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Utility functions for simple, timestamp-based dependency of files
and groups of files; also, function based entirely on such
timestamp dependency analysis. N)DistutilsFileErrorc ` t j | s/t dt j | z t j | sdS ddlm} t j | | }t j | | }||k S )a 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.
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&F F? c R t | t | k rt d g }g }t t | D ]T}t | | || r6| | | | || U||fS )zWalk two filename lists in parallel, testing if each source is newer
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'missing' controls what we do when a source file is missing; the
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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out-of-date (this is handy in "dry-run" mode: it'll make you pretend to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).
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