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File Content: `dep_util.py`

"""distutils.dep_util

Utility functions for simple, timestamp-based dependency of files
and groups of files; also, function based entirely on such
timestamp dependency analysis."""

import os
from distutils.errors import DistutilsFileError


def newer (source, target):
    """Return true if 'source' exists and is more recently modified than
    'target', or if 'source' exists and 'target' doesn't.  Return false if
    both exist and 'target' is the same age or younger than 'source'.
    Raise DistutilsFileError if 'source' does not exist.
    """
    if not os.path.exists(source):
        raise DistutilsFileError("file '%s' does not exist" %
                                 os.path.abspath(source))
    if not os.path.exists(target):
        return 1

    from stat import ST_MTIME
    mtime1 = os.stat(source)[ST_MTIME]
    mtime2 = os.stat(target)[ST_MTIME]

    return mtime1 > mtime2

# newer ()


def newer_pairwise (sources, targets):
    """Walk two filename lists in parallel, testing if each source is newer
    than its corresponding target.  Return a pair of lists (sources,
    targets) where source is newer than target, according to the semantics
    of 'newer()'.
    """
    if len(sources) != len(targets):
        raise ValueError("'sources' and 'targets' must be same length")

    # build a pair of lists (sources, targets) where  source is newer
    n_sources = []
    n_targets = []
    for i in range(len(sources)):
        if newer(sources[i], targets[i]):
            n_sources.append(sources[i])
            n_targets.append(targets[i])

    return (n_sources, n_targets)

# newer_pairwise ()


def newer_group (sources, target, missing='error'):
    """Return true if 'target' is out-of-date with respect to any file
    listed in 'sources'.  In other words, if 'target' exists and is newer
    than every file in 'sources', return false; otherwise return true.
    'missing' controls what we do when a source file is missing; the
    default ("error") is to blow up with an OSError from inside 'stat()';
    if it is "ignore", we silently drop any missing source files; if it is
    "newer", any missing source files make us assume that 'target' is
    out-of-date (this is handy in "dry-run" mode: it'll make you pretend to
    carry out commands that wouldn't work because inputs are missing, but
    that doesn't matter because you're not actually going to run the
    commands).
    """
    # If the target doesn't even exist, then it's definitely out-of-date.
    if not os.path.exists(target):
        return 1

    # Otherwise we have to find out the hard way: if *any* source file
    # is more recent than 'target', then 'target' is out-of-date and
    # we can immediately return true.  If we fall through to the end
    # of the loop, then 'target' is up-to-date and we return false.
    from stat import ST_MTIME
    target_mtime = os.stat(target)[ST_MTIME]
    for source in sources:
        if not os.path.exists(source):
            if missing == 'error':      # blow up when we stat() the file
                pass
            elif missing == 'ignore':   # missing source dropped from
                continue                #  target's dependency list
            elif missing == 'newer':    # missing source means target is
                return 1                #  out-of-date

        source_mtime = os.stat(source)[ST_MTIME]
        if source_mtime > target_mtime:
            return 1
    else:
        return 0

# newer_group ()

Name	Size	Permission
__pycache__	---	0755
command	---	0755
README	242 bytes	0644
__init__.py	236 bytes	0644
_msvccompiler.py	20050 bytes	0644
archive_util.py	8572 bytes	0644
bcppcompiler.py	14935 bytes	0644
ccompiler.py	47433 bytes	0644
cmd.py	18079 bytes	0644
config.py	4827 bytes	0644
core.py	8876 bytes	0644
cygwinccompiler.py	16478 bytes	0644
debug.py	139 bytes	0644
dep_util.py	3491 bytes	0644
dir_util.py	7778 bytes	0644
dist.py	50385 bytes	0644
errors.py	3577 bytes	0644
extension.py	10515 bytes	0644
fancy_getopt.py	17784 bytes	0644
file_util.py	8148 bytes	0644
filelist.py	12832 bytes	0644
log.py	1969 bytes	0644
msvc9compiler.py	30511 bytes	0644
msvccompiler.py	23564 bytes	0644
spawn.py	7843 bytes	0644
sysconfig.py	20497 bytes	0644
text_file.py	12483 bytes	0644
unixccompiler.py	15254 bytes	0644
util.py	20892 bytes	0644
version.py	12345 bytes	0644
versionpredicate.py	5133 bytes	0644

File Content: dep_util.py

File Content: `dep_util.py`