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note potentially useful interval algebra link

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Simon Michael 2014-04-19 11:45:47 -07:00
parent d0461c3ef7
commit 6af5e6fe06
1 changed files with 2 additions and 0 deletions
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hledger-lib/Hledger/Data/Dates.hs
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@ -119,6 +119,8 @@ spanStart (DateSpan d _) = d
spanEnd :: DateSpan -> Maybe Day
spanEnd (DateSpan _ d) = d
-- might be useful later: http://en.wikipedia.org/wiki/Allen%27s_interval_algebra
-- | Get overall span enclosing multiple sequentially ordered spans.
spansSpan :: [DateSpan] -> DateSpan
spansSpan spans = DateSpan (maybe Nothing spanStart $ headMay spans) (maybe Nothing spanEnd $ lastMay spans)