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      """distutils.dir_util

Utility functions for manipulating directories and directory trees."""

__revision__ = "$Id$"

import os
import errno
from distutils.errors import DistutilsFileError, DistutilsInternalError
from distutils import log

# cache for by mkpath() -- in addition to cheapening redundant calls,
# eliminates redundant "creating /foo/bar/baz" messages in dry-run mode
_path_created = {}

# I don't use os.makedirs because a) it's new to Python 1.5.2, and
# b) it blows up if the directory already exists (I want to silently
# succeed in that case).
def mkpath(name, mode=0777, verbose=1, dry_run=0):
    """Create a directory and any missing ancestor directories.

    If the directory already exists (or if 'name' is the empty string, which
    means the current directory, which of course exists), then do nothing.
    Raise DistutilsFileError if unable to create some directory along the way
    (eg. some sub-path exists, but is a file rather than a directory).
    If 'verbose' is true, print a one-line summary of each mkdir to stdout.
    Return the list of directories actually created.
    """

    global _path_created

    # Detect a common bug -- name is None
    if not isinstance(name, basestring):
        raise DistutilsInternalError, \
              "mkpath: 'name' must be a string (got %r)" % (name,)

    # XXX what's the better way to handle verbosity? print as we create
    # each directory in the path (the current behaviour), or only announce
    # the creation of the whole path? (quite easy to do the latter since
    # we're not using a recursive algorithm)

    name = os.path.normpath(name)
    created_dirs = []
    if os.path.isdir(name) or name == '':
        return created_dirs
    if _path_created.get(os.path.abspath(name)):
        return created_dirs

    (head, tail) = os.path.split(name)
    tails = [tail]                      # stack of lone dirs to create

    while head and tail and not os.path.isdir(head):
        (head, tail) = os.path.split(head)
        tails.insert(0, tail)          # push next higher dir onto stack

    # now 'head' contains the deepest directory that already exists
    # (that is, the child of 'head' in 'name' is the highest directory
    # that does *not* exist)
    for d in tails:
        #print "head = %s, d = %s: " % (head, d),
        head = os.path.join(head, d)
        abs_head = os.path.abspath(head)

        if _path_created.get(abs_head):
            continue

        if verbose >= 1:
            log.info("creating %s", head)

        if not dry_run:
            try:
                os.mkdir(head, mode)
            except OSError, exc:
                if not (exc.errno == errno.EEXIST and os.path.isdir(head)):
                    raise DistutilsFileError(
                          "could not create '%s': %s" % (head, exc.args[-1]))
            created_dirs.append(head)

        _path_created[abs_head] = 1
    return created_dirs

def create_tree(base_dir, files, mode=0777, verbose=1, dry_run=0):
    """Create all the empty directories under 'base_dir' needed to put 'files'
    there.

    'base_dir' is just the a name of a directory which doesn't necessarily
    exist yet; 'files' is a list of filenames to be interpreted relative to
    'base_dir'.  'base_dir' + the directory portion of every file in 'files'
    will be created if it doesn't already exist.  'mode', 'verbose' and
    'dry_run' flags are as for 'mkpath()'.
    """
    # First get the list of directories to create
    need_dir = {}
    for file in files:
        need_dir[os.path.join(base_dir, os.path.dirname(file))] = 1
    need_dirs = need_dir.keys()
    need_dirs.sort()

    # Now create them
    for dir in need_dirs:
        mkpath(dir, mode, verbose=verbose, dry_run=dry_run)

def copy_tree(src, dst, preserve_mode=1, preserve_times=1,
              preserve_symlinks=0, update=0, verbose=1, dry_run=0):
    """Copy an entire directory tree 'src' to a new location 'dst'.

    Both 'src' and 'dst' must be directory names.  If 'src' is not a
    directory, raise DistutilsFileError.  If