[Python-checkins] r76748 - in python/branches/py3k: Lib/distutils/dep_util.py Lib/distutils/tests/test_dep_util.py

[tarek.ziade]

Author: tarek.ziade
Date: Thu Dec 10 16:35:35 2009
New Revision: 76748

Log:
Merged revisions 76746 via svnmerge from 
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r76746 | tarek.ziade | 2009-12-10 16:29:03 +0100 (Thu, 10 Dec 2009) | 1 line
  
  added test coverage for distutils.dep_util, and cleaned up the module
........


Added:
   python/branches/py3k/Lib/distutils/tests/test_dep_util.py
      - copied unchanged from r76746, /python/trunk/Lib/distutils/tests/test_dep_util.py
Modified:
   python/branches/py3k/   (props changed)
   python/branches/py3k/Lib/distutils/dep_util.py

Modified: python/branches/py3k/Lib/distutils/dep_util.py
==============================================================================
--- python/branches/py3k/Lib/distutils/dep_util.py	(original)
+++ python/branches/py3k/Lib/distutils/dep_util.py	Thu Dec 10 16:35:35 2009
@@ -9,29 +9,27 @@
 import os
 from distutils.errors import DistutilsFileError
 
+def newer(source, target):
+    """Tells if the target is newer than the source.
 
-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.
+    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.
+
+    Note that this test is not very accurate: files created in the same second
+    will have the same "age".
     """
     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 ()
+        return True
 
+    return os.stat(source).st_mtime > os.stat(target).st_mtime
 
-def newer_pairwise (sources, targets):
+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
@@ -43,19 +41,18 @@
     # 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])
+    for source, target in zip(sources, targets):
+        if newer(source, target):
+            n_sources.append(source)
+            n_targets.append(target)
 
-    return (n_sources, n_targets)
+    return n_sources, n_targets
 
-# newer_pairwise ()
-
-
-def newer_group (sources, target, missing='error'):
+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
+    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()';
@@ -68,14 +65,14 @@
     """
     # If the target doesn't even exist, then it's definitely out-of-date.
     if not os.path.exists(target):
-        return 1
+        return True
 
     # 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]
+    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
@@ -83,12 +80,9 @@
             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
+                return True             #  out-of-date
 
-        source_mtime = os.stat(source)[ST_MTIME]
-        if source_mtime > target_mtime:
-            return 1
-    else:
-        return 0
+        if os.stat(source).st_mtime > target_mtime:
+            return True
 
-# newer_group ()
+    return False