directory with a tilde.
The :func:`userhome` function reports the home directory of the current user of
the operating system.
The :func:`ensuredir` function operates like ``mkdir -p`` in unix.
"""
from __future__ import absolute_import, division, print_function, unicode_literals
from os.path import dirname
from os.path import exists
from os.path import expanduser
from os.path import expandvars
from os.path import join
from os.path import normpath
from os.path import split
from os.path import splitext
import os
import sys
__all__ = [
'TempDir', 'augpath', 'shrinkuser', 'userhome', 'ensuredir', 'expandpath',
]
[docs]def augpath(path, suffix='', prefix='', ext=None, base=None, dpath=None,
multidot=False):
"""
Create a new path with a different extension, basename, directory, prefix,
and/or suffix.
A prefix is inserted before the basename. A suffix is inserted
between the basename and the extension. The basename and extension can be
replaced with a new one. Essentially a path is broken down into components
(dpath, base, ext), and then recombined as (dpath, prefix, base, suffix,
ext) after replacing any specified component.
Args:
path (str | PathLike): a path to augment
suffix (str, default=''): placed between the basename and extension
prefix (str, default=''): placed in front of the basename
ext (str, default=None): if specified, replaces the extension
base (str, default=None): if specified, replaces the basename without
extension
dpath (str | PathLike, default=None): if specified, replaces the directory
multidot (bool, default=False): Allows extensions to contain multiple
dots. Specifically, if False, everything after the last dot in the
basename is the extension. If True, everything after the first dot
in the basename is the extension.
Returns:
str: augmented path
Example:
>>> import ubelt as ub
>>> path = 'foo.bar'
>>> suffix = '_suff'
>>> prefix = 'pref_'
>>> ext = '.baz'
>>> newpath = ub.augpath(path, suffix, prefix, ext=ext, base='bar')
>>> print('newpath = %s' % (newpath,))
newpath = pref_bar_suff.baz
Example:
>>> augpath('foo.bar')
'foo.bar'
>>> augpath('foo.bar', ext='.BAZ')
'foo.BAZ'
>>> augpath('foo.bar', suffix='_')
'foo_.bar'
>>> augpath('foo.bar', prefix='_')
'_foo.bar'
>>> augpath('foo.bar', base='baz')
'baz.bar'
>>> augpath('foo.tar.gz', ext='.zip', multidot=True)
foo.zip
>>> augpath('foo.tar.gz', ext='.zip', multidot=False)
foo.tar.zip
>>> augpath('foo.tar.gz', suffix='_new', multidot=True)
foo_new.tar.gz
"""
# Breakup path
orig_dpath, fname = split(path)
if multidot:
# The first dot defines the extension
parts = fname.split('.', 1)
orig_base = parts[0]
orig_ext = '' if len(parts) == 1 else '.' + parts[1]
else:
# The last dot defines the extension
orig_base, orig_ext = splitext(fname)
# Replace parts with specified augmentations
if dpath is None:
dpath = orig_dpath
if ext is None:
ext = orig_ext
if base is None:
base = orig_base
# Recombine into new path
new_fname = ''.join((prefix, base, suffix, ext))
newpath = join(dpath, new_fname)
return newpath
[docs]def userhome(username=None):
"""
Returns the path to some user's home directory.
Args:
username (str, default=None): name of a user on the system. If not
specified, the current user is inferred.
Returns:
str: userhome_dpath: path to the specified home directory
Raises:
KeyError: if the specified user does not exist on the system
OSError: if username is unspecified and the current user cannot be
inferred
Example:
>>> import getpass
>>> username = getpass.getuser()
>>> assert userhome() == expanduser('~')
>>> assert userhome(username) == expanduser('~')
"""
if username is None:
# get home directory for the current user
if 'HOME' in os.environ:
userhome_dpath = os.environ['HOME']
else: # nocover
if sys.platform.startswith('win32'):
# win32 fallback when HOME is not defined
if 'USERPROFILE' in os.environ:
userhome_dpath = os.environ['USERPROFILE']
elif 'HOMEPATH' in os.environ:
drive = os.environ.get('HOMEDRIVE', '')
userhome_dpath = join(drive, os.environ['HOMEPATH'])
else:
raise OSError("Cannot determine the user's home directory")
else:
# posix fallback when HOME is not defined
import pwd
userhome_dpath = pwd.getpwuid(os.getuid()).pw_dir
else:
# A specific user directory was requested
if sys.platform.startswith('win32'): # nocover
# get the directory name for the current user
c_users = dirname(userhome())
userhome_dpath = join(c_users, username)
if not exists(userhome_dpath):
raise KeyError('Unknown user: {}'.format(username))
else:
import pwd
try:
pwent = pwd.getpwnam(username)
except KeyError: # nocover
raise KeyError('Unknown user: {}'.format(username))
userhome_dpath = pwent.pw_dir
return userhome_dpath
[docs]def shrinkuser(path, home='~'):
"""
Inverse of :func:`os.path.expanduser`.
Args:
path (str | PathLike): path in system file structure
home (str, default='~'): symbol used to replace the home path.
Defaults to '~', but you might want to use '$HOME' or
'%USERPROFILE%' instead.
Returns:
str: path: shortened path replacing the home directory with a tilde
Example:
>>> path = expanduser('~')
>>> assert path != '~'
>>> assert shrinkuser(path) == '~'
>>> assert shrinkuser(path + '1') == path + '1'
>>> assert shrinkuser(path + '/1') == join('~', '1')
>>> assert shrinkuser(path + '/1', '$HOME') == join('$HOME', '1')
>>> assert shrinkuser('.') == '.'
"""
path = normpath(path)
userhome_dpath = userhome()
if path.startswith(userhome_dpath):
if len(path) == len(userhome_dpath):
path = home
elif path[len(userhome_dpath)] == os.path.sep:
path = home + path[len(userhome_dpath):]
return path
[docs]def expandpath(path):
"""
Shell-like environment variable and tilde path expansion.
Less aggressive than truepath. Only expands environs and tilde. Does not
change relative paths to absolute paths.
Args:
path (str | PathLike): string representation of a path
Returns:
str : expanded path
Example:
>>> import ubelt as ub
>>> assert normpath(ub.expandpath('~/foo')) == join(ub.userhome(), 'foo')
>>> assert ub.expandpath('foo') == 'foo'
"""
path = expanduser(path)
path = expandvars(path)
return path
[docs]def ensuredir(dpath, mode=0o1777, verbose=None, recreate=False):
r"""
Ensures that directory will exist. Creates new dir with sticky bits by
default
Args:
dpath (str | PathLike | Tuple[str | PathLike]): dir to ensure. Can also
be a tuple to send to join
mode (int, default=0o1777): octal mode of directory
verbose (int, default=0): verbosity
recreate (bool, default=False): if True removes the directory and
all of its contents and creates a fresh new directory.
USE CAREFULLY.
Returns:
str: path: the ensured directory
Notes:
This function is not thread-safe in Python2
Example:
>>> from ubelt.util_platform import * # NOQA
>>> import ubelt as ub
>>> cache_dpath = ub.ensure_app_cache_dir('ubelt')
>>> dpath = join(cache_dpath, 'ensuredir')
>>> if exists(dpath):
... os.rmdir(dpath)
>>> assert not exists(dpath)
>>> ub.ensuredir(dpath)
>>> assert exists(dpath)
>>> os.rmdir(dpath)
"""
if verbose is None:
verbose = 0
if isinstance(dpath, (list, tuple)):
dpath = join(*dpath)
if recreate:
import ubelt as ub
ub.delete(dpath, verbose=verbose)
if not exists(dpath):
if verbose:
print('Ensuring directory (creating {!r})'.format(dpath))
if sys.version_info.major == 2: # nocover
os.makedirs(normpath(dpath), mode=mode)
else:
os.makedirs(normpath(dpath), mode=mode, exist_ok=True)
else:
if verbose:
print('Ensuring directory (existing {!r})'.format(dpath))
return dpath
[docs]class TempDir(object):
"""
Context for creating and cleaning up temporary directories.
Example:
>>> with TempDir() as self:
>>> dpath = self.dpath
>>> assert exists(dpath)
>>> assert not exists(dpath)
Example:
>>> self = TempDir()
>>> dpath = self.ensure()
>>> assert exists(dpath)
>>> self.cleanup()
>>> assert not exists(dpath)
"""
def __init__(self):
self.dpath = None
def __del__(self):
self.cleanup()
[docs] def ensure(self):
import tempfile
if not self.dpath:
self.dpath = tempfile.mkdtemp()
return self.dpath
[docs] def cleanup(self):
if self.dpath:
import shutil
shutil.rmtree(self.dpath)
self.dpath = None
[docs] def start(self):
self.ensure()
return self
def __enter__(self):
return self.start()
def __exit__(self, type_, value, trace):
self.cleanup()