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haskell learning project (ongoing) - manage a timesheet in the shell
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module Main ( | |
main | |
) where | |
-- | REF für Data Time https://two-wrongs.com/haskell-time-library-tutorial | |
import Data.Time | |
import System.Directory (doesFileExist) | |
data Status = Start | End | Break deriving Show | |
data Entry = Entry Status ZonedTime deriving Show | |
timeSheetEntry :: Status -> IO Entry -- can I make this pointfree | |
timeSheetEntry st = do | |
nowHere <- getZonedTime | |
return $ Entry st nowHere | |
storeEntry :: Entry -> IO () | |
storeEntry (Entry s t) = do | |
fileExist <- doesFileExist "./timesheet" | |
case fileExist of | |
True -> appendFile "timesheet" entry | |
False -> writeFile "timesheet" firstentry | |
where | |
entry = show s ++ "," ++ show t ++ "\n" | |
firstentry = "status,timestamp\n" ++ show s ++ "," ++ show t ++ "\n" | |
data Person = Person | |
{ status :: !Status | |
, timestamp :: ! -- Zoned time | |
} | |
instance FromNamedRecord Person where | |
parseNamedRecord r = Person <$> r .: "name" <*> r .: "salary" | |
loadCsv :: IO () | |
main = do | |
csvData <- BL.readFile "salaries.csv" | |
case decodeByName csvData of | |
Left err -> putStrLn err | |
Right (_, v) -> V.forM_ v $ \ p -> | |
putStrLn $ name p ++ " earns " ++ show (salary p) ++ " dollars" | |
main :: IO () | |
main = do | |
currentWorkDateTime <- timeSheetEntry Start | |
putStrLn $ "Work Point: " ++ show currentWorkDateTime | |
storeEntry currentWorkDateTime |
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