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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">&quot;&quot;&quot;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.&quot;&quot;&quot;

import os
from distutils.errors import DistutilsFileError


def newer (source, target):
    &quot;&quot;&quot;Return true if &#039;source&#039; exists and is more recently modified than
    &#039;target&#039;, or if &#039;source&#039; exists and &#039;target&#039; doesn&#039;t.  Return false if
    both exist and &#039;target&#039; is the same age or younger than &#039;source&#039;.
    Raise DistutilsFileError if &#039;source&#039; does not exist.
    &quot;&quot;&quot;
    if not os.path.exists(source):
        raise DistutilsFileError(&quot;file &#039;%s&#039; does not exist&quot; %
                                 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 &gt; mtime2

# newer ()


def newer_pairwise (sources, targets):
    &quot;&quot;&quot;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 &#039;newer()&#039;.
    &quot;&quot;&quot;
    if len(sources) != len(targets):
        raise ValueError(&quot;&#039;sources&#039; and &#039;targets&#039; must be same length&quot;)

    # 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=&#039;error&#039;):
    &quot;&quot;&quot;Return true if &#039;target&#039; is out-of-date with respect to any file
    listed in &#039;sources&#039;.  In other words, if &#039;target&#039; exists and is newer
    than every file in &#039;sources&#039;, return false; otherwise return true.
    &#039;missing&#039; controls what we do when a source file is missing; the
    default (&quot;error&quot;) is to blow up with an OSError from inside &#039;stat()&#039;;
    if it is &quot;ignore&quot;, we silently drop any missing source files; if it is
    &quot;newer&quot;, any missing source files make us assume that &#039;target&#039; is
    out-of-date (this is handy in &quot;dry-run&quot; mode: it&#039;ll make you pretend to
    carry out commands that wouldn&#039;t work because inputs are missing, but
    that doesn&#039;t matter because you&#039;re not actually going to run the
    commands).
    &quot;&quot;&quot;
    # If the target doesn&#039;t even exist, then it&#039;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 &#039;target&#039;, then &#039;target&#039; is out-of-date and
    # we can immediately return true.  If we fall through to the end
    # of the loop, then &#039;target&#039; 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 == &#039;error&#039;:      # blow up when we stat() the file
                pass
            elif missing == &#039;ignore&#039;:   # missing source dropped from
                continue                #  target&#039;s dependency list
            elif missing == &#039;newer&#039;:    # missing source means target is
                return 1                #  out-of-date

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

# newer_group ()
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