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Rewrote 'newer_pairwise(): more natural (and incompatible) interface,

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simpler implementation.
This commit is contained in:
Greg Ward 2000-03-06 03:44:32 +00:00
parent 32c4a8a0ee
commit 9552665436
1 changed files with 13 additions and 12 deletions
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25
Lib/distutils/util.py
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@ -100,22 +100,23 @@ def newer (source, target):
def newer_pairwise (sources, targets):
"""Walk two filename lists in parallel, testing if each 'target' is
up-to-date relative to its corresponding 'source'. If so, both
are deleted from their respective lists. Return a list of tuples
containing the deleted (source,target) pairs."""
"""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"
goners = []
for i in range (len (sources)-1, -1, -1):
if not newer (sources[i], targets[i]):
goners.append ((sources[i], targets[i]))
del sources[i]
del targets[i]
goners.reverse()
return goners
# 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 ()