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sµ Cache lines from files.
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h a d S( s Clear the cache entirely.N( t cache( ( ( R R s c C s+ | t j o t | d Sn t | Sd S( ss Get the lines for a file from the cache.
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j o t | =qB qB Wd S( sU Discard cache entries that are out of date.
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} g Sn X| i | i } } | | | | f t | <| S( s Update a cache entry and return its list of lines.
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and return an empty list.i i˙˙˙˙s <>i t rUN( R R
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