Created
January 12, 2015 18:18
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| import Control.Monad | |
| import Data.Maybe | |
| import Text.Printf | |
| import qualified Data.DateTime as DT | |
| data Interval = Interval { start :: DT.DateTime | |
| , end :: DT.DateTime } | |
| deriving (Show) | |
| -- TODO: this shouldn't exist | |
| dayToInt :: DT.DateTime -> Int | |
| dayToInt day = d where (y, m, d, _, _, _) = DT.toGregorian day | |
| days :: Interval -> [DT.DateTime] | |
| days inv = map (DT.fromGregorian' sy sm) range | |
| where (sy, sm, sd, _, _, _) = DT.toGregorian (start inv) | |
| ed = dayToInt (end inv) | |
| range = [sd..ed] | |
| intakeBase = "/Users/andrew/code/hsandbox/events" | |
| buildFilename :: Int -> String | |
| buildFilename d = printf (intakeBase ++ "/%d.json") d | |
| filesForInterval :: Interval -> [String] | |
| filesForInterval inv = map buildFilename dayNums | |
| where dayNums = map dayToInt (days inv) | |
| -- Main.hs:33:28: | |
| -- Couldn't match type ‘IO’ with ‘Maybe’ | |
| -- Expected type: Maybe String | |
| -- Actual type: IO String | |
| -- In a stmt of a 'do' block: content <- readFile f | |
| -- In the expression: | |
| -- do { content <- readFile f; | |
| -- return $ Just (lines content) } | |
| -- | |
| -- Main.hs:34:17: | |
| -- Couldn't match type ‘Maybe [String]’ with ‘[String]’ | |
| -- Expected type: Maybe [String] | |
| -- Actual type: Maybe (Maybe [String]) | |
| -- In a stmt of a 'do' block: return $ Just (lines content) | |
| -- In the expression: | |
| -- do { content <- readFile f; | |
| -- return $ Just (lines content) } | |
| -- In an equation for ‘parseFile’: | |
| -- parseFile f | |
| -- = do { content <- readFile f; | |
| -- return $ Just (lines content) } | |
| -- Failed, modules loaded: none. | |
| parseFile :: String -> Maybe [String] | |
| parseFile f = do | |
| content <- readFile f | |
| return $ Just (lines content) | |
| main :: IO () | |
| main = do | |
| let start = DT.fromGregorian' 2014 12 16 | |
| end = DT.fromGregorian' 2014 12 20 | |
| print $ filesForInterval $ Interval start end |
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