Changeset 391 for python/trunk/Lib/distutils/dep_util.py

Timestamp:

Mar 19, 2014, 11:31:01 PM (11 years ago)

Author:

dmik

Message:

python: Merge vendor 2.7.6 to trunk.

Location:

python/trunk

Files:

• . (modified) (1 prop)
• Lib/distutils/dep_util.py (modified) (5 diffs)

python/trunk/Lib/distutils/dep_util.py

@@ -5 +5 @@
 timestamp dependency analysis."""
 
-# This module should be kept compatible with Python 2.1.
-
-__revision__ = "$Id: dep_util.py 58049 2007-09-08 00:34:17Z skip.montanaro $"
+__revision__ = "$Id$"
 
 import os
+from stat import ST_MTIME
 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))
+        raise DistutilsFileError("file '%s' does not exist" %
+                                 os.path.abspath(source))
     if not os.path.exists(target):
-        return 1
+        return True
 
-    from stat import ST_MTIME
-    mtime1 = os.stat(source)[ST_MTIME]
-    mtime2 = os.stat(target)[ST_MTIME]
+    return os.stat(source)[ST_MTIME] > os.stat(target)[ST_MTIME]
 
-    return mtime1 > mtime2
-
-# newer ()
-
-
-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,
@@ -46 +43 @@
     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'):
+    """Return true if 'target' is out-of-date with respect to any file
+    listed in 'sources'.
 
-
-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
+    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
@@ -71 +67 @@
     # 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
@@ -77 +73 @@
     # 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):
@@ -86 +82 @@
                 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