added preferred-content log, and allow editing it with vicfg
This includes a full parser for the boolean expressions in the log, that compiles them into Matchers. Those matchers are not used yet. A complication is that matching against an expression should never crash git-annex with an error. Instead, vicfg checks that the expressions parse. If a bad expression (or an expression understood by some future git-annex version) gets into the log, it'll be ignored. Most of the code in Limit couldn't fail anyway, but I did have to make limitCopies check its parameter first, and return an error if it's bad, rather than erroring at runtime.
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@ -42,11 +42,15 @@ firstLine = takeWhile (/= '\n')
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{- Splits a list into segments that are delimited by items matching
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- a predicate. (The delimiters are not included in the segments.) -}
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segment :: (a -> Bool) -> [a] -> [[a]]
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segment p l = map reverse $ go [] [] l
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segment p = filter (not . all p) . segmentDelim p
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{- Includes the delimiters as segments of their own. -}
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segmentDelim :: (a -> Bool) -> [a] -> [[a]]
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segmentDelim p l = map reverse $ go [] [] l
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where
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go c r [] = reverse $ c:r
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go c r (i:is)
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| p i = go [] (c:r) is
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| p i = go [] ([i]:c:r) is
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| otherwise = go (i:c) r is
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{- Given two orderings, returns the second if the first is EQ and returns
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