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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 C s` t j�| �s tdt j�| � ��t j�|�s0dS ddlm} t �| �| }t �|�| }||kS )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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�r c C sh t | �t |�krtd��g }g }tt | ��D ]2}t| | || �r,|�| | � |�|| � q,||fS )z�Walk 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
default ("error") is to blow up with an OSError from inside 'stat()';
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out-of-date (this is handy in "dry-run" mode: it'll make you pretend to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
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